Flexible operation system for VOCs waste gas treatment and its treatment method

Abstract

The present invention relates to the technical field of ship spraying waste gas treatment, and in particular to a flexible operation system for VOCs waste gas treatment and its treatment method. The flexible operation system for VOCs waste gas treatment includes: a waste gas conveying unit, a waste gas treatment unit, and a waste heat utilization unit that are connected in sequence. The waste gas treatment unit includes a heat energy conversion component, a detection component for detecting the concentration and wind pressure of the gas, and multiple groups of waste gas treatment components arranged in parallel. The heat energy conversion component is respectively connected to the zeolite rotor and the RTO combustion equipment. Part of the high-temperature flue gas generated by the combustion of the RTO combustion equipment is conveyed to the heat energy conversion component to perform heat exchange on the gas conveyed by the zeolite rotor to the heat energy conversion component. The waste heat utilization unit is connected to the RTO combustion equipment. The present invention can efficiently treat the waste gas generated during the ship painting process, recycle the heat energy generated during the waste gas combustion process, and realize a flexible operation system for VOCs waste gas treatment with the most economical operation through the detection of concentration and wind pressure.

Description

Technical Field

[0001] The present invention relates to the technical field of ship spraying waste gas treatment, and particularly relates to a flexible operation system for VOCs waste gas treatment and a treatment method thereof. Background Art

[0002] Volatile Organic Compounds (VOCs) mainly come from fuel combustion, vehicle exhaust, emissions of paints, coatings, organic solvents, etc., and will cause harm to the human body and the environment. China has become a major global shipbuilding country, with a continuous leading position in the international market share. In the shipbuilding process, paint spraying is the most polluting link to the environment. Generally, the volatile organic compounds generated in a painting workshop are mainly volatilized from paints and curing agents, and the main components include benzene series (benzene, toluene, xylene, etc.) and alcohol compounds. Such substances seriously restrict the sustainable development of human society and threaten the natural environment on which humans depend for survival. According to relevant regulations, air pollutants must be discharged up to standard, and the organic waste gas generated during the sectional painting operation in the shipbuilding industry should be discharged to a VOCs waste gas treatment device for treatment. Currently, the VOCs waste gas generated in the painting workshop has the characteristics of complex composition, large quantity, high concentration and instability, and the concentrated catalytic combustion method has become the mainstream technology for VOCs treatment.

[0003] At present, in the painting workshops of the shipbuilding industry, basically one set of VOCs waste gas treatment device is configured for each bay, and the main process adopted is dry pre-filter + zeolite wheel adsorption concentration + RTO (regenerative thermal oxidizer) combustion. After the organic waste gas discharged after spraying paint in the painting workshop passes through the dry pre-filter, it enters the zeolite wheel for adsorption and concentration. The organic waste gas can meet the emission standards after being treated by zeolite adsorption. At the same time, the highly concentrated organic waste gas attached to the zeolite is desorbed online by the heated air, and the desorbed concentrated organic waste gas enters the backend RTO furnace for combustion treatment. This treatment process can effectively harmlessly treat the discharged VOCs, but a large amount of external energy is required for the concentration, desorption, and combustion links in this method. The organic waste gas generated by the painting operation is a hydrocarbon combustible mixture composed of benzene series and alcohol compounds. To ensure the complete combustion of the organic waste gas in the RTO (regenerative thermal oxidizer), the temperature in the furnace chamber needs to be higher than the auto-ignition temperature of each component. In 2020, HJ1093-2020 "Technical Specification for Industrial Organic Waste Gas Treatment Engineering by Regenerative Combustion Method" was promulgated, which stipulates that the combustion temperature in the furnace chamber of the RTO equipment during operation should not be lower than 760 °C, and the temperature is above 800 °C during the actual treatment process. When the VOCs waste gas treatment device operates without load, the no-load furnace chamber temperature of the RTO is set at 760 °C, and the temperature is mainly maintained by the combustion of auxiliary fuel natural gas. At this time, the consumption of natural gas is relatively large; when there is a painting operation condition in the painting workshop, the content of organic matter entering the furnace chamber through concentration and desorption will increase and participate in combustion. At this time, the furnace chamber temperature will rise, and the consumption of natural gas will be reduced accordingly. When the furnace chamber temperature reaches 830 °C, the supply of natural gas will be completely cut off.

