JPS6324203B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention effectively recovers the retained heat of high-temperature exhaust gas discharged from various furnaces or boilers from a flue, generates steam, and uses it in other places or equipment that require it. The present invention relates to a method for installing a flue heat exchange device for supplying heat to the flue of an existing furnace.

Regarding the above-mentioned flue heat exchange device, one of the applicants has already filed Japanese Patent Application No. 51-13521 (Japanese Unexamined Patent Publication No.
-97004), and its characteristics are that it is inserted into the inside from the outside through the flue wall in the middle of the flue, and the insertion depth is adjusted by a drive device installed outside. A group of water tubes that can be freely adjusted in size is installed, and the group of water tubes recirculates water inside and exchanges heat with flue exhaust heat to generate steam, which is then used in an air-water cylinder installed outside. It was designed to be collected at

This heat exchange device can adjust the insertion depth (heat transfer area) of the water tube group according to the flue exhaust heat situation.
This is an effective device for efficiently recovering flue exhaust heat. However, if this device is installed in the flue of an existing furnace, it is necessary to either stop the operation of the existing furnace for a long period of time, or install a bypass flue if the operation of the furnace cannot be stopped for a long period of time.

This invention provides an installation method for installing the flue heat exchange device in the flue of an existing furnace without stopping the operation of the furnace for a long period of time and without providing a bypass flue. .

That is, when the flue heat exchange device is installed in the flue of an existing furnace, the present invention provides a new flue in which the inner surface of the steel shell, in which water tube group insertion holes are previously drilled in the upper surface, is lined with fibrous refractories. Flue heat exchange for an existing furnace, characterized by manufacturing a flue, replacing a part of the flue with an existing furnace, and then installing a flue heat exchange device while operating the furnace. This is how to install the device.

Part of the flue in the existing furnace where the flue heat exchange device will be installed can be replaced, and a new flue with a fibrous refractory lined on the inner surface of the steel shell with water tube group insertion holes drilled on the top surface can be installed. By fabricating the new flue in advance and replacing a part of the flue of the existing furnace, the furnace can be operated by attaching a cover to the water tube group insertion hole of the new flue and closing it. In this case, by using a fibrous refractory such as glass fiber as the lining refractory for the new flue, there is no need to preheat and raise the temperature unlike with refractory bricks, and the furnace can immediately start operating, so there is no downtime. can be shortened to a large width.

In addition, the water tube group, air-water cylinder, etc. of the flue heat exchange device can be assembled and installed above the new flue so that the water tube group can be moved in and out of the water tube group insertion port while the furnace is operating.
Additionally, the air and water cylinder may be installed at a location away from the new flue. Therefore, the operation of the existing furnace only needs to be shut down during the period when the new flue is replaced with a part of the old flue.If the operation of the furnace cannot be stopped for a long period of time, for example, in a combustion furnace for pollution control, etc. , is particularly effective, and since there is no need to install a bypass flue, the equipment cost is also reduced and has many effects.

This will be explained below based on the drawings.

FIG. 1 is a sectional view of a flue heat exchange device. 1
is a flue, and a water pipe group 2 is provided which penetrates the ceiling wall of this flue 1 and is inserted into the inside from the outside. The water tube group 2 is supported by a support frame 3, and the support frame 3 is further suspended by a drive device 5 provided at the top of a gate-shaped frame 4 so as to be able to rise and fall. 6 is a guide rail, 7 is a guide roller, and 8 is a heavy peg for balancing during lifting and lowering, which is a device for smoothly lifting and lowering the support frame. In addition, each water pipe in water pipe group 2 has a double pipe structure consisting of an inner pipe and a recovery pipe (outer pipe).
The pure water supplied from the pipe is led to the inner pipe through the header 10, and is returned to the recovery pipe to exchange heat with the flue exhaust heat to generate steam, and the generated steam is passed through the pipe. The steam passes through a collection pipe 11 and is collected as steam from a main collection pipe 12 into a steam cylinder (not shown).

When installing such a flue heat exchange device in the flue of an existing furnace, a new flue is constructed by lining the inner surface of the steel shell with a number of adjacent water pipe insertion holes drilled in the upper surface with fibrous refractories. Manufacture.

