JPH0498099A - Shell and tube type heat exchanger - Google Patents

Abstract

PURPOSE:To remove scale easily and prevent the deterioration of heat exchanging efficiency by a method wherein the title heat exchanger is provided with a plurality of slidable baffle plates orthgonally to tubes substantially and a driving shaft, screwed to the baffle plates, in parallel to the tubes substantially. CONSTITUTION:Explanation is effected with respect to a case when the title heat exchanger is used for the gland steam condenser of a subterranean heat turbine. The heat of steam, entered from the inlet port 11 of steam and air, is deprived by water, entered from a cooling water inlet port 13 and passing through the tube 3, then, the steam is condensed while passing through passages formed by the baffle plates 4 and is discharged to the outside of the system through a drain discharging port 16. When a driving device 6 is operated upon the starting of the deposition of scale, a driving shaft 5a is rotated and the baffle plates 4a, screwed to the driving shaft 5a, are slid on the tubes 3 and are moved toward one side while scraping down the scale. When the driving shaft 5a is turned reversely, the baffle plates move into the reverse direction while scraping down the scale. The scale is removed in such a manner. The removed scale drops into a pocket 9, provided below a cylindrical body 1, and is discharged out of the drain discharging port 16 whereby a steam passage below the baffle plates 4a will never by narrowed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a shell-and-tube heat exchanger having a scale removal function.

[Conventional technology] The conventional nonyl-and-tube heat exchanger was
This will be explained in parts.

31, there are tube sheets 2 at both ends of the body l, and a plurality of tubes 3 are provided between the tube sheets 2. Further, a plurality of baffle plates 4 are provided perpendicularly to the tube 3. The end plate 7 is attached to the tube plate 2.
is attached, one of which is divided into upper and lower sections, with a cooling water outlet 13 provided on the upper side and a cooling water outlet 14 provided on the lower side. Further, a steam port 11 and a steam outlet 12 are provided at both ends of the fuselage 1, and a fan 10 is attached to the outlet 12.In the figure, 5 is a stiver for fixing the baffle plate;
6 indicates a drain outlet.

In the above, as shown in FIG. 4, the cooling water enters from the inlet 13, passes through the tube 3, and exits from the outlet 14. Further, the steam passes through the solidity of the tube 3 while the flow is alternately changed by the cutting plate 4 than the population 11, and the heat is carried away by the cooling water and exits from the outlet 12.

Problems to be solved by the invention: When the above-mentioned conventional heat exchanger is used for geothermal steam or hot water, scale components contained in the steam hot water will precipitate due to condensation of cold air or a decrease in temperature. , there was a problem that it adhered to the outer periphery of the tube and reduced the heat exchange efficiency. In addition, if the amount of scale increases, it will block the steam passage, making it difficult for steam to enter and increasing the pressure, which may cause the heat exchanger to lose its function.

In order to remove this scale, it was necessary to bypass the heat exchanger from the system (which may require a standby unit or alternative equipment) or to shut down the entire facility and disassemble it for cleaning, resulting in a large loss. .

[Means to solve the problem] The present invention takes the following measures to solve the above problems.

In other words, in a shell-and-tube heat exchanger that has tube sheets at both ends in the body and a plurality of tubes between the tube sheets, the tubes are inserted almost orthogonally to the tubes. A plurality of baffle plates that can be slid through and are provided approximately parallel to the tube,
A drive shaft having a thread around its periphery and engaged with the baffle plate, and a drive means for rotationally driving the drive shaft are provided.

[For production]

By the above means, when scale is deposited on the outer peripheral surface of the tube, when the drive means is operated, the drive shaft rotates and the baffle plate moves in the axial direction. At this time, the baffle plate moves while sliding on the outer peripheral surface of the tube, thereby scraping off the scale.

In this way, scale is easily removed, a decrease in heat exchange efficiency is prevented, and the operating rate is improved.

(Example) An example of the present invention will be described with reference to FIGS. 1 and 2. FIG. 2 is a view from ■--■ in FIG. 1.

The parts explained in the conventional example will be given the same numbers and the explanation will be omitted, and the parts related to the present invention will be explained to the living body.

