JP4332851B2 - Multi-tube once-through boiler - Google Patents

Description

  The present invention relates to a multi-tube once-through boiler apparatus, and more particularly to a multi-tube multi-flow boiler apparatus.

  In a multi-tube once-through boiler that heats the water tube group, when the water tube is heated from the side, the heat load varies depending on the distance from the burner, and the boiler water is lifted in the water tube close to the burner, and the boiler water is taken out together with the steam. The so-called carry-over phenomenon occurs, so that the water level in the water pipe cannot be raised sufficiently. The carry-over phenomenon may occur when the boiler starts up, when the operating load varies, or when the required steam amount exceeds the generated steam amount.

  The carry-over phenomenon is not preferable in the case of using steam directly for humidification because the boiler water moves to the point of use, which is not preferable in terms of safety, and when the steam is directly used in the production process. However, the boiler water is not preferable because it may adversely affect products and production facilities.

Conventionally, in order to prevent the occurrence of the carry-over phenomenon, each boiler is provided with a steam separator. Furthermore, as a countermeasure against a case where gas-liquid separation is not sufficiently performed with one gas-water separator and a carry-over phenomenon may occur, it has been proposed to provide the boiler with the gas-water separator twice.
JP-A-8-49805 JP 2000-317213 A

  The present invention performs a further gas-liquid separation of a plurality of multi-tube once-through boilers having gas-liquid separators without using a double steam-water separator in each boiler with a single wet component separator. An object of the present invention is to provide a multi-tube type once-through boiler apparatus that achieves cost reduction by simplifying the apparatus and saving space.

  Further, the present invention provides a multi-tube which recovers heat of boiler water (drain) separated by the wet component separator and heats water supplied to the boiler to save fuel and reduce costs by saving energy. An object is to provide a cross-flow boiler device.

In order to solve the above-mentioned problems, a multi-tube once-through boiler apparatus according to the present invention includes a plurality of multi-tube once-through boilers having a steam separator, and steam outlet pipes of the steam / water separator connected together. A steam pipe provided in the steam pipe, and a drain pipe provided in the water supply tank of the boiler from the wet component separator (Claim 1). .

  In the multi-tube once-through boiler apparatus of the present invention, the steam take-out pipes of the steam separators provided respectively in a plurality of multi-tube once-through boilers are connected and assembled into a single steam pipe, and A wet component separator is provided at the location. In addition, the said wet component separator is provided in the arbitrary positions of a steam supply path according to circumstances, such as a use of steam, installation space.

  The wet component separator in the present invention may be any device capable of separating gas and liquid, such as a cyclone method and a filter method. The plurality of groups means an arbitrary number of two or more.

According to the present invention, it is not necessary to provide a double steam separator in each boiler, and the wet components in steam generated from a plurality of multi-tube once-through boilers can be collected and separated, The cost can be reduced through simplification and space saving. Furthermore, the heat of the boiler water (drain) separated by the wet component separator is recovered to heat the feed water to the boiler, thereby saving fuel and reducing costs by saving energy.

Another invention of the present application is characterized in that the drain pipe is passed through a water supply tank of the boiler (claim 2).

  According to the above invention, the heat of boiler water (drain) separated by the wet component separator can be recovered, and the feed water to the boiler can be heated by heat exchange with the feed water, thereby reducing the fuel used. Cost reduction by energy saving is possible. The heat exchange is effective in recent years when an organic anticorrosive, an organic oxygen scavenger, various amines, etc. are used for boiler water treatment for the dehydrazine treatment. That is, when boiler water (drain) separated by the wet component separator is supplied to water supply having a low temperature in the water supply tank, there is a concern that slime is generated in the water supply tank and the strainer or piping is blocked. It is effective when there is.

Still another invention of the present application is characterized in that the drain pipe is connected to a water supply tank of the boiler (Claim 3).

