JP2021109116A - High temperature gas purification apparatus - Google Patents

Abstract

To provide a high temperature gas purification apparatus where silica and fine solid matter in a high temperature gas do not stick and stack on the heat transfer wall of an exhaust heat recovery device when the high temperature gas passes the exhaust heat recovery device.SOLUTION: In a high temperature gas purification apparatus,: an obstacle is installed in the flow passage of a high temperature gas containing silica and fine solid matter; the silica and the fine solid matter in the high temperature gas are stuck on the obstacle and stacked; the silica and the fine solid matter are removed from the high temperature gas before the high temperature gas is supplied to an exhaust heat recovery device; the silica and the fine solid matter stuck and stacked on the obstacle are washed and removed; and the fitting and removal of the obstacle are performed for the recycling of the obstacle.SELECTED DRAWING: Figure 1

Description

The present invention relates to a high temperature gas purifying device for removing silicone and granular solids from a high temperature gas containing silicone and fine solids.

High-temperature gas generated by combustion in combustion equipment that uses combustion air or fuel containing silicone and fine-grained solids includes silica (silicon dioxide, SiO ₂ ) and fine-grained solids produced by oxidative decomposition of silicone. ..

The high-temperature gas discharged from the combustion device is supplied to an exhaust heat boiler installed in the wake of the combustion device and an exhaust heat recovery device such as a heat exchanger, and is used for steam generation and heating of various gases. NS.

When the silica or fine solid matter contained in the high temperature gas passes through the exhaust heat recovery device, it adheres to the heat transfer wall of the exhaust heat recovery device and deteriorates the heat transfer performance of the heat transfer wall.

In the past, in order to restore the reduced heat transfer performance, the heat transfer wall was regularly cleaned to remove adhered silica and fine solids, and the heat transfer wall was replaced with a new one. Correspondence has been taken.

JP-A-7-275647

Conventionally, when high-temperature gas passes through the exhaust heat recovery device, it adheres to the heat transfer wall, and the accumulated silica and fine solids are removed by regular cleaning, or the heat transfer wall is replaced with a new one. Measures have been taken to restore the heat transfer performance of the exhaust heat recovery device, but since the heat transfer wall generally has a geometrically intricate structure, it is possible to efficiently remove silica and fine solids. Limited to the most upstream part of the heat wall. Therefore, the recovery of heat transfer performance is also limited.
Further, when the amount of silica or fine solid matter deposited on the heat transfer wall increases and the heat transfer performance is significantly deteriorated, it is necessary to replace the entire exhaust heat recovery device.

In this way, silica and fine solids adhere to and accumulate on the heat transfer wall of the exhaust heat recovery device to which the high temperature gas is supplied, whereby the heat transfer performance is lowered and the heat recovery amount is reduced. If an attempt is made to maintain the exhaust heat recovery amount in such a situation, the fuel consumption of the combustion device, which is the source of the high temperature gas, will increase, and as a result, the CO2 emission amount will increase. Furthermore, if silica or fine solids adhere to or accumulate on the heat transfer wall significantly, the entire waste heat recovery device must be replaced, which causes an economic loss, which solves this problem. Has been a conventional issue.

The present invention has been made by paying attention to the above-mentioned conventional problems, and when the high temperature gas passes through the exhaust heat recovery device, silica or fine solid matter in the high temperature gas acts on the heat transfer wall of the exhaust heat recovery device. It is an object of the present invention to provide a high temperature gas purification device capable of preventing adhesion and accumulation.

The high-temperature gas purification device of the present invention is provided with an obstacle in the flow path of the high-temperature gas containing silica and fine-grained solids, and the silica and fine-grained solids in the high-temperature gas are attached to and deposited on the obstacle, and the high temperature is formed. Silica and fine-grained solids are removed from the high-temperature gas before the gas is supplied to the exhaust heat recovery device, and silica and fine-grained solids adhering to and accumulated on the obstacle are washed and removed, and the obstacle is re-used. It is characterized in that it is configured so that the obstacle can be attached and detached in order to enable its use.

According to the present invention, since the high-temperature gas containing silica and fine-grained solids is separated and removed from the high-temperature gas before being supplied to the exhaust heat recovery device, the heat transfer of the exhaust heat recovery device is performed. Silica and fine solids will not adhere to and accumulate on the wall and reduce their heat transfer performance. Therefore, when the heat transfer performance deteriorates, the fuel consumption of the combustion device, which is the source of the high-temperature gas, does not increase in an attempt to maintain the exhaust heat recovery amount, and as a result, the CO2 emission amount does not increase. .. Further, the economic loss due to the replacement of the entire waste heat recovery device is eliminated.
In addition, the obstacles provided in the high-temperature gas purification device can be reused by cleaning and removing silica and fine solids that have adhered to and accumulated on the obstacles, so that the operating cost can be minimized. ..

It is an overall block diagram which shows one Example of the high temperature gas purification apparatus of this invention. It is a perspective view which shows the specific example of the packing which concerns on embodiment of this invention. It is a perspective view which shows another specific example of the packing which concerns on embodiment of this invention. It is a perspective view which shows another specific example of the packing which concerns on embodiment of this invention.