In FIG. 1, a plurality of tubes 3 are provided between tube sheets 2 (one tube is representative in the figure). Further, a plurality of baffle plates 4 are provided substantially orthogonally to the tube 3.

Upper baffle board 41, public air inlet 11 and tea outlet 12C.
The lower baffle plate 4 is placed in the center. Moreover, these are passed through the tube 3 with a predetermined clear run. In addition, the drive shaft 5a is connected to the end plate 7 without the cooling water population 13.
It is penetrated and inserted from the side parallel to the axis of the tube 3 to the tube plate 2 on the cooling water port 13 side. Furthermore, as shown in FIG. 2, the drive shafts 5a are arranged at the upper, lower, left, and right parts on the cross section. Further, a thread is cut around the drive shaft 5a, and the drive shaft 5a is engaged with the baffle plate 4. A gear is provided at the end of the drive shaft 5a that extends outside on the end plate 7 side where the cooling water port 13 is not provided, and is rotatably connected to a drive device 6 as a drive means.

Further, a nozzle pipe having a plurality of nozzles 8 is provided along the inner surface of the body 1 in multiple stages along the tube 3, and a chemical solution supply pipe 15 is provided.
is connected to.

In the above configuration, the operation and effect will be explained next when this heat exchanger is used in a ground steam condenser of a geothermal turbine.

The Grand FM air condenser is a device that guides both air and air from the shaft seal in the axle penetration part of the turbine casing by lowering the internal pressure of the Grand FM air condenser slightly below atmospheric pressure. .

The brown air entering from the steam air inlet II loses its heat as the water entering from the cooling water port 13 passes through the tube 3, and condenses while passing through the passage formed by the baffle plate 4. Water is thrown out of the thread from the red drain outlet 16. The internal pressure of the grand tea condenser is kept slightly lower than atmospheric pressure because the fan 10 exhausts the air that has flowed into the condenser.

When geothermal steam condenses, the scale contained in the steam precipitates as the temperature decreases, but in the grand steam condenser, it precipitates on the outer circumferential surface of the tube 3, so the steam passage area decreases. , the heat transfer efficiency will decrease.

When scale precipitation begins, when the drive device 6 is activated, the drive shaft 5a rotates, and the baffle plate 4a, which is in σ alignment with the drive shaft 5a, slides on the tube 3 and scrapes off the scale. Move to one side. Further, when the drive shaft 5a is reversed, it moves in the opposite direction in the same manner as above, and moves while scraping off the steel. In this way scale is removed.

The removed scale falls into the pocket 9 provided at the bottom of the body 1 and is discharged from the drain outlet 16, so that it does not narrow the steam passage under the baffle plate 4a.

At this time, a chemical solution or water effective for dissolving scale can be supplied from the chemical supply pipe 15 and ejected from the nozzle 8 to dissolve or wash the scale, thereby increasing the scale removal effect.

As described above, scale is easily removed and a decrease in heat exchange efficiency is prevented.

[Effect of the invention] As explained above, the present invention has the following effects.

(1) Scale around the tube can be easily removed.

(2) Therefore, high heat exchange efficiency can be maintained.

(3) There is no need for spare equipment or alternative equipment for disassembly and cleaning.

(4) Continuous operation is possible without stopping the equipment.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is a perspective view of Fig. 1 of the same embodiment, Fig. 3 is a block diagram of a conventional example, and Fig. 4 is a block diagram of a conventional example.
The figure is an explanatory diagram of the operation of the conventional example. 1... Penalty salary 2... Tube plate 3... Tube (only one representative is shown) 4.4a...
Baffle plate 5...Stiver 5a...Drive shaft
6... Drive device 7... Mirror i
8...Nozzle 9...Bokeh, To 10...Fan

Claims (1)

[Claims] In a shell-and-tube heat exchanger having tube sheets at both ends in the body and a plurality of tubes between the tube sheets, a plurality of baffle plates slidable through the tubes substantially perpendicular to the tubes; A shell-and-tube heat exchanger characterized by comprising: a drive shaft that is provided substantially parallel to the tube, has a thread around the periphery, and is screwed into the baffle plate; and a drive means that rotationally drives the drive shaft. exchanger.