Split type heat accumulating type oxidation furnace import and export flue gas distribution structure applied to chemical industry

Abstract

This utility model discloses a split-type regenerative thermal oxidizer inlet and outlet flue gas distribution structure for use in the chemical industry, relating to the technical field of flue gas distribution structures. It includes a regenerative oxidizer with a honeycomb ceramic accumulator, a steel frame, and a central Y-shaped cavity. The steel frame provides fixed support for the central Y-shaped cavity, and the honeycomb ceramic accumulator is positioned at the upper end of the cavity. An inlet and outlet lift valve are externally mounted on the furnace. A purge flue is welded to the central Y-shaped cavity and connected to an external purge duct. Drainage pipes are connected to the bottom of the central Y-shaped cavity, the inlet lift valve, and the outlet lift valve. An inlet connecting duct connects the inlet lift valve and the central Y-shaped cavity; an outlet connecting duct connects the outlet lift valve and the central Y-shaped cavity. This utility model features a split-type structure, fully utilizing the equipment's three-dimensional space, increasing maintenance space, and reducing subsequent maintenance costs.

Description

Technical Field

[0001] This utility model relates to the technical field of flue gas distribution structure, specifically a split regenerative oxidizer inlet and outlet flue gas distribution structure applied in the chemical industry. Background Technology

[0002] Regenerative Thermal Oxidizer (RTO): The waste gas is first heated to near the thermal oxidation temperature by a ceramic regenerator, and then enters the combustion chamber for thermal oxidation. After oxidation, the gas temperature rises, and the organic matter is basically converted into carbon dioxide and water. The purified gas then passes through another ceramic regenerator, where the temperature drops, and it can be discharged after meeting emission standards.

[0003] The existing RTO three-tower structure features a compact box-type layout for the inlet and outlet flues. The honeycomb ceramic regenerator is protected by an insulation structure. The outlet flue, the intermediate Y-shaped cavity, and the inlet flue are located directly below the projection of the honeycomb ceramic regenerator. Each intermediate Y-shaped cavity corresponds to a separate regenerator tower. The inlet flue and outlet flue are interconnected. A separate manhole and a separate purge flue are located on the intermediate Y-shaped cavity, which passes through the outlet flue and leads to the outside. A manhole is located at one end of each end of the inlet flue, and the other end serves as an external duct connection port; these manholes and duct connections are interchangeable. Similarly, a manhole is located at one end of each end of the outlet flue, and the other end serves as an external duct connection port; these manholes and duct connections are interchangeable. For each individual tower, upon entry, the flue gas flows from the inlet flue to the central Y-shaped cavity, then turns upwards through the honeycomb ceramic regenerator into the RTO furnace for combustion. Upon exit, the flue gas flows downwards from the RTO furnace through the honeycomb ceramic regenerator into the central Y-shaped cavity, then flows to the outlet flue. Flue gas flow direction control surfaces are installed on the vertical plates on both sides of the central Y-shaped cavity. By adjusting the opening and closing of these control surfaces, direct discharge of flue gas from the inlet flue through the central Y-shaped cavity to the outlet flue is prevented. Drainage outlets are provided in the central Y-shaped cavity, the inlet flue, and the outlet flue, extending from the side through the bottom H-steel of the skid-mounted structure.

[0004] The existing box-type layout is relatively compact, but it has some problems:

[0005] 1. The intermediate Y-shaped cavity structure requires redundant design. The vertical and inclined plates need to withstand the dual corrosion of flue gas. Using corrosion-resistant metal as the structural layer requires double the corrosion allowance, which increases material costs by about 30%.

[0006] 2. The drain outlet is located too close to the bottom of the skid, leaving no room for maintenance. In addition, the drain outlet pipe diameter is too small, making it impossible to carry out anti-corrosion construction. Ultimately, the only way to combat corrosion is to increase the corrosion allowance. In actual use, feedback shows that the drain outlet has suffered severe corrosion, causing it to detach from the bottom plate of the tank and resulting in large-scale sewage leakage. Even if a new drain pipe is replaced and the anti-corrosion layer is thickened, the leakage problem cannot be completely solved. Utility Model Content

[0007] The purpose of this invention is to provide a gas distribution structure for the inlet and outlet flues of a split regenerative oxidizer applied in the chemical industry, so as to solve the problems mentioned in the background art.

