A paint spray booth exhaust treatment apparatus

Abstract

The utility model discloses a kind of paint spray booth waste gas treatment equipment, the bottom of paint spray booth is equipped with side suction port, side suction port is sequentially connected with filter box, adsorption tank and first exhaust fan by pipeline, first exhaust fan output guides the waste gas generated in paint spray booth to filter and adsorb, combustion furnace is equipped with first heat exchanger and second heat exchanger, filter box and adsorption tank are connected with the air inlet of first heat exchanger by pipeline, combustion furnace is connected with combustion-supporting fan by pipeline, the exhaust port of combustion furnace is connected with second exhaust fan by pipeline, the air inlet of second heat exchanger is connected with first air supply fan by pipeline, the air outlet of second heat exchanger is connected with paint spray booth and adsorption tank respectively by pipeline, two groups of independent heat exchangers for waste heat recovery in the utility model in combustion furnace are equipped, first heat exchanger is used for conventional preheating waste gas, reduces energy consumption, second heat exchanger is used for adsorption tank desorption and paint spray booth temperature control, with multiple use modes, it is flexible and convenient to use.

Description

Technical Field

[0001] This utility model relates to the field of waste gas treatment equipment, and in particular to a waste gas treatment device for a paint booth. Background Technology

[0002] Spray painting exhaust refers to the paint spray particles and other forms of organic waste gas generated during the spray painting process. To prevent these exhaust gases from entering the atmosphere and causing pollution, the spray painting process is generally carried out in a spray booth, where the air is treated before being released.

[0003] The main treatment methods for paint spraying exhaust gas include adsorption, direct combustion, catalytic combustion, absorption, condensation, and water spraying, each with its own advantages and disadvantages. The current mainstream treatment method is a comprehensive approach combining activated carbon adsorption and catalytic combustion, achieving a treatment efficiency of over 98% and wide applicability. However, the current installation and combination methods for these two methods are fixed, resulting in a relatively simple mode. For example, although some catalytic combustion furnaces have waste heat recovery systems, the recovered waste heat is used for preheating the exhaust gas to reduce energy consumption in the combustion furnace heating chamber, resulting in limited recovery and utilization rates. Furthermore, when activated carbon adsorption becomes saturated, exhaust gas treatment needs to be suspended for desorption or replacement of the activated carbon; these are all existing problems. Utility Model Content

[0004] To overcome the above deficiencies, this utility model provides a paint booth exhaust gas treatment device, which is designed and optimized to make the exhaust gas treatment device more flexible and convenient to use and reduce the cost of use.

[0005] This utility model is achieved through the following technical solution: A paint booth exhaust gas treatment device includes a combustion furnace and a paint booth, characterized in that: a side suction port is provided at the bottom of the paint booth, and the side suction port is connected in sequence to a filter box, an adsorption box and a first exhaust fan through pipes; the first exhaust fan outputs and guides the exhaust gas generated in the paint booth for filtration and adsorption; the combustion furnace is provided with a first heat exchanger and a second heat exchanger; the filter box and the adsorption box are both connected to the air inlet of the first heat exchanger through pipes; the combustion furnace is connected to a combustion fan through pipes; the exhaust port of the combustion furnace is connected to a second exhaust fan through pipes; the air inlet of the second heat exchanger is connected to a first blower through pipes; and the air outlet of the second heat exchanger is connected to the paint booth and the adsorption box through pipes respectively.

[0006] Further optimized, the top of the spray booth is provided with an air outlet, the air outlet is connected to an air supply filter box, and the air supply filter box is connected to a second blower through a pipe.

[0007] In a further optimized manner, the air outlet of the second heat exchanger is connected to the air supply filter box of the paint booth via a pipe, a first flow regulating valve is provided on the pipe near the air supply filter box, and a second flow regulating valve is provided on the pipe between the air outlet of the second heat exchanger and the adsorption box.

[0008] Further optimized, large-diameter solenoid valves are provided between the filter box and the adsorption box, between the adsorption box and the combustion furnace, and between the filter box and the combustion furnace.

[0009] Further optimized, the first heat exchanger is located on the side closer to the catalytic bed in the combustion furnace, and the second heat exchanger is located on the side farther away from the catalytic bed in the combustion furnace.

[0010] Further optimized, the first heat exchanger is used to preheat the exhaust gas, the air inlet of the first heat exchanger is the exhaust gas inlet, and the air outlet of the first heat exchanger leads the preheated exhaust gas to the heating chamber of the combustion furnace. The second heat exchanger is used for desorption in the adsorption box and temperature control in the paint booth, the air inlet of the second heat exchanger is the air inlet, and the air outlet of the second heat exchanger leads the preheated air to the air supply filter box of the adsorption box or the paint booth.

