JPH058231U - Quencher for high temperature acid gas - Google Patents

Abstract

(57) [Abstract] [Purpose] High-temperature acidity that can be constructed using ordinary carbon steel by preventing the inner wall of the casing from contacting high-temperature acid gas and the cooling medium to prevent acid corrosion due to acid dew point, etc. Get a gas quencher. [Structure] An air insulating layer 21 is provided on the inner peripheral surface of an upstream casing 20 so that the high-temperature acidic gas can pass through the inner peripheral surface 22. The outer periphery of the air insulating layer 21 is surrounded by air. The downstream side casing 30 that extends downstream with a gap 31 between the heat insulating layer 21 and the air insulating layer 21 is provided.
The cooling medium inflow portion 30a communicating with the gap 31 is provided on the entire circumference of the downstream side casing 30 at the upper position of the above, and the cooling medium jacket 40 is provided on the outer peripheral portion of the downstream side casing 30 in communication with the cooling medium inflow portion 30a.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention uses high temperature acidic gas such as coal combustion gas containing corrosive components such as sulfur oxides. The present invention relates to a rapid cooling device for rapidly cooling high-temperature acid gas.

[0002]

[Prior art]

  For example, coal is used in various combustion furnaces such as boilers of thermal power plants, chemical plants, and metal refineries. When burning, sulfur dioxide, sulfur trioxide, etc. are emitted from this combustion device as exhaust gas. The high temperature acid gas containing harmful sulfur oxides of It is necessary to remove the sulfur oxides in these hot acid gases from the ground, A quenching device for quenching the hot acid gas is provided upstream of the gas treatment device.   In these quenchers, spray nozzles are used for hot acid gas passing through the casing. When cooling by spraying a cooling medium such as water from the When cooled, it reaches the dew point and forms droplets (condensation) as sulfuric acid, which causes the casing to Since it is corroded, the quenching part contains a large amount of nickel, chromium, etc. to prevent this. High-grade acid resistance, corrosion resistant metal or acid resistance, corrosion resistance of expensive materials such as Hastelloy (trade name) It is made of corrosion resistant bricks to prevent corrosion.

[0003]   On the other hand, in order to avoid the use of such expensive materials, the applicant first issued It is shown in the desired Japanese Utility Model Publication No. 1-123535 and Japanese Utility Model Publication No. 1-40991. A quenching device is known in which special consideration is given to such a structure and material.   That is, such a quenching device is provided with an inner peripheral surface portion of the casing through which the hot acid gas passes. In addition, open a predetermined distance in the radial direction from the inner peripheral surface of the casing, such as carbon fiber A protective plate made of heat-resistant and corrosion-resistant resin reinforced with reinforcing fibers is provided. The gas insulation layer is formed between the inner surface of the ring and the Coolant supply spray nozzle for high temperature acid gas in the inner gas passage through the high temperature acid gas flow And the corrosion-resistant liner on the inner surface of the casing in the gas heat insulation layer. A protective material is provided inside the casing to protect it from high temperature acidic gas. By sprinkling water as a cooling medium, water and hot acid gas can be stored inside the casing. It is necessary to prevent condensation by forming a dew point on sulfur oxides by making contact with the wall surface. The corrosion of the housing is prevented.

[0004]

[Problems to be solved by the device]

  However, as mentioned above, high-grade acid and corrosion resistant metals containing large amounts of nickel, chromium, etc. Corrosion prevention equipment using materials such as Is.   Also, in order to avoid this phenomenon, protect the special material inside the casing as described above. A plate is provided and cooling water is sprayed from a spray nozzle in a gas passage inside the plate. In the rapid cooling device, the cooling water is sprayed inside the protective plate, so the surface of the protective plate is As it comes into contact with hot acid gas and water, the protective plate is reinforced with carbon fiber etc. as described above. It must be composed of special materials such as heat and corrosion resistant resin reinforced with fibers. As with the housing, the problem is that general carbon steel cannot be used and it is difficult to manufacture. It

[0005]   On the other hand, in the above configuration, the surface of the protective plate is cooled by the cooling water of the spray nozzle. Form a falling layer to protect the surface of the protective plate from high temperature acidic gas and protect it. Even if you try, it is spray spraying, so the downflow layer will definitely break off Therefore, the surface of the protective plate cannot be reliably protected from the acidic atmosphere.   Further, in the above configuration, the gas heat insulating layer has the upper end opened to the gas passage. As a result, high temperature acidic gas flows into the gas insulation layer, and Since water is injected toward the inside, spray water easily enters the inside of the gas heat insulation layer. Has become. Therefore, the inner wall of the casing, which is one of the components of the gas insulation layer The (iron crust) is exposed to high temperature acidic gas and water, and sulfuric acid is condensed on the inner wall to easily corrode. others For this reason, it is necessary to put a corrosion resistant lining on the inner wall surface of the casing. In this case, it is necessary to use a lining material having a high heat resistance temperature.

