Organic waste gas incineration device using electrically heated heat storage element

Abstract

This utility model relates to an organic waste gas incineration device using an electrically heated heat storage body, comprising: a heat storage mechanism including several heat storage chambers; an acid removal mechanism connected to the heat storage chambers via waste gas pipelines and cleaning pipelines; and an incineration chamber positioned above the heat storage mechanism, the inner cavity of which is connected to the inner cavities of the heat storage chambers. This utility model features a dedicated cleaning chamber for acid removal treatment of the waste gas; the use of high specific heat capacity and high-temperature resistant heat storage bricks improves heat exchange efficiency and increases the heat exchange surface area per unit volume, ensuring uniform flow of waste gas through the heat storage bricks and preventing localized overheating or undercooling; the use of electric heating wires instead of traditional gas heating fundamentally solves the secondary pollution problem caused by gas combustion; multiple protective measures are applied to the heating wires in the heat storage chambers and incineration chamber, significantly extending their service life; and a carbon dioxide recovery device is added to capture and purify the CO2 generated during waste gas treatment.

Description

Technical Field

[0001] This utility model belongs to the environmental protection industry, specifically relating to the field of industrial waste gas treatment, more precisely to the field of regenerative thermal oxidizer (RTO) technology and volatile organic compound (VOCs) waste gas treatment equipment, and in particular to an organic waste gas incineration device using an electrically heated heat storage body. Background Technology

[0002] In the existing technology, some waste gas treatment equipment does not have a dedicated pretreatment acid removal unit, which cannot completely remove highly corrosive gases such as HCl and SO2 from the waste gas.

[0003] Traditional gas-fired heating technologies (such as regenerative thermal oxidizers (RTOs) and direct-fired incinerators) use natural gas or liquefied petroleum gas (LPG) as fuels. They directly heat waste gas through high-temperature flames generated by burners. However, their energy utilization suffers from two major problems: high fuel consumption and limited waste heat recovery; high energy price sensitivity and poor cost stability, with the combustion process prone to "localized overheating + overall fluctuations," making precise temperature control by zone impossible; and significant safety hazards, requiring complex explosion-proof and leak prevention systems. The risk of gas leaks and explosions necessitates complex safety devices, increasing equipment costs. Furthermore, the use of gas is not environmentally friendly, resulting in secondary pollution and carbon emissions. High carbon emissions fail to meet the "dual carbon" target (carbon reduction and emission reduction), require frequent equipment maintenance, and have lifespan significantly affected by combustion products, leading to carbon buildup and corrosion in the burner, and blockage and aging of the heat storage medium. Additionally, the existing Chinese patent "An Electric Heating RTO for Waste Gas Treatment" (application number: 202420332573.3) uses top electric heating in the oxidation chamber, inevitably causing the heating wires in the heat storage or incineration chamber to come into contact with the waste gas, resulting in a very short lifespan. Utility Model Content

[0004] In view of the deficiencies in the existing technology, the purpose of this utility model is to provide an organic waste gas incineration device using an electrically heated heat storage body that can harmlessly treat VOCs waste gas generated in industrial production (such as coating, chemical, printing, pharmaceutical and other industries).

[0005] To solve the above-mentioned technical problems, this utility model provides an organic waste gas incineration device using an electrically heated heat storage body, comprising: a heat storage mechanism, the heat storage mechanism including a plurality of heat storage chambers; an acid removal mechanism, the acid removal mechanism being connected to the plurality of heat storage chambers through a waste gas pipeline and a cleaning pipeline; and an incineration chamber, the incineration chamber being disposed above the heat storage mechanism, the inner cavity of the incineration chamber being connected to the inner cavities of the plurality of heat storage chambers.

[0006] The heat storage chamber includes: a heat storage cavity, the bottom of which is connected to the exhaust gas outlet and the purified gas outlet of the acid removal mechanism via an exhaust gas pipeline and a cleaning pipeline, respectively; and a heat storage assembly, several of which are stacked inside the heat storage cavity.

[0007] The heat storage component includes: a heat storage bracket disposed in the heat storage chamber; heat storage bricks, a plurality of heat storage bricks laid on the heat storage bracket, and a flue provided inside the heat storage bricks; and heat storage heating wires wound around the outside of the plurality of heat storage bricks.

[0008] An insulation layer is provided on the inner wall of the heat storage chamber.

[0009] The incineration chamber is equipped with staggered incineration heating wires.

[0010] A protective mechanism is provided on the outside of the heat storage heating wire and the combustion heating wire.

[0011] It also includes a carbon dioxide recovery unit, which is connected to the heat storage chamber via an exhaust pipe.

