Environmental protection system for collecting and treating unorganized waste gas and its treatment method

Abstract

The present invention discloses an environmental protection system for collecting and treating unorganized exhaust gas and a treatment method thereof. The system comprises a recovery chamber, an unorganized exhaust gas connection end, a waste heat exchange module, a catalytic combustion module and a heating module. An exhaust port and an air inlet are provided on the recovery chamber. The waste heat exchange module, the catalytic combustion module and the heating module are arranged in the recovery chamber. A drainage channel is provided on the cavity wall of the recovery chamber. The input end of the waste heat exchange module is connected to the unorganized exhaust gas connection end, and the output end is connected to the upper end of the drainage channel. The lower end of the drainage channel extends to a position above the air inlet. The unorganized exhaust gas is cleverly used to supplement oxygen for high-temperature exhaust gas, thereby improving the effect of supporting combustion, making combustion more complete and having a good purification effect. At the same time, the waste heat of the purified exhaust gas is used to heat the unorganized exhaust gas to a starting temperature, thereby effectively saving energy and achieving the purpose of energy saving and environmental protection, further improving the purification treatment effect, and facilitating wide promotion and application.

Description

Technical Field

[0001] The present invention relates to the technical field of fugitive emission waste gas collection and treatment, and in particular to an environmental protection system for fugitive emission waste gas collection and treatment and a treatment method thereof. Background Art

[0002] In the production process of enameled wire equipment, there are unorganized exhaust gases emitted at the inlet of the paint oven, the outlet of the paint oven, and the upper part of the paint box. Therefore, it is necessary to set up a recovery cover at the location where the unorganized exhaust gases are emitted for recovery. After the unorganized exhaust gases are recovered, the temperature of the exhaust gases is close to room temperature. Because the temperature is too low, it cannot reach the ignition temperature before catalysis and cannot be directly catalytically treated. At present, there is no system or method specifically for collecting and treating the unorganized exhaust gases for environmental protection.

[0003] In addition, organic solvents such as toluene, xylene, cresol, esters, ketones, etc. are used in the production process of enameled wire. After the high-temperature baking process of painting, a large amount of organic waste gas is generated. The discharged waste gas contains a large number of toxic molecules and is accompanied by a strong pungent smell. Although the enameling machine itself has two catalytic combustion systems, which can effectively reduce the content of organic gas, the performance of the enameled wire products must be considered first. The combustion temperature and combustion time in its production process are limited. The organic solvents in the waste gas cannot be completely burned, and in the catalytic combustion process, high-temperature waste gas of more than 450°C can be generated. This high-temperature waste gas is difficult to use because of its high temperature, and a large part of it will be discharged as waste gas, which will not only pollute the atmosphere, but also cause energy waste. Summary of the invention

[0004] In view of the above-mentioned deficiencies, the object of the present invention is to provide an environmental protection system for collecting and treating unorganized emission waste gas and a treatment method thereof, which can reasonably utilize the high temperature of high-temperature exhaust gas to effectively treat the collected unorganized emission waste gas, and has good purification treatment effect, is beneficial to environmental protection, and has low cost.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a technical solution: a method for collecting and treating unorganized exhaust gas, characterized in that it comprises the following steps:

[0006] (1) High-temperature exhaust gas enters the bottom of the recovery chamber;

[0007] (2) If the temperature of the high-temperature exhaust gas is lower than the predetermined temperature, the heating module heats the high-temperature exhaust gas to the predetermined temperature; if the temperature of the high-temperature exhaust gas is equal to or higher than the predetermined temperature, the heating module does not work;

[0008] (3) The catalytic combustion module fully catalytically burns the high-temperature exhaust gas to achieve the purpose of purifying the exhaust gas; the purified exhaust gas exchanges heat with the waste heat exchange module and then is discharged from the recovery chamber;

[0009] (4) The collected unorganized exhaust gas enters the waste heat exchange module, and after heat exchange with the waste heat exchange module, it is guided to the bottom of the recovery chamber and evenly mixed with the high-temperature exhaust gas to form a mixed exhaust gas;