[0006]   The present invention solves the drawbacks of the conventional quenching device and replaces the quenching device with a casing. The inner wall of the plug is protected from contact with hot acid gas and cooling media such as water. High temperature that can prevent corrosion due to dew point, etc. and can be constructed using ordinary carbon steel The purpose is to obtain a quencher for acid gas.

[0007]

[Means for Solving the Problems]

  In order to achieve the above object, the high temperature acidic gas quenching device of the present invention comprises: (1) Rapid cooling of hot acid gas flowing in the casing with a cooling medium in the casing In the rapid cooling device for high temperature acidic gas, the inner peripheral surface of the upstream casing The air-insulating layer was installed on the inner part of the air-tight part, and the high temperature acid gas passed through the inner surface. Around the outside of this air insulation layer, make a gap with the air insulation layer around the entire circumference and The downstream side casing that extends to the upper side of the air insulation layer A cooling medium inflow portion that communicates with the gap is provided all around, and communicates with this cooling medium inflow portion. The cooling medium jacket is provided on the outer peripheral portion of the downstream side casing. (2) In the configuration of (1) above, the inflow portion of the cooling medium communicating with the gap is downstream. It is constructed by forming a sawtooth triangular weir all around the upper end of the side casing. is there. (3) In the configuration of (1) or (2), the gap portion and the downstream portion thereof. The inner wall of the casing on the downstream side of the is there.

[0008]

[Action]

(1) The hot acid gas is sent into the casing on the upstream side of the quenching device, and the It passes through the peripheral surface and is fed into the downstream casing. Meanwhile, around the outside of the air insulation layer In the gap formed around the entire circumference with the downstream side casing, air insulation In the upper part of the layer, the cooling medium is installed from the cooling medium jacket all around the downstream casing. Inflow from the digitized inflow section. Therefore, the inner wall of the entire circumference of the downstream casing is A wetting wall, or curtain of cooling medium, is formed that descends along the surface. High temperature acidity The gas is subjected to the quenching action by this wet wall, but at this time, first, the cooling medium is quenched. Air insulation layer is located in the upstream casing of the part that is taken into the equipment Therefore, the hot acid gas is not rapidly cooled by the action of this air insulation layer. At the beginning (boundary), the inner wall of the casing and the inner surface of the air insulation layer reach the acid dew point. This prevents dew condensation of sulfuric acid.

[0009]   Then, when the hot acid gas passes through the air insulation part, it is subjected to the quenching action by the wet wall. Kick However, at this time, a wet wall is formed on the inner wall surface of the entire circumference of the downstream casing. Therefore, the inner wall surface of the downstream casing is shielded from high temperature acid gas and Contact with gas is prevented. This prevents dew condensation on the inner wall surface.   This protects the hot acid gas quench from corrosion. Therefore, quench The device can be formed using carbon steel. (2) The inflow part of the cooling medium communicating with the gap extends over the entire circumference of the upper end of the downstream casing. By using a saw blade-shaped triangular weir formed by Overflow from this triangular weir and flow into the gap more evenly from the entire circumference, The cooling medium flows more evenly over the entire inner wall surface of the downstream casing. And the cooling medium Even if there is a fluctuation in the body supply amount or there is a slight inclination in the downstream casing, the downstream casing The entire inner surface of the ring can be a wet wall. Therefore, the downstream cable The inner wall surface of the sing is more reliably shielded from the hot acid gas.

[0010] (3) A corrosion-resistant lining is attached to the inner wall surface of the gap and its downstream portion. And the cooling medium curtain is cut off unexpectedly, or the cooling medium jacket The cooling medium supplied to the inside of the tank is circulated and used after passing through the quenching device. If it becomes a liquid containing a portion of it, or if it becomes a wetting wall, Corrosion resistant lining even when it becomes acidic such as dilute sulfuric acid while descending the surface Corrosion of the inner surface of the more downstream casing can be prevented. Also used in this case The inner wall of the downstream casing is cooled by the wetting wall. Therefore, a lining material having a low heat resistant temperature can be used.