[0012] The acid removal mechanism includes an acid remover and a fan.

[0013] Temperature sensors are installed in the heat storage chamber and the incineration chamber.

[0014] A support frame is provided at the bottom of the heat storage mechanism.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1. A dedicated cleaning chamber is set up to treat the exhaust gas for acid removal (such as removing acidic gases like HCl), and a gas sensor is equipped to monitor the composition of the exhaust gas in real time. Acid removal prevents acidic substances from corroding the heating wire at the source, extending the lifespan of core components and improving resource utilization. The acid removal equipment deeply purifies the exhaust gas, efficiently removing VOCs containing chlorine, sulfur, and fluorine, as well as dust, preventing these corrosive substances from directly contacting the heating wire surface, further strengthening the protection of the heating wire and reducing equipment maintenance frequency. (To avoid complete overlap with the technical features of existing patents, this utility model adds an acid removal device.)

[0017] 2. High specific heat capacity and high temperature resistance heat storage bricks are used to improve heat exchange efficiency and increase the heat exchange surface area per unit volume. The exhaust gas flows evenly through the heat storage bricks, avoiding local overheating or undercooling. Through the staged heating design, the oxidation and decomposition temperature requirements of different organic compounds such as alkanes, alkenes, and aromatics are precisely matched, making full use of the heat recovered by the heat storage body and reducing system energy consumption. The three-bed heat storage chamber adopts a "heating-cooling-cleaning" cycle mode. Through the independent cleaning stage, the residual exhaust gas in the heat storage chamber is back-blown, and the untreated exhaust gas is pushed to the combustion chamber for secondary oxidation, ensuring the complete decomposition of complex exhaust gas components.

[0018] 3. Replacing traditional gas heating with electric heating wire fundamentally solves the problem of secondary pollution caused by gas combustion (such as avoiding CO production from incomplete combustion); the electric heating wire can achieve precise temperature regulation through an intelligent control system, avoiding the problem of "excessive gas supply causing drastic temperature fluctuations" in gas heating; at the same time, the electric heating wire system does not require a gas supply, eliminating the risk of gas leakage and the explosion hazard caused by improper mixing ratio control, significantly improving operational safety.

[0019] 4. The heating wires in the heat storage chamber and incineration chamber are treated with multiple protective measures (such as corrosion-resistant sleeves and sealed isolation structures). Through physical isolation, the exhaust gas is completely separated from the heating wires, and the corrosion path is blocked from the structure, which significantly extends the service life of the heating wires.

[0020] 5. Add a carbon dioxide recovery device to capture and purify CO2 generated during the waste gas treatment process, so as to realize the recycling of carbon resources (such as for chemical raw materials, food preservation and other fields), which not only creates direct economic value, but also reduces the carbon emissions of the system, which is in line with the "dual carbon" goal. Attached Figure Description

[0021] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the organic waste gas incineration device using an electrically heated heat storage body according to this utility model;

[0023] Figure 2 This is a cross-sectional view of the combustion chamber and heat storage chamber of the organic waste gas incineration device using an electrically heated heat storage body according to this utility model;

[0024] Figure 3 for Figure 2 A magnified view of a portion of the image;

[0025] Figure 4 This is a schematic diagram of the heat storage component structure of the organic waste gas incineration device using an electrically heated heat storage body according to this utility model;

[0026] Figure 5 for Figure 4 A magnified view of a portion of the image;

[0027] Figure 6 This is a schematic diagram illustrating the working principle of the organic waste gas incineration device using an electrically heated heat storage body, as described in this utility model.

[0028] Explanation of reference numerals in the accompanying drawings of this utility model's organic waste gas incineration device using an electrically heated heat storage body:

[0029] Detailed Implementation

[0030] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0031] For ease of description, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified. In this application, unless otherwise explicitly specified and limited, terms such as "installed," "connected," "joined," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] Unless otherwise specified, the terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains, and should be understood to have the meaning consistent with the meaning in the context of the relevant art, and should not be interpreted in an idealized or over-formalized manner, except as expressly defined in this invention.

[0033] like Figures 1-6 As shown, the acid remover 21 of the organic waste gas incineration device using an electrically heated heat storage body of this utility model is located at the outlet end of the fan 22 and adjacent to the front end of the heat storage chamber 10. It is used to remove acidic gases such as HCl, SO2, and fluorides from the waste gas (by alkaline spraying or adsorption); at the same time, it can intercept dust to avoid corrosion of the subsequent heating wire and heat storage body.