[0010] (5) If the temperature of the mixed exhaust gas is lower than the predetermined temperature, the heating module heats the mixed exhaust gas to the predetermined temperature; if the temperature of the mixed exhaust gas is equal to or higher than the predetermined temperature, the heating module does not work;

[0011] (6) The catalytic combustion module fully catalytically burns the mixed exhaust gas to achieve the purpose of purifying the exhaust gas; the purified exhaust gas exchanges heat with the unorganized exhaust gas in the waste heat exchange module and then is discharged from the recovery chamber;

[0012] Repeat steps (4)-(6) to achieve the purpose of continuously collecting and treating unorganized exhaust gas.

[0013] As a preferred solution of the present invention, the high-temperature exhaust gas is the high-temperature exhaust gas discharged from a paint baking furnace.

[0014] As a preferred embodiment of the present invention, the catalytic combustion module includes a multi-stage catalytic medium bed, and the catalytic combustion beds of each stage are stacked in intervals from bottom to top, and the catalytic combustion bed at the upper stage is burned by the combustion flame of the catalytic combustion bed at the lower stage.

[0015] As a preferred solution of the present invention, the predetermined temperature is ≥260°C.

[0016] As a preferred solution of the present invention, the flow rate of the purified waste gas when it is discharged is 5 to 10 times the flow rate of the unorganized exhaust gas when it enters the waste heat exchange module.

[0017] An environmental protection system for collecting and treating unorganized waste gas, comprising a recovery chamber, an unorganized waste gas connection end, a waste heat exchange module, a catalytic combustion module and a heating module, wherein the recovery chamber is provided with an exhaust port at the top and an air inlet at the bottom, and the waste heat exchange module, the catalytic combustion module and the heating module are sequentially arranged in the recovery chamber from top to bottom, and a drainage channel is provided on the cavity wall of the recovery chamber, the input end of the waste heat exchange module is connected to the unorganized waste gas connection end, the output end of the waste heat exchange module is connected to the upper end of the drainage channel, and the lower end of the drainage channel extends to the upper position of the air inlet. The unorganized waste gas connection end is connected to the waste gas collection pipeline, which is provided with a suction fan, and the end of the waste gas collection pipeline is provided with an unorganized waste gas recovery cover.

[0018] As a preferred solution of the present invention, the waste heat exchange module includes a plurality of flat coils arranged at intervals, a heat exchange channel is formed between two adjacent flat coils, the input ends of all the flat coils are connected to the unorganized exhaust gas connection end, and the output ends of all the flat coils are connected to the drainage channel.

[0019] As a preferred embodiment of the present invention, the catalytic combustion module includes a plurality of catalytic combustion beds stacked in an interval from bottom to top, the vertical distance between two adjacent catalytic combustion beds is 15 to 30 mm, and the catalytic combustion beds are covered with purification catalysts. The principle of the outer flame burning the second stage catalytic combustion bed after the first stage catalytic combustion bed is burned, and the outer flame burning the third stage catalytic combustion bed after the second stage catalytic combustion bed is burned is adopted. By analogy, the catalytic temperature can be gradually increased, and the highest temperature can even exceed 550°C. The higher the combustion temperature, the more thorough the degree of treatment and purification.

[0020] As a preferred embodiment of the present invention, the purification catalyst is preferably a VOCs purification catalyst or a purification catalyst of model HYMCC-B100.

[0021] As a preferred solution of the present invention, an air dividing baffle is provided above the air inlet in the recovery chamber, which is conducive to the uniform distribution of high-temperature exhaust gas into the recovery chamber.

[0022] As a preferred solution of the present invention, a plurality of air-distributing pipes connected to the drainage channels are arranged side by side above the corresponding air-distributing baffle in the recovery chamber, and the pipe walls of the air-distributing pipes are covered with air holes, so that the unorganized exhaust gas can be dispersed into the recovery chamber and the uniformity of mixing with the high-temperature exhaust gas can be improved.

