JP2000130974A - Heat storing body and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the amount of heat storage per unit volume, and at the same time to reduce the loss of pressure and costs by forming a heat reservoir that is used for collecting and reutilizing heat energy of a combustion exhaust gas by aggregate where a plurality of pipe-shaped members are bound. SOLUTION: Instead of a heat reservoir being formed by filling a conventional interlock saddle-shaped heat storing material made of ceramics, a heat reservoir 1 is formed by aggregate where a plurality of pipe-shaped members 1-1-1-n are bound. Then, the quality of the material of the pipe members 1-1-1-n is selected by considering treatment temperature due to combustion decomposition, corrosiveness, and the like. For example, metal is preferably used instead of ceramics since the metal is inexpensive and is easily subjected to machining such as welding. When the aggregate is bound at two places, one end part of the aggregate is firmly restrained by a tie ring 2, and the center part is preferably loosely restrained by a tie ring 3, thus absorbing the displacement of the pipe-shaped members 1-1-1-n due to difference in thermal expansion for allowing it to escape in one direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat storage combustion type exhaust gas treatment device, and more particularly, to a deodorization device for decomposing and removing exhaust gas containing a malodorous component by burning, the exhaust gas having undergone combustion decomposition treatment possessed. Heat energy,
The present invention relates to a regenerator for a regenerative combustion type exhaust gas processing device for effectively recovering waste heat by performing residual heat of a processing gas using the heat as a heat source, and a method for manufacturing the regenerator.

[0002]

2. Description of the Related Art Conventionally, methods for treating exhaust gas containing malodorous components generated from manufacturing facilities in various industrial fields include a combustion method, an adsorption method, and a biological treatment method. Each of these methods has unique characteristics, and any one of the methods is selected and used in consideration of the composition, concentration, amount of gas, and installation conditions of the target processing gas or the use of the recovered waste heat as appropriate. Have been.

[0003] The combustion method includes a direct combustion method in which exhaust gas containing malodorous components is decomposed under high temperature conditions and a catalytic combustion method in which decomposition is performed under low temperature conditions by catalytic oxidation. In general, when the exhaust gas containing odorous components is decomposed by the combustion method, the process gas is preheated via a heat exchanger to effectively use the thermal energy possessed by the combustion exhaust gas, and the surplus heat is further added. Background Art Heating air by energy and recovering waste heat as warm air has been performed. In particular, in a direct combustion method in which decomposition treatment is performed by high-temperature combustion, waste heat is often recovered as steam by a waste heat boiler. However, there is a case where there is no particular use of the heat energy recovered in various forms except for the preheating of the processing gas. In this case, a large amount of heat energy that is not effectively used is released to the atmosphere.

On the other hand, there is a heat storage combustion method as a method for maximally utilizing the heat energy held by the combustion exhaust gas generated in the combustion method for preheating the processing gas. That is, this is a method in which the heat energy held by the combustion exhaust gas is effectively used by the exhaust gas treatment device itself.

[0005] Conventional heat storage combustion type exhaust gas treatment devices include a two-tower type and a three-tower type. Of these, the two-tower type comprises a heat insulating casing 20 as shown in FIG. The housing 20 is composed of a combustion chamber 21 and two heat storage tanks 22 and 22 ′ arranged in parallel in communication with the combustion chamber 21.
2, 22 'are filled with various heat storage materials. The flow of the processing gas supplied by the exhaust fan 23 is, as shown in FIG.
Switching between 2, 24-3 and 24-4 (dampers 24-1, 24
-4 is open and the dampers 24-2 and 24-3 are closed), and the combustion conditions are determined, and the flow direction of the processing gas is switched continuously and repeatedly at certain time intervals. Then, the combustion exhaust gas of the processing gas containing the malodorous component and the like, which is preheated by passing through the heat storage tank 22 located in the preceding stage of the combustion chamber 21 and burned and decomposed in the combustion chamber 21, is located in the latter stage before being released to the atmosphere. After passing through the heat storage tank 22 ', the stored heat energy is temporarily stored in the heat storage material. At this time, about 95% of the stored heat energy is stored in the heat storage material of the heat storage tank 22 'located at the subsequent stage, and the combustion exhaust gas is discharged to the atmosphere from the duct 25 in a low temperature state.

