JPS6210592A - Heat exchanger - Google Patents

Abstract

PURPOSE:To allow the cleaning while being operated by welding multiple square pipes together to make them a buffle-cum-heat transmission pipe. CONSTITUTION:Buffle-cum-heat pipes 4a, 4b... which consist of multiple square pipes 6 that are vertically stacked with each of the square pipes 6 placed horizontally and welded together are disposed vertically in the main body 3 with an equal spacing inbetween. Buffle supplemental plate 13, 14 are alternatingly welded to the top and bottom of the buffle-cum-heat transmission pipe composed of a square pipe panel. The joint 7 between the square pipes is connected by welding, and the joint 7 has a spontaneous depression of 0.5-5mm from the square pipe panel surface. By this structure, it becomes easy to clean the entire surface of the heat generating surface of the square pipe 6 from above. Further, the fluid A is caused to generate a turbulence by the joint 7 between the neighboring square pipes 6, improving the heat transfer coefficient.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a heat exchanger, and more particularly, to a heat exchanger.

The present invention relates to a heat exchanger suitable for heat recovery and heat exchange of warm wastewater.

[Prior Art] As is well known, technologies for exchanging heat with warm wastewater and effectively utilizing the waste heat are being implemented in various industries.

There are a wide variety of heat exchangers used in this case, but one type has a plurality of baffles provided in the heat exchanger body, which has an inlet and an outlet for the fluid, and the other, which forms a heat transfer surface. When using a heat exchanger having a plurality of channels for flowing fluid, there are various types such as a shell-and-tube type shown in FIG. 7 and a tubular type shown in FIG. 8. Specifically, the shell-and-tube type shown in FIG. 7 will be described in detail. Reference numeral 2B indicates the heat exchanger body, and an inlet 21 and an outlet 22 are formed on one side and the other side. includes a plurality of baffles 25a.

25b... are divided. Heat exchanger tubes 30 are passed between one header 27 and the other header 28, and the other fluid B flowing from one header 27 passes through a plurality of heat exchanger tubes 30 disposed between baffles 25a, 25bφ... It flows out to the other header 28,
Heat is exchanged during this process.

To explain in detail the tubular type shown in FIG. 8, reference numeral 43 indicates a heat exchanger body, in which an inlet 41 and an outlet 42 are formed on the - side and the other side, respectively, and a plurality of heat exchangers are formed in the body 43. The baffles 44a and 44b are divided into fists. A heat transfer tube 45 is disposed between one header and the other header, and the other fluid flowing from one header is transferred between baffles 44a and 44b.
The heat flows through a heat transfer tube 45 disposed between 44b and 44c and flows out to the other header, where heat is exchanged in this process.

[Problems to be Solved by the Invention] Although the above-mentioned conventional technology has several advantages, it has problems to be solved in the following points. In other words, when carrying out heat recovery heat exchange of hot wastewater as mentioned in the industrial application field, or heat exchange with hot spring water containing various inorganic substances, conventional shell-and-tube heat exchangers and tubular heat exchangers are used. - When using a heat exchanger of the - type, the - polarized fluid is contaminated with living organisms and impurities, so scale and dirt adhere to the heat transfer tube surface. Otherwise, it will not be possible to maintain the target heat exchange amount.

In the shell-and-tube type shown in Figure 7, the lid 29 must be opened and cleaned by removing numerous bolts (1), whereas it is impossible to clean it during operation. Even during operation, cleaning can be performed by removing the lid, but since the cleaning is done from the top, the lower part of the heat transfer tubes 45 and the lower part of the tube group cannot be cleaned.

The present invention recognizes these points and is easy to clean.
It is desirable that the heat transfer surface be a smooth heat transfer surface so that it can be cleaned sufficiently even during operation, and it is easy to clean. However, if the heat transfer surface is smooth, the flow velocity will be constant when the fluid flows. Since the heat transfer coefficient on the heat transfer surface decreases, in order to prevent this and also take into consideration the structure that can be cleaned during operation, the lid structure should be designed to be easy to remove.
Since one of the fluids is placed under atmospheric pressure, there is a problem that it is difficult to respond to changes in the flow rate of that fluid.The object of the present invention is to provide a heat exchanger that can also solve this problem.

[Means for solving the problems] In order to achieve these objects, the present invention has the following technical means. That is, to explain with reference numbers corresponding to the embodiments, the heat exchanger main body 3 is formed with an inlet 1 and an outlet 2 for one fluid A. In the space between the inflow port 1 and the outflow port 2, removable lids 12 are placed at equal intervals.
Auxiliary plates 13 and 14 are vertically installed at the bottom and top of the bottom plate, respectively.

On each auxiliary plate 13, 14, a plurality of rectangular vibros each having a hollow portion 5 formed along the vertical direction of the auxiliary plate 13 are arranged in a panel shape in a vertical line with the rectangular vibros horizontal.

Each of the above square vibros is welded at the joint surface of the square pipes 7
has been done. The panel-shaped square pipes are connected to headers 8 and 9 for the other fluid B, which are provided on the side of the main body 3.
It is connected to the. In other words, the plurality of square vibrators constitute the pufffuls 4a and 4b, and at the same time constitute a heat transfer tube for the other fluid B.

[Function] With the above structure, the entire heat transfer surface of the square vibro can be easily cleaned from the top using a brush or scraper. Also, fluid A flows in from the inlet 1, and the pressure loss when the maximum flow rate flows is calculated depending on the spacing between the baffles 4a, 4b, etc.

The required water head pressure at that time is calculated between the upper end of the square vibrator panel and the inlet 1.
If determined by the dimensional difference between the lower part of the inlet and the lower part of the inlet, the water level will not rise above the lower part of the inlet 1 even at the maximum flow rate, making it possible for the vehicle to open the upper cover even while driving.
Cleaning work becomes possible.