[0008] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a split-type regenerative oxidizer inlet and outlet flue gas distribution structure for use in the chemical industry, including a regenerative oxidizer chamber, wherein the regenerative oxidizer chamber has a honeycomb ceramic heat storage body, a steel frame of the equipment and an intermediate Y-shaped cavity, wherein the steel frame of the equipment is used to fix and support the intermediate Y-shaped cavity, and the honeycomb ceramic heat storage body is located at the upper end of the intermediate Y-shaped cavity.

[0009] The inlet and outlet lifting valves are externally mounted on the regenerator oxidation furnace and connected via air ducts;

[0010] A purge flue is welded onto the middle Y-shaped cavity and connected to an external purge duct. The purge flue blows a uniform airflow into the middle Y-shaped cavity.

[0011] The bottom ends of the intermediate Y-shaped cavity, the inlet lift valve, and the outlet lift valve are all connected to a drain pipe, which is connected to an external drain pipe.

[0012] An inlet connecting air duct is connected between the inlet lift valve and the intermediate Y-shaped cavity;

[0013] An outlet connection duct is connected between the outlet lift valve and the intermediate Y-shaped cavity.

[0014] In a further embodiment, the outlet lift valve is provided with a flue gas flow direction control surface, and the upper end of the outlet lift valve is provided with an outlet flue located above the flue gas flow direction control surface.

[0015] In a further embodiment, the inlet lift valve is provided with a second flue gas flow direction control surface, and the upper end of the inlet lift valve is provided with an inlet flue located above the second flue gas flow direction control surface.

[0016] In a further embodiment, both the inlet riser valve and the outlet riser valve are flue gas flow direction control structures.

[0017] In a further embodiment, a heat insulation structure is fixedly provided on the shell of the honeycomb ceramic heat storage body.

[0018] In a further embodiment, the intermediate Y-shaped cavity is provided with a thickened anti-corrosion layer.

[0019] In a further embodiment, the drain pipes at the bottom of the intermediate Y-shaped cavity, the inlet lift valve, and the outlet lift valve are drain pipe one, drain pipe two, and drain pipe three, respectively.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] 1. This utility model is a split-type regenerative oxidizer inlet and outlet flue gas distribution structure applied in the chemical industry. The box-type structure is redesigned into a split structure, which makes full use of the three-dimensional space of the equipment, greatly increases the maintenance space, and reduces the cost of later maintenance.

[0022] 2. For the intermediate Y-shaped cavity where corrosion is most severe, the structural layer and anti-corrosion layer have been thickened, reducing costs in terms of material usage.

[0023] 3. Improved installation precision of flue gas flow direction control surface results in better flue gas emission indicators.

[0024] 4. The layout of the sewage pipe has changed from the original "concealed pipe" to "exposed pipe", which greatly reduces the possibility of pipe damage. Even if damage occurs, the repair cost is lower than that of the box-type structure. Attached Figure Description

[0025] Figure 1 This is a front view of the main structure of an embodiment of this utility model;

[0026] Figure 2 This is the three-dimensional structure of the main body of this utility model embodiment.

[0027] In the diagram: 1. Outlet flue; 2. Flue gas flow direction control surface one; 3. Outlet riser valve; 4. Drain pipe one; 5. Outlet connecting duct; 6. Drain pipe two; 7. Intermediate Y-shaped cavity; 8. Purge flue; 9. Inlet connecting duct; 10. Drain pipe three; 11. Inlet riser valve; 12. Flue gas flow direction control surface two; 13. Inlet flue; 14. Thickened anti-corrosion layer; 15. Equipment steel structure frame; 16. Thermal insulation structure; 17. Honeycomb ceramic heat storage body. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] This embodiment provides a gas distribution structure for the inlet and outlet flues of a split-type regenerative oxidizer applied in the chemical industry, such as... Figure 1 and Figure 2As shown, the device includes a regenerative oxidation furnace with a honeycomb ceramic regenerator 17, a steel frame 15, and a central Y-shaped cavity 7. The steel frame 15 is used to fix and support the central Y-shaped cavity 7, and the honeycomb ceramic regenerator 17 is located at the upper end of the central Y-shaped cavity 7. The honeycomb ceramic regenerator 17 is generally square in shape, with honeycomb-shaped holes distributed throughout it. An insulation structure 16 is fixedly installed on the shell of the honeycomb ceramic regenerator 17.