FIG. 2 is a plan view of this new flue 1. 13
are the water tube group insertion holes, which are provided in large numbers adjacent to each other.

FIG. 3 shows a partial cross section thereof, where 13 is an insertion hole and 14 is an iron skin. Reference numerals 15, 16, and 17 are fibrous refractories, which are constructed in three layers. Ceramic fibers, glass fibers, asbestos, etc. are used as fibrous refractories.
For this purpose, it is preferable that the inner surface layer 17 has a high degree of fire resistance, and the lower layer 15 has a high degree of heat insulation. This type of lining was applied to the entire surface of the iron skin.

The operation of the furnace of the new flue 1 configured as described above is temporarily stopped, the old flue is dismantled and removed by the same length as the new flue 1, and the new flue 1 is replaced and installed. Once the installation is complete, a cover is attached to the water tube group insertion port 13 to close it off and the operation of the furnace can be resumed.

This is because the lining refractories 15 to 17 of the new flue 1 are made of fibrous refractories such as ceramic fibers, so there is no need for preheating and drying, and the furnace can immediately start operating.

After restarting the furnace, assembly and installation of the flue heat exchange equipment will begin. In other words, the gate-shaped frame 4
If the support frame 3, water tube group 2, etc. are assembled in a predetermined position and then sequentially assembled on the frame 4 in a suspended state such that the water tube group 2 is pulled out from the new flue 1, there will be no hindrance to the operation of the furnace. The water pipe group 2 can be installed without providing

In addition, other auxiliary equipment such as the air-water cylinder is installed at a position slightly distant from the flue, so that it does not interfere with the operation of the furnace.

Therefore, when installing a flue heat exchange device in the flue of an existing furnace, it is possible to install the flue heat exchange device without installing a new bypass flue or stopping the furnace operation for a long period of time. can be installed.

Example The flue is installed in the flue of an existing ammonia combustion furnace (exhaust gas amount: 11,000 Nm ³ /H, exhaust gas temperature: 1,040°C) that strips gas liquid generated in a coke factory and burns the generated ammonia paper using auxiliary fuel. heat exchange equipment (recovered steam amount
4.5 T/H, steam pressure 25 Kg/ ^cm2 A new flue was fabricated with 3 blocks of 56 water tube group insertion holes per block.

Next, the operation of the ammonia combustion furnace was stopped, and a part of the existing flue was replaced with a new flue using a retcher. After completing the installation of the new flue, the water tube group insertion hole was closed with a cover, and the ammonia combustion furnace was restarted. The rest time of the ammonia combustion furnace during this period was 10 hours.

While continuing to operate the ammonia combustion furnace, the flue heat exchange equipment was assembled and installed, and the flue heat exchange equipment was completed 40 days later.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a flue heat exchange device. Figure 2 is a plan view of the new flue, and Figure 3 is a partial sectional view of Figure 2. 1... Flue, 2... Water pipe group, 3... Support frame, 4
... Frame, 5 ... Drive device, 6 ... Guide rail, 7 ... Guide roller, 8 ... Weight, 9 ... Main water supply pipe, 10, 11 ... Header, 12 ... Main recovery pipe, 13 ... ...Water tube group insertion tube, 14...Iron shell, 1
5, 16, 17... fibrous refractory.

Claims (1)

[Claims] 1. In the middle of the flue, a group of water tubes is installed that penetrates the flue wall and is inserted from the outside to the inside, and the insertion depth can be freely adjusted in size by a drive device installed outside, and the group of water tubes is Water is refluxed inside and heat exchanged with flue exhaust heat to generate steam.
When installing a flue heat exchange device that collects the steam into an external air-water cylinder in an existing flue, a fibrous refractory is installed on the inner surface of the steel shell with water tube group insertion holes drilled on the top surface. The method is characterized in that a new flue lined with is manufactured in advance, the flue is replaced with a part of the flue of the existing furnace, and then a heat exchange device for the flue is installed while the furnace is operating. How to install a flue heat exchange device in an existing furnace.