Organic waste gas recycling treatment system suitable for coating workshop

Abstract

The utility model discloses an organic waste gas recycling treatment system suitable for a coating workshop, which belongs to the technical field of organic waste gas treatment and comprises a gas inlet pipe, a concentration detector, a diverter valve, a high-concentration waste gas pipe, a regenerative chamber incinerator, a low-concentration waste gas pipe, a zeolite rotating wheel, a drying heat exchanger and a drying gas inlet pipe, one end of the gas inlet pipe is connected with the coating workshop, and the other end is connected with the high-concentration waste gas pipe and the low-concentration waste gas pipe through the diverter valve; the concentration detector is arranged on the air inlet pipe; the high-concentration waste gas pipe is connected with an inlet of the regenerative chamber incinerator; the low-concentration waste gas pipe is connected with an inlet of the zeolite runner adsorption area; an outlet of the adsorption area of the zeolite rotating wheel is connected with a hot fluid channel inlet of the drying heat exchanger, and the drying gas inlet pipe, a cold fluid channel of the drying heat exchanger and the coating workshop are sequentially connected. The device has the advantages of low treatment difficulty, high treatment efficiency, high waste gas utilization rate and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of organic waste gas treatment, and relates to a treatment system, in particular to an organic waste gas recycling resource treatment system suitable for a coating workshop. Background Art

[0002] The painting workshop is a common process link in industrial production, but it is also the main source of organic waste gas pollution. These workshops will emit a large amount of organic waste gas during operation, posing a threat to the environment and human health. Among them, the sandblasting workshop mainly uses high-speed spraying of sand particles to clean or change the surface of the workpiece. However, in this process, the friction between the sand particles and the surface of the workpiece may produce some tiny particles and waste gas. Although these are mainly inorganic substances, they may also contain a small amount of organic matter. The spray painting workshop is the main source of organic waste gas pollution. The paint used in the spray painting operation contains a large amount of organic solvents, which will evaporate during the spraying and curing process to form volatile organic compounds (VOCs). VOCs mainly include harmful substances such as benzene, toluene, and xylene. They are colorless and irritating. Long-term exposure to these waste gases will have a serious impact on human health.

[0003] Common processes for treating organic waste gas in paint shops include the following: ① Activated carbon adsorption method: Use the porosity of activated carbon to adsorb organic matter in waste gas. However, this method has several disadvantages: First, the adsorption capacity of activated carbon is limited, and it needs to be replaced or regenerated after saturation, and the operating cost is high. Secondly, the regeneration process requires special equipment, which occupies a large area and consumes a lot of energy. Finally, for waste gas with high concentration or high temperature, the adsorption effect of activated carbon may be reduced. ② Catalytic combustion method: Use a catalyst to burn organic waste gas at a lower temperature and convert it into harmless substances. Although this method is highly efficient, it has certain requirements for the concentration and temperature of the waste gas and is not suitable for all situations. In addition, the selection and use conditions of the catalyst also need to be strictly controlled, otherwise it may affect the catalytic effect. ③ Photocatalysis: Use ultraviolet light to irradiate the waste gas and crack the organic matter to achieve the purpose of purifying the waste gas. However, this method may require high energy consumption and have high requirements for equipment. In addition, there are waste gas treatment processes such as direct combustion method, washing absorption method, and isolation method. Each process has its applicable occasions and limitations. The intermittent working cycle and large differences in production conditions in the paint shop lead to large fluctuations in exhaust gas concentration, which brings great challenges to exhaust gas treatment. Therefore, there is an urgent need for a treatment system suitable for paint shops with large fluctuations in exhaust gas concentration. Utility Model Content

[0004] The utility model provides an organic waste gas recycling and resource treatment system suitable for a coating workshop, so as to overcome the defects of the prior art.

[0005] To achieve the above-mentioned purpose, the utility model provides an organic waste gas recycling resource treatment system suitable for a paint shop, which has the following characteristics: it includes an air intake pipe, a concentration detector, a diverter valve, a high-concentration waste gas pipe, a heat storage chamber incinerator, a low-concentration waste gas pipe, a zeolite rotor, a drying heat exchanger and a drying gas air intake pipe; one end of the air intake pipe is connected to the paint shop, and the other end is connected to the high-concentration waste gas pipe and the low-concentration waste gas pipe through the diverter valve; the concentration detector is arranged on the air intake pipe; the high-concentration waste gas pipe is connected to the inlet of the heat storage chamber incinerator; the low-concentration waste gas pipe is connected to the inlet of the zeolite rotor adsorption zone; the outlet of the adsorption zone of the zeolite rotor is connected to the inlet of the hot fluid channel of the drying heat exchanger, and the drying gas air intake pipe, the cold fluid channel of the drying heat exchanger and the paint shop are connected in sequence.