[0030] The inlet lift valve 11 and outlet lift valve 3 are externally mounted in the regenerator oxidizer and connected by air ducts. The inlet and outlet pipes are designed to be circular, made of carbon steel, and have a 3mm thick anti-corrosion layer inside.

[0031] The outlet riser valve 3 has a flue gas flow direction control surface 2 inside, and an outlet flue duct 1 located above the flue gas flow direction control surface 2 at the upper end of the outlet riser valve 3. The inlet riser valve 11 has a flue gas flow direction control surface 12 inside, and an inlet flue duct 13 located above the flue gas flow direction control surface 12 at the upper end of the inlet riser valve 11. The flue gas flow direction control surface is designed to be horizontal instead of vertical, so the gravity of the attached components no longer generates an eccentric moment, and gravity is actually beneficial for concentricity control.

[0032] Both the inlet lift valve 11 and the outlet lift valve 3 are flue gas flow direction control structures. The flue gas flow direction control structure is independent and connected to the intermediate Y-shaped cavity 7 through a short section of duct. It is made of carbon steel, and the drain outlet is located at the lowest point of the flue gas flow direction control structure, more than 300mm above the ground. The inner surface is coated with a 3mm thick anti-corrosion layer.

[0033] Meanwhile, a purge flue 8 is welded onto the middle Y-shaped cavity 7 and connected to the external purge duct. The purge flue 8 blows a uniform airflow into the middle Y-shaped cavity 7.

[0034] The bottom ends of the intermediate Y-shaped cavity 7, the inlet lift valve 11, and the outlet lift valve 3 are all connected to drain pipes, which are connected to external drain pipes. The drain pipes at the bottom ends of the intermediate Y-shaped cavity 7, the inlet lift valve 11, and the outlet lift valve 3 are drain pipe one 4, drain pipe two 6, and drain pipe three 10, respectively. The arrangement of the drain pipes has changed from the original "concealed pipes" to "exposed pipes," which greatly reduces the possibility of pipe damage, and even if damage occurs, the maintenance cost is lower than that of the box-type structure. An inlet connecting duct 9 connects the inlet lift valve 11 and the intermediate Y-shaped cavity 7; an outlet connecting duct 5 connects the outlet lift valve 3 and the intermediate Y-shaped cavity 7.

[0035] During normal operation of the RTO, the three regenerators adopt a "one inlet, one outlet, one purge" mode. For one of the regenerators, the gas flow direction is different in different modes. When in the inlet mode, the flue gas flow direction control surface 2 of the outlet riser valve 3 is closed. The flue gas enters the intermediate Y-shaped cavity 7 from the inlet flue 13 through the inlet riser valve 11, and then passes upward through the honeycomb ceramic regenerator 17.

[0036] In exhaust mode, the flue gas flow direction control surface 12 of the inlet riser valve 11 is closed. The flue gas passes through the honeycomb ceramic heat storage body 17 and enters the intermediate Y-shaped cavity 7 downwards, then flows through the outlet riser valve 3 to the outlet flue 1. In purging mode, both the flue gas flow direction control surface 12 of the inlet riser valve 11 and the flue gas flow direction control surface 2 of the outlet riser valve 3 are closed. The flue gas enters the intermediate Y-shaped cavity 7 from the purging flue 8, forcing the flue gas to pass upwards through the honeycomb ceramic heat storage body 17. The improved installation accuracy of the flue gas flow direction control surfaces results in better flue gas emission indicators. The purging flue 8 is designed directly on the intermediate Y-shaped cavity 7, no longer spanning the inlet flue 13 or the outlet flue 1, greatly shortening its length and facilitating anti-corrosion construction.