[0004] Based on the relevant requirements of environmental protection regulations and combined with the particularity of painting operations and the disadvantage of long preheating and cooling times of the RTO furnace, all VOCs waste gas treatment devices in the current painting workshops are basically in a 24-hour full-open operation state, consuming a large amount of electric energy and natural gas, and the operating cost is very high. The high-temperature flue gas generated during the combustion of organic waste gas by the RTO contains a large amount of thermal energy but is not recovered and utilized, and is directly discharged, wasting a large amount of thermal energy in vain. Summary of the Invention

[0005] In view of this, the purpose of this application is to provide a flexible operation system for VOCs waste gas treatment and its treatment method to solve the problems that the existing VOCs waste gas treatment method in painting workshops is single and uncontrollable, with high operating costs, and the waste of thermal energy generated during the combustion process.

[0006] The first aspect of the present invention provides a flexible operation system for VOCs waste gas treatment, which is used to treat the gas generated in a painting workshop. Among them, the flexible operation system for VOCs waste gas treatment includes a waste gas transportation unit, a waste gas treatment unit, and a waste heat utilization unit that are connected in sequence:

[0007] The waste gas treatment unit includes a heat energy conversion component, a detection component, and multiple groups of waste gas treatment components arranged in parallel; each group of the waste gas treatment components is connected to a plurality of the waste gas conveying units, and each of the waste gas conveying units can convey the gas to at least one of the waste gas treatment components. The detection component is used to detect the concentration and wind pressure of the gas.

[0008] The waste gas treatment component includes a zeolite rotor and an RTO combustion device that communicate with each other; the heat energy conversion component is respectively communicated with the zeolite rotor and the RTO combustion device. Part of the high-temperature flue gas generated by the combustion of the RTO combustion device is conveyed to the heat energy conversion component to perform heat exchange on the gas conveyed from the zeolite rotor to the heat energy conversion component. After heat exchange, the temperature of the gas rises and is conveyed back to the zeolite rotor through the heat energy conversion component for thermal desorption.

[0009] A waste heat utilization unit, which is communicated with the RTO combustion device. The waste heat utilization unit includes a heat exchange component, and part of the high-temperature flue gas is introduced into the heat exchange component to heat the medium in the heat exchange component.

[0010] Preferably, the heat energy conversion component includes a desorption cold path and a desorption heat path; the desorption cold path is communicated with the zeolite rotor of the waste heat utilization unit, and the desorption heat path is respectively communicated with the RTO combustion device and the waste heat utilization unit.

[0011] Preferably, the VOCs waste gas treatment flexible operation system further includes:

[0012] A hybrid component, which is arranged between the waste gas treatment unit and the waste heat utilization unit and is used to mix the high-temperature flue gas discharged from the heat path and the high-temperature flue gas discharged from at least one of the RTO combustion devices.

[0013] Preferably, each group of the waste gas treatment components further includes:

[0014] A first on-off valve, which is arranged upstream of the zeolite rotor along the flowing direction of the gas;

[0015] A second on-off valve, which is arranged between the heat energy conversion component and the zeolite rotor;

[0016] A third on-off valve, which is arranged between the zeolite rotor and the RTO combustion device;

[0017] A fourth on-off valve, which is arranged between the RTO combustion device and the heat energy conversion component;

[0018] A fifth on-off valve, which is arranged between the RTO combustion device and the waste heat utilization unit.

[0019] Preferably, each group of the waste gas treatment components further includes:

[0020] A first fan, which is arranged upstream of the first on-off valve along the flowing direction of the gas;

[0021] A second fan, which is arranged between the zeolite rotor and the heat energy conversion component;

[0022] A third fan, which is arranged between the zeolite rotor and the fourth on-off valve;

[0023] A first communication pipe is arranged between the first fan and the first on-off valve, and multiple zeolite rotors are connected in parallel through the first communication pipe. Each first fan can convey the gas to at least one zeolite rotor; a second communication pipe is arranged between the third fan and the fourth on-off valve, and multiple RTO combustion devices are connected in parallel through the second communication pipe. Each third fan can convey the gas to at least one RTO combustion device.

[0024] Preferably, the detection component includes:

[0025] A first detection component, which is connected to the first communication pipe; the first detection component is in communication connection with multiple first on-off valves;

[0026] A second detection component, which is connected to the second communication pipe; the second detection component is in communication connection with multiple fourth on-off valves.

[0027] Preferably, the VOCs waste gas treatment flexible operation system further includes:

[0028] A pretreatment unit, which is arranged between the waste gas conveying unit and the waste gas treatment unit.

[0029] Preferably, the heat exchange component includes a gas heat exchange component and a liquid heat exchange component;

[0030] The gas heat exchange component includes an air heat exchange element and a gas supply element. The air heat exchange element has an air cold path and an air hot path capable of heat exchange, and the gas supply element is communicated with the air cold path; the air hot path is communicated with the waste gas treatment unit;

[0031] The liquid heat exchange component includes a hot water heat exchange element and a water supply element. The hot water heat exchange element has a hot water cold path and a hot water hot path capable of heat exchange, and the water supply element is communicated with the hot water cold path, and the hot water hot path is communicated with the waste gas treatment unit.