[0023] As a preferred solution of the present invention, the heating module is a plurality of heating tubes distributed above the gas equalizing tube, and has a good heating effect.

[0024] As a preferred solution of the present invention, a pre-catalytic temperature measuring thermocouple is provided on the recovery chamber at a position corresponding to the heating module and the catalytic combustion module, for detecting whether the exhaust gas before catalysis has reached a predetermined temperature.

[0025] As a preferred solution of the present invention, a post-catalytic temperature measurement thermocouple is provided on the recovery chamber corresponding to the upper position of the catalytic combustion module.

[0026] As a preferred solution of the present invention, a heat-insulating layer is provided on the cavity wall of the recovery cavity to improve the heat-insulating effect and avoid heat waste.

[0027] As a preferred solution of the present invention, a hook is provided on the recovery chamber, which brings convenience to installation and daily maintenance.

[0028] The beneficial effects of the present invention are as follows: the structural design of the environmental protection system for collecting and treating unorganized exhaust gas provided by the present invention is ingenious, and the waste heat of the purified exhaust gas is reasonably utilized to perform heat exchange with the unorganized exhaust gas collected and sent to the waste heat exchange module, so that the temperature of the unorganized exhaust gas can be increased from room temperature to above about 300 degrees. At this time, the temperature has exceeded the catalytic minimum ignition temperature of 260°C, and then it is evenly sent into the recovery chamber through the drainage channel and evenly mixed with the high-temperature exhaust gas to form a mixed exhaust gas, and then it goes up into the catalytic combustion module for combustion, thus completing the purification process; the method for collecting and treating unorganized exhaust gas provided by the present invention is easy to use, and ingeniously utilizes the unorganized exhaust gas to supplement oxygen for the high-temperature exhaust gas, thereby enhancing the combustion-supporting effect, making the combustion more complete and the purification effect better, and also utilizes the waste heat of the purified exhaust gas to heat the unorganized exhaust gas to the ignition temperature, effectively saving energy, achieving the purpose of energy saving and environmental protection, and facilitating wide promotion and application.

[0029] The present invention is further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural principle diagram of the present invention.

[0031] Figure 2 It is a cross-sectional structural schematic diagram of the present invention.

[0032] Figure 3 It is a schematic diagram of the system operation principle of the present invention. DETAILED DESCRIPTION

[0033] Example: See Figures 1 to 3 An embodiment of the present invention provides an environmental protection system for collecting and treating unorganized exhaust gas, which includes an unorganized exhaust gas connection end 1, a recovery chamber 2, a waste heat exchange module 3, a catalytic combustion module 4 and a heating module 5.

[0034] The unorganized exhaust gas connection end 1 is connected to the exhaust gas collection pipeline 6, on which a suction fan 11 is provided, and at the end of the exhaust gas collection pipeline 6, an unorganized exhaust gas recovery cover 7 is provided. The unorganized exhaust gas recovery cover 7 is installed at a location where unorganized exhaust gas exists, such as the inlet of a paint baking furnace, the outlet of a paint baking furnace, the upper part of a paint adding box, and the like.

[0035] An exhaust port 21 is provided at the top of the recovery chamber 2, and an air inlet 22 is provided at the bottom. The air inlet 22 is used to connect with the exhaust port 21 of the paint baking oven. The exhaust port 21 is used to discharge the purified waste gas. An exhaust fan 12 is provided on the exhaust pipeline connected to the exhaust port 21.

[0036] An air dividing baffle 8 is provided above the air inlet 22 in the recovery chamber 2. Specifically, a plurality of air dividing baffles 8 are symmetrically inclined with the center line of the recovery chamber 2 as the center line, which is conducive to evenly distributing the high-temperature exhaust gas into the recovery chamber 2.

