Heat insulation type CO hearth convenient to maintain and operate

Abstract

The utility model relates to a heat insulation type CO hearth convenient to maintain and operate. The heat insulation type CO hearth comprises a hearth inner wall, a hearth outer wall, an auxiliary heating device, an access door and a heat preservation layer formed by filling aluminum silicate heat preservation cotton between the hearth inner wall and the hearth outer wall. A plurality of longitudinal reinforcing ribs are arranged on the outer surface of the inner wall of the hearth; the reinforcing ribs close to the end of the outer wall are coated with heat-insulating rubber; an openable access door is arranged at the top of the hearth; an auxiliary heating device is arranged close to the air inlet of the hearth, and the operating surface of the auxiliary heating device is exposed and is less than or equal to 1m away from the hearth; the air inlet is provided with an oblique-angle guide plate to reduce airflow resistance; a catalyst is arranged in the hearth. According to the utility model, heat generated by catalytic oxidation reaction in the CO hearth can be effectively isolated, the heat loss of the CO hearth is reduced, the temperature of the outer wall of the CO hearth can reach the temperature touchable by a human hand, and the safety of the CO hearth is improved. In addition, through reasonable structural arrangement, the operation difficulty of equipment maintenance and troubleshooting by maintenance and operation personnel is reduced.

Description

Technical Field

[0001] This utility model relates to the field of organic waste gas treatment technology in ship painting, specifically to a catalytic oxidation (CO) furnace structure with high-efficiency heat insulation performance and easy maintenance and operation. Background Technology

[0002] Shipbuilding has become one of the more popular industries in recent years, and its main processes include steel pretreatment, sectional welding, painting, and assembly. Because these processes generate various forms of pollution, including noise and exhaust fumes, these sources of pollution have become a key focus for shipyards and environmental protection departments.

[0003] In the aforementioned processes, ship painting is a typical source of organic waste gas pollution, primarily from paint volatilization. The concentration of waste gas generated during ship painting operations is related to various factors such as section shape, paint type, and on-site personnel arrangements, exhibiting significant irregularities and distinct peaks and troughs. Furthermore, due to the need for high-volume air exchange in the painting booth according to relevant standards during painting operations, the amount of organic waste gas generated is substantial, with hourly airflow reaching tens of thousands of cubic meters.

[0004] To address the characteristics of "large volume and irregular concentration" of organic waste gas from painting, the commonly used treatment process is the relatively mature "pre-filtration + rotary adsorption + regenerative thermal oxidation (RTO) / catalytic oxidation (CO)". This process uses porous molecular sieves / zeolite rotors to specifically adsorb the organic components in the waste gas, followed by high-temperature gas desorption and concentration, thus solving the "large volume" problem. Furthermore, since the main components of painting organic waste gas are hydrocarbons and alcohols, and it does not contain elements such as sulfur and chlorine that are unsuitable for combustion treatment, thermal oxidation can degrade the organic components into carbon dioxide and water, achieving harmless treatment. Among these processes, catalytic oxidation, using precious metals as catalysts, can significantly reduce the thermal oxidation reaction temperature (around 400℃, compared to over 760℃ without a catalyst) and does not involve open flame combustion, making it the preferred process for treating painting organic waste gas in explosion-proof areas.

[0005] The organic waste gas generated during ship painting operations is characterized by large volume and significant concentration fluctuations. Existing catalytic oxidation furnaces have the following drawbacks:

[0006] 1. The furnace outer wall suffers severe heat loss, resulting in high operating energy consumption;

[0007] 2. The high temperature of the outer wall (>80℃) poses a risk of burns;

[0008] 3. Maintenance requires the removal of the side wall insulation layer, which is a complex operation.

[0009] For example, although patent document (CN112484061A) optimizes combustion efficiency, it does not solve the problem of high temperature on the furnace surface; although patent document (CN114791107A) involves heat recovery, its swirling combustion structure is not suitable for coating exhaust gas treatment scenarios.

