Organic waste gas catalytic combustion system
By employing a dual adsorption box structure and pipeline regulation technology, the response delay and temperature control lag issues in the desorption cycle of the catalytic combustion system were resolved, enabling rapid desorption and temperature control, and ensuring the safety of the adsorption material and the integrity of catalytic combustion.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG ZHIMAIDE INTELLIGENT TECH CO LTD
- Filing Date
- 2025-08-14
- Publication Date
- 2026-06-30
AI Technical Summary
Existing catalytic combustion systems suffer from response delays and temperature control lags during the desorption cycle, which may lead to problems such as ablation of adsorbent materials and incomplete catalytic combustion.
It adopts a dual adsorption box structure, combined with desorption circulation pipeline, cooling equipment and venting temperature control pipeline, to achieve rapid desorption and temperature control through direct heating and cooling airflow regulation, avoiding ablation of adsorption materials and incomplete catalytic combustion.
It achieves rapid response of desorption cycle and timely temperature control, avoids ablation of adsorbent material and incomplete catalytic combustion, and ensures the high efficiency and stability of catalytic combustion treatment.
Smart Images
Figure CN224434432U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of waste gas treatment technology, and in particular to a catalytic combustion system for organic waste gas. Background Technology
[0002] Industries such as metallurgy, chemical industry, petroleum, waste incineration, and automobile exhaust treatment generate organic waste gas. Direct emission of organic waste gas pollutes the environment and harms human health, requiring harmless treatment. Currently, the most economical and effective treatment method for this type of organic waste gas is catalytic combustion. For example, the catalytic combustion system disclosed in the utility model patent application "CN220546804U" utilizes two adsorption boxes to alternately adsorb organic components in the waste gas. When the adsorption box is saturated, a desorption cycle is initiated, removing the organic components from the adsorption box and allowing them to enter the catalytic bed for catalytic combustion. The gas after catalytic combustion is then recycled back to the corresponding adsorption box for desorption.
[0003] This catalytic combustion system effectively solves the problems of high cost and secondary pollution in organic waste gas treatment, but it still has shortcomings in use, specifically in the following two aspects. First, when starting the desorption cycle, the heat is mainly provided by the electric heater in front of the catalytic bed. When the heated gas flow is output from the catalytic bed, it first passes through a heat exchanger to heat the gas flow output from the adsorption box. As a result, the initial temperature of the gas flow entering the adsorption box is relatively low, and it takes a certain period of time (from a few seconds to more than ten seconds) before significant desorption begins to occur in the adsorption box. There is a certain lag in the desorption process, which prolongs the desorption cycle. Secondly, after a certain period of desorption treatment, the temperature of the desorption circulating gas may become excessively high. To control the temperature of the gas circulating to the adsorption box and prevent it from burning the adsorption material, partial venting is required for temperature control. This involves passively drawing air in from the air supply pipe. However, the drawn-in air first flows through the electric heater and catalytic bed before entering the adsorption box. Before this, some high-temperature gas has already entered the adsorption box, causing a significant lag in temperature control at the adsorption box, which may lead to problems such as ablation of the adsorption material. Moreover, the drawn-in air enters the catalytic bed directly, and due to the influence of ambient temperature, the temperature at the catalytic bed may drop sharply. Although the electric heater will subsequently provide supplementary heating, a brief period of incomplete catalysis will still occur at the catalytic bed. The gas from incomplete catalytic combustion will be released into the atmosphere with the venting air, resulting in exhaust pollution. Therefore, further improvements to the catalytic combustion system are necessary. Utility Model Content
[0004] The technical problem to be solved by this utility model is to provide an organic waste gas catalytic combustion system with fast desorption cycle response, timely desorption temperature control, and the ability to avoid problems such as ablation of adsorbent materials and incomplete catalytic combustion.
[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is: an organic waste gas catalytic combustion system, including two adsorption boxes, the adsorption inlets of the two adsorption boxes are connected to a waste gas input pipe, and the adsorption outlet pipes of the two adsorption boxes are connected to an venting facility; the desorption outlets of the two adsorption boxes are connected to a desorption fan, the outlet pipe of the desorption fan is connected to a catalytic combustion furnace, the outlet of the catalytic combustion furnace is connected to the desorption inlet of the two adsorption boxes by a desorption circulation pipeline, the desorption circulation pipeline is provided with an venting temperature control pipeline connected to the venting facility, and a cooling device is connected upstream of the venting temperature control pipeline on the desorption circulation pipeline; each adsorption box is respectively provided with an adsorption operation control component and a desorption operation control component.