[0037] In addition, a thickened anti-corrosion layer 14 is provided on the middle Y-shaped cavity 7. For the middle Y-shaped cavity 7 where corrosion is most severe, the internal structure of the middle Y-shaped cavity 7 is enlarged and a 100mm thick thickened anti-corrosion layer 14 is constructed. The outer shell structure uses carbon steel plates with double the thickness, which has both structural strength and sufficient corrosion allowance, and the overall cost is lower than that of the box structure.

[0038] Meanwhile, the height of the outer bottom surface of the middle Y-shaped cavity 7 from the ground is controlled to be more than 300mm. The sewage outlet is set on the bottom or side, with enough space for pipe installation. Even if the pipe is damaged, it can be directly replaced. The length of the sewage outlet is greatly shortened, and the shortest can be shortened to 150mm. Corrosion protection construction becomes easier, and the construction quality of corrosion protection is easier to control.

[0039] Structural optimization: The box-type structure was redesigned into a split structure, making full use of the equipment's three-dimensional space, greatly increasing maintenance space and reducing later maintenance costs. The inlet flue 13, outlet flue 1, and intermediate Y-shaped cavity 7 were completely separated, making full use of the three-dimensional space around the RTO heat storage chamber. Since the inlet flue 13 and outlet flue 1 are independent and extend beyond the heat storage chamber projection, there is sufficient space around the intermediate Y-shaped cavity 7, facilitating later maintenance.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A gas distribution structure for the inlet and outlet flues (1) of a split-type regenerative oxidizer used in the chemical industry, characterized in that, include: The regenerator has a honeycomb ceramic regenerator (17), a steel frame (15) and an intermediate Y-shaped cavity (7). The steel frame (15) is used to fix and support the intermediate Y-shaped cavity (7). The honeycomb ceramic regenerator (17) is located at the upper end of the intermediate Y-shaped cavity (7). The inlet lift valve (11) and outlet lift valve (3) are externally mounted in the regenerator oxidation furnace and connected by air ducts; The middle Y-shaped cavity (7) is welded with a purge flue (8) and connected to an external purge duct. The purge flue (8) purges a uniform airflow into the middle Y-shaped cavity (7). The bottom ends of the intermediate Y-shaped cavity (7), the inlet lift valve (11) and the outlet lift valve (3) are all connected to a drain pipe, and the drain pipe is connected to an external drain pipe; An inlet connecting duct (9) is connected between the inlet lift valve (11) and the intermediate Y-shaped cavity (7); An outlet connection duct (5) is connected between the outlet lift valve (3) and the intermediate Y-shaped cavity (7).

2. The gas distribution structure of the inlet and outlet flues of the split regenerative oxidizer applied in the chemical industry according to claim 1, characterized in that, The outlet lift valve (3) is provided with a flue gas flow direction control surface (2), and the upper end of the outlet lift valve (3) is provided with an outlet flue (1) located above the flue gas flow direction control surface (2).

3. The gas distribution structure of the inlet and outlet flues of the split regenerative oxidizer applied in the chemical industry according to claim 1, characterized in that, The inlet lift valve (11) is provided with a second flue gas flow direction control surface (12), and the upper end of the inlet lift valve (11) is provided with an inlet flue (13) located above the second flue gas flow direction control surface (12).

4. The gas distribution structure of the inlet and outlet flues of the split regenerative oxidizer applied in the chemical industry according to claim 1, characterized in that, Both the inlet lift valve (11) and the outlet lift valve (3) are flue gas flow direction control structures.

5. The gas distribution structure of the inlet and outlet flues of the split regenerative oxidizer applied in the chemical industry according to claim 1, characterized in that, A heat insulation structure (16) is fixedly installed on the shell of the honeycomb ceramic heat storage body (17).

6. The gas distribution structure of the inlet and outlet flues of the split regenerative oxidizer applied in the chemical industry according to claim 1, characterized in that, The intermediate Y-shaped cavity (7) is provided with a thickened anti-corrosion layer (14).

7. The gas distribution structure of the inlet and outlet flues of the split regenerative oxidizer applied in the chemical industry according to claim 1, characterized in that, The drain pipes at the bottom of the intermediate Y-shaped cavity (7), the inlet lift valve (11), and the outlet lift valve (3) are drain pipe one (4), drain pipe two (6), and drain pipe three (10), respectively.

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