[0034] The three heat storage chambers 11 are supported by a support frame 60 (the support frame 60 is used to support the main body of the equipment, ensure structural stability, facilitate pipeline layout and equipment maintenance, and also allow the weight of the equipment to be evenly distributed). The exhaust port 81 at the leftmost end of the bottom of the three heat storage chambers 11 is used to receive the organic waste gas to be treated (including VOCs, acidic gases, dust, etc.) as the input end of the treatment process.

[0035] Three heat storage chambers 10 are arranged below the waste gas incineration chamber 31. Each chamber contains three sets of heat storage components, including a heat storage support 12 and heat storage bricks 13 laid on the support 12. Heat storage heating wires 14 are wound around the outside of the heat storage bricks 13 for heating. The heat storage bricks 13 have a high specific heat capacity and a porous structure, storing waste heat from the incineration chamber 31 and preheating the incoming waste gas (reducing energy consumption). The flue duct 15 structure on the heat storage bricks 13 guides the waste gas to flow evenly, matching the oxidation temperatures of different organic compounds such as alkanes and olefins. In addition, an insulation layer 16 is provided on the inner wall of the heat storage chamber 11 to help maintain the temperature inside the chamber.

[0036] The incineration chamber 31 is located above the three regenerator chambers 10, and the chambers are interconnected. An integrated incineration heating wire 32 is used for heating inside, replacing natural gas and enabling precise temperature control and complete decomposition of VOCs; it also avoids the CO and NO emissions from natural gas combustion. x Secondary pollution, eliminating the risk of gas leaks and explosions.

[0037] The heat storage heating wire 14 and the combustion heating wire 32 are also wrapped with a protective mechanism 33 (such as a corrosion-resistant sleeve or a sealed isolation structure).

[0038] Temperature sensors 40 are also embedded inside the incineration chamber 31 and the heat storage chamber 10, which can monitor the temperature of the incineration chamber 31 and the heat storage chamber 10 in real time; at the same time, the power of the heating wire is adjusted to achieve "precise temperature control in zones" (e.g., 800℃ in the alkane zone and 1000℃ in the aromatic zone).

[0039] In addition, a carbon dioxide recovery unit 50 is installed at the end of the heat storage chamber 10 to capture CO2 in the exhaust gas. After purification, it is used for chemical synthesis, food preservation, etc., to realize carbon resource recycling.

[0040] Core connections and working logic

[0041] Gas circulation (three beds working in tandem, with simultaneous "heating-cooling-cleaning" operation)

[0042] The device achieves three-bed state switching through the control valve group at the bottom of the heat storage chamber 10. At the same time, the three heat storage chambers 10 are in heating state, cooling state, and cleaning state respectively, forming a continuous closed-loop processing flow:

[0043] Heated heat storage chamber 10 (taking the heat storage chamber 10 on the left as an example)

[0044] Gas flow direction: exhaust gas → fan 22 pressurizes → acid remover 21 removes acid gas / dust → exhaust gas pipeline 71 → exhaust gas outlet 81 → left side heat storage chamber 10 (inlet valve 91 is open, purge valve 92 and exhaust valve 93 are closed) → enters exhaust gas incineration chamber 31.

[0045] Core functions: The waste gas absorbs the residual heat stored in the heat storage brick 13 (such as preheating the 200℃ waste gas to 500℃), reducing the energy consumption of the heating wire for heat replenishment; the temperature of the heat storage brick 13 temporarily drops due to heat release (such as dropping from 800℃ to 600℃).

[0046] Cooled heat storage chamber 10 (taking the middle heat storage chamber 10 as an example)

[0047] Gas flow path: High-temperature purified gas (e.g., 1000℃) from the outlet of combustion chamber 31 → intermediate heat storage chamber 10 (exhaust valve 93 is open, inlet valve 91 and purge valve 92 are closed) → discharge port 83 → discharge pipeline 73 → carbon dioxide recovery unit 50.

[0048] Core function: High-temperature gas releases heat to the heat storage brick 13 (the temperature of the heat storage brick 13 rises back to 800℃, storing energy), and cools itself down (e.g., from 1000℃ to 300℃), storing residual heat for subsequent heating.

[0049] Cleaned-up heat storage chamber 10 (taking the heat storage chamber 10 on the right as an example)

[0050] Gas flow direction: Extract purified gas from the outlet of the cooled heat storage chamber 10 (or directly draw tail gas from the low-temperature section of the incineration chamber 31) → purge pipeline 72 → purge port 82 → heat storage chamber 10 on the right (purge valve 92 opens in reverse, inlet valve 91 and exhaust valve 93 are closed) → purge the untreated waste gas remaining on the inner wall and holes of the heat storage chamber 10 in reverse → push to the inlet of the incineration chamber 31 (secondary combustion).