On the other hand, when the heat energy held by the heat storage material filled in the heat storage tank 22 located on the upstream side of the combustion chamber 21 is consumed for preheating the processing gas, as shown in FIG. Switching of 24-1, 24-2, 24-3, 24-4 (dampers 24-1, 24-4 are closed, dampers 24-2,
24-3 is opened), the flow direction of the processing gas changes,
The upstream heat storage tank 22 serves as a rear heat storage tank, and the downstream heat storage tank 22 'serves as a front heat storage tank, and performs the opposite function.
In the heat storage combustion method, the processing gas is preheated efficiently by repeating this operation continuously and alternately, and heat is stored by the combustion exhaust gas. That is, in the heat storage tank located in the preceding stage of the combustion chamber 21, the processing gas is preheated by radiating the heat storage material heated by the combustion exhaust gas, and in the heat storage tank located in the subsequent stage, the heat energy is stored by the thermal energy held by the combustion exhaust gas. The heat is stored in the material and this is repeated alternately.

However, in the two-column thermal storage combustion system, when the flow direction of the processing gas changes due to the switching of the automatic damper, the unprocessed gas remaining in the thermal storage tank on the preheating step side before the switching is removed. After entering the heat storage process, the gas flows back to the atmosphere and is released to the atmosphere, thereby deteriorating the deodorizing performance. In order to prevent this drawback, three heat storage tanks are provided, and the process is not directly shifted from the preheating process to the heat storage process. Instead, the unprocessed gas remaining in the preheating process is purged and sent little by little to the preheating process together with the processing gas. The three-tower thermal storage combustion system shown in FIG. 8 is one in which the processing gas is completely replaced with the combustion exhaust gas before the process proceeds to the thermal storage step.

[0008] In FIG.
And the three tower heat storage tanks 22, 2
2 ′, 22 ″.
2 'and 22 "are filled with various heat storage materials. The processing gas supplied by the exhaust fan 23 is supplied to the automatic dampers 24-1, 24-2, 24-3 and 24-.
4, 24-5, and 24-6 are configured to be released to the atmosphere via the duct 25, and each heat storage tank 2
2, 22 'and 22 "have automatic valves 26-1, 26-
It is connected to the upstream side of the exhaust fan 23 by a purge duct 27 via the second and 26-3.

First, in FIG. 8A, an automatic damper 24-1 is provided.
24-2, 24-4, 24-5 are closed, 24-3, 24-
6, the processing gas supplied by the exhaust fan 23 is preheated in the heat storage tank 22 'at the preceding stage,
1, the heat is stored in the heat storage tank 22 ", and the heat is stored in the duct 2.
5 to the atmosphere. At this time, the automatic valve 26-1
Since only the open state is switched to open, the combustion exhaust gas stores heat in the heat storage tank 22, and the untreated gas remaining there is recirculated little by little to the exhaust fan 23 through the purge duct 27. It is sent to 22 'to be preheated. Therefore, the untreated gas does not flow back to the atmosphere from the duct 25 directly to the atmosphere.

Similarly, FIG. 8B shows a case where the heat storage tank 22 'is a heat storage tank for sending the residual untreated gas to the preheating step.
(C) shows the case where the heat storage tank 22 "is a heat storage tank for sending the residual untreated gas to the preheating step. In this manner, any of the two-column heat storage combustion method and the three-column heat storage combustion method is used. Even in such a case, the preheated processing gas is supplied to the combustion chamber 21.
Thus, the fuel is further heated by a burner 28 or the like to a temperature required for combustion decomposition, and complete combustion decomposition treatment is performed under high temperature conditions.

In the two-column heat storage combustion system or the three-column heat storage combustion system, the heat storage material 29 which is filled in the heat storage tanks 22, 22 'or 22 "to form a heat storage body is a ceramic interlock saddle as shown in FIG. Shaped materials are widely used, and a honeycomb structure or the like is rarely used. In any case, these heat storage materials 29 have a large specific heat amount and are excellent in heat resistance.

[0012]

However, the saddle-shaped heat storage material 29 which is filled in the heat storage tank and constitutes a heat storage body has a large pressure loss due to its shape, and in the case of a processing gas containing a lot of dust, the dust is separated therefrom. There was a drawback to deposit. Particularly, in a processing gas containing organic silicon, ultrafine silica (SiO ₂ ) dust generated when the processing gas is decomposed by combustion tends to be deposited on the heat storage material 29,
This melts in the process of heat fluctuation due to repeated heat radiation,
In some cases, the plurality of filled heat storage materials 29 are combined in a lump to close the heat storage tank. In addition, since the porosity is large, the bulk specific gravity is small, and in order to fill the heat storage material so as to hold a predetermined amount of heat storage, the heat storage tank has to be enlarged, and naturally the entire apparatus is enlarged accordingly. There was a disadvantage.