[0011] Further optimized, it also includes a controller, which is electrically connected to the first flow regulating valve, the second flow regulating valve, the large-diameter solenoid valve, the first blower, the second blower, the first exhaust fan, and the second exhaust fan via wires.

[0012] The beneficial effects of this utility model are: This novel design incorporates two independent heat exchangers within the combustion furnace for waste heat recovery. The first heat exchanger preheats the exhaust gas before it enters the heating chamber, reducing energy consumption. The second heat exchanger controls desorption in the adsorption box and temperature in the spray booth. Heated air flows from the second heat exchanger to the adsorption box for activated carbon desorption; it also increases the temperature in the spray booth, maintaining an optimal spraying temperature of 20-25 degrees Celsius, especially in winter. Furthermore, raising the temperature to 50-80 degrees Celsius allows for baking, improving work efficiency. This eliminates the need for an additional electric heating system in the spray booth, resulting in energy savings and enhanced safety.

[0013] This new type of equipment has multiple operating modes. Normally, after the exhaust gas is filtered by the filter box, it is directly adsorbed by the adsorption box and then discharged. When the activated carbon in the adsorption box is saturated, the exhaust gas is directly introduced into the combustion furnace for treatment and discharge. At the same time, the first blower works, sending air heated by the second heat exchanger into the adsorption box for activated carbon desorption. The desorbed exhaust gas also enters the combustion furnace for treatment and discharge. When it is necessary to increase the temperature of the spray booth or bake paint, the combustion furnace first uses fuel to work, and then the first blower works to send heated air into the spray booth after it is filtered by the air supply filter box of the spray booth to regulate the temperature for heat preservation or baking paint. The exhaust gas generated in the spray booth afterward is directly sent to the combustion furnace for treatment and discharge. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall connection structure of this utility model.

[0015] Figure 2 This is a schematic diagram of the structural distribution of the combustion furnace in this utility model.

[0016] Figure 3 This is a schematic diagram of the workflow of this utility model. Figure 1 .

[0017] Figure 4 This is a schematic diagram of the workflow of this utility model. Figure 2 .

[0018] Figure 5 This is a schematic diagram of the workflow of this utility model. Figure 3 .

[0019] Figure 6 This is a schematic diagram of the workflow of this utility model. Figure 4 .

[0020] In the diagram: 1. Spray booth; 2. Filter box; 3. Adsorption box; 4. First exhaust fan; 5. Combustion furnace; 6. Second exhaust fan; 7. First blower; 9. First flow regulating valve; 11. Blower filter box; 12. Second blower; 51. First heat exchanger; 511. Air inlet of the first heat exchanger; 52. Second heat exchanger; 521. Air inlet of the second heat exchanger; 522. Air outlet of the second heat exchanger; 53. Combustion fan; 54. Catalytic bed; 55. Exhaust port. Detailed Implementation

[0021] To clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings. In the description of this invention, it should be noted that the terms "left," "right," "front," "rear," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description. They 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 the present invention.

[0022] like Figure 1 , Figure 2 As shown, this utility model provides a paint booth exhaust gas treatment device, including a combustion furnace 5 and a paint booth 1. The bottom of the paint booth 1 is provided with a side suction port. The side suction port is connected in sequence to a filter box 2, an adsorption box 3, and a first exhaust fan 4 through a pipe. Under normal circumstances, the exhaust gas generated in the paint booth 1 is discharged from the side suction port through the first exhaust fan 4. The exhaust gas passes through the filter box 2 to filter particulate matter such as paint mist and paint residue in the exhaust gas, and then flows through the adsorption box 3. The activated carbon adsorbs organic waste gas such as benzene series compounds. The clean gas is discharged through the first exhaust fan 4.

[0023] The combustion furnace 5 is equipped with a first heat exchanger 51 and a second heat exchanger 52. The filter box 2 and the adsorption box 3 are both connected to the air inlet of the first heat exchanger 51 in the combustion furnace 5 through pipes, and the exhaust gas enters the combustion furnace 5 through this air inlet. The combustion furnace 5 is connected to a combustion fan 53 and a fuel pump through pipes to provide fuel and air to assist combustion and heat the exhaust gas. The heated exhaust gas is oxidized and decomposed by the catalytic bed 54, and converted into carbon dioxide and water vapor. The exhaust port 55 of the combustion furnace 5 is connected to a second exhaust fan 6 through pipes, and the carbon dioxide and water vapor are discharged from the exhaust port 55 of the combustion furnace 5 under the action of the second exhaust fan.