[0006] Furthermore, the outlet of the desorption zone of the zeolite wheel is connected to a high-concentration exhaust gas pipe.

[0007] Furthermore, the system also includes a desorption gas inlet pipe and a desorption gas heat exchanger; the outlet of the heat storage chamber incinerator is connected to the hot fluid channel inlet of the desorption gas heat exchanger, and the desorption gas inlet pipe, the cold fluid channel of the desorption gas heat exchanger and the desorption zone inlet of the zeolite wheel are connected in sequence.

[0008] Furthermore, a desorption temperature detector is provided between the cold fluid channel of the desorption gas heat exchanger and the desorption zone of the zeolite wheel.

[0009] Furthermore, the system also includes a chimney; the hot fluid channel outlet of the desorption gas heat exchanger is connected to the chimney.

[0010] Furthermore, the hot fluid channel outlet of the drying heat exchanger is connected to the chimney.

[0011] Furthermore, a combustion temperature detector is provided between the desorption zone of the zeolite wheel and the high-concentration exhaust gas pipe.

[0012] Furthermore, a fume filter is provided on the high-concentration exhaust gas pipe.

[0013] Furthermore, a smoke filter is provided on the low-concentration exhaust gas pipe.

[0014] Furthermore, a concentration alarm LEL is provided at the entrance of the regenerator incinerator.

[0015] The beneficial effects of the utility model are:

[0016] 1. Reduce the difficulty of waste gas treatment. Due to the complex composition of waste gas and large differences in working conditions, traditional waste gas treatment methods often face the problems of great difficulty in treatment and waste of treatment energy. The utility model system uses "waste gas diversion" to allow high-concentration waste gas to enter the RTO, and converts large air volume and low-concentration organic waste gas into small air volume and medium-high concentration organic waste gas before entering the RTO, thereby reducing the treatment difficulty and energy consumption of subsequent RTO equipment.

[0017] 2. Improve the efficiency of waste gas treatment. RTO equipment uses high-temperature oxidation technology to efficiently burn the organic waste gas and high-concentration waste gas desorbed by the adsorption wheel, converting them into harmless carbon dioxide and water. This process not only has high treatment efficiency, but also ensures complete purification of waste gas.

[0018] 3. Improve the utilization rate of waste gas. First, the heat of the purified gas discharged by RTO is used to heat the desorbed gas, without the need for additional heat to preheat the desorbed gas, and the residual heat of RTO combustion is effectively utilized, thereby improving the utilization rate of waste gas. In addition, the heat of the purified gas discharged by the zeolite wheel is used to heat the drying gas in the painting workshop, without the need for additional heat to preheat the drying gas, and the adsorption heat of the zeolite wheel is fully utilized to make resource utilization of the waste gas.

[0019] Therefore, this system combines the pollution characteristics of the paint shop. On the basis of the traditional adsorption wheel + RTO method, it uses the waste gas concentration diversion collection method to directly send high-concentration waste gas into the RTO for incineration, and low-concentration waste gas enters the rotor for concentration and then enters the RTO for treatment. At the same time, the gas after combustion and adsorption is recycled, realizing efficient, energy-saving and resource-based treatment of waste gas in the paint shop. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of an organic waste gas recycling and resource treatment system suitable for a paint shop;

[0021] Figure 2 It is a schematic diagram of the structure of part of the system for treating high-concentration exhaust gas;

[0022] Figure 3 It is a schematic diagram of the structure of part of the system for treating low-concentration exhaust gas. DETAILED DESCRIPTION

[0023] The specific implementation of the present utility model is described below with reference to the accompanying drawings.

[0024] As Figures 1 to 3As shown, the utility model provides an organic waste gas recycling and resource treatment system suitable for a paint shop, including an air intake pipe 11, a concentration detector 12, a diverter valve 13, a high-concentration waste gas pipe 21, a heat storage chamber incinerator 22, a low-concentration waste gas pipe 31, a zeolite wheel 32, a drying gas intake pipe 41, a drying heat exchanger 42, a desorption gas intake pipe 51, a desorption gas heat exchanger 52 and a chimney 6.