[0010] As major shipyards need to "reduce costs and increase efficiency," the energy consumption of various production support equipment, such as coating organic waste gas treatment equipment, has become a significant factor restricting equipment operation. For catalytic oxidation processes, improving the heat storage efficiency of the CO furnace can effectively reduce heat loss during system operation and significantly reduce equipment energy consumption, while ensuring equipment processing efficiency and compliance with emission standards. Based on the current state of industry development, these core points are precisely the problems that this utility model urgently needs to solve. Summary of the Invention

[0011] The purpose of this invention is to provide an easy-to-maintain insulated CO furnace that reduces heat loss during operation without affecting the overall purification efficiency of the CO furnace, thus saving overall system energy consumption. Furthermore, the insulation layer lowers the outer wall temperature of the CO furnace to a temperature range that is within human reach during normal operation, avoiding on-site safety hazards caused by high external wall temperatures. When routine maintenance or troubleshooting is required, the rational structural layout reduces the operational difficulty for maintenance personnel.

[0012] To achieve the above objectives, the technical solution of this utility model is as follows: a heat-insulated CO furnace that is easy to maintain and operate, comprising an inner furnace wall, an outer furnace wall, an auxiliary heating device, and an inspection door; an insulation layer formed by aluminum silicate insulation cotton is filled between the inner furnace wall and the outer furnace wall; the outer surface of the inner furnace wall is provided with several longitudinal reinforcing ribs, and the ends of the reinforcing ribs near the outer wall are covered with heat-insulating rubber; an openable and closable inspection door is provided at the top of the furnace; an auxiliary heating device is provided near the air inlet of the furnace, with its operating surface exposed and the distance from the furnace ≤1m; an angled guide plate is provided at the air inlet to reduce airflow resistance; and a catalyst is arranged in the inner cavity of the furnace.

[0013] Furthermore, an insulation layer is provided on the inner wall of the connecting pipe between the auxiliary heating device and the furnace.

[0014] Furthermore, the thickness of the heat-insulating rubber edging of the reinforcing rib is 5-10mm, and the covering length accounts for 1 / 3-1 / 2 of the total length of the reinforcing rib.

[0015] Furthermore, the maintenance door adopts a hinged structure, and an aluminum silicate sealing strip is installed between the door frame and the outer wall of the furnace.

[0016] Furthermore, the angled guide vane forms an angle of 30-45° with the air intake direction.

[0017] Furthermore, during operation, the surface temperature of the outer wall of the furnace is ≤40℃, and the temperature of the outer wall corresponding to the reinforcing rib is ≤60℃.

[0018] Furthermore, the catalyst is a honeycomb Pt-Pd composite catalyst with a loading density of 200-300 mesh.

[0019] Furthermore, the inner wall of the furnace is made of 310S stainless steel with a thickness of 8-12mm.

[0020] Furthermore, the insulation layer has a thickness of 150-200mm and a thermal conductivity of ≤0.05W / (m·K).

[0021] Furthermore, the CO furnace also includes a temperature sensor group to monitor the temperature of the furnace outer wall in real time and link it to an alarm device. When the temperature exceeds a set threshold, an audible and visual alarm is triggered.

[0022] The beneficial effects of this utility model are:

[0023] This invention relates to an organic waste gas treatment system in a ship painting workshop, providing an insulated CO furnace that is easy to maintain and operate. It effectively isolates the heat generated by the catalytic oxidation reaction within the CO furnace, reducing heat loss and ensuring the outer wall temperature of the CO furnace reaches a temperature that is easily touched by hand, thus increasing furnace safety. Furthermore, its rational structural layout reduces the difficulty for maintenance personnel in equipment inspection and troubleshooting. Attached Figure Description

[0024] Figure 1 This is a cross-sectional view of the heat-insulated CO furnace structure of this utility model, which is easy to maintain and operate.

[0025] Figure 2 This is a top view of the heat-insulated CO furnace structure of this utility model, which is easy to maintain and operate.

[0026] In the diagram: 1. Inner wall of furnace chamber; 2. Reinforcing rib (heat insulation rubber edging); 3. Insulation layer; 4. Outer wall of furnace chamber; 5. Air inlet guide plate; 6. Auxiliary heating device; 7. Inspection door; 8. Catalyst. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] like Figure 1 As shown in Figure 2, the present invention proposes an easy-to-maintain insulated CO furnace, which includes an inner furnace wall 1 (including reinforcing ribs 2), an outer furnace wall 4 (including inspection door), a catalyst 8, an insulation layer 3, an auxiliary heating device 6, etc.

[0029] The furnace has an inner wall 1 and an outer wall 4, with an insulation layer 3 formed by aluminum silicate insulation cotton filling the space between them; an openable and closable inspection door 7 is provided at the top of the furnace; an auxiliary heating device 6 is provided near the air inlet of the furnace; and a catalyst 8 is arranged in the inner cavity of the furnace.