[0024] The second heat exchanger also recovers and utilizes waste heat. The air inlet of the second heat exchanger 52 is connected to the first blower 7 through a pipe. The first blower sends air into the second heat exchanger 52 for heating. The air outlet of the second heat exchanger 52 is connected to the paint booth 1 and the adsorption box 3 through a pipe and a three-way solenoid valve, respectively. The heated air can be supplied to the paint booth 1 and the adsorption box 3 as needed for paint booth temperature control and adsorption box desorption.

[0025] In a preferred embodiment, the top of the spray booth 1 is provided with an air outlet, which is connected to an air supply filter box 11. The air supply filter box 11 is connected to a second blower 12 through a pipe. The air supply filter box is used to filter the air, ensuring that the second blower supplies clean air to the spray booth, maintaining air circulation, and expelling harmful gases and paint mist.

[0026] In a preferred embodiment, the air outlet of the second heat exchanger 52 is connected to the air supply filter box 11 of the spray booth 1 via a pipe. A first flow regulating valve 9 is installed on the pipe near the air supply filter box 11, which can supply heated air to the spray booth. By adjusting the airflow of low-temperature air and heated air, the temperature can be indirectly regulated, maintaining an optimal painting temperature of 20-25 degrees Celsius inside the spray booth, or raising the temperature to 50-80 degrees Celsius for baking paint. This improves work efficiency and eliminates the need for an additional electric heating system inside the spray booth, saving energy and enhancing safety. It should be noted that the heated air also needs to be filtered.

[0027] A second flow regulating valve is installed on the pipe between the air outlet of the second heat exchanger 52 and the adsorption box 3. Air is heated in the second heat exchanger and flows into the adsorption box, raising the temperature inside the adsorption box to approximately 100 degrees Celsius, thus desorbing the activated carbon. It is important to note that the adsorption box should be equipped with a temperature monitoring sensor. The flow rate of the heated air is adjusted via the first blower and the second flow regulating valve, thereby indirectly regulating the temperature inside the adsorption box and preventing excessively high temperatures from damaging the activated carbon.

[0028] In a preferred embodiment, large-diameter solenoid valves are provided between the filter box and the adsorption box 3, between the adsorption box 3 and the combustion furnace 5, and between the filter box and the combustion furnace 5, to facilitate control of the flow direction of exhaust gas and air.

[0029] In a preferred embodiment, the first heat exchanger 51 is located on the side closer to the catalytic bed 54 inside the combustion furnace 5, and the second heat exchanger 52 is located on the side farther away from the catalytic bed 54 inside the combustion furnace 5. The waste heat required is higher, while the temperature required for desorption and temperature regulation is lower. Therefore, the first heat exchanger 51 is located on the side closer to the catalytic bed 54 inside the combustion furnace 5 to make preferential use of waste heat.

[0030] In a preferred embodiment, the first heat exchanger 51 is used to preheat the waste gas. The air inlet 511 of the first heat exchanger is the waste gas inlet, which is connected to the filter box 2 and the adsorption box 3. The air outlet of the first heat exchanger 51 leads the preheated waste gas to the heating chamber of the combustion furnace 5. After further heating, the waste gas flows to the catalytic bed 54 for oxidation and decomposition. Then, the waste heat is recovered through the two heat exchangers before being discharged.

[0031] The second heat exchanger 52 is used for desorption in the adsorption box 3 and temperature control in the spray booth 1. The air inlet 521 of the second heat exchanger is an air inlet. The first blower 7 sends air into the second heat exchanger through this inlet. The air outlet 522 of the second heat exchanger sends the preheated air to the air filter box 11 of the adsorption box 3 or the spray booth 1.

[0032] In a preferred embodiment, a controller is also included. The controller is electrically connected to the first flow regulating valve 9, the second flow regulating valve, the large-diameter solenoid valve, the three-way solenoid valve, the first blower 7, the second blower 12, the first exhaust fan 4, and the second exhaust fan 6 via wires. The blowers can be variable frequency blowers. The position of the controller is set by the operator according to the actual situation during operation. The controller is used to control the electrical components used in this solution, and a power supply is also included in conjunction with it.

[0033] More specifically, this equipment has the following operating modes: 1. Standard work mode, such as Figure 3 As shown, this mode is suitable for scenarios where the temperature inside the spray booth is suitable and the activated carbon in the adsorption box is not saturated. In this mode, the first exhaust fan 4 and the second blower 12 operate. The exhaust gas inside the spray booth is filtered by the filter box 2 to remove paint mist particles, and then the organic waste gas is adsorbed by the adsorption box. The clean air is discharged through the first exhaust fan.