According to the present invention, a heat storage element which is filled with a ceramic interlock saddle-shaped heat storage material is used.
It is an object of the present invention to provide a heat storage body having a large amount of heat storage per unit volume, a small pressure loss, and a low price, particularly a heat storage body used for a heat storage combustion type exhaust gas treatment device and a method of manufacturing the heat storage body. .

[0014]

According to a first embodiment of the present invention, there is provided a heat storage element for recovering and reusing thermal energy of combustion exhaust gas, wherein the heat storage element comprises a plurality of heat storage elements. It is characterized by being constituted by an aggregate obtained by bundling the pipe-like members, and each pipe-like member constituting the aggregate is firmly bound at one end of the aggregate, and is substantially thermally expanded at a central portion. In the vicinity of the end where each pipe-shaped member of the assembly is firmly bound, the pipe is partially welded at each abutting portion of an adjacent pipe-shaped member, and further, the pipe is closed. A heat storage element is provided with a member made of a metal or a heat-resistant material that causes turbulence in a gas flow flowing through the shaped member.

According to a second embodiment of the present invention, a pipe-like member cut to a predetermined length is arranged in a row so as to abut a right-angled substantially L-shaped jig provided on one surface of a surface plate. The outer peripheral surfaces of adjacent pipe-shaped members near one end of the pipe-shaped member abutted on the jig are partially welded to each other to produce an integrated pipe-shaped member row, Characterized by a method of manufacturing a heat storage body in which adjacent pipe-shaped members are welded to each other between the pipe-shaped member rows or one end is bound and bound together by a binding ring after stacking the row of shaped members. It is.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view showing one embodiment of a heat storage body of the present invention in which pipe-like members are bundled and bound, and FIG. 2 is a diagram showing an example of arrangement of pipe-like members constituting a heat storage body according to the present invention.
(A) is a diagram showing one embodiment, (b) is a diagram showing another embodiment, FIG. 3 is a diagram showing a first step of a method for manufacturing a heat storage body of the present invention, and (a) is a front view. Figure, (b) is a side view, Figure 4
3 is a view showing details of FIG. 3, (a) is a plan view of FIG. 3 (a), (b) is an enlarged view of a portion A of (a), FIG. 5 is a view showing a second step, and FIG. It is a schematic plan view which shows the heat storage body which assembled the pipe-shaped member and was formed in the substantially column shape as a whole.
In the drawings, 1 is a heat storage body, 2 is a binding ring, 3 is a binding band, 4 is a surface plate, and 5 is a jig.

In the present invention, a plurality of pipe-like members 1-1, 1-2,... 1-n are bundled instead of a conventional heat storage body formed by filling a ceramic interlock saddle-shaped heat storage material. The heat storage element 1 is composed of a body, and the material of the pipe-shaped members 1-1, 1-2,... 1-n is selected in consideration of the processing temperature and the corrosiveness due to combustion decomposition, and is particularly limited. However, for example, metal is preferable because it is less expensive than ceramic and can be easily processed by welding or the like. Also, the pipe-like members 1-1 and 1-
The cross-sectional shape of 2,... 1-n may be circular, square or any other shape, but is preferably circular from the viewpoint of heat exchange efficiency.

The arrangement of the pipe-like members 1-1, 1-2,... 1-n constituting the heat storage body 1 of the present invention is not particularly limited, but for example, the arrangement illustrated in FIG. Yes,
2A is more preferable in terms of heat exchange efficiency than the arrangement of FIG. 2B. Pipe-shaped member 1 to be bundled
The size of -1, 1-2,... 1-n does not necessarily have to be the same, and there is no problem even if pipes of different sizes are used. Desirable pipe member 1
The size of 1, 1-2,... 1-n has an outer diameter of 10 to 40 m.
m, and the thickness is about 0.2 to 4 mm. This is because the heat storage amount per volume decreases when a pipe-shaped member having an excessively large diameter or a small thickness is used, while a pressure loss increases when a pipe-shaped member having an excessively small diameter or a large thickness is used.

