Energy-saving rto device

Abstract

The application provides an energy-saving RTO device, which comprises a burning furnace and a waste heat recovery system; the burning furnace comprises a combustion chamber, a plurality of heat storage chambers and a waste gas pipeline; the waste heat recovery system comprises a shell, a heat storage container, a heat storage channel, a first heat extraction channel and a second heat extraction channel; the heat storage container is fixed in the shell, and the heat storage container is filled with a heat storage layer; the heat storage channel penetrates through the heat storage layer, and one end of the heat storage channel is connected with the combustion chamber; the first heat extraction channel and the second heat extraction channel are both arranged on the outer wall of the heat storage container; one end of the first heat extraction channel is connected with the plurality of heat storage chambers respectively, and the other end is connected with the waste gas pipeline; the two ends of the second heat extraction channel are connected with an external heat recovery system respectively and form a loop connection. The application can improve the heat recovery utilization rate of the RTO device when treating waste gas with large fluctuation of concentration, and reduce the operation cost of the RTO device.

Description

Technical Field

[0001] This application belongs to the technical field of waste gas treatment devices, and particularly relates to an energy-saving RTO device. Background Technique

[0002] The regenerative thermal oxidizer (RTO) can oxidize and decompose organic waste gas into CO2 and H2O at high temperature, and at the same time can achieve extremely high heat recovery efficiency through ceramic regenerators. When in use, it can be used alone for the treatment of organic waste gas or combined with other processes, and it is a commonly used efficient treatment facility in current waste gas treatment. In the actual production process, there will be surplus heat generated during the operation of the RTO. For this, the common treatment measure is to equip the RTO with waste heat recovery devices such as air heat exchangers, hot water heat exchangers, and steam waste heat boilers to recycle the waste heat to production. Although the above common waste heat recovery measures can recycle the surplus heat generated during the operation of the RTO to a certain extent, their applicability is greatly affected by the fluctuation of waste gas concentration: when the waste gas concentration at the RTO inlet is relatively high, the waste heat recovery devices supporting the RTO cannot accept too much waste heat, so the excess heat needs to be directly discharged through a high-temperature heat bypass, resulting in a waste of heat; when the waste gas concentration at the RTO inlet is relatively low, the RTO not only cannot supply heat to the waste heat recovery device, but also needs to supplement heat to the RTO through a burner or an electric heater, thus increasing the operating cost. It can be seen that when the existing RTO device treats the situation of large fluctuations in waste gas concentration, its heat recovery utilization rate is relatively low and the operating cost is relatively high. Utility Model Content

[0003] This application aims to solve the technical problems that when the existing RTO device treats the situation of large fluctuations in waste gas concentration, its heat recovery utilization rate is relatively low and the operating cost is relatively high; and proposes an energy-saving RTO device to improve the heat recovery utilization rate of the RTO device when treating waste gas with large fluctuations in concentration, and at the same time reduce the operating cost of the RTO device.

[0004] In order to achieve the above object, this application adopts the following technical solutions:

[0005] An energy-saving RTO device includes an incinerator and a waste heat recovery system;

[0006] The incinerator includes a combustion chamber, a plurality of regenerative chambers, and a waste gas pipeline. The plurality of regenerative chambers are connected in parallel and are all connected to the combustion chamber. The waste gas pipeline is connected to the plurality of regenerative chambers respectively through a plurality of waste gas branch pipes;

[0007] The waste heat recovery system includes a shell, a heat storage container, a heat storage channel, a first heat extraction channel, and a second heat extraction channel. The heat storage container is fixed inside the shell, and a gap is left between the heat storage container and the shell. The heat storage container is filled with a heat storage layer. The heat storage channel runs through the heat storage layer, and one end of the heat storage channel is connected to the combustion chamber to receive excess heat from the combustion chamber. The first heat extraction channel and the second heat extraction channel are both disposed in the gap and are sequentially coiled on the outer wall of the heat storage container. One end of the first heat extraction channel is connected to several heat storage chambers respectively, and the other end is connected to the exhaust gas pipe. Both ends of the second heat extraction channel are connected to an external heat recovery system and form a loop connection.

[0008] Furthermore, each of the aforementioned exhaust gas branch pipes is equipped with an intake switching valve.

[0009] Furthermore, the heat storage layer is formed by filling the heat storage container with heat storage material.

[0010] Furthermore, the structure located within the heat storage layer on the heat storage channel is spiral, serrated, or wavy.

[0011] Furthermore, a first heat storage valve is provided between the heat storage channel and the combustion chamber.

[0012] Furthermore, the RTO device also includes an exhaust stack, and the other end of the heat storage channel is connected to the exhaust stack.

[0013] Furthermore, a second heat storage valve is provided between the heat storage channel and the exhaust pipe.

[0014] Furthermore, a first heat extraction valve is provided between the first heat extraction channel and the exhaust gas pipe.

[0015] Furthermore, a first reuse valve is provided between the first heat extraction channel and each of the heat storage chambers.

[0016] Furthermore, a second heat extraction valve is provided between one end of the second heat extraction channel and the external heat recovery system, and a second recovery valve is provided between the other end of the second heat extraction channel and the external heat recovery system.