[0034] 2. Catalytic combustion and desorption treatment modes, such as Figure 4 As shown, the temperature inside the spray booth is suitable, and spraying is underway, but the activated carbon in the adsorption box is saturated. This mode is suitable for scenarios where the temperature is suitable, the spray booth is operating, and the adsorption box is saturated with activated carbon. In this mode, the second exhaust fan 6, the second supply fan 12, the combustion fan 53, and the first supply fan 7 are working. The exhaust gas in the spray booth is filtered through the filter box 2 to remove paint mist particles and then directly enters the combustion furnace for treatment. At the same time, the air that has absorbed heat through the second heat exchanger is sent into the adsorption box, where the activated carbon is desorbed. The resulting exhaust gas also enters the combustion furnace through a pipeline for treatment. The carbon dioxide and water vapor produced during treatment are discharged through the second exhaust fan 6.

[0035] 3. Single desorption mode, such as Figure 5 As shown, this mode is suitable for scenarios where the activated carbon in the adsorption box is saturated and no painting operations are being performed in the paint booth. In this mode, the second exhaust fan 6, the combustion fan 53, and the first blower 7 operate, starting the combustion furnace. Initially, only fuel is burned. Air is heated by the second heat exchanger and then sent into the adsorption box 3. The activated carbon in the adsorption box is desorbed, and the resulting exhaust gas enters the combustion furnace through a pipeline for treatment. The carbon dioxide and water vapor produced during treatment are discharged through the second exhaust fan 6.

[0036] 4. Spray booth heating and baking modes, such as Figure 6As shown, this mode is suitable for situations where the temperature inside the spray booth is unsuitable for spray painting or baking during seasons with lower temperatures. In this mode, the second exhaust fan 6, the second supply fan 12, the combustion fan 53, and the first supply fan 7 operate. Simultaneously, the combustion furnace is turned on first. Air is heated by the second heat exchanger and then sent into the air supply filter box of the spray booth. It mixes and is filtered with the low-temperature air supplied by the second supply fan 12 before being evenly distributed into the spray booth. The spray booth waits for the temperature to rise to the corresponding level before spray painting or baking operations are performed. The exhaust gas generated from spray painting or baking is filtered by the filter box and then enters the combustion furnace for treatment. The carbon dioxide and water vapor produced during treatment are discharged through the second exhaust fan 6.

[0037] All aspects not detailed in this utility model are well-known to those skilled in the art. Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and not to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A spray booth exhaust gas treatment device, comprising a combustion furnace and a spray booth, characterized in that: The bottom of the spray booth is equipped with a side suction port, which is connected in sequence to a filter box, an adsorption box and a first exhaust fan through a pipe. The first exhaust fan outputs and guides the exhaust gas generated in the spray booth for filtration and adsorption. The combustion furnace is equipped with a first heat exchanger and a second heat exchanger. The filter box and the adsorption box are both connected to the air inlet of the first heat exchanger through pipes. The combustion furnace is connected to a combustion fan through pipes. The exhaust port of the combustion furnace is connected to a second exhaust fan through pipes. The air inlet of the second heat exchanger is connected to a first blower through pipes. The air outlet of the second heat exchanger is connected to the paint booth and the adsorption box through pipes respectively.

2. The paint booth exhaust gas treatment equipment according to claim 1, characterized in that: The top of the spray booth is equipped with an air outlet, which is connected to an air supply filter box. The air supply filter box is connected to a second blower through a pipe.

3. The paint booth exhaust gas treatment equipment according to claim 2, characterized in that: The air outlet of the second heat exchanger is connected to the air supply filter box of the paint booth through a pipe. A first flow regulating valve is provided on the pipe near the air supply filter box, and a second flow regulating valve is provided on the pipe between the air outlet of the second heat exchanger and the adsorption box.

4. The paint booth exhaust gas treatment equipment according to claim 3, characterized in that: Large-diameter solenoid valves are installed between the filter box and the adsorption box, between the adsorption box and the combustion furnace, and between the filter box and the combustion furnace.

5. The paint booth exhaust gas treatment equipment according to claim 1, characterized in that: The first heat exchanger is located on the side closer to the catalytic bed inside the combustion furnace, and the second heat exchanger is located on the side farther away from the catalytic bed inside the combustion furnace.

6. The paint booth exhaust gas treatment equipment according to claim 5, characterized in that: The first heat exchanger is used to preheat the exhaust gas. The air inlet of the first heat exchanger is the exhaust gas inlet, and the air outlet of the first heat exchanger leads the preheated exhaust gas to the heating chamber of the combustion furnace. The second heat exchanger is used for desorption in the adsorption box and temperature control in the paint booth. The air inlet of the second heat exchanger is the air inlet, and the air outlet of the second heat exchanger leads the preheated air to the air supply filter box of the adsorption box or the paint booth.

7. The paint booth exhaust gas treatment equipment according to claim 4, characterized in that: It also includes a controller, which is electrically connected to the first flow regulating valve, the second flow regulating valve, the large-diameter solenoid valve, the first blower, the second blower, the first exhaust fan, and the second exhaust fan via wires.

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