[0030] Preferably, the auxiliary heating device is installed near the furnace inlet, at a distance of ≤1m from the CO furnace, with its operating surface exposed for easy daily maintenance.

[0031] Preferably, the CO furnace air inlet adopts an angled air inlet guide plate to reduce air inlet resistance; the angled air inlet guide plate 5 forms an angle of 30-45° with the air inlet direction.

[0032] Preferably, the outer wall of the furnace is provided with reinforcing ribs to ensure that the overall structural strength meets the standards;

[0033] Preferably, the section of the reinforcing rib near the outer wall of the furnace is edged with heat-insulating rubber to prevent local high temperatures caused by heat conduction from the steel at the reinforcing rib location on the outer wall of the furnace; the thickness of the heat-insulating rubber edge of the reinforcing rib 2 is 5-10mm, and the covering length accounts for 1 / 3-1 / 2 of the total length of the reinforcing rib.

[0034] Preferably, an inspection door is provided at the top of the furnace to facilitate internal maintenance without damaging the side wall insulation layer structure.

[0035] Preferably, the inner wall of the connecting pipe between the auxiliary heating device 6 and the furnace is provided with a heat insulation layer.

[0036] Preferably, the inspection door 7 adopts a hinged structure, and an aluminum silicate sealing strip is installed between the door frame and the outer wall of the furnace.

[0037] Preferably, catalyst 8 is a honeycomb Pt-Pd composite catalyst with a loading density of 200-300 mesh.

[0038] Preferably, the inner wall 1 of the furnace is made of 310S stainless steel with a thickness of 8-12mm.

[0039] Preferably, the insulation layer 3 has a thickness of 150-200 mm and a thermal conductivity of ≤0.05 W / (m·K).

[0040] Preferably, the heat-insulated CO furnace, which is easy to maintain, also includes a temperature sensor group to monitor the temperature of the outer wall of the furnace in real time and link with the alarm device. When the temperature exceeds the set threshold, an audible and visual alarm is triggered.

[0041] Preferably, during operation, the surface temperature of the outer wall 4 of the furnace is ≤40℃, and the temperature of the outer wall position corresponding to the reinforcing rib 2 is ≤60℃.

[0042] The easy-to-maintain insulated CO furnace of this invention operates according to the following control method:

[0043] During operation, the organic waste gas undergoes adsorption and concentration treatment at the front end before entering the CO furnace for catalytic combustion. The furnace temperature reaches 400℃ during combustion, while the overall temperature of the outer wall does not exceed 40℃, ensuring it is safe to touch by hand and preventing on-site safety accidents caused by high temperatures.

[0044] The temperature at the reinforcing ribs on the outer wall of the furnace should not exceed 60℃ to prevent paint peeling off the outer wall of the furnace due to localized high temperatures.

[0045] The auxiliary heating device should be ≤1m away from the CO furnace to reduce heat loss caused by the gas flowing through the pipeline into the furnace. The pipeline from the auxiliary heating device to the CO furnace should be internally insulated.

[0046] When routine maintenance or troubleshooting is required in the CO furnace, the auxiliary heating devices can be inspected directly from the exposed operating surface. Maintenance personnel can enter the CO furnace through the top access door for inspection.

[0047] Example 1:

[0048] The organic waste gas treatment equipment in the painting workshop of a shipyard adopts a "pre-filtration + rotary concentrator + CO" treatment process, with a designed air volume of 150,000 m³ / h. 3 / h, designed concentration is 1600 mg / m³ 3 The painting workshop is equipped with the aforementioned CO furnace, with electric heaters as auxiliary heating devices.

[0049] During equipment operation, under high-concentration loads, the CO furnace temperature can reach 400-500℃. On-site personnel measured the temperature of the outer surface of the CO furnace; the highest temperature did not exceed 40℃, making it safe to touch. After opening the top access door, personnel can enter the furnace for maintenance. The electric heater's operating surface is located adjacent to the safety passage, allowing for direct maintenance operations.

