JPH0311219Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention is a coal-water slurry (hereinafter referred to as
This invention relates to a CWM heating device used in a device that heats fuel (abbreviated as "CWM") to generate fuel.

[Conventional technology]

Generally, CWM-fired boilers, CWM combustion furnaces, etc.
In order to achieve efficient combustion of CWM, the CWM supply system is equipped with a device to heat the CWM.

FIG. 2 is a diagram showing a general system for heating and burning CWM. That is, 1 in the figure is a CWM tank for accommodating the CWM 2 inside. The CWM 2 is stirred into a slurry by a stirring blade 5 fixed to a rotating shaft 4 that is rotationally driven by a motor 3. stirred into a slurry
The CWM 2 flows through the inside of the CWM transport pipe 7 by the pump 6 and is guided to the CWM heater 8 . On the other hand, the heated steam P is guided into the CWM heater 8 via the steam inlet pipe 9 and the valve 10, and is led into the steam exhaust pipe 1.
1 and is discharged via valve 12. The CWM 2 guided to the CWM heater 8 exchanges heat with the heating steam P and is heated. The heated CWM2 is
It is atomized into fine particles by the atomizer 13 and injected into a boiler or combustion furnace (not shown). In this way, the CWM particles injected into the furnace are combusted by the radiant heat within the furnace.

By the way, in general, in such systems,
As the CWM heater 8, a multi-tube heat exchanger as shown in FIGS. 3a and 3b is used. This multi-tubular heat exchanger has inside a cylindrical body 21,
A plurality of tubes 22 for CWM flow are arranged at predetermined intervals, and both ends of these tubes 22 are fixed to fixed plates 23 and 2 fixed to both ends of the body 21.
4 are welded and fixed, respectively, and the body 21 is fixed by welding.
Jackets 25 and 26 for introducing or discharging the CWM 2 are fixed to both ends of the CWM 2. These jackets 25 and 26 overlap flanges 27 and 28 welded to the connection ends and flanges 29 and 30 welded to both ends of the shell 21, and also connect them to bolts and nuts 31 and 32.
It is attached to the body 21 by fixing with. Further, at a position on the outer circumference of the body 21 and in the vicinity of one end thereof, a diameter larger than that of the body 21 is provided.
A steam chamber 33 that forms a space Q for introducing steam between the two is externally mounted. In a portion of the shell 21 facing the steam chamber 33, a plurality of steam ejection holes 34 that communicate the shell 21 and the steam chamber 33 are bored at equal intervals in the circumferential direction of the shell 21. The steam introduction pipe 9 described above is provided on the outer circumference of the steam chamber 33, and the steam exhaust pipe 11 is provided on the other end of the body 21.

With such a structure, from the jacket 26
The CWM 2 introduced into the CWM heater 8 flows through the tube 22 and is discharged from the jacket 25 to the outside. Further, the heated steam P flows through a route from the steam introduction pipe 9 to the steam chamber 33 to the hole 34 to the inside of the shell 21 to the steam exhaust pipe 11. Therefore, in the process of flowing through the inside of the tube 22, the CWM 2 is heated to a predetermined temperature by exchanging heat with the heated steam P flowing inside the shell 21.

[Problem that the invention attempts to solve]

However, the conventional CWM configured in this way
In the case of a heater, the heated CWM2 flows through the tube 22, thereby increasing the temperature of the tube 22.
As the inner metal surface of the is heated to a high temperature,
Coal in the CWM 2 gradually accumulated and grew on the metal surface, eventually blocking the space inside the tube 22. Therefore, when using this type of CWM heating device, it is necessary to always pay attention to the amount of coal deposited on the inner surface of the tube, which makes continuous heating and combustion of CWM impossible. It was hot.

This invention was made in view of the above problems, and its purpose is to prevent coal in CWM from sticking and accumulating on the inner surface of a high-temperature metal tube, and to improve the efficiency of CWM heating equipment. The purpose of the present invention is to provide a CWM heating device that enables continuous operation.

[Means for solving problems]

This idea has heat transfer fins on the outside and heat transfer fins on the inside.
A CWM flow pipe through which CWM flows is inserted into the steam jacket, and a rotary scraping blade is provided inside the CWM flow pipe, and the scraping blade scrapes the inner surface of the CWM flow pipe. It is characterized by scraping off coal adhering to the surface.

[Effect]

CWM pressurized by a pump etc.
It is introduced inside the CWM flow pipe of the CWM heating device. Meanwhile, heated steam is introduced into the interior of the steam jacket. Therefore, inside the steam jacket, heat exchange occurs between the CWM flowing through the inside of the CWM flow pipe, the CWM flowing through the inside of the steam jacket, and the heating steam flowing through the inside of the steam jacket. is performed, and the CWM is heated. At this time,
The inner surface of the CWM flow pipe through which the CWM flows is also heated. For this reason, the coal in the CWM tries to adhere to the inner surface of the heated CWM flow pipe, but by rotating the rotary scraping blade, the above
Coal that tries to adhere to the inner surface of the CWM flow pipe is scraped off.

[Effect of idea]

According to the present invention, when the CWM is heated, it is possible to prevent the coal in the CWM from sticking and accumulating on the inner surface of the CWM flow pipe which is heated to a high temperature.This makes the maintenance of the CWM extremely easy, and at the same time, the CWM heating equipment can be easily maintained. Can operate continuously. Therefore, it is possible to continuously heat and burn CWM.