  Also in the above invention, the heat of the boiler water (drain) separated by the wet component separator can be recovered, the water supplied to the boiler can be heated, the fuel used can be reduced, and the cost can be reduced by saving energy. . In the present invention, since the boiler water (drain) separated by the wet component separator is directly mixed with the feed water to the boiler, the boiler water is treated with an inorganic anticorrosive agent, and the wet component separation is performed. It is used when there is no risk of slime formation even when mixed with boiler water (drain) separated by a vessel.

  Each embodiment of the invention is characterized in that the wet component separator is provided at a position before the primary steam header to which the steam pipe is connected (Claim 4). According to one embodiment of this, all the wet components of steam generated from a plurality of multi-tube once-through boilers and reaching the primary steam header through the steam pipe are removed by the wet component separator, Each system branched in the primary steam header is supplied with steam from which all wet components have been removed.

  In another embodiment of the invention, the wet component separator is provided in a system pipe branched from a primary steam header to which a steam pipe is connected (Claim 5). According to this embodiment, the wet component of the system pipe that requires high purity out of the vapor collected in the primary steam header is removed by the wet component separator, and high purity steam is required. Can be sent to the system pipe.

  According to each invention of the present application, it is possible to reduce costs by simplifying the apparatus and saving space, further reducing fuel consumption, and reducing costs by saving energy.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. In FIG. 1, reference numeral 1 denotes a multi-tube once-through boiler in which a water pipe group 4 is provided between an upper gather 2 and a lower gather 3.

  A steam / water separator 5 is provided at each side of each multi-tube once-through boiler 1, and the steam / water separator 5 is connected to the top shifter 2 by a connecting pipe 6, and further, a downcomer pipe 7 is connected to the lower alignment 3. Further, a water supply pipe 9 led from a water supply tank 8 is connected to the lower gather 3. In the figure, 10 is a burner for heating the water tube group 4 from the side.

  In the present invention, the steam extraction pipes 11 of the steam separator 5 provided in each of the multi-tube once-through boilers 1 are connected and assembled to a single steam pipe 12, and wet component separation is performed in the steam pipe 12. A vessel 13 is provided. Then, the steam from which the moisture is removed by the wet component separator 13 is supplied to the primary steam header 15 through the pipe 14.

  Furthermore, a drain pipe 16 is provided in the wet component separator 13, and the drain pipe 16 is formed in a heat exchanger 17 that passes through the water supply tank 8 and heats the water in the water supply tank 8. Yes.

  In the multi-tube type once-through boiler apparatus having the above-described configuration, the water supplied from the water supply tank 8 to the lower header 3 is heated by the water tube group 4 by the burner 10, so that the water-gas liquid contained in the boiler water. It becomes mixed water, passes through the upper header 2 and the connecting pipe 6 and is sent to the steam separator 5. Gas-liquid separation is performed by the gas-water separator 5, and the separated boiler water is returned to the lower gather 3 through the downcomer 7.

  When there is a load fluctuation in the multi-tube once-through boiler 1, the steam-water separator 5 does not sufficiently perform gas-liquid separation, and the boiler water that cannot be separated from the steam is discharged from the steam outlet pipe 11 together with the steam. When supplied to the steam pipe 12, the wet component separator 13 is reached, gas-liquid separation is performed in the wet component separator 13, and high-purity steam passes through the pipe 14 to the primary steam header 15. It is sent to a necessary system and sent to a use point (not shown).

  On the other hand, the boiler water (drain) separated by the wet component separator 13 is discharged from the drain pipe 16, and the drain pipe 16 is passed through the water supply tank 8 and formed in the heat exchanger 17. Therefore, heat exchange with the water supply in the water supply tank 8 is performed, and the water supply in the water supply tank 8 is heated.

  As described above, according to the present invention, even when a large amount of boiler water is carried over due to load fluctuation or the like, the boiler water carried over by the wet component separator 13 can be separated and does not include boiler water. Steam of high purity can be stably supplied, and boiler water (drain) separated by the wet component separator 13 is heat-exchanged with the feed water in the feed water tank 8 to recover heat and reduce heat loss. be able to.

  A specific embodiment will be described below with reference to FIG.