[0017] The beneficial effects of this application are:

[0018] This application incorporates a heat storage layer with heat storage function within a waste heat recovery system, along with two heat extraction channels. One of these channels is connected to both ends of an exhaust gas pipeline and a heat storage chamber. This effectively improves the heat recovery efficiency of the RTO device when treating exhaust gases with large concentration fluctuations, while simultaneously reducing the operating costs of the RTO device. Details are as follows:

[0019] The included heat storage layer gives the waste heat recovery system a certain heat storage function. When used in conjunction with the second heat extraction channel, it can handle excess heat generated when the waste gas concentration is high, preventing heat waste and improving the recovery and utilization rate of excess heat. When the waste gas concentration treated by the RTO is low, the second heat extraction channel can be closed and the first heat extraction channel opened. This allows the waste gas to absorb the heat previously stored in the heat storage layer through the first heat extraction channel, further reducing the need for supplemental heat from the RTO using burners or electric heaters, thereby lowering operating costs. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the energy-saving RTO device provided in the embodiments of this application;

[0022] Figure 2 This is a schematic diagram of the internal structure of the waste heat recovery system provided in the embodiments of this application;

[0023] Figure 3 This is a schematic diagram of the internal structure of the heat storage container of the waste heat recovery system provided in the embodiments of this application.

[0024] Explanation of icon numbers:

[0025] Combustion chamber 1, three heat storage chambers 2, exhaust gas pipe 3, exhaust gas branch pipe 3-1, intake switching valve 3-11, shell 4, heat storage container 5, heat storage channel 6, first heat storage valve 6-1, second heat storage valve 6-2, first heat extraction channel 7, first reuse valve 7-1, first heat extraction valve 7-2, second heat extraction channel 8, second heat extraction valve 8-1, second reuse valve 8-2, exhaust stack 9. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0027] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, 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. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0029] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0031] This application provides an energy-saving RTO device, such as... Figure 1 As shown, it includes an incinerator and a waste heat recovery system;

[0032] The incinerator includes a combustion chamber 1, three heat storage chambers 2, an exhaust gas pipe 3, and an exhaust stack 9. The three heat storage chambers 2 are connected in parallel and are all connected to the combustion chamber 1. The exhaust gas pipe 3 is connected to the three heat storage chambers 2 one by one through three exhaust gas branch pipes 3-1. Each exhaust gas branch pipe 3-1 is equipped with an intake switching valve 3-11.

[0033] like Figure 2 and Figure 3 As shown, the waste heat recovery system includes a shell 4, a heat storage container 5, a heat storage channel 6, a first heat extraction channel 7, and a second heat extraction channel 8. The heat storage container 5 is fixed inside the shell 4, and a gap is left between the heat storage container 5 and the shell 4. The heat storage container 5 is filled with a heat storage layer for storing the received heat. The heat storage layer is formed by filling the heat storage container 5 with a heat storage material. The heat storage material can be any heat storage material disclosed in the prior art, but for better heat storage effect, latent heat storage materials, such as paraffin wax, fatty acids, alcohols, and other organic phase change materials, are preferred.

[0034] One end of the heat storage channel 6 is connected to the combustion chamber 1 via a pipe to receive excess heat from the combustion chamber 1; and a first heat storage valve 6-1 is provided on the pipe between the heat storage channel 6 and the combustion chamber 1. Of course, as a precaution, in actual application, a heat exhaust branch pipe (not shown in the figure) can also be provided on the pipe between the heat storage channel 6 and the combustion chamber 1 for direct connection to the exhaust stack 9, and a heat exhaust control valve (not shown in the figure) can be provided on this heat exhaust branch pipe so that when the excess heat in the combustion chamber 1 exceeds the heat that the waste heat recovery system can store (of course, such an extreme situation rarely occurs in actual application), the excess heat can be directly discharged through the heat exhaust branch pipe.

[0035] The heat storage channel 6 extends through the heat storage layer to store the received excess heat. The heat storage channel 6 has a spiral structure within the heat storage layer, which further increases the heat exchange area between the heat storage channel 6 and the heat storage layer, thereby improving the excess heat recovery efficiency. In practical applications, the structure of the heat storage channel 6 within the heat storage layer can also be configured as serrated, wavy, or other structures conventionally used in the prior art that increase the contact area. The other end of the heat storage channel 6 is connected to the exhaust stack 9 to discharge the gas that has completed heat recovery. A second heat storage valve 6-2 is provided between the heat storage channel 6 and the exhaust stack 9.

[0036] Both the first heat extraction channel 7 and the second heat extraction channel 8 are spirally coiled on the outer wall of the heat storage container 5. One end of the first heat extraction channel 7 is connected to each of the three heat storage chambers 2 via a pipe, and a first reuse valve 7-1 is provided on the pipe between the first heat extraction channel 7 and each of the heat storage chambers 2. The other end of the first heat extraction channel 7 is connected to the exhaust gas pipe 3 via a branch pipe, and a first heat extraction valve 7-2 is provided on the branch pipe between the first heat extraction channel 7 and the exhaust gas pipe 3. Both ends of the second heat extraction channel 8 are connected to an external heat recovery system (not shown in the figure) via pipes, forming a loop connection. A second heat extraction valve 8-1 is provided on the pipe between one end of the second heat extraction channel 8 and the external heat recovery system, and a second reuse valve 8-2 is provided on the pipe between the other end of the second heat extraction channel 8 and the external heat recovery system.