[0025] One end of the air intake pipe 11 is connected to the paint shop, and the other end is connected to the high-concentration exhaust pipe 21 and the low-concentration exhaust pipe 31 through the diverter valve 13. The concentration detector 12 is arranged on the air intake pipe 11 to detect the concentration of the exhaust gas in the air intake pipe 11, and the connection between the diverter valve 13 and the high-concentration exhaust pipe 21 and the low-concentration exhaust pipe 31 is controlled according to the detection result. The high-concentration exhaust pipe 21 is connected to the inlet of the regenerator incinerator 22. The high-concentration exhaust gas in the high-concentration exhaust pipe 21 is burned in the regenerator incinerator 22. Under high temperature conditions, the combustible organic matter in the high-concentration exhaust gas undergoes a thermal oxidation reaction under the action of the catalyst to achieve degradation. The low-concentration exhaust pipe 31 is connected to the inlet of the adsorption zone of the zeolite wheel 32. The adsorption zone of the zeolite wheel 32 adsorbs the exhaust gas in the low-concentration exhaust pipe 31.

[0026] The outlet of the adsorption zone of the zeolite rotor 32, the hot fluid channel of the drying heat exchanger 42 and the chimney 6 are connected in sequence, and the drying gas inlet pipe 41 provided with a fan, the cold fluid channel of the drying heat exchanger 42 and the painting workshop are connected in sequence. The gas adsorbed by the zeolite rotor 32 enters the hot fluid channel of the drying heat exchanger 42, and heats the drying gas entering the cold fluid channel. The purified gas after heat exchange is discharged through the chimney 6; the heated drying gas enters the painting workshop to dry the painting equipment, that is, the zeolite rotor 32 releases adsorption heat during the adsorption process, and the adsorption heat is transferred to the drying gas in the drying heat exchanger 42.

[0027] The outlet of the regenerator incinerator 22, the hot fluid channel of the desorption gas heat exchanger 52 and the chimney 6 are connected in sequence, and the desorption gas inlet pipe 51 provided with a fan, the cold fluid channel of the desorption gas heat exchanger 52, the desorption zone of the zeolite rotor 32 and the high-concentration exhaust gas pipe 21 are connected in sequence. The gas after combustion in the regenerator incinerator 22 enters the hot fluid channel of the desorption gas heat exchanger 52, and heats the desorption gas entering the cold fluid channel. The purified gas after heat exchange is discharged through the chimney 6; the heated desorption gas enters the desorption zone of the zeolite rotor 32 for desorption, and the high-concentration exhaust gas after desorption enters the high-concentration exhaust gas pipe 21, and enters the regenerator incinerator 22 for combustion together with the high-concentration exhaust gas from the paint shop.

[0028] In a preferred embodiment, a desorption temperature detector 53 is provided on the pipeline between the cold fluid channel of the desorption gas heat exchanger 52 and the desorption zone of the zeolite rotor 32 to monitor whether the desorption gas entering the desorption zone of the zeolite rotor 32 meets the desorption requirements.

[0029] In a preferred embodiment, a combustion temperature detector 54 is provided on the pipeline between the desorption zone of the zeolite wheel 32 and the high-concentration exhaust gas pipe 21 for monitoring the temperature of the gas entering the high-concentration exhaust gas pipe 21 to ensure the heat temperature of the regenerator incinerator 22.

[0030] In a preferred embodiment, a concentration alarm LEL 23 is provided at the entrance of the regenerative chamber incinerator 22. After the high-concentration waste gas and the desorbed waste gas of the zeolite wheel 32 are determined to be safe by the concentration alarm LEL 23, they enter the regenerative chamber incinerator for combustion purification.

[0031] In a preferred embodiment, both the high-concentration exhaust pipe 21 and the low-concentration exhaust pipe 31 are provided with a flue gas filter 7. The flue gas filter 7 removes fine particles and part of the liquid in the exhaust gas, ensuring the normal operation of the subsequent regenerator incinerator 22 and the zeolite wheel 32.

[0032] The treatment method of the organic waste gas recycling and resource treatment system applicable to the painting workshop is as follows: the waste gas generated by any painting workshop is collected by the air duct and enters the air intake pipe 11, and then the concentration of the waste gas in the painting workshop is detected by the concentration detector 12, and enters the high-concentration waste gas pipe 21 or the low-concentration waste gas pipe 31 through the diverter valve 13 according to the detected concentration information for subsequent treatment. Specifically, the waste gas with a concentration higher than 500ppm enters the high-concentration waste gas pipe 21 for combustion treatment, and the waste gas with a concentration lower than 500ppm enters the low-concentration waste gas pipe 31 for zeolite adsorption treatment.

[0033] The high-concentration exhaust gas entering the high-concentration exhaust gas pipe 21 is filtered by the flue gas filter 7 and then enters the regenerator incinerator 22 for combustion. The purified gas enters the desorption heat exchanger for heat recovery and is finally discharged from the chimney 6.