[0037] The waste heat exchange module 3, the catalytic combustion module 4 and the heating module 5 are sequentially arranged in the recovery chamber 2 from top to bottom. A pre-catalytic temperature measuring thermocouple 9 is arranged on the recovery chamber 2 between the corresponding heating module 5 and the catalytic combustion module 4, which is used to detect whether the exhaust gas before catalysis has reached a predetermined temperature. A post-catalytic temperature measuring thermocouple 10 is arranged on the recovery chamber 2 above the corresponding catalytic combustion module 4, which is used to detect the temperature after catalytic combustion, so as to understand the combustion efficiency in real time.

[0038] A drainage channel 23 is provided on the cavity wall of the recovery cavity 2, the input end of the waste heat exchange module 3 is connected to the unorganized exhaust gas connection end 1, and the output end of the waste heat exchange module 3 is connected to the upper end of the drainage channel 23. Specifically, the waste heat exchange module 3 includes a plurality of flat coils, and a plurality of flat coils are arranged horizontally at intervals to form an arrangement combination, and a plurality of arrangements are arranged in an order from bottom to top, and a heat exchange channel is formed between two adjacent flat coils, and the input ends of all flat coils are connected to the unorganized exhaust gas connection end 1, and the output ends of all flat coils are connected to the drainage channel 23.

[0039] The lower end of the drainage channel 23 extends to the upper position of the air inlet 22. Preferably, a plurality of air equalizing pipes 24 respectively connected to the drainage channel 23 are arranged side by side above the corresponding air dividing baffle 8 in the recovery chamber 2, and the tube wall of the air equalizing pipe 24 is covered with pores. The unorganized exhaust gas can be dispersed into the recovery chamber 2 to improve the uniformity of mixing with the high-temperature exhaust gas. In this embodiment, the heating module 5 is a plurality of heating pipes, which are distributed above the air equalizing pipe 24 and have a good heating effect. The heating pipes are arranged in an array at intervals, which is beneficial to the circulation of exhaust gas and has a good heating effect.

[0040] The catalytic combustion module 4 includes a plurality of catalytic combustion beds stacked at intervals in a sequence from bottom to top. In the present embodiment, the number of the catalytic combustion beds is four. That is, a four-stage catalytic combustion bed is formed. The vertical distance between two adjacent catalytic combustion beds is 15 to 30 mm, preferably 20 mm, and the catalytic combustion bed is covered with purification catalysts. Specifically, the catalytic combustion bed includes a frame and a purification catalyst placed on the frame, and the purification catalyst is evenly covered with vents. The purification catalyst is preferably a VOCs purification catalyst or a purification catalyst of model HYMCC-B100. By using the combustion flame of the catalytic combustion bed located at the lower level to flame the catalytic combustion bed located at its upper level, the catalytic temperature can be gradually increased, and the highest temperature can even exceed 550°C to achieve the purpose of purifying the exhaust gas.

[0041] In addition, a heat preservation layer is provided on the cavity wall of the recovery cavity 2 to improve the heat preservation effect and avoid heat waste. A hook is provided on the recovery cavity 2 to facilitate installation and daily maintenance.

[0042] When working, the working steps of the environmental protection system for collecting and treating unorganized exhaust gas of the present invention are as follows:

[0043] (1) The environmental protection system for collecting and treating unorganized exhaust gas of the present invention is pre-installed on the exhaust port of the paint baking furnace 13. The high-temperature exhaust gas discharged from the exhaust port of the paint baking furnace 13 enters the bottom of the recovery chamber 2; the high-temperature exhaust gas is the high-temperature exhaust gas discharged by the paint baking furnace, and the temperature of the high-temperature exhaust gas is relatively high, generally above 400°C. In this embodiment, the actual operating temperature is 468°C;