〔Example〕

Hereinafter, a CWM heating device according to an embodiment of the present invention will be described with reference to FIG.

In FIG. 1, reference numeral 40 denotes a steam jacket, which introduces heated steam P through a steam inlet 41 provided at the lower end in the figure and discharges it from a steam outlet 42 provided at the upper end in the figure. This steam jacket 40 has a bent rectangular shape.
A central straight portion 43a of the CWM flow pipe 43 is inserted. The CWM flow pipe 43 allows the CWM2 to be heated to flow through the inside, and here, 1
Although only the original CWM flow pipe 43 is shown,
A plurality of CWM flow pipes 43 may be inserted into the steam jacket 40 as required. A plurality of heat transfer fins 44 are protruded from the outer peripheral surface of the CWM flow pipe 43 and located inside the steam jacket 40, and are arranged at equal intervals in the circumferential direction and extend in the radial direction. The heat exchange area is increased. A rotary shaft 45 is inserted into the straight portion 43a of the CWM flow pipe 43 at an axial center position of the CWM flow pipe 43. The rotary shaft 46 has a plurality of scraping blades 46 extending to the inner surface of the CWM flow pipe 43 protruding from its outer circumferential surface at multiple locations in the axial direction.
It is rotatably supported by bearing portions 47 and 48 formed at both ends of a. The bearing portions 47 and 48 include projecting peripheral walls 49 and 50 formed to extend in the axial direction at both ends of the straight portion 44a, and these projecting peripheral walls 49 and 50.
sealed bearings 51 and 52 mounted on the inner surfaces of It is comprised of bolt nuts 57 and 58 that fix the ends of the peripheral walls 49 and 50. A bearing portion 48 that pivotally supports one end side of the rotating shaft 45 has a structure that allows the rotating shaft 45 to extend slightly outward.
A variable speed motor 61 is coaxially connected to the end of the rotating shaft 45 protruding outside the CWM flow pipe 43 via coupling plates 59 and 60. Connection plates 59, 60
are fixed by bolts and nuts 62.

The CWM heating device according to this embodiment configured as described above operates as follows.

In other words, it is pressurized by a pump (not shown).
CWM2 is one end 43 of the CWM flow pipe 43
b, moves along the aforementioned straight portion 43a, and is discharged from the other end 43c. On the other hand, heated steam P sent out from a steam generator (not shown)
After being depressurized, it is introduced into the steam jacket 40 through the steam inlet 41 and further discharged through the steam outlet 42. Therefore, inside the steam jacket 40, the heat transfer fins 44 and the CWM
Heat exchange is performed between the CWM 2 and the heated steam P via the flow pipe 43, and the CWM 2 is heated. this
By heating the CWM 2, the inner surface of the CWM flow pipe 43 is also heated. Therefore, the coal contained in the CWM 2 tends to adhere to the high-temperature metal surface of the inner surface of the CWM flow pipe 43. At this time, when the variable speed motor 61 is driven, the rotating shaft 45 rotates, and the scraping blades 46 fixed to the rotating shaft 45 scrape off the coal that is about to adhere to the inner surface of the CWM flow pipe 43. Therefore, in this case, the CWM flow pipe 4
It is possible to prevent coal from sticking and accumulating on the inner surface of 3. Note that the rotational speed of the variable speed motor 61 is
The most economical speed may be set in consideration of the scraping performance of the scraping blade 46 and the degree of coal adhesion.

As described above, according to this embodiment, the operation of the CWM heating device is not interrupted due to the accumulation and growth of coal, so that the CWM heating device can be operated continuously.

Note that the present invention is not limited to the above embodiments. For example, the shape of the scraping blade may be a spiral shape around the axis of rotation. In this case, the area for scraping off the coal can be further expanded.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a CWM heating device according to an embodiment of the present invention, Fig. 2 is a flow diagram showing a system for heating and combusting CWM, and Fig. 3a is a conventional
Longitudinal cross-sectional view showing a CWM heater, figure b is the same CWM
FIG. 3 is a cross-sectional view of the heater taken along line A-A in FIG. 1...CWM tank, 2...CWM, 3...motor,
4... Rotating shaft, 5... Stirring blade, 6... Pump, 7...
CWM transport pipe, 8... CWM heater, 9... Steam inlet, 10... Steam outlet, 13... Atomizer, 2
1... Trunk, 22... Tube, 25, 26... Jacket, 33... Steam chamber, 40... Steam jacket, 41... Steam inlet, 42... Steam outlet, 43
...CWM flow pipe, 44...heat transfer fin, 45...rotating shaft, 46...scraping blade, 47 , 48 ...bearing part,
51, 52... Sealed bearing, 59, 60... Connection plate, 6
1...Variable speed motor, P...Heating steam.

Claims (1)

[Scope of utility model registration request] A steam jacket through which heating steam flows through the inside, a CWM flow pipe which is provided so as to pass through the steam jacket and has heat transfer fins protruding from the outer surface and through which coal-water slurry flows inside;
A CWM characterized by comprising a rotary scraping blade provided inside the CWM flow pipe to scrape off coal adhering to the inner surface of the CWM flow pipe.
heating device.