[0032] Preferably, the air cold path is communicated with the painting workshop for heating the painting workshop to accelerate the paint curing speed;

[0033] The hot water cold process passage is communicated with the water storage tank.

[0034] The second aspect of the present invention provides a treatment method for a flexible operation system for VOCs waste gas treatment, which is applied to the VOCs waste gas treatment flexible operation system described in any of the above technical solutions. The painting workshop is used for spraying ships, and spraying ships includes painting and curing.

[0035] The painting work includes overall spraying, touch-up spraying and roller coating.

[0036] Curing includes a pre-curing state, a mid-curing state and a post-curing state.

[0037] In different painting works or curing states, the concentration and air pressure of the gas transported by the waste gas transportation unit are different. The VOCs waste gas treatment flexible operation system turns on at least one of the zeolite rotors and the RTO combustion equipment according to the concentration and air pressure of the gas to treat the gas.

[0038] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0039] (1) The VOCs waste gas treatment flexible operation system of the present invention optimizes the pipelines and control systems of multiple sets of independent waste gas treatment components, and integrates the waste gas treatment components in multiple bays of the painting workshop into a flexible operation VOCs waste gas treatment system that can automatically switch different numbers of zeolite rotors and different numbers of RTO combustion equipment according to different operating conditions in multiple bays and the concentration of VOC organic waste gas, so as to meet the requirements of different painting operation plans. It changes the situation that the existing VOCs waste gas treatment device is fully open for 24 hours, greatly saves the consumption of electric energy and natural gas, and reduces the operation cost of the VOCs waste gas treatment system.

[0040] (2) The present invention uses a heat energy conversion component to exchange heat between the cold process air and the high-temperature flue gas discharged from the RTO combustion equipment, and then sends it to the zeolite rotor for thermal desorption of the concentrated organic waste gas, replacing the existing electric heating desorption method, greatly reducing the electric energy consumption and saving the energy cost expenditure.

[0041] (3) The present invention circularly recovers and reuses the heat energy generated during the combustion process, realizes flexible switching of heat exchange of multiple substances through a combined heat exchange component, realizes heating the air in the painting workshop by air heat exchange and / or providing hot water for the bathroom by hot water heat exchange, replacing the original method of heating the air in the painting workshop by steam, and greatly reducing the consumption and cost of purchased steam.

[0042] To make the above objects, features and advantages of the present application more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, is described in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0044] Figure 1 It is a schematic diagram of the VOCs waste gas treatment flexible operation system provided in the first embodiment of the present invention.

[0045] Reference numerals: 100 - pretreatment unit; 20 - heat energy conversion component; 21 - conversion cold - process inlet; 22 - conversion cold - process outlet; 23 - conversion hot - process inlet; 24 - conversion hot - process outlet; 31 - first concentration detector; 32 - first air pressure detector; 33 - second concentration detector; 34 - second air pressure detector; 40 - zeolite rotor; 41 - air inlet; 42 - desorption outlet; 43 - desorption inlet; 44 - air outlet; 50 - RTO combustion equipment; 61 - first on - off valve; 62 - second on - off valve; 63 - third on - off valve; 64 - fourth on - off valve; 65 - fifth on - off valve; 66 - first fan; 67 - second fan; 68 - third fan; 70 - hybrid component; 81 - first connecting pipe; 82 - second connecting pipe; 90 - air heat exchanger; 901 - air cold - process inlet; 902 - air cold - process outlet; 903 - first gas hot - process inlet; 904 - first gas hot - process outlet; 91 - air supply component; 92 - hot water heat exchanger; 921 - hot water cold - process inlet; 922 - hot water cold - process outlet; 923 - second gas hot - process inlet; 924 - second gas hot - process outlet; 93 - water supply component; 200 - painting workshop; 300 - water storage tank; 400 - chimney. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0046] The following detailed embodiments are provided to assist the reader in obtaining a comprehensive understanding of the methods, devices, and / or systems described herein. However, after understanding the disclosure of this application, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be apparent. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein. Rather, except for operations that must occur in a specific order, changes will be apparent after understanding the disclosure of this application. In addition, for the sake of clarity and brevity, descriptions of features known in the art may be omitted.

[0047] The features described herein can be implemented in various forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many possible ways of implementing the methods, devices, and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0048] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "coupled to" another element, "above" another element, or "covering" another element, it can be directly "on" another element, "connected to" another element, "coupled to" another element, "above" another element, or "covering" another element, or there can be one or more other elements intervening therebetween. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly coupled to" another element, "directly above" another element, or "directly covering" another element, there can be no other elements intervening therebetween.