An assembly made up of a plurality of pipe-like members 1-1, 1-2,... 1-n for constituting the heat storage body 1 is made of pipe-like members so that the shape of the bundled pipe-like members does not collapse. It is preferable to perform partial welding as described later or to bind with a metal binding ring 2 or a binding band 3 as shown in FIG. 1, but both partial welding and binding with the binding ring 2 and the binding band 3 are preferable. May be used. When the aggregate formed by bundling the pipe-like members 1-1, 1-2,... 1-n is bound at two places, the bundle is strongly bound by the binding ring 2 at one end of the aggregate.
It is preferable that the cable be loosely bound by the binding band 3 at a substantially central portion. Thus, the pipe-like members 1-1, 1-2, which are bundled by being tightly bound on one side and loosely bound on the other.
.. 1-n are absorbed in one direction by absorbing mutual displacement of the pipe-shaped members 1-1, 1-2,. Because it can be.

Depending on the size and / or number of the pipe-shaped members 1-1, 1-2,... 1-n, the binding ring 2 and the binding band 3 may be replaced or used together with the binding ring 2 or the binding band 3 in the vicinity of one end. By partially welding the contacting outer peripheral surfaces of adjacent pipe-shaped members to each other, it is possible to further prevent the displacement of each pipe-shaped member. It is preferable that the flow of the air flow inside the heat storage body 1 be in a turbulent state in order to increase the heat exchange efficiency. For example, by applying a twist in the longitudinal direction of a thin band-shaped member made of metal or a heat-resistant material, and attaching it to the entire length or a part of the inside of the pipe-shaped members 1-1, 1-2,. Member 1-1, 1-2,... 1
The turbulence is forcibly generated in the gas flow in -n to increase the heat transfer coefficient, thereby improving the heat exchange efficiency.

Next, a number of pipe members 1-1, 1-
2, a method for manufacturing the heat storage body 1 from 1-n is shown in FIG.
Referring to FIG. 5, a generally L-shaped jig 5 composed of a horizontal plate 5-1 and a vertical plate 5-2 exhibiting a right angle to one side surface of the surface plate 4 is disposed. Horizontal plate 5
-1, one end thereof, and the outer peripheral surface thereof abut on the vertical plate member 5-2, and then sequentially arrange the pipe-like members 1-2,... 1-n in the same manner. , 1-n adjacent to the pipe-shaped members 1-1, 1-, 1-n adjacent to the one end.
2,... 1-n are partially welded to each other to produce a plurality of integrated pipe-shaped member rows 7-1, 7-2,. Then, the pipe-shaped member rows 7-1, 7-2,.
7-n are laminated in a predetermined shape. At this time, for example, as shown in FIG.
In order to form the pipe-shaped member rows 7-1 as shown in FIG.
When the number of pipe-like members constituting 7-2,... 7-n is increased or decreased, and the pipe-like member rows 7-1, 7-2,. What is necessary is just to become.

Then, the adjacent pipe-like members 1-1, 1-2,... 1-n between the pipe-like member rows 7-1, 7-2,. The heat storage element 1 of the present invention is manufactured by being integrated, or by tightly binding the outer periphery near the one end portion side having the partial welded portion with the binding ring 2 without loosening.

Although it is efficient and inexpensive to manufacture the heat storage body 1 according to the present invention by the method shown in FIGS.
After a number of pipe-shaped members 1-1, 1-2,... 1-n are simply bundled and one end is aligned, the one end is tightly bound with a binding ring, or the vicinity of the aligned one end is mutually connected. It can also be configured by partial welding.

[0024]

Next, examples of the present invention will be described together with comparative examples. Example The specification per unit volume (m ³ ) of a heat storage body composed of an aggregate of pipe-shaped members according to the present invention is as follows. Heat storage material Carbon steel pipe for boiler / heat exchanger Pipe size (diameter x wall thickness) 15.0 × 2.0 mm Total pipe length 4,440 m / m ³ Heat storage unit weight 3,871 kg / m ³ Heat storage unit total surface area 460 m ² / m ³ Opening ratio 53.5% Specific heat (400 ° C) 0.13 Kcal / kg · ° C Thermal conductivity (400 ° C) 33.19 Kcal / m · hr · ° C

The average temperature of the heat storage body of the embodiment is set to 400
When the temperature is set to ° C., the heat storage amount (QN) of the heat storage body becomes QN = 0.13 Kcal / kg · ° C. × 3,871 kg / m ³ × 400 ° C. = 201,292 Kcal / m ³

COMPARATIVE EXAMPLE The specification per unit volume (m ³ ) of a heat storage body filled with a ceramic interlock saddle-shaped heat storage material is as follows. Heat storage material Ceramic interlock saddle Heat storage material dimensions (nominal dimensions) 25 mm Filling amount of heat storage material 84,200 pieces / m ³ Weight of heat storage body 700 kg / m ³ Total surface area of heat storage body 290 m ² / m ³ Specific heat (400 ° C) 0.34 Kcal / kg · ° C Thermal conductivity (400 ° C) 76Kcal / m · hr · ° C