[0006] As a preferred technical solution, the cooling equipment includes a cooling fan with an air outlet connected to the desorption circulation pipeline, and a cooling control valve is provided between the cooling fan and the desorption circulation pipeline.
[0007] As a preferred technical solution, the desorption circulation pipeline is also connected to a hot air circulation pipeline connected to the air inlet of the catalytic combustion furnace, and a hot air circulation control valve is installed on the hot air circulation pipeline.
[0008] As a preferred technical solution, the venting temperature control pipeline is equipped with a venting control valve.
[0009] As a preferred technical solution, the adsorption operation control component includes an adsorption inlet control valve installed at the adsorption inlet of the adsorption box, and an adsorption outlet control valve installed at the adsorption outlet of the adsorption box.
[0010] As a preferred technical solution, the desorption operation control component includes a desorption inlet control valve installed at the desorption inlet of the adsorption box, and a desorption outlet control valve installed at the desorption outlet of the adsorption box.
[0011] As a preferred technical solution, a flame arrester is also connected between the desorption fan and the air inlet of the catalytic combustion furnace.
[0012] As a preferred technical solution, a filter is installed on the exhaust gas inlet pipe.
[0013] Due to the adoption of the above technical solution, the organic waste gas catalytic combustion system includes two adsorption boxes. The adsorption inlets of the two adsorption boxes are connected to a waste gas input pipe, and the adsorption outlet pipes of the two adsorption boxes are connected to an venting facility. The desorption outlets of the two adsorption boxes are connected to a desorption fan, and the outlet pipe of the desorption fan is connected to a catalytic combustion furnace. A desorption circulation pipeline is connected between the outlet of the catalytic combustion furnace and the desorption inlets of the two adsorption boxes. The desorption circulation pipeline is equipped with an venting temperature control pipeline connected to the venting facility, and a cooling device is connected upstream of the venting temperature control pipeline. Each adsorption box is equipped with an adsorption operation control component and a desorption operation control component. When desorption is started, the gas heated at the catalytic combustion furnace can directly enter the adsorption box through the desorption circulation pipeline, and the desorption conditions can be quickly reached in the adsorption box, avoiding the desorption delay problem caused by using a heat exchanger, and the desorption circulation response is fast. When the temperature of the gas after catalytic combustion becomes too high, cold air is directly introduced into the desorption circulation pipeline through the cooling equipment. The cold air is directly mixed into the gas after combustion, which lowers its temperature. At the same time, the supply air and exhaust air volume are balanced by opening the exhaust temperature control pipeline. As a result, the gas entering the adsorption box is kept within the specified temperature range, which helps to avoid ablation of the adsorption material. Moreover, the temperature control process does not affect the normal operation of catalytic combustion, which helps to avoid incomplete catalytic combustion and ensures the catalytic combustion treatment effect. Attached Figure Description
[0014] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the present invention. Wherein:
[0015] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.
[0016] In the diagram: 1-Exhaust gas inlet pipe; 11-Filter; 2-Adsorption box; 21-First adsorption box; 22-Second adsorption box; 23-Adsorption inlet control valve; 24-Adsorption outlet control valve; 25-Desorption inlet control valve; 26-Desorption outlet control valve; 3-Adsorption fan; 4-Desorption fan; 5-Catalytic combustion furnace; 51-Desorption circulation pipeline; 52-Exhaust temperature control pipeline; 53-Exhaust control valve; 54-Hot air circulation pipeline; 55-Hot air circulation control valve; 6-Flame arrester; 7-Cooling equipment; 71-Cooling fan; 72-Cooling control valve; 8-Exhaust facility. Detailed Implementation
[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the following detailed description, only certain exemplary embodiments of the present invention are described by way of illustration. Undoubtedly, those skilled in the art will recognize that various modifications can be made to the described embodiments without departing from the spirit and scope of the present invention. Therefore, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.
[0018] like Figure 1 As shown, the organic waste gas catalytic combustion system includes two adsorption boxes 2. The adsorption boxes 2 are existing technologies with adsorption materials installed inside, and will not be described in detail here. Conventionally, each adsorption box 2 is equipped with an adsorption inlet, an adsorption outlet, a desorption inlet, and a desorption outlet. The adsorption inlet and outlet are used to connect to components related to the adsorption cycle, and the desorption inlet and outlet are used to connect to components related to the desorption cycle.