[0049] As used herein, the term "and / or" includes any one of the listed related items and any combination of any two or more of them.

[0050] Although terms such as "first", "second", and "third" may be used herein to describe various components, elements, regions, layers, or parts, these components, elements, regions, layers, or parts are not limited by these terms. Rather, these terms are only used to distinguish one component, element, region, layer, or part from another. Thus, a first component, element, region, layer, or part referred to in the examples described herein may also be referred to as a second component, element, region, layer, or part without departing from the teachings of the examples.

[0051] For ease of description, spatial relationship terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another as shown in the figures. Such spatial relationship terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as "above" or "upper" relative to another element will then be "below" or "lower" relative to the other element. Thus, the term "above" includes both the orientations of "above" and "below" depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relationship terms used herein will be interpreted accordingly.

[0052] The terms used herein are for describing various examples only and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. The terms "comprising", "including" and "having" enumerate the stated features, quantities, operations, components, elements and / or combinations thereof that exist, but do not preclude the existence or addition of one or more other features, quantities, operations, components, elements and / or combinations thereof.

[0053] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Accordingly, the examples described herein are not limited to the specific shapes shown in the drawings, but include changes in shape that occur during manufacturing.

[0054] The features of the examples described herein can be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible, as will be apparent after understanding the disclosure of the present application.

[0055] According to the present invention, there is provided a flexible operation system for treating VOCs waste gas, which includes a waste gas conveying unit, a waste gas treatment unit, and a waste heat utilization unit.

[0056] Hereinafter, the specific structures of the above components of the flexible operation system for treating VOCs waste gas according to the present embodiment will be described.

[0057] In the present embodiment, as Figure 1 shown, the flexible operation system for treating VOCs waste gas is used to treat the gas generated by the painting workshop 200. The waste gas conveying unit is connected to the painting workshop 200 and is arranged in one-to-one correspondence. Along the conveying direction of the gas through the waste gas conveying unit, the waste gas conveying unit, the waste gas treatment unit, and the waste heat utilization unit are connected in sequence.

[0058] Specifically, the waste gas treatment unit includes a heat energy conversion member 20, a detection assembly, and a plurality of groups of waste gas treatment assemblies arranged in parallel; each group of waste gas treatment assemblies is connected to a plurality of waste gas conveying units, so that each waste gas conveying unit can convey the gas to at least one waste gas treatment assembly. The detection assembly is used to detect the concentration and wind pressure of the gas. In this way, the concentration and wind pressure conditions of the gas conveyed by each group of waste gas conveying units can be determined, and the gas can be conveyed to one or more waste gas treatment assemblies, thereby improving the gas treatment efficiency, avoiding the situation where each device in the waste gas treatment system is fully open for 24 hours, saving energy consumption, and reducing the operation cost of waste gas treatment.

[0059] In the present embodiment, as Figure 1As shown in the figure, the waste gas treatment component includes a zeolite rotor 40 and an RTO combustion device 50 that are communicated with each other; a heat energy conversion component 20 is respectively communicated with the zeolite rotor 40 and the RTO combustion device 50. Part of the high-temperature flue gas generated by the combustion of the RTO combustion device 50 is transported to the heat energy conversion component 20 to perform heat exchange on the gas transported from the zeolite rotor 40 to the heat energy conversion component 20. The temperature of the gas after heat exchange increases and is transported back to the zeolite rotor 40 through the heat energy conversion component 20 for thermal desorption. In this way, the heat energy generated by the combustion of the RTO combustion device 50 is used to replace the existing desorption method of electric heating, greatly reducing the power consumption and saving the energy cost.

[0060] Specifically, in this embodiment, as Figure 1 shown, the heat energy conversion component 20 includes a desorption cold path and a desorption hot path, and the desorption cold path and the desorption hot path can perform heat exchange; the desorption cold path is communicated with the zeolite rotor 40, and the desorption hot path is respectively communicated with the RTO combustion device 50 and the waste heat utilization unit. In this way, the high-temperature flue gas from the RTO combustion device 50 leading to the desorption hot path exchanges heat with the gas in the desorption cold path led by the zeolite rotor 40, and the gas with increased temperature after heat exchange is transported back into the zeolite rotor 40 again. In this embodiment, the heat energy conversion component 20 can be selected as a heat exchanger that can transfer part of the heat of the hot fluid to the cold fluid.