[0011]

【Example】

  Next, the present invention will be described in detail with reference to the embodiments shown in the drawings.   FIG. 1 is a vertical sectional view showing an embodiment of a high temperature acidic gas quenching apparatus of the present invention.   Reference numeral 10 denotes a casing, which is a high temperature acidic gas containing a corrosive gas such as sulfur dioxide. Has been sent. On the downstream side of the gas flow of the casing 10, a high temperature acid gas quenching device is installed. The upstream casing 20 is located, and the inner peripheral surface of the upstream casing 20 is An air insulation layer 21 having a predetermined length in the gas flow direction is formed. This air The heat insulating layer 21 is formed inside the casing 20 at the inner peripheral surface of the upstream casing 20. A vertical inner peripheral member 21a positioned a predetermined distance from the wall and an upper inverted conical member 2 1b and the lower horizontal member 21c seal the air inside and It is formed as a closed annular space. Inner peripheral part of this air insulation layer 21 The hot acidic gas passes through the inside of the inner peripheral surface 22 of the material 21a.

[0012]   On the other hand, around the outside of the air insulating layer 21, the outer surface of the upstream casing 20 and the required surface are provided. The downstream casing 30 is arranged with a gap 31 between the The upper end 30a of the ring 30 is located above the air insulation layer 21, and It is located a predetermined distance H below the upper end of 21. And the downstream case The upper end 30a of the ring 30 is formed as an inflow portion of cooling water as a cooling medium. In this inflow part, a saw blade-shaped triangular weir 3 is provided all around the upper end 30a of the downstream casing 30. 4 are formed. An outer wall is provided on the outer peripheral portion of the upper portion of the downstream casing 30, and the outer casing is provided with an outer wall. A water jacket 40 extending upward beyond the cooling water inflow portion of the upper end 30a of the thing 30. Is installed. 41 is an appropriate number of cooling units provided around the lower portion of the water jacket 40. It is a drainage water supply port. Portion of the gap 31 of the downstream casing 30 and its downstream portion A corrosion resistant lining 32 is attached to the inner wall surface of the.

[0013]   In such a structure, the hot acidic gas is sent through the casing 10, The inner peripheral surface 22 of the air-insulating layer 21 of the casing 20 on the upstream side of the quenching device is reached. To the downstream side. On the other hand, the cooling water in the water jacket 40 is cooled by the downstream case. The saw blade-shaped three parts that are the inflow parts of the cooling water formed all around the upper end 30a of the thing 30. Corrosion resistance of the inner surface of the downstream side casing 30 overflowing from the corner weir 34 and flowing into the gap 31. The surface of the flexible lining 32 descends, and a wet wall (water curtain) 33 is formed on this surface. To be done. Then, the cooling water is introduced into the gap 31 which is the quenching start portion of the quenching device. In the portion, the inner peripheral surface portion of the upstream casing 20, which is the inside of the gap 31, has no air cutoff. Since the heat layer 21 is formed, the inner peripheral surface 22 of the air heat insulating layer 21 is not rapidly cooled. It is possible to prevent condensation of sulfuric acid due to rapid cooling of high temperature acidic gas in the part. The cooling water flows into the gap 31 at a predetermined distance H below the upper end of the air insulating layer 21. Therefore, near the inflow part of the hot acid gas into the air insulating layer 21, that is, in the shape of an inverted cone The cooling water flow, such as the inner wall surface of the upstream casing 20 at the inner surface of the member 21b or the upper portion thereof, The inner wall around the inlet is also not cooled rapidly, and dew condensation is prevented at that portion, which is dependent on the acid dew point. Corrosion is also prevented.

[0014]   Then, the high temperature acidic gas passes through the air heat insulating layer 21 and passes through the downstream casing 30. It flows in the downstream direction and is rapidly cooled by the wetting wall 33 due to the water curtain. This At this time, since the wetting wall 33 is formed in the downstream side casing 30, Not only the corrosion resistant lining 32 of the inner wall surface, but also the inner wall surface itself is shielded from high temperature acid gas. It is cut off and corrosion of the part is prevented. At this time, the wetting wall 33 is cooled by the sawtooth-shaped water. Since it is formed by overflowing from the corner weir 34 and flowing into the gap 31, It is formed as a continuous flow with breakage prevented as much as possible, and quenching action is also Therefore, the corrosion prevention effect is surely performed.   Then, the hot acid gas that has been rapidly cooled here flows further downstream to the desulfurizer. And the like are introduced into a gas treatment device for treating exhaust gas. In addition, the cold The waste water is collected on the downstream side (not shown) of the downstream side casing 30, and is provided separately. It is cooled to a predetermined temperature with a cooling device, etc., and again into the water jacket 40 from the cooling water supply port 41. Introduced and used.