[0019] Each of the adsorption boxes 2 is equipped with an adsorption operation control component and a desorption operation control component to control whether the adsorption box 2 is connected to the adsorption cycle or the desorption cycle. Conventionally, the adsorption operation control component includes an adsorption inlet control valve 23 installed at the adsorption inlet of the adsorption box 2, and an adsorption outlet control valve 24 installed at the adsorption outlet of the adsorption box 2. When both the adsorption inlet control valve 23 and the adsorption outlet control valve 24 are open, the corresponding adsorption box 2 is connected to the adsorption cycle; conversely, when both are closed, the corresponding adsorption cycle is disconnected from the adsorption box 2. Similarly, the desorption operation control component includes a desorption inlet control valve 25 installed at the desorption inlet of the adsorption box 2, and a desorption outlet control valve 26 installed at the desorption outlet of the adsorption box 2.
[0020] The adsorption inlets of both adsorption boxes 2 are connected to a common exhaust gas inlet pipe 1 to receive organic waste gas. Preferably, a filter 11 is installed on the exhaust gas inlet pipe 1 to filter solid impurities in the organic waste gas. The filter 11 can be configured as needed, such as being set as a three-stage system of coarse filtration, medium filtration, and high filtration, etc., which is not limited here.
[0021] The adsorption outlet pipes of the two adsorption boxes 2 are connected to an venting device 8, which is used to discharge the completely treated gas into the atmosphere. Conventionally, an adsorption fan 3 is provided between the adsorption outlet of the adsorption box 2 and the venting device 8 to provide airflow power for the organic waste gas to flow through the adsorption box 2, thereby improving the adsorption treatment efficiency.
[0022] The desorption outlets of both adsorption boxes 2 are connected to a desorption fan 4, and the outlet pipe of the desorption fan 4 is connected to a catalytic combustion furnace 5. When the desorption cycle is started, the desorption fan 4 operates, allowing the desorbed organic components from the adsorption box 2 to enter the catalytic combustion furnace 5 for catalytic combustion. The catalytic combustion furnace 5 is a known device with an internal heater and catalytic bed, which uses a catalyst to lower the combustion temperature of the organic components, enabling them to undergo catalytic combustion at a catalytic temperature (e.g., 200℃~300℃).
[0023] Conventionally, the catalytic combustion furnace 5 is equipped with a heating temperature detector and a combustion temperature detector. The combustion temperature detector is used to detect the temperature of the gas after catalytic combustion. The detected gas temperature is used to determine whether it will cause ablation of the adsorbent material in the adsorption box 2. That is, controlling the gas after catalytic combustion below a certain temperature can prevent ablation of the adsorbent material in the adsorption box 2. Conventionally, a flame arrester 6 is also connected between the desorption fan 4 and the air inlet of the catalytic combustion furnace 5 to prevent combustion backflow.
[0024] In this embodiment, a desorption circulation pipeline 51 connects the gas outlet of the catalytic combustion furnace 5 to the desorption gas inlets of the two adsorption tanks 2. The desorption circulation pipeline 51 is equipped with a venting temperature control pipeline 52 connected to the venting facility 8. A supplementary cooling device 7 is connected upstream of the venting temperature control pipeline 52 on the desorption circulation pipeline 51. This allows for the rapid establishment of desorption conditions at the adsorption tanks 2 at the initial stage of desorption. Furthermore, if the gas temperature is too high after catalytic combustion, supplementary cooling can be provided by the supplementary cooling device 7 to quickly regulate the gas flow temperature and prevent any impact on catalytic combustion. The specific structural principles described above will be explained in detail later and will not be repeated here. Preferably, the venting temperature control pipeline 52 is equipped with a venting control valve 53 to control the opening and closing of the venting temperature control pipeline 52.
[0025] Preferably, the cooling replenishment device 7 includes a cooling replenishment fan 71 whose air outlet is connected to the desorption circulation pipeline 51. A cooling replenishment control valve 72 is provided between the cooling replenishment fan 71 and the desorption circulation pipeline 51, and the cooling replenishment control valve 72 controls whether the cooling replenishment channel is opened. Of course, a filter structure can be connected to the air inlet of the cooling replenishment fan 71 to prevent impurities in the air from contaminating the system pipeline and equipment.