[0050] Example 2:

[0051] A shipyard's painting workshop adopted this utility model to treat 150,000 m³ of CO2 furnace. 3 / h organic waste gas: The inner wall 1 of the furnace is made of 10mm thick 310S stainless steel, and the outer wall 4 of the furnace is made of carbon steel; the longitudinal spacing of the reinforcing ribs is 500mm, and the ends are covered with 8mm thick silicone rubber (300mm in length); the auxiliary heating device 6 is connected to the air inlet through a 1m long heat-insulating pipe (the inner wall is covered with 50mm rock wool); the angled guide 5) is installed at a 40° angle.

[0052] Operating data: When the internal temperature of the furnace is 420℃, the highest temperature on the outer wall surface is 38℃, and the temperature at the corresponding position of the reinforcing rib is 55℃. The energy consumption of electric heating is reduced by 22% year-on-year.

[0053] Example 3:

[0054] Based on Example 2, a temperature monitoring system is added: six K-type thermocouples are arranged on the outer wall 4 of the furnace to monitor the temperature in real time; a three-level early warning is triggered when the temperature at any measuring point is >45℃ (threshold adjustable); the catalyst layer 8 uses a 250-mesh Pt-Pd honeycomb catalyst with a purification efficiency >98%. Maintenance test: the catalyst module can be replaced within 15 minutes through the top inspection door 7 without disassembling the side wall structure.

[0055] The core innovations and technical effects of the heat-insulated CO furnace proposed in this utility model are as follows:

[0056] (1) Composite thermal insulation structure: The inner and outer walls are filled with aluminum silicate insulation cotton, combined with reinforcing rib thermal insulation edging, so that the outer wall temperature is ≤40℃;

[0057] (2) Modular maintenance design: The top maintenance door avoids damage to the side wall insulation layer and allows for quick access to the furnace cavity; optimized thermal efficiency:

[0058] (3) The auxiliary heating device is located close to the air inlet to reduce heat loss in the pipeline.

[0059] Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

Claims

1. A maintenance-friendly, insulated CO hearth, characterized in that The CO furnace comprises a furnace inner wall, a furnace outer wall, an auxiliary heating device, an inspection door, a heat preservation layer formed by filling aluminum silicate heat preservation cotton between the furnace inner wall and the furnace outer wall, a plurality of longitudinal reinforcing ribs arranged on the outer surface of the furnace inner wall, heat insulation rubber covering the reinforcing ribs close to the outer wall end portion, an openable and closable inspection door arranged on the top of the furnace, an auxiliary heating device arranged close to the air inlet of the furnace, an inclined angle flow guide plate arranged at the air inlet to reduce air flow resistance, and a catalyst arranged in the inner cavity of the furnace.

2. The maintenance-friendly, insulated CO hearth according to claim 1, characterized in that A heat preservation layer is arranged on the inner wall of the connecting pipeline between the auxiliary heating device and the furnace.

3. The maintenance-friendly, insulated CO hearth of claim 1, wherein, The thickness of the heat insulation rubber covering of the reinforcing rib is 5-10 mm, and the covering length accounts for 1 / 3-1 / 2 of the total length of the reinforcing rib.

4. The maintenance-friendly, insulated CO hearth of claim 1, wherein, The inspection door adopts a hinge type structure, and an aluminum silicate sealing strip is arranged between the door frame and the furnace outer wall.

5. The maintenance-friendly, insulated CO hearth of claim 1, wherein, The inclined angle flow guide plate forms an angle of 30-45° with the air inlet direction.

6. The maintenance-friendly, insulated CO hearth of claim 1, wherein, The surface temperature of the furnace outer wall is ≤40℃ during operation, and the temperature of the position of the reinforcing rib corresponding to the outer wall is ≤60℃.

7. The maintenance-friendly, insulated CO hearth of claim 1, wherein, The catalyst is a honeycomb Pt-Pd composite catalyst, and the loading density is 200-300 mesh.

8. The maintenance-friendly, insulated CO hearth of claim 1, wherein, The furnace inner wall is made of 310S stainless steel, and the thickness is 8-12 mm.

9. The maintenance-friendly, insulated CO hearth of claim 1, wherein, The thickness of the heat preservation layer is 150-200 mm, and the thermal conductivity coefficient is ≤0.05 W / (m·K).

10. The maintenance-friendly, insulated CO hearth of claim 1, wherein, The CO furnace further comprises a temperature sensor group for real-time monitoring of the temperature of the furnace outer wall and linkage of an alarm device, and sound and light alarms are triggered when the temperature exceeds a set threshold.

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