[0061] More specifically, in this embodiment, as Figure 1 shown, the input end of the desorption cold path in the heat energy conversion component 20 is formed as a conversion cold path inlet 21, the output end of the desorption cold path is formed as a conversion cold path outlet 22, the input end of the desorption hot path in the heat energy conversion component 20 is formed as a conversion hot path inlet 23, and the output end of the desorption hot path is formed as a conversion hot path outlet 24. The zeolite rotor 40 includes an air inlet 41, a desorption inlet 43, a desorption outlet 42, and an air outlet 44. Among them, the air inlet 41 is communicated with the waste gas transportation unit, and the desorption outlet 42 is communicated with the conversion cold path inlet 21.

[0062] It should be noted that in this embodiment, only one heat energy conversion component 20 needs to be provided, and the heat energy conversion component 20 is respectively connected to the zeolite rotor 40 in each group of waste gas treatment components.

[0063] In addition, in this embodiment, as Figure 1As shown, each group of waste gas treatment components further includes a first on-off valve 61, a second on-off valve 62, a third on-off valve 63, a fourth on-off valve 64, and a fifth on-off valve 65. Specifically, along the gas flow direction, the first on-off valve 61 is arranged upstream of the zeolite rotor 40 to control the activation of the zeolite rotor 40; the second on-off valve 62 is arranged between the heat energy conversion component 20 and the zeolite rotor 40 to control the on-off of the desorption outlet 42 and the conversion cold process inlet 21; the third on-off valve 63 is arranged between the zeolite rotor 40 and the RTO combustion device 50 to control the delivery of the gas (organic waste gas) that needs to be combusted from the zeolite rotor 40 to the RTO combustion device 50; the fourth on-off valve 64 is arranged between the RTO combustion device 50 and the heat energy conversion component 20 to deliver a part of the high-temperature flue gas generated by the RTO combustion device 50 into the desorption heat process path to control the activation of the heat exchange of the heat energy conversion component 20; the fifth on-off valve 65 is arranged between the RTO combustion device 50 and the waste heat utilization unit to supply a part of the high-temperature flue gas generated by the RTO combustion device 50 to be applied in the waste heat utilization unit.

[0064] More specifically, the first on-off valve 61, the second on-off valve 62, the third on-off valve 63, the fourth on-off valve 64, and the fifth on-off valve 65 are preferably formed as electric valves to achieve automatic opening or closing, so that one or more groups of waste gas treatment components can be automatically opened according to the requirements of waste gas treatment.

[0065] In addition, in this embodiment, as Figure 1 shown, each group of waste gas treatment components further includes a first fan 66, a second fan 67, and a third fan 68 to achieve the supply and transportation of gas in the system; specifically, along the gas flow direction, the first fan 66 is arranged upstream of the first on-off valve 61; the second fan 67 is arranged between the zeolite rotor 40 and the heat energy conversion component 20; the third fan 68 is arranged between the zeolite rotor 40 and the fourth on-off valve 64.

[0066] Furthermore, a first connecting pipe 81 is arranged between the first fan 66 and the first on-off valve 61, and multiple zeolite rotors 40 are connected in parallel through the first connecting pipe 81. Each first fan 66 can deliver gas to at least one zeolite rotor 40, so that one or more zeolite rotors 40 can be opened according to the gas concentration and wind pressure for treatment; a second connecting pipe 82 is arranged between the third fan 68 and the fourth on-off valve 64, and multiple RTO combustion devices 50 are connected in parallel through the second connecting pipe 82. Each third fan 68 can deliver gas to at least one RTO combustion device 50, so that one or more RTO combustion devices 50 can be opened according to the gas concentration and wind pressure for treatment.

[0067] Further, the detection assembly includes a first detection assembly connected to the first communication pipe 81 and a second detection assembly connected to the second communication pipe 82. The first detection assembly and the second detection assembly respectively include a concentration analyzer and a pressure transmitter to achieve the detection of gas concentration and wind pressure. In this embodiment, the first detection assembly includes a first concentration detection component 31 and a first wind pressure detection component 32, and the second detection assembly includes a second concentration detection component 33 and a second wind pressure detection component 34. Among them, both the first concentration detection component 31 and the second concentration detection component 33 can be selected as FID testers, and both the first wind pressure detection component 32 and the second wind pressure detection component 34 can be selected as anemometers.

[0068] In this embodiment, as Figure 1 shown, the first detection assembly is communicatively connected to a plurality of first on-off valves 61, so that one or more first on-off valves 61 can be opened according to the parameters detected by the first detection assembly to control one or more zeolite rotors 40 to process waste gas; the second detection assembly is communicatively connected to a plurality of fourth on-off valves 64, so that one or more fourth on-off valves 64 can be opened according to the parameters detected by the second detection assembly to control one or more RTO combustion devices 50 to burn the gas.