[0026] Preferably, the desorption circulation pipeline 51 is also connected to a hot air circulation pipeline 54 connected to the air inlet of the catalytic combustion furnace 5. The hot air circulation pipeline 54 is equipped with a hot air circulation control valve 55 to directly use the combustion gas mixed into the desorption gas to further increase the initial catalytic temperature of the desorption gas.
[0027] The specific working principle of this embodiment is as follows, and for ease of explanation, the two adsorption boxes 2 are defined as the first adsorption box 21 and the second adsorption box 22, respectively.
[0028] Initially, the adsorption inlet control valve 23 and adsorption outlet control valve 24 at the first adsorption box 21 are open, while the desorption inlet control valve 25 and desorption outlet control valve 26 are closed, and the first adsorption box 21 is connected to the adsorption cycle. At the second adsorption box 22, the adsorption inlet control valve 23 and adsorption outlet control valve 24 are open, while the desorption inlet control valve 25 and desorption outlet control valve 26 are all closed. The adsorption fan 3 is turned on, and the organic waste gas input through the waste gas input pipe 1, after being filtered by the filter 11, enters the first adsorption box 21, where the organic components are adsorbed by the adsorption material in the first adsorption box 21, and no waste gas is output to the venting facility 8 for venting.
[0029] After the first adsorption tank 21 becomes saturated with adsorption, its adsorption inlet control valve 23 and adsorption outlet control valve 24 are closed, while its desorption inlet control valve 25 and desorption outlet control valve 26 are opened, and the first adsorption tank 21 is connected to the desorption cycle. Meanwhile, the adsorption inlet control valve 23 and adsorption outlet control valve 24 at the second adsorption tank 22 are opened, while the desorption inlet control valve 25 and desorption outlet control valve 26 remain closed, and the second adsorption tank 22 takes over from the first adsorption tank 21 to connect to the adsorption cycle and continue to adsorb and treat the input organic waste gas.
[0030] The desorption fan 4 and catalytic combustion furnace 5 are turned on. The heater inside the catalytic combustion furnace 5 heats the gas flow to 170°C–180°C. Driven by the desorption fan 4, the gas flow directly enters the first adsorption box 21 through the desorption circulation pipeline 51. The first adsorption box 21 can quickly reach the desorption conditions, such as 90°C–120°C, avoiding the desorption delay problem caused by using a heat exchanger, and the desorption cycle response is fast. The desorbed gas containing the desorbed organic components enters the catalytic combustion furnace 5 for catalytic combustion via the desorption fan 4 and the flame arrester 6.
[0031] As the heater inside the catalytic combustion furnace 5 heats the gas and the organic components undergo catalytic combustion, the temperature of the desorption circulating gas gradually increases. Based on the detection of the combustion temperature detector at the catalytic combustion furnace 5, the power input of the heater inside the catalytic combustion furnace 5 is gradually reduced to achieve the purpose of desorption circulating temperature control and reduce energy consumption. Furthermore, when the combustion temperature detector detects a certain temperature value, such as 210°C, the hot air circulation control valve 55 is opened. Part of the combusted gas returns to the air inlet of the catalytic combustion furnace 5 through the hot air circulation pipe 54, mixing with the desorbed gas. This ensures that the desorbed gas maintains a relatively high initial temperature when entering the catalytic combustion furnace 5, ensuring complete catalytic combustion and further reducing the heater input power, thus reducing energy consumption. Meanwhile, due to the diversion of the hot air circulation pipe 54, the airflow entering the first adsorption box 21 through the desorption circulation pipe 51 is reduced. Also, based on the certain heat loss at the desorption circulation pipe 51, even if the gas temperature after combustion at the catalytic combustion furnace 5 reaches the aforementioned 210°C, the temperature of the part of the airflow that reaches the first adsorption box 21 can still be guaranteed to be below 120°C, thus avoiding the ablation of the adsorption material. At the same time, because the airflow is slowed down, the contact between the airflow and the adsorption material is more sufficient, which can further promote the thorough desorption.