[0044] (2) Through the pre-catalytic temperature measuring thermocouple 9, if the temperature of the high-temperature exhaust gas is lower than the predetermined temperature, the heating module 5 heats the high-temperature exhaust gas to the predetermined temperature; if the temperature of the high-temperature exhaust gas is equal to or higher than the predetermined temperature, the heating module 5 does not work; since 260°C is the minimum ignition temperature of the catalysis, the predetermined temperature can be set to ≥260°C, and the actual operation process can be adjusted according to actual needs. For example, if it is higher than 450°C, the catalytic combustion effect is better; in this embodiment, the actual operation is measured to be 460°C;

[0045] (3) The catalytic combustion module 4 fully catalytically burns the high-temperature exhaust gas to achieve the purpose of purifying the exhaust gas; the purified exhaust gas exchanges heat with the waste heat exchange module 3 and then is discharged from the recovery chamber 2; the temperature of the purified exhaust gas at this time can reach above 400°C; in this embodiment, the actual operation is measured to be 523°C; the speed of the exhaust fan 12 is set to 1200 rpm to 2800 rpm;

[0046] (4) The collected unorganized exhaust gas enters the waste heat exchange module 3, and after heat exchange with the waste heat exchange module 3, it is drained to the bottom of the recovery chamber 2 and evenly mixed with the high-temperature exhaust gas to form a mixed exhaust gas; the unorganized exhaust gas is used to supplement oxygen for the high-temperature exhaust gas to enhance the combustion-supporting effect, so that the combustion is more complete and the purification effect is better; the flow rate of the purified exhaust gas when it is discharged is 5 to 10 times the flow rate of the unorganized exhaust gas when it enters the waste heat exchange module 3. The purified exhaust gas with a large flow rate and a temperature of more than 400°C can heat exchange with the unorganized exhaust gas, and the temperature of the unorganized exhaust gas can be raised from room temperature to more than 300 degrees;

[0047] (5) If the temperature of the mixed exhaust gas is lower than the predetermined temperature, which is preferably 450° C. in this embodiment, the heating module 5 heats the mixed exhaust gas to the predetermined temperature; if the temperature of the mixed exhaust gas is equal to or higher than the predetermined temperature, the heating module 5 does not work;

[0048] (6) The catalytic combustion module 4 performs full catalytic combustion on the mixed exhaust gas. Specifically, the outer flame after the combustion of the first-stage catalytic combustion bed is used to burn the second-stage catalytic combustion bed, the outer flame after the combustion of the second-stage catalytic combustion bed is used to burn the third-stage catalytic combustion bed, and the outer flame after the combustion of the third-stage catalytic combustion bed is used to burn the fourth-stage catalytic combustion bed, so that the catalytic temperature rises step by step, and the highest temperature can even exceed 550°C, which is conducive to full catalytic combustion of the mixed exhaust gas and has a good purification effect; the purified exhaust gas exchanges heat with the unorganized exhaust gas in the waste heat exchange module 3 and is discharged from the recovery chamber 2; the waste heat of the purified exhaust gas is used to heat the unorganized exhaust gas to the ignition temperature, which effectively saves energy and achieves the purpose of energy saving and environmental protection;

[0049] Repeat steps (4) to (6) to achieve the purpose of continuously collecting and treating the unorganized exhaust gas. The present invention cleverly uses the unorganized exhaust gas to supplement oxygen for the high-temperature exhaust gas, effectively improving the combustion-supporting effect, making the combustion more complete and the purification effect better. At the same time, the waste heat of the purified exhaust gas is used to heat the unorganized exhaust gas to the ignition temperature, effectively saving energy and being energy-saving and environmentally friendly.

[0050] According to the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs may also change and modify the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present invention. As described in the above embodiments of the present invention, the use of the same or similar processing systems and methods is within the protection scope of the present invention.