[0037] The usage process of the energy-saving RTO device disclosed in this application is briefly described as follows:

[0038] Firstly, the incinerator structure disclosed in the embodiments of this application is a conventional incinerator structure used in the art, and its working principle is also a conventional technical means known to those skilled in the art. Therefore, its specific working process and working principle will not be described in detail here. This section mainly focuses on the detailed description of the working process of the waste heat recovery system when dealing with large fluctuations in exhaust gas concentration:

[0039] When the concentration of exhaust gas treated by the RTO device is high, resulting in a large amount of excess heat in the combustion chamber of the RTO (for example, when the temperature in the combustion chamber is higher than the set 820°C, a corresponding thermometer will be installed in the combustion chamber to monitor its internal temperature, which is a conventional technical means known to those skilled in the art), the first heat storage valve 6-1 and the second heat storage valve 6-2 are opened, allowing the excess heat to enter the heat storage channel 6 to exchange heat with the heat storage layer and store the heat in the heat storage layer (the heat storage material in the heat storage layer absorbs heat and undergoes a phase change to achieve heat storage).

[0040] When the concentration of exhaust gas treated by the RTO unit is low and the heat generated after combustion cannot meet the heat required for subsequent exhaust gas preheating (for example, when the temperature in the combustion chamber is lower than the set 760℃), the intake switching valves 3-11 on the three exhaust gas branch pipes 3-1 are all closed, and the first heat extraction valve 7-2 and the first reuse valve 7-1 corresponding to the heat storage chamber 2 that needs to be vented with exhaust gas are opened at the same time. This allows the exhaust gas that previously needed to be heated through the heat storage chamber 2 to be directly vented into the first heat extraction channel 7 to exchange heat with the heat storage layer to achieve preheating of the exhaust gas. This greatly reduces the need to use an additional burner or electric heater to supplement the heat of the RTO, effectively reducing operating costs.

[0041] Of course, during normal production, if the external heat recovery system needs to use the heat in the heat storage layer, the second heat extraction valve 8-1 and the second recovery valve 8-2 will be opened so that the cold source (such as water or air) of the external heat recovery system can exchange heat with the heat storage layer through the second extraction channel 8.

[0042] The above provides a detailed description of an energy-saving RTO device provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An energy-saving RTO device, comprising an incinerator and a waste heat recovery system; characterized in that: The incinerator includes a combustion chamber, several heat storage chambers, and an exhaust gas pipeline. The heat storage chambers are connected in parallel and are all connected to the combustion chamber. The exhaust gas pipeline is connected to the heat storage chambers one by one through several exhaust gas branch pipes. The waste heat recovery system includes a shell, a heat storage container, a heat storage channel, a first heat extraction channel, and a second heat extraction channel. The heat storage container is fixed inside the shell and is filled with a heat storage layer. The heat storage channel runs through the heat storage layer, and one end of the heat storage channel is connected to the combustion chamber to receive excess heat from the combustion chamber. The first heat extraction channel and the second heat extraction channel are both coiled on the outer wall of the heat storage container. One end of the first heat extraction channel is connected to several heat storage chambers respectively, and the other end is connected to the exhaust gas pipeline. Both ends of the second heat extraction channel are connected to the heat recovery system and form a loop connection.

2. The energy-saving RTO device as described in claim 1, characterized in that: Each of the aforementioned exhaust gas branch pipes is equipped with an intake switching valve.

3. The energy-saving RTO device as described in claim 1, characterized in that: The heat storage layer is formed by filling the heat storage container with heat storage material.

4. The energy-saving RTO device as described in claim 1, characterized in that: The structure located within the heat storage layer on the heat storage channel is spiral, sawtooth, or wavy.

5. The energy-saving RTO device as described in claim 1, characterized in that: A first heat storage valve is provided between the heat storage channel and the combustion chamber.

6. The energy-saving RTO device as described in claim 1, characterized in that: The RTO device also includes an exhaust stack, and the other end of the heat storage channel is connected to the exhaust stack.

7. The energy-saving RTO device as described in claim 6, characterized in that: A second heat storage valve is provided between the heat storage channel and the exhaust stack.

8. The energy-saving RTO device as described in claim 1, characterized in that: A first heat extraction valve is provided between the first heat extraction channel and the exhaust gas pipe.

9. The energy-saving RTO device as described in claim 1, characterized in that: A first reuse valve is provided between the first heat extraction channel and each of the heat storage chambers.

10. The energy-saving RTO device as described in claim 1, characterized in that: A second heat extraction valve is provided between one end of the second heat extraction channel and the heat recovery system, and a second recovery valve is provided between the other end of the second heat extraction channel and the heat recovery system.

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