The average temperature of the heat accumulator according to the comparative example was 4
When the temperature is set to 00 ° C., the heat storage amount (QO) of the heat storage body is as follows. QO = 0.34 Kcal / kg · ° C. × 700 kg / m ³ × 400 ° C. = 95,200 Kcal / m ³

As described above, when the heat storage amount per unit volume of the heat storage body under the same conditions is compared between the heat storage body of the present invention and the conventional heat storage body, the heat storage body of the present invention has about twice the amount of heat in the same volume. It became possible to store heat. That is, in order to secure the same heat storage amount, the conventional heat storage body needs to be about twice as large as the heat storage body of the present invention, and the equipment must be large accordingly. Similarly, the pressure loss of the heat storage body of the present invention was less than half that of the conventional heat storage body in a test performed under the same conditions. Further, in consideration of the heat storage amount per unit volume and the thermal conductivity, the heat storage body of the present invention can have a high wind speed of the heat storage body surface of the processing gas, and the size of the equipment can be reduced.

[0029]

As described above, according to the present invention, the heat storage amount per unit volume is large and the pressure loss is small as compared with a heat storage body which is filled with a ceramic interlock saddle-shaped heat storage material. It has become possible to provide a heat storage element which is inexpensive, particularly used in a heat storage combustion type exhaust gas treatment apparatus, and a method for manufacturing the heat storage element.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a heat storage body of the present invention in which pipe-shaped members are bundled and bound.

FIG. 2 is a view showing an example of arrangement of pipe-like members constituting a heat storage body according to the present invention, wherein (a) is a view showing one embodiment thereof,
(B) is a figure which shows another Example.

3A and 3B are diagrams showing a first step of a method for manufacturing a heat storage body of the present invention, wherein FIG. 3A is a front view and FIG. 3B is a side view.

4 is a view showing details of FIG. 3, wherein FIG. 4A is a plan view of FIG. 3A and FIG. 4B is an enlarged view of a portion A of FIG.

FIG. 5 is a view showing a second step of the production method of the present invention.

FIG. 6 is a schematic plan view showing a heat storage body formed by assembling pipe-like members and forming a substantially columnar shape as a whole.

FIGS. 7A and 7B are schematic cross-sectional views of a conventional two-tower exhaust gas processing apparatus using a heat storage body, wherein FIGS. 7A and 7B are diagrams illustrating the flow of a processing gas in a switching state of an automatic damper, respectively.

FIG. 8 is a schematic cross-sectional view of a conventional three-tower type exhaust gas processing apparatus using a heat storage body, in which (a) to (c) each show a flow of a processing gas in a switching state of an automatic damper.

FIG. 9 is a perspective view of a conventional ceramic interlock saddle-shaped heat storage material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat storage body 1-1, 1-2, ... 1-n Pipe-shaped member 2 Binding ring 3 Binding band 4 Surface plate 5 Jig 5-1 Horizontal plate 5-2 Vertical plate 7-1, 7-2, ... 7 −n Pipe-shaped member row W Partial welding

Claims (5)

[Claims] 1. A heat storage element used for recovering and reusing thermal energy of combustion exhaust gas, wherein the heat storage element is formed of an aggregate of a plurality of pipe-shaped members. body. 2. The pipe-shaped members constituting the assembly are firmly bound at one end of the assembly, and loosely bound at a substantially central portion so that displacement due to thermal expansion can be released. The heat storage body according to claim 1, wherein 3. The assembly according to claim 1, wherein each pipe-shaped member of the assembly is partially welded at an abutting portion of an adjacent pipe-shaped member near an end where the pipe-shaped member is firmly bound. The heat storage body as described. 4. The apparatus according to claim 1, wherein a member made of a metal or a heat-resistant material that causes turbulence in a gas flow flowing in the pipe-shaped member is mounted.
Item. 5. A pipe-shaped member cut to a predetermined length is arranged in a line so as to abut a right-angled substantially L-shaped jig provided on one surface of a surface plate. The outer peripheral surfaces of adjacent pipe-shaped members near one end of the abutted pipe-shaped members were partially welded to each other to produce an integrated pipe-shaped member row, and after stacking the pipe-shaped member rows, A method for manufacturing a heat storage element, wherein adjacent pipe-shaped members between pipe-shaped member rows are welded to each other or one end is bound by a binding ring and bound to be integrated.