[0069] Specifically, the VOCs waste gas treatment flexible operation system is also provided with a PLC control unit for controlling the entire VOCs waste gas treatment flexible operation system. Thus, according to the detection parameters fed back by the detection assembly, the waste gas treatment equipment of the corresponding on-off valve is automatically opened, and it is automatically put into the waste gas treatment work, so as to achieve flexible control and make the VOCs waste gas treatment flexible operation system operate most efficiently and economically.

[0070] In addition, in this embodiment, as Figure 1 shown, the VOCs waste gas treatment flexible operation system further includes a pretreatment unit 100 arranged between the waste gas conveying unit and the waste gas treatment unit. The pretreatment unit 100 is a filtering device, so that the gas conveyed by the waste gas conveying unit can be primarily filtered.

[0071] In this embodiment, as Figure 1 shown, the waste heat utilization unit is connected to the RTO combustion device 50 to utilize the high-temperature flue gas generated by the RTO combustion device 50 to avoid a large amount of heat energy waste. Specifically, the waste heat utilization unit includes a heat exchange assembly, and part of the high-temperature flue gas is introduced into the heat exchange assembly to heat the medium in the heat exchange assembly.

[0072] Further, in this embodiment, as Figure 1As shown in the figure, the heat exchange assembly includes a gas heat exchange assembly and a liquid heat exchange assembly, so that the waste heat utilization unit can output hot water and hot gas; specifically, the gas heat exchange assembly includes an air heat exchanger 90 and an air supply component 91. The air heat exchanger 90 has an air cold path and a first heat path that can conduct heat exchange. The air supply component 91 is connected to the input end of the air cold path; the air supply component 91 can be a gas pump or a fan, which is used to suck external air into the air cold path. The input end of the first heat path is connected to the waste gas treatment unit. The high-temperature flue gas generated by the RTO combustion device 50 can be input into the first heat path, and heat exchange is used to heat the air sucked into the first cold path by the air supply component 91, so that the first cold path can output hot gas; the liquid heat exchange assembly includes a hot water heat exchanger 92 and a water supply component 93. The hot water heat exchanger 92 has a hot water cold path and a second heat path that can conduct heat exchange. The water supply component 93 is connected to the input end of the hot water cold path. The water supply can be a water pump to transport tap water into the hot water cold path. The input end of the second heat path is connected to the waste gas treatment unit. The high-temperature flue gas generated by the RTO combustion device 50 can be input into the second heat path, and heat exchange is used to heat the tap water sucked into the hot water cold path by the water supply component 93, so that the hot water cold path can output hot water.

[0073] In this embodiment, both the air heat exchanger 90 and the hot water heat exchanger 92 can be heat exchangers. More specifically, in the air heat exchanger 90, the input end of the air cold path is formed as an air cold inlet 901, the output end of the air cold path is formed as an air cold outlet 902, the input end of the first heat path is formed as a first gas heat inlet 903, and the output end of the first heat path is formed as a first gas heat outlet 904; in the hot water heat exchanger 92, the input end of the hot water cold path is formed as a hot water cold inlet 921, the output end of the hot water cold path is formed as a hot water cold outlet 922, the input end of the second heat path is formed as a second gas heat inlet 923, and the output end of the second heat path is formed as a second gas heat outlet 924. Both the first gas heat outlet 904 and the second gas heat outlet 924 are connected to the chimney 400 for unified discharge.

[0074] Furthermore, in this embodiment, as Figure 1 shown, the output end of the air cold path is connected to the painting workshop 200 to output hot gas to the painting workshop 200 for heating the painting workshop 200 to accelerate the paint curing speed, replacing the existing method of heating air by purchasing commercially available steam through an air handling unit, canceling or reducing the consumption of commercially available steam, and saving energy costs; the output end of the hot water cold path is connected to the water storage tank 300. The water storage tank 300 can be used in the bathroom for people to take baths, further saving energy costs.

[0075] In a preferred embodiment, as Figure 1 shown, the flexible operation system for VOCs waste gas treatment further includes a hybrid component 70. The hybrid component 70 is arranged between the waste gas treatment unit and the waste heat utilization unit, and is used to mix the high-temperature flue gas discharged from the conversion heat path outlet 24 of the desorption heat path and the high-temperature flue gas discharged from at least one RTO combustion device 50, and then transport the mixture to the first gas heat path inlet 903 and / or the second gas heat path inlet 923, so as to uniformly recover the heat energy generated by the combustion of the RTO combustion device 50 and the heat energy after heat exchange in the heat energy conversion component 20. In this embodiment, the hybrid component 70 can be selected as a hybrid box.