[0032] When the organic content in the desorbed gas is high, the temperature of the post-combustion gas may become excessively high, reaching as high as 230°C. In this case, the hot air circulation control valve 55 is closed, and the supplementary cooling device 7 and the exhaust control valve 53 are opened. The supplementary cooling device 7 directly blows cold air into the post-combustion gas to lower its temperature. Simultaneously, the opening of the exhaust temperature control pipeline 52 balances the supplementary and exhaust air volumes, thereby ensuring that the gas entering the adsorption box 2 remains within the required temperature range. Then, the supplementary cooling device 7 and the exhaust control valve 53 are closed, and the desorption cycle returns to the same operating state as when the initial desorbed gas begins catalytic combustion. When the temperature rises, the same process of opening the hot air circulation control valve 55 or performing supplementary cooling is repeated. Throughout the entire process, the path from the first adsorption box 21 to the catalytic combustion furnace 5 is not affected by supplementary cooling, allowing catalytic combustion to maintain normal operation, which helps avoid incomplete catalytic combustion and ensures the effectiveness of catalytic combustion treatment.
[0033] As desorption and catalytic combustion continue, the amount of organic components adsorbed in the first adsorption box 21 gradually decreases, and the temperature of the combustion gas in the catalytic combustion furnace 5 decreases. The heater input power is increased based on the detected temperature to maintain the catalytic combustion temperature. After the desorption cycle reaches the set time, the organic components adsorbed in the first adsorption box 21 have been essentially catalytically combusted. At this point, the heater in the catalytic combustion furnace 5 stops heating, the cooling device 7 and the venting control valve 53 are opened, and the desorption fan 4 continues to run. A large amount of cold air is mixed into the desorption cycle to cool the first adsorption box 21 until it reaches room temperature. Then, the cooling device 7, the venting control valve 53, the desorption fan 4, and the adsorption inlet control valve 23 and the adsorption outlet control valve 24 at the first adsorption box 21 are closed.
[0034] Once the second adsorption chamber 22 is saturated with adsorption, its adsorption inlet control valve 23 and adsorption outlet control valve 24 are closed, while its desorption inlet control valve 25 and desorption outlet control valve 26 are opened to initiate the aforementioned desorption and catalytic combustion process. Meanwhile, the adsorption inlet control valve 23 and adsorption outlet control valve 24 at the first adsorption chamber 21 are opened, taking over the adsorption cycle from the second adsorption chamber 22. This alternating operation continues continuously.
[0035] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. An organic waste gas catalytic combustion system, comprising two adsorption boxes, wherein the adsorption inlets of the two adsorption boxes are connected to a common waste gas input pipe, and the adsorption outlet pipes of the two adsorption boxes are connected to an venting facility; the desorption outlets of the two adsorption boxes are connected to a common desorption fan, and the outlet pipe of the desorption fan is connected to a catalytic combustion furnace, characterized in that: A desorption circulation pipeline is connected between the gas outlet of the catalytic combustion furnace and the desorption gas inlet of the two adsorption boxes. The desorption circulation pipeline is provided with an venting temperature control pipeline connected to the venting facility. A cooling device is connected to the desorption circulation pipeline upstream of the venting temperature control pipeline. Each adsorption box is provided with an adsorption operation control component and a desorption operation control component.
2. The catalytic combustion system for organic waste gas as described in claim 1, characterized in that: The cooling equipment includes a cooling fan whose air outlet is connected to the desorption circulation pipeline, and a cooling control valve is provided between the cooling fan and the desorption circulation pipeline.
3. The catalytic combustion system for organic waste gas as described in claim 1, characterized in that: The desorption circulation pipeline is also connected to a hot air circulation pipeline connected to the air inlet of the catalytic combustion furnace, and a hot air circulation control valve is installed on the hot air circulation pipeline.
4. The catalytic combustion system for organic waste gas as described in claim 1, characterized in that: The venting temperature control pipeline is equipped with a venting control valve.
5. The catalytic combustion system for organic waste gas as described in claim 1, characterized in that: The adsorption operation control component includes an adsorption inlet control valve installed at the adsorption inlet of the adsorption box and an adsorption outlet control valve installed at the adsorption outlet of the adsorption box.
6. The catalytic combustion system for organic waste gas as described in claim 1, characterized in that: The desorption operation control component includes a desorption inlet control valve installed at the desorption inlet of the adsorption box and a desorption outlet control valve installed at the desorption outlet of the adsorption box.
7. The catalytic combustion system for organic waste gas as described in claim 1, characterized in that: A flame arrester is also connected between the desorption fan and the air inlet of the catalytic combustion furnace.
8. The catalytic combustion system for organic waste gas as described in claim 1, characterized in that: A filter is installed on the exhaust gas inlet pipe.