[0034] The low-concentration exhaust gas entering the low-concentration exhaust gas pipe 31 is filtered by the flue gas filter 7 and then enters the adsorption area of ​​the zeolite wheel 32 for adsorption. The adsorbed and purified gas enters the drying heat exchanger 42 to recover heat and is finally discharged from the chimney 6.

[0035] After the zeolite in the adsorption zone of the zeolite rotor 32 reaches adsorption saturation, it rotates to the desorption zone for desorption. Specifically, the desorbed gas entering the system first enters the desorption heat exchanger to be heated by the combustion-purified gas from the regenerator incinerator 22, and then enters the desorption zone of the zeolite rotor 32 to desorb the zeolite rotor 32. The desorbed high-concentration exhaust gas enters the high-concentration exhaust gas pipe 21 and enters the regenerator incinerator 22 for combustion together with the filtered high-concentration exhaust gas from the paint shop.

[0036] The drying gas entering the system first enters the drying heat exchanger 42 to be heated by the adsorbed and purified gas from the zeolite wheel 32, and then enters each coating workshop to dry the equipment and appliances therein.

[0037] This series of processes ensures the effective treatment of organic waste gas and meets environmental emission standards.

[0038] It should be noted that the terms such as "upper", "lower", "left", "right", "front", "back", etc. used in the present invention are only for the convenience of description and are not intended to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships shall be deemed to be within the scope of implementation of the present invention without substantially changing the technical content.

[0039] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An organic waste gas recycling and resource treatment system suitable for a paint shop, characterized by: It includes an air intake pipe, a concentration detector, a diverter valve, a high-concentration exhaust pipe, a regenerator incinerator, a low-concentration exhaust pipe, a zeolite wheel, a drying heat exchanger and a drying gas intake pipe; One end of the air intake pipe is connected to the paint shop, and the other end is connected to the high-concentration exhaust pipe and the low-concentration exhaust pipe through a diverter valve; the concentration detector is set on the air intake pipe; The high-concentration exhaust gas pipe is connected to the inlet of the regenerator incinerator; The low-concentration exhaust gas pipe is connected to the inlet of the zeolite wheel adsorption zone; The outlet of the adsorption zone of the zeolite wheel is connected to the inlet of the hot fluid channel of the drying heat exchanger, and the drying gas inlet pipe, the cold fluid channel of the drying heat exchanger and the coating workshop are connected in sequence.

2. The organic waste gas recycling and resource treatment system suitable for a paint shop according to claim 1 is characterized in that: in, The outlet of the desorption zone of the zeolite wheel is connected to a high-concentration exhaust gas pipe.

3. The organic waste gas recycling and resource treatment system suitable for a paint shop according to claim 2 is characterized in that: in, The system also includes a desorbed gas inlet pipe and a desorbed gas heat exchanger; The outlet of the regenerator incinerator is connected to the hot fluid channel inlet of the desorption gas heat exchanger, and the desorption gas inlet pipe, the cold fluid channel of the desorption gas heat exchanger and the desorption zone inlet of the zeolite wheel are connected in sequence.

4. The organic waste gas recycling and resource treatment system suitable for a paint shop according to claim 3 is characterized in that: in, A desorption temperature detector is provided between the cold fluid channel of the desorption gas heat exchanger and the desorption zone of the zeolite wheel.

5. The organic waste gas recycling and resource treatment system suitable for a paint shop according to claim 3 is characterized in that: in, The system also includes a chimney; The hot fluid channel outlet of the desorption gas heat exchanger is connected to the chimney.

6. The organic waste gas recycling and resource treatment system suitable for a paint shop according to claim 5 is characterized in that: in, The hot fluid channel outlet of the drying heat exchanger is connected to the chimney.

7. The organic waste gas recycling and resource treatment system suitable for a paint shop according to claim 2 is characterized in that: in, A combustion temperature detector is provided between the desorption zone of the zeolite wheel and the high-concentration exhaust gas pipe.

8. The organic waste gas recycling and resource treatment system suitable for a paint shop according to claim 1 is characterized in that: in, The high-concentration exhaust gas pipe is provided with a smoke filter.

9. The organic waste gas recycling and resource treatment system suitable for a paint shop according to claim 1 is characterized in that: in, The low-concentration exhaust gas pipe is provided with a smoke filter.

10. The organic waste gas recycling and resource treatment system suitable for a paint shop according to claim 1 is characterized in that: in, A concentration alarm LEL is provided at the entrance of the regenerator incinerator.

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