In addition, the adjacent joints 7 of the square vibros are recessed by about 0.5 to 5 cm from the heat transfer end surface 6' of the square vibros, and since this recess is arranged perpendicular to the fluid flow direction, the fluid A is The portion 7 causes turbulence to improve the heat transfer coefficient, and the amount of heat exchange becomes larger compared to a flat heat transfer surface for the same heat transfer area.

Furthermore, regarding changes in flow rate, by designing the spacing between baffles 4a and 4b and 4b and 4csee of the square pipes as described above, it is possible to prevent fluid A from rising above the lower part of the inlet, while the flow rate decreases. In this case, the flow path resistance between the square pipe baffles 4a and 4b, between 4b and 4C, etc. is reduced, so the water head pressure is small, and the water level naturally lowers. However, due to the structure, it is a square vibe bar, full 4a.
, 4b... The water level does not drop from the upper end and fluid A
The flow rate changes continuously in proportion to the flow rate.

[Example] Examples of the present invention will be shown below.

In Fig. 1, 1 is an inlet for warm wastewater, 2 is an outlet for hot wastewater, 3 is a rectangular heat exchanger body, and 12 is a removable lid. It is a baffle-cum-heat transfer tube in which a plurality of square vibros are stacked vertically so that each square vibro is horizontal, and the square pipes are welded together. In the example shown in FIG. 0, 12 sheets are arranged in the space between the inlet 1 and the outlet 2. The square pipe baffle is connected to the fresh water inflow/outflow header 8.9 arranged on the side of the main body 3, and allows fresh water to flow into the hollow part of each corner vibro from the inlet 10 opposite to the flow of wastewater. The flow is made to flow from the outlet 11 while being passed alternately from left to right.

Baffle auxiliary plates 13 and 14 are alternately welded to the top and bottom of the buckle/heating tube of the square pipe flannel, and the fluid A flows alternately up and down along the outer surface of the square pipe baffle to the outlet 2.
In the process, fluid A and fluid B perform counterflow heat exchange on the surface of the square pipe baffle. The flow path length can be calculated by multiplying the flow path cross-sectional area of fluid A by the product of the length of the vibro and the height of the square pipe baffle, the design maximum flow rate, the resistance of the square vibrator baffle surface, the properties of the fluid, etc. The required height between the upper end of the square pipe baffle and the lower part of the inlet 1 is calculated based on the resulting pressure loss, and the installation position is determined.

In the above, the baffle-cum-electric-heating tubes 4a and 4b consisting of square pipe baffles are made by stacking multiple square vibros horizontally as mentioned above, but the square vibros are adjacent to each other. The part 7 is joined by welding as shown in Figure 6, and the adjacent part 7 is naturally concave by 0.5 to 5 cm from the surface of the square pipe panel. The baffle auxiliary plates 13. may be welded at both left and right ends so that the pipes are firmly adjacent to each other.Also, the baffle auxiliary plates 13.
14 are attached by welding in the order of upper 13 and lower 14 from the inflow direction of fluid A, and an angle is attached to the uppermost end for reinforcement and also serves as support for lid 12. Figures 4 and 5
The figure illustrates a detailed example of the method for installing the baffle auxiliary plate.

[Effects of the Invention] As described above, the present invention is effective in preventing impurities and dirt from being mixed in one of the fluids and adhering to the heat exchanger surface.
If it interferes with heat exchange, it can be easily cleaned even during operation, and since the heat transfer surface is flat and vertically arranged, there are places where the heat transfer surface cannot be cleaned. do not have.

Since the heat transfer surface is flat, heat transfer efficiency deteriorates, so by stacking square pipes, recesses are formed in adjacent parts, which creates turbulence in the fluid flow and prevents deterioration of heat transfer efficiency. In the test plant of the present invention conducted by the inventor, the overall heat transfer coefficient was 900 to 1300 kca.
l/'tn'' Hr ℃.

In addition, it was able to respond to changes in the flow rate of fluid A, and with respect to changes in fluid B, it was safe to pressurize up to 4 kg/am'' from the withstand pressure of the square pipe itself.

[Brief explanation of drawings]

The accompanying drawings show embodiments of the present invention, and FIG. 1 is a longitudinal sectional view;
Figure 2 is a sectional view along x-x in Figure 1, Figure 3 is a side view, Figures 4 and 5 are side views of the installation of the auxiliary baffle plate, and Figure 6 is a detailed view of the square pipe panel. , FIG. 7 shows a conventional shell-and-tube type heat exchanger, and FIG. 8 shows a conventional tubular type heat exchanger. In the figure, 3 is the heat exchanger body, 1 is the inlet for one fluid A, and 2
are the outflow ports for fluid A, 4a and 4b are the square pipe baffles, 12 is the lid, 8.9 is the inflow and outflow header for fluid B, 10 is the inflow port for fluid B, and 11 is the inflow port for fluid B. Outlet 6 indicates a square pipe.

Claims (1)

[Claims] A plurality of baffles are provided in the heat exchanger main body 3 in which an inlet 1 and an outlet 2 are formed for one fluid A, and a plurality of channels for flowing the other fluid B forming a heat transfer surface. In the heat exchanger, each baffle of the plurality of baffles is constituted by stacking a plurality of hollow square pipes in a vertical or horizontal line,
The hollow part of the stacked hollow rectangular pipe group having a flat heat transfer surface as a whole is penetrated from one header to the other header, and the other fluid B is configured to flow through the upper part of the heat exchanger main body. A heat exchanger characterized by having a removable lid.