[0051] Core function: Remove residual VOCs (such as benzene and alkane fragments) adhering to the surface of the heat storage brick 13, avoid direct emission of residual waste gas during cycle switching, and ensure that the decomposition rate of complex waste gas is ≥99.9%.

[0052] 2. Periodic switching and coordinated control

[0053] Switching cycle: The valve group is controlled by PLC to complete the state rotation (left heat storage chamber 10 → cooling state, middle heat storage chamber 10 → cleaning state, right heat storage chamber 10 → heating state, and so on), realizing the seamless connection of "heating-cooling-cleaning" of the three beds.

[0054] Valve logic: Each heat storage chamber 10 is equipped with an intake valve 91, an exhaust valve 93, and a purge valve 92. Only the valves in the corresponding states are opened at the same time (e.g., intake valve 91 is opened in the heating state, exhaust valve 93 is opened in the cooling state, and purge valve 92 is opened in the purge state) to prevent cross-contamination of air paths.

[0055] 3. Temperature control and safety linkage (based on integrated heating wire temperature sensor 40)

[0056] Temperature closed-loop control: Temperature sensors 40 of the incineration chamber 31 and each heat storage chamber 10 monitor the temperature in real time. If the preheating temperature of the outlet of the heated heat storage chamber 10 is insufficient, the power of the heating wire is automatically increased. If the residual heat at the outlet of the cooled heat storage chamber 10 is not fully recovered, the cooling time is extended.

[0057] Abnormal trigger cleaning: If the temperature difference inside the heat storage chamber 10 is locally too hot / too cold, the "cleaning state" is forcibly triggered. The temperature dead zone is eliminated by the reverse airflow disturbance to avoid the heat storage brick 13 cracking due to thermal shock.

[0058] Through the gas path design of three-bed synchronous switching + cleaning closed loop, this utility model realizes the whole process of "waste gas pretreatment → staged preheating → electric heating incineration → waste heat recovery → residual gas backflushing" without dead ends, completely solving the defects of traditional RTO such as "residual gas residue and temperature fluctuation". At the same time, by replacing gas with electric heating, it breaks through the technical bottleneck of flammability, explosiveness and secondary pollution.

[0059] The above description of the embodiments is provided to enable those skilled in the art to understand and use the present invention. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. An organic waste gas incineration device using an electrically heated heat storage body, characterized in that, include: A heat storage mechanism, wherein the heat storage mechanism includes a plurality of heat storage chambers; The acid removal mechanism is connected to several heat storage chambers through exhaust gas pipelines and cleaning pipelines; The incineration chamber is located above the heat storage mechanism, and the inner cavity of the incineration chamber is connected to the inner cavities of several heat storage chambers.

2. The organic waste gas incineration device using an electrically heated heat storage body according to claim 1, characterized in that, The heat storage chamber includes: The heat storage chamber is connected to the exhaust gas outlet and purified gas outlet of the acid removal mechanism at its bottom via an exhaust gas pipeline and a cleaning pipeline, respectively. A heat storage assembly, wherein several heat storage assemblies are stacked within the heat storage chamber.

3. The organic waste gas incineration device using an electrically heated heat storage body according to claim 2, characterized in that, The heat storage component includes: A heat storage bracket is disposed in the heat storage chamber; A heat storage brick, several of which are laid on the heat storage support, and a flue is provided inside the heat storage brick; A heat storage heating wire is wound around the outside of several heat storage bricks.

4. The organic waste gas incineration device using an electrically heated heat storage body according to claim 3, characterized in that, An insulation layer is provided on the inner wall of the heat storage chamber.

5. The organic waste gas incineration device using an electrically heated heat storage body according to claim 4, characterized in that, The incineration chamber is equipped with staggered incineration heating wires.

6. The organic waste gas incineration device using an electrically heated heat storage body according to claim 5, characterized in that, A protective mechanism is provided on the outside of the heat storage heating wire and the combustion heating wire.

7. The organic waste gas incineration device using an electrically heated heat storage body according to claim 6, characterized in that, It also includes a carbon dioxide recovery unit, which is connected to the heat storage chamber via an exhaust pipe.

8. The organic waste gas incineration device using an electrically heated heat storage body according to claim 7, characterized in that, The acid removal mechanism includes an acid remover and a fan.

9. The organic waste gas incineration device using an electrically heated heat storage body according to claim 8, characterized in that, Temperature sensors are installed in the heat storage chamber and the incineration chamber.

10. The organic waste gas incineration device using an electrically heated heat storage body according to claim 9, characterized in that, A support frame is provided at the bottom of the heat storage mechanism.

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