Boiler: Maximum evaporation 2.0t / h x 4 units Water supply: 1-8t / h
Total water supply: 3460t / month
Blow rate: 10%
Fuel: Heavy oil A Boiler efficiency: 90%
Operation method: Automatic number control Normal pressure: 0.5-0.7MPa
When the flow rate of boiler water carried over in the multi-tube once-through boiler apparatus was measured, a carry-over of 100 L / h or more was always confirmed (carry-over rate was 6% on average).

  As shown in FIG. 1, the wet component separator 13 is installed in the pipe 14 in front of the primary steam header 15 and the boiler water that has been carried over is separated. As a result, 96% or more of the boiler water that has carried over is obtained. Separation by the wet component separator 13 was confirmed. The wet component separator 13 employs a cyclone type.

  The separated boiler water is a water treatment with an organic anticorrosive agent, and the feed water temperature is less than 60 ° C., which may cause slime formation. Therefore, heat exchange between the boiler water and the feed water is performed by the heat exchanger 17. Heat recovery. As a result, the temperature of the boiler water decreased by about 100 ° C., and the amount of fuel used was calculated from the amount of heat exchanged as follows.

100 × 3460 × 0.9 × 0.06 × 0.96 ÷ (90/100 × 10000) = 2.0 t / month (Equation 1)
In the above formula 1, 100 = reduction temperature, 3460 = total water supply amount (/ h) × separator efficiency (96%), 0.9 = 1− (blow rate / 100), 0.06 = carry over rate, 0 .96 = separation efficiency, 90/100 = combustion efficiency, 10000 = low calorific value of fuel.

  FIG. 2 shows another embodiment. This embodiment is different from the embodiment of FIG. 1 in that the wet component separator 13 is provided in a system pipe 18 branched from the primary steam header 15. The other parts are denoted by the same reference numerals as in FIG. According to this embodiment, the wet components are removed from the primary steam header 15 in a system that requires particularly high steam purity, and steam with high purity that does not contain boiler water can be sent.

  FIG. 3 shows still another embodiment. This embodiment is different from the embodiment of FIGS. 1 and 2 in that the drain pipe 16 of the wet component separator 13 is connected to the water supply tank 8, and the wet component separator 13 The separated boiler water (drain) is directly supplied to and mixed with the feed water in the feed water tank 8 to recover heat and water. Other parts are denoted by the same reference numerals as those in FIGS. One embodiment of this embodiment is employed when the boiler water is subjected to an inorganic anticorrosion treatment and mixed with the boiler water (drain) separated by the wet component separator, and there is no risk of slime formation. The

  In the embodiment of FIG. 3 as well, the wet component separator 13 can be provided in a branched system pipe from the primary steam header 15 as in the embodiment of FIG. .

1 is a schematic view of a multitubular once-through boiler apparatus according to an embodiment of the present invention. It is the schematic which shows other one Embodiment of this invention. It is the schematic which shows other one Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Multi-tube type once-through boiler 5 Steam / water separator 8 Water supply tank 11 Steam extraction pipe 12 Steam piping 13 Wet component separator 15 Primary steam header 16 Drain pipe

Claims (5)

A plurality of multi-tube once-through boilers having a steam / water separator, a steam pipe in which steam outlet pipes of the steam / water separator are connected and assembled, a wet component separator provided in the steam pipe, A multi-tube type once -through boiler apparatus comprising: a drain pipe provided from the wet component separator to a water supply tank of the boiler. The multi-pipe once-through boiler apparatus according to claim 1, wherein the drain pipe is passed through a water supply tank of the boiler. The multi-pipe once-through boiler apparatus according to claim 1, wherein the drain pipe is connected to a water supply tank of the boiler. The multi-tube type once-through boiler apparatus according to claim 1, 2 or 3, wherein the wet component separator is provided at a position before the primary steam header to which the steam pipe is connected. The multi-tube type once-through boiler apparatus according to claim 1, 2 or 3, wherein the wet component separator is provided in a system pipe branched from a primary steam header to which a steam pipe is connected.

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