[0076] According to the VOCs waste gas treatment flexible operation system of the present invention, by optimizing the pipelines and control systems of multiple sets of independent waste gas treatment components, the waste gas treatment components in multiple bays of the painting workshop are integrated into a flexible operation VOCs waste gas treatment system that can automatically switch different numbers of zeolite rotors and different numbers of RTO combustion devices according to different operating conditions and VOC organic waste gas concentrations in multiple bays, so as to meet the requirements of different painting operation plan conditions, change the situation that the existing VOCs waste gas treatment device is fully open for 24 hours, greatly save the consumption of electric energy and natural gas, and reduce the operation cost of the VOCs waste gas treatment system.

[0077] Secondly, the present invention exchanges heat between the cold-path air and the high-temperature flue gas discharged from the RTO combustion device through the heat energy conversion component, and then sends it to the zeolite rotor for thermal desorption of the concentrated organic waste gas, replacing the existing electric heating desorption method, greatly reducing the electric energy consumption and saving the energy cost expenditure.

[0078] In addition, the present invention circularly recovers and reuses the heat energy generated during the combustion process, realizes flexible switching of heat exchange of multiple substances through the combined heat exchange component, realizes heating the air in the painting workshop by air heat exchange method and / or providing hot water for the bathroom by hot water heat exchange method, replacing the original method of heating the air in the painting workshop by steam, and greatly reducing the consumption and cost of purchased steam.

[0079] According to a treatment method provided in the second aspect of the present invention, it is applied to the implementation of the above-mentioned VOCs waste gas treatment flexible operation system.

[0080] In this embodiment, there are multiple painting workshops in the painting factory building for spraying ships. The work of spraying ships includes painting and curing, and the painting workshops used for painting and curing are different. Specifically, the painting work includes overall spraying, touch-up spraying, and roller coating, and the painting workshops used for overall spraying, touch-up spraying, and roller coating are also different. Curing includes the early curing state, the middle curing state, and the late curing state. In different painting operations or curing states, the concentration and air pressure of the gas transported by the waste gas transportation unit are different, and the VOCs waste gas treatment flexible operation system turns on at least one zeolite rotor and RTO combustion equipment according to the concentration and air pressure of the gas to treat the gas.

[0081] In this embodiment, each painting workshop in the painting factory building performs painting operations in sections, that is, some painting workshops perform painting, and some painting workshops perform curing. The detection component can detect the concentration and air pressure of the gas to be treated transported from each painting workshop through the waste gas transportation unit, and the concentration and air pressure data are fed back to the PLC control unit. The PLC performs calculations according to the program-set working conditions and parameters and automatically matches to turn on one or more zeolite rotors and one or more RTO combustion equipment for waste gas treatment.

[0082] Specifically, when the concentration and air pressure data detected by the detection component are low, the VOCs waste gas treatment flexible operation system starts one zeolite rotor for adsorption and desorption operations and starts one RTO combustion equipment to burn and treat the concentrated organic waste gas. When the concentration and air pressure data detected by the detection component rise and reach the preset parameters, the PLC control unit turns on the second zeolite rotor to share the adsorption and desorption operations, and the VOCs waste gas treatment flexible operation system starts the second RTO combustion equipment in a timely manner according to the concentration and air pressure of the desorbed organic waste gas to share the combustion operation. When the concentration and air pressure data detected by the detection component further increase, more required equipment will be started. Similarly, when the concentration and air pressure data detected by the concentration detection component decrease, the VOCs waste gas treatment flexible operation system will also turn off the zeolite rotor and the burning RTO combustion equipment in a timely manner, so as to achieve the most efficient and economical operation.

[0083] According to the VOCs waste gas treatment flexible operation system treatment method of the present invention, different numbers of zeolite rotors and different numbers of RTO combustion equipment can be automatically switched according to different operating conditions and the concentration of VOC organic waste gas to meet the requirements of different painting operation plan working conditions and achieve the most efficient and economical operation of the VOCs waste gas treatment device. It changes the situation that the existing VOCs waste gas treatment device is fully open for 24 hours, greatly saves the consumption of electric energy and natural gas, and reduces the operating cost of the VOCs waste gas treatment system.