Claims

1. A method for collecting and treating unorganized exhaust gas, characterized in that: It includes the following steps: (1) High-temperature exhaust gas enters the bottom of the recovery chamber; (2) If the temperature of the high-temperature exhaust gas is lower than the predetermined temperature, the heating module heats the high-temperature exhaust gas to the predetermined temperature; if the temperature of the high-temperature exhaust gas is equal to or higher than the predetermined temperature, the heating module does not work; (3) The catalytic combustion module fully catalytically burns the high-temperature exhaust gas to achieve the purpose of purifying the exhaust gas; the purified exhaust gas exchanges heat with the waste heat exchange module and then is discharged from the recovery chamber; (4) The collected unorganized exhaust gas enters the waste heat exchange module, and after heat exchange with the waste heat exchange module, it is guided to the bottom of the recovery chamber and evenly mixed with the high-temperature exhaust gas to form a mixed exhaust gas; (5) If the temperature of the mixed exhaust gas is lower than the predetermined temperature, the heating module heats the mixed exhaust gas to the predetermined temperature; if the temperature of the mixed exhaust gas is equal to or higher than the predetermined temperature, the heating module does not work; (6) The catalytic combustion module fully catalytically burns the mixed exhaust gas to achieve the purpose of purifying the exhaust gas; the purified exhaust gas exchanges heat with the unorganized exhaust gas in the waste heat exchange module and then is discharged from the recovery chamber; Repeat steps (4)-(6) to achieve the purpose of continuously collecting and treating unorganized exhaust gas.

2. The method for collecting and treating unorganized exhaust gas according to claim 1, characterized in that: The high-temperature exhaust gas is the high-temperature exhaust gas emitted by the paint baking furnace.

3. The method for collecting and treating unorganized exhaust gas according to claim 1, characterized in that: The catalytic combustion module comprises a multi-stage catalytic medium bed, wherein the catalytic combustion beds of each stage are stacked in intervals from bottom to top, and the catalytic combustion bed at the upper stage is burned by the combustion flame of the catalytic combustion bed at the lower stage.

4. The method for collecting and treating unorganized exhaust gas according to claim 1, characterized in that: The predetermined temperature is ≥ 260°C.

5. The method for collecting and treating unorganized exhaust gas according to any one of claims 1 to 4, characterized in that: The flow rate of the purified waste gas when it is discharged is 5 to 10 times the flow rate of the unorganized exhaust gas when it enters the waste heat exchange module.

6. An environmental protection system for collecting and treating unorganized waste gas, characterized in that: It includes a recovery chamber, an unorganized exhaust gas connection end, a waste heat exchange module, a catalytic combustion module and a heating module. The top of the recovery chamber is provided with an exhaust port, and the bottom is provided with an air inlet. The waste heat exchange module, the catalytic combustion module and the heating module are arranged in the recovery chamber in sequence from top to bottom. A drainage channel is provided on the cavity wall of the recovery chamber. The input end of the waste heat exchange module is connected to the unorganized exhaust gas connection end, and the output end of the waste heat exchange module is connected to the upper end of the drainage channel. The lower end of the drainage channel extends to the upper position of the air inlet.

7. The environmental protection system for collecting and treating unorganized exhaust gas according to claim 6 is characterized in that: The waste heat exchange module includes a plurality of flat coils arranged at intervals, a heat exchange channel is formed between two adjacent flat coils, the input ends of all flat coils are connected to the unorganized exhaust gas connection end, and the output ends of all flat coils are connected to the drainage channel.

8. The environmental protection system for collecting and treating unorganized exhaust gas according to claim 6 is characterized in that: The catalytic combustion module comprises a plurality of catalytic combustion beds stacked in an interval from bottom to top, the vertical distance between two adjacent catalytic combustion beds is 15 to 30 mm, and the catalytic combustion beds are covered with purification catalysts.

9. The environmental protection system for collecting and treating unorganized exhaust gas according to claim 6 is characterized in that: An air dividing baffle is provided at a position above the air inlet corresponding to the recovery chamber.

10. The environmental protection system for collecting and treating unorganized exhaust gas according to claim 9 is characterized in that: A plurality of air equalizing pipes respectively connected to the drainage channels are arranged side by side at positions above the corresponding air dividing baffles in the recovery chamber, and the pipe walls of the air equalizing pipes are covered with air holes.

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