[0015]   In this case, when the cooling water descends on the inner wall surface of the downstream side casing 30, the acidic gas is prevented. Even if it is acidified with dilute sulfuric acid, etc., by the corrosion resistant lining 32 Corrosion of the inner wall surface of the downstream casing 30 is prevented. Also, the corrosion resistant lining 32 Since is cooled, it is possible to use one having a low heat resistance.   As explained above, the members that make up the quenching device are exposed to hot acid gas and water at the same time. The gas near the upstream side of the gas where the contact is prevented and quenching starts The rapid cooling of can be avoided. Therefore, the upstream casing 20 of the component and the inside thereof The air insulation layer 22 and the downstream casing 30 of the above can be made of carbon steel. To be done.   Further, in the present invention, high temperature acid gas invades the internal space of the air insulating layer 21. There is no concern about corrosion due to the acid dew point inside the heat insulation layer as with conventional gas insulation layers. Absent.

[0016]   In the above embodiment, the inflow portion of the cooling water into the gap 31 has a sawtooth triangular weir 34. However, the present invention is not necessarily limited to this. The thing which opened the upper end part 30a of the thing 30 by cutting horizontally may be sufficient.   Moreover, the high temperature acid gas rises in the gap 31 and leaks from the inflow portion of the cooling water at the upper end opening. The upper end 30a of the downstream casing 30 and the upper For example, it extends upward from the upper end 30a over the entire circumference between the flow side casing 20 side. It forms a frusto-conical shroud so that the cooling water inlet is always immersed in the cooling water. The cooling water inflow portion in the shape of a hood may be formed around the entire circumference. In this case, this pickpocket The jet-shaped cooling water inflow portion may be the sawtooth triangular weir as described above.   Furthermore, the corrosion-resistant lining 32 on the inner surface is not always essential, for example, By using new cooling water that does not contain acidic components with a larger water supply amount, etc. Therefore, the corrosion of the casing made of carbon steel can be prevented.

[0017]

[Effect of device]

  As is clear from the above description, according to the present invention,   According to the structure of claim 1, the portion that comes into contact with the hot acid gas is cooled by cooling. To reach the acid dew point, or the hot acid gas and the cooling medium come into direct contact with each other to oxidize. Since it can prevent corrosion, it can be used as a quenching device for high temperature acid gas. It is no longer necessary to use high-grade materials such as heat resistance, acid resistance, and corrosion resistance, and A quenching device should be constructed using carbon steel equivalent to the casing that constitutes the gas duct. It is possible to obtain a quenching device that can be manufactured easily and is economical in terms of price and structure. You can   With the structure of claim 2, the acidity of the inner wall surface of the downstream casing of the quenching device The contact with gas can be prevented more reliably, and the corrosion of the inner wall can be prevented more reliably. Therefore, the certainty of using the carbon steel member can be further enhanced.   With the configuration of claim 3, an inner wall surface that is stronger against an acidic atmosphere is formed. Therefore, the life of the downstream casing made of carbon steel can be maintained for a long time. In addition to being able to do this, the lining material itself is also cooled, so for example rubber rubber with a low heat resistance Inning materials can be used.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a high temperature acidic gas quenching apparatus of the present invention.

[Explanation of symbols]

20 Upstream Casing 21 Air Insulation Layer 22 Air Insulation Layer Inner Surface 30 Downstream Casing 30a Downstream Casing Upper End (Cooling Water Inlet) 31 Gap 32 Corrosion Resistance Lining 33 Wet Wall (Water Curtain) 34 Sawtooth Triangular Weir 40 Water Jacket

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shinichi Furuta             1980 Okiyama, Ogushi, Obu, Yamaguchi Prefecture             Ube Machinery Co., Ltd.

Claims (3)

[Scope of utility model registration request] 1. A quenching device for a hot acid gas, wherein a hot acid gas flowing in a casing is rapidly cooled by a cooling medium in the casing, wherein the inner surface of the upstream casing is hermetically sealed at a high temperature. An air insulation layer is provided so that the acidic gas can pass through, and a downstream casing that extends downstream with a gap between the air insulation layer and the entire circumference of the air insulation layer is arranged around the outside of the air insulation layer. A high temperature acidic gas characterized in that a cooling medium inflow portion communicating with the gap is provided on the entire circumference of the downstream casing, and a cooling medium jacket is provided on the outer peripheral portion of the downstream casing in communication with the cooling medium inflow portion. Quencher. 2. The high temperature acidic acid according to claim 1, wherein the cooling medium inflow portion communicating with the gap is formed with a sawtooth triangular weir all around the upper end of the downstream casing. Gas quencher. 3. The high-temperature acidic gas quenching device according to claim 1, wherein a corrosion-resistant lining is attached to the inner wall surface of the downstream casing of the gap portion and the downstream portion thereof.