[0084] Finally, it should be noted that the above-described embodiments are only specific embodiments of the present application, which are used to illustrate the technical solutions of the present application, rather than limiting it. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that any person skilled in the art within the technical scope disclosed by the present application can still modify the technical solutions described in the foregoing embodiments or can easily think of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A flexible operation system for VOCs waste gas treatment, which is used to treat the gas generated in the painting workshop, is characterized in that, The flexible operation system for VOCs waste gas treatment includes a waste gas conveying unit, a waste gas treatment unit, and a waste heat utilization unit that are connected in sequence: The waste gas treatment unit includes a heat energy conversion component, a detection component, and multiple groups of waste gas treatment components arranged in parallel; each group of waste gas treatment components is connected to multiple waste gas conveying units, and each waste gas conveying unit can convey the gas to at least one waste gas treatment component. The detection component is used to detect the concentration and wind pressure of the gas; The waste gas treatment component includes a zeolite rotor and an RTO combustion device that are connected to each other; the heat energy conversion component is respectively connected to the zeolite rotor and the RTO combustion device. Part of the high-temperature flue gas generated by the combustion of the RTO combustion device is conveyed to the heat energy conversion component to perform heat exchange on the gas conveyed from the zeolite rotor to the heat energy conversion component. The temperature of the gas after heat exchange rises and is conveyed back to the zeolite rotor through the heat energy conversion component for thermal desorption; The waste heat utilization unit is connected to the RTO combustion device. The waste heat utilization unit includes a heat exchange component, and part of the high-temperature flue gas is introduced into the heat exchange component to heat the medium in the heat exchange component; Each group of waste gas treatment components further includes: A first on-off valve, arranged upstream of the zeolite rotor along the flowing direction of the gas; A second on-off valve, arranged between the heat energy conversion component and the zeolite rotor; A third on-off valve, arranged between the zeolite rotor and the RTO combustion device; A fourth on-off valve, arranged between the RTO combustion device and the heat energy conversion component; A fifth on-off valve, arranged between the RTO combustion device and the waste heat utilization unit; Each group of waste gas treatment components further includes: A first fan, arranged upstream of the first on-off valve along the flowing direction of the gas; A second fan, arranged between the zeolite rotor and the heat energy conversion component; A third fan, arranged between the zeolite rotor and the fourth on-off valve; A first connecting pipe is arranged between the first fan and the first on-off valve. Multiple zeolite rotors are connected in parallel through the first connecting pipe, and each first fan can convey the gas to at least one zeolite rotor; a second connecting pipe is arranged between the third fan and the fourth on-off valve. Multiple RTO combustion devices are connected in parallel through the second connecting pipe, and each third fan can convey the gas to at least one RTO combustion device; The detection component includes: A first detection component, connected to the first connecting pipe; the first detection component is communicatively connected to multiple first on-off valves; A second detection component, connected to the second connecting pipe; the second detection component is communicatively connected to multiple fourth on-off valves.

2. The VOCs waste gas treatment flexible operation system according to claim 1, characterized in that The heat energy conversion component includes a desorption cold path and a desorption heat path; the desorption cold path is connected to the zeolite rotor, and the desorption heat path is respectively connected to the RTO combustion device and the waste heat utilization unit.

3. The VOCs waste gas treatment flexible operation system according to claim 2, wherein, The flexible operation system for VOCs waste gas treatment further includes: The hybrid component is arranged between the waste gas treatment unit and the waste heat utilization unit and is used to mix the high-temperature flue gas discharged from the desorption heat path and the high-temperature flue gas discharged from at least one of the RTO combustion devices.

4. The VOCs waste gas treatment flexible operation system according to claim 1, wherein The VOCs waste gas treatment flexible operation system further includes: The pretreatment unit is arranged between the waste gas conveying unit and the waste gas treatment unit.

5. The VOCs waste gas treatment flexible operation system according to claim 1, characterized in that, The heat exchange assembly includes a gas heat exchange assembly and a liquid heat exchange assembly; The gas heat exchange assembly includes an air heat exchange component and a gas supply component. The air heat exchange component has an air cold path and a first heat path capable of heat exchange, and the gas supply component is communicated with the air cold path; the first heat path is communicated with the waste gas treatment unit; The liquid heat exchange assembly includes a hot water heat exchange component and a water supply component. The hot water heat exchange component has a hot water cold path and a second heat path capable of heat exchange, and the water supply component is communicated with the hot water cold path, and the second heat path is communicated with the waste gas treatment unit.

6. The VOCs waste gas treatment flexible operation system according to claim 5, characterized in that, The air cold path is communicated with the painting workshop and is used to heat the painting workshop to accelerate the paint curing speed; The hot water cold path is communicated with the water storage tank.

7. A treatment method for a flexible operation system for VOCs waste gas treatment, characterized in that, Applied to the VOCs waste gas treatment flexible operation system according to any one of claims 1 to 6; the painting workshop is used for spraying ships, and spraying ships includes painting and curing; The painting work includes overall spraying, repair spraying and roller coating; Curing includes a pre-curing state, a mid-curing state and a post-curing state; In different painting works or curing states, the concentration and air pressure of the gas conveyed by the waste gas conveying unit are different, and the VOCs waste gas treatment flexible operation system turns on at least one of the zeolite rotors and the RTO combustion devices according to the concentration and air pressure of the gas to treat the gas.

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