Hereinafter, the high temperature gas purification device of the present invention will be specifically described. The present invention is not limited to the following examples, and various modifications can be carried out.

First, the constitution of the high temperature gas of the present invention will be described.

In FIG. 1 showing an embodiment of the high temperature gas purification device of the present invention, reference numeral 1 denotes a combustion device, which includes a burner 2.

Reference numeral 3 denotes a high temperature gas purification device, which includes a filling layer 5 and is connected to the combustion device 1 by a high temperature gas line.

Reference numeral 4 denotes an exhaust heat recovery device, which is connected to the high temperature gas purification device 3 by a high temperature gas line.

Next, the operation will be described.

In the combustion device 1, the fuel supplied from the burner 2 is added to the combustion air supplied from the outside and burned to produce a high-temperature gas. At this time, the silicone contained in the combustion air and fuel is decomposed into carbon dioxide, water (water vapor), and silica, and becomes a part of the high temperature gas.

The high-temperature gas discharged from the combustion device 1 is supplied to the high-temperature gas purification device 3 and passes through the filling layer 5 in which the filling is laminated. At that time, silica and fine solid matter in the high temperature gas are inertially separated from the gas flow and adhere to the surface of the filling.

2, 3 and 4 show specific examples of the filler laminated on the filler layer 5 used in the present invention. The filler shown in FIG. 2 is formed into a columnar shape using a material that can withstand high temperatures such as metal, ceramic, and glass, and has a diameter of about 1 mm to 50 mm. The filling material shown in FIG. 3 has the same material and diameter as the filling material shown in FIG. 2, but has a spherical shape. The filling shown in FIG. 4 is also molded using a material such as metal, ceramic, or glass, and the outer circumference of the columnar shape is composed of plates, and a plurality of plates are irregularly arranged inside, which is a high temperature gas. The purpose is to increase the contact area with and improve the capture performance of silica and fine solids.

The high-temperature gas exhausted from the high-temperature gas purification device 3 is supplied to the exhaust heat recovery device 4, and the heat energy of the high-temperature gas is given to the heated fluid to heat the heated fluid, and then the heated fluid is discharged to the atmosphere. When the exhaust heat recovery device 4 is an exhaust heat boiler, steam is generated, and when the exhaust heat recovery device 4 is a heat exchanger, high-temperature gas is generated.

In the configuration of the prior art, the high temperature gas discharged from the combustion device 1 is supplied to the exhaust heat recovery device 4 as it is, so that silica and fine solids in the high temperature gas are attached to the heat transfer wall of the exhaust heat recovery device 4. It will adhere and accumulate. As a result, the heat transfer coefficient of the heat transfer wall is lowered, and the waste heat recovery performance of the waste heat recovery device 4 is lowered.

If the deposition of silica or fine-grained solids is slight, it can be used continuously by removing the deposits by cleaning the surface of the heat transfer wall. If it drops beyond the permissible range, it will be necessary to replace the entire heat transfer wall or exhaust heat recovery device with a new one.

On the other hand, according to the present embodiment shown in FIG. 1, the high-temperature gas containing silica and fine solids discharged from the combustion device 1 is supplied to the high-temperature gas purification device 3 and provided in the high-temperature gas purification device 3. When passing through the packed material layer 5, silica and fine solids adhere to and accumulate on the packed material and are removed from the high temperature gas. Therefore, when the high-temperature gas is discharged from the high-temperature gas purification device 3 and supplied to the exhaust heat recovery device 4, the high-temperature gas does not contain silica or fine solid matter, so that the waste heat recovery device 4 Silica and fine solids do not adhere to and accumulate on the heat transfer wall, and the heat transfer performance of the exhaust heat recovery device 4 does not deteriorate.

Further, the filling material 5 is removed from the high temperature gas purifying device 3, and after cleaning and removing silica and fine solids adhering to and accumulating on the filling material 5, the filling material 5 is attached to the high temperature gas purifying device again. Can be reused, so operating costs can be minimized.

From the above results, even if the high-temperature gas discharged from the combustion device 1 contains silica or fine solid matter, the fuel consumption of the combustion device 1 does not increase or the CO2 emission does not increase. Further, the economic loss due to the replacement of the heat transfer wall of the exhaust heat recovery device 4 or the entire exhaust heat recovery device 4 is eliminated.

1 Combustion device 2 Burner 3 High temperature gas purification device 4 Exhaust heat recovery device 5 Filling layer 6 Columnar filling 7 Spherical filling 8 Irregularly shaped filling

Claims (3)

A high-temperature gas purification device characterized in that an obstacle is provided in the flow path of the high-temperature gas so that the obstacle can be attached and detached. The high-temperature gas purification apparatus according to claim 1, wherein the obstacle is a filler layer in which fillers are laminated. The high-temperature gas purification apparatus according to claim 1, wherein the obstacle is a plate-shaped obstacle arranged at an angle with respect to the flow direction of the high-temperature gas.

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