Oil smoke and waste gas purification system of setting machine

Abstract

The utility model belongs to the technical field of lampblack waste gas treatment, and particularly relates to a lampblack waste gas purification system of a setting machine, which comprises a smoke pipe spray header pipe, a smoke pipe spray header pipe and a smoke pipe spray header pipe, an air inlet of the induced draft fan is connected with the air outlet end of the smoke pipe spraying header pipe; the air inlet end of the vertical spraying tank is connected with the air outlet of the induced draft fan; a plurality of groups of nozzles are arranged in the vertical spraying tank; the air inlet end of the heat exchanger is connected with the air outlet of the vertical spraying tank; a cooling liquid circulating pipeline and a plurality of layers of dehydration plates are arranged in the heat exchanger; the cooling liquid circulating pipeline is communicated with one cooling tower; and the bottom of the high-voltage electrostatic dust collection tower is communicated with the air outlet end of the heat exchanger. The working environment of workers can be improved, the environment air quality inside and outside a factory area is improved, and good market application prospects are achieved.

Description

Technical Field

[0001] This utility model belongs to the field of oil fume and exhaust gas treatment technology, specifically relating to an oil fume and exhaust gas purification system for a stenter. Background Technology

[0002] High-temperature setting machines generate oily fumes during fabric processing, primarily composed of organic compounds such as alkanes, aliphatic compounds, esters, alcohols, ketones, aldehydes, heterocyclic amines, polycyclic aromatic hydrocarbons, and mutagens. These fumes can negatively impact the lungs and respiratory tract, and contain cytotoxic substances that can cause various biological effects, including carcinogenicity, mutagenicity, and reduced immunity.

[0003] Oil fume emissions negatively impact public health and pose significant health risks. With increasingly stringent environmental regulations, municipal environmental protection departments place great emphasis on energy conservation and emission reduction. According to relevant environmental requirements, the fumes generated by the stenter must undergo electrostatic spraying treatment to meet emission standards before being released. To improve the working environment for workers, protect their physical and mental health, and enhance air quality both inside and outside the factory area, this application proposes an oil fume purification system for stenters. This system ensures that treated pollutants meet relevant local emission standards while improving the working environment for workers, reducing pollution to the surrounding environment, and simultaneously promoting the rational recycling of resources.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a purifying system for oil fume exhaust from a stenter machine, so as to improve the working environment of workers and enhance the air quality inside and outside the factory area.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A stenter oil fume purification system includes:

[0008] The main smoke spray pipe has its air inlet end connected to the exhaust ducts of multiple stenters;

[0009] An induced draft fan, the air inlet of which is connected to the air outlet of the main flue spray pipe;

[0010] A vertical spray tank, the air inlet of which is connected to the air outlet of the induced draft fan; the vertical spray tank is equipped with multiple sets of spray heads inside;

[0011] A heat exchanger, the air inlet of which is connected to the air outlet of the vertical spray tank; the heat exchanger is equipped with a coolant circulation pipe and multiple dehydration plates inside; the coolant circulation pipe is connected to a cooling tower;

[0012] The high-voltage electrostatic precipitator tower has a chimney at the top and is connected to the outlet of the heat exchanger at the bottom.

[0013] Preferably, the vertical spray tank includes a primary spray tank and a secondary spray tank that are interconnected; the primary spray tank is connected to the air outlet of the induced draft fan, and the secondary spray tank is connected to the air inlet of the heat exchanger.

[0014] Preferably, an oil-water separator is connected to the bottom of the primary spray tank and the secondary spray tank. The oil-water separator is connected to the primary spray tank, the secondary spray tank and the heat exchanger through a pipeline. The outlet of the oil-water separator is connected to the cooling tower through a pipeline, and the outlet at the top of the cooling tower is connected to the spray nozzle through a pipeline.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) The stenter oil fume exhaust gas purification system of this utility model can collect the exhaust gas discharged from the stenter into the smoke pipe spray main pipe, so that the high temperature exhaust gas discharged from the stenter can be cooled by water spray atomization at the first time, thereby achieving the first layer of purification and greatly reducing the risk of fire in the purification system.

[0017] (2) The stenter oil fume exhaust gas purification system of this utility model removes the stenter exhaust fan and adds electric damper adjustment. The exhaust volume of the flue gas is precisely controlled by the electric damper. Without obstructing the wind or dripping oil, the heat energy of the stenter can be effectively reduced, thereby achieving the effect of energy saving and emission reduction.

[0018] (3) The stenter oil fume exhaust gas purification system of this utility model replaces the induced draft fan with a permanent magnet motor, which can maximize energy saving. Furthermore, by installing the induced draft fan in front of the secondary spray and using positive pressure blowing, the number of bends in the exhaust pipe is greatly reduced, thereby reducing wind resistance. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the system process flow of this utility model;

[0020] Figure 2 This is a schematic diagram showing the connection between this utility model and the exhaust gas duct of the stenter;

[0021] Figure 3 This is a schematic diagram of the system equipment installation and unfolding of this utility model;

[0022] Figure 4This is a schematic diagram of an oil-collecting and water-separating device;

[0023] Explanation of key figure labels:

[0024] 1. Exhaust fan; 2. Vertical spray tank; 3. Heat exchanger; 4. Dehydration plate; 5. High-voltage electrostatic precipitator; 6. Oil-water separator; 7. Cooling tower. Detailed Implementation

[0025] The technical solution of this utility model patent will be clearly and completely described below. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on the utility model.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] See attached document Figure 1-4 A stenter oil fume purification system, wherein the various devices are erected on a steel frame platform, specifically including:

[0029] The main smoke spray pipe has its air inlet end connected to the exhaust ducts of multiple stenters;

[0030] The exhaust fan 1 has its air inlet connected to the air outlet of the flue spray main;

[0031] Vertical spray tank 2, which is equipped with multiple sets of spray heads; vertical spray tank 2 includes a primary spray tank and a secondary spray tank that are interconnected; the primary spray tank is connected to the air outlet of the induced draft fan 1, and the secondary spray tank is connected to the air inlet of the heat exchanger 3.

[0032] The heat exchanger 3 has its air inlet connected to the air outlet of the vertical spray tank 2; the heat exchanger 3 is equipped with a coolant circulation pipe and a multi-layer dehydration plate 4; the coolant circulation pipe is connected to a cooling tower 7, and a cooling tower water pump is installed outside the cooling tower 7.

[0033] Oil-water separator 6 connects the bottom of the primary spray tank, the secondary spray tank, and the heat exchanger 3, and is used to separate grease and wastewater; the outlet of oil-water separator 6 is connected to cooling tower 7 through a pipe, and the outlet of the top of cooling tower 7 is connected to each nozzle through a pipe; the wastewater generated after the oil fume exhaust gas purification is discharged to the factory wastewater treatment system.

[0034] The high-voltage electrostatic precipitator 5 has a chimney at the top and is connected to the outlet of the heat exchanger 3 at the bottom. The high-voltage electrostatic precipitator 5 consists of a spray filtration zone and a high-voltage electrostatic dust collection zone. In the spray filtration zone, most of the yarn and lint are removed and the temperature is reduced. The flue gas and odor are treated by ozone oxidation and adsorption generated by high-voltage electrostatics and then discharged in compliance with standards.

[0035] Vertical spray tank 2 thoroughly washes the high-temperature oil fumes, removing approximately 70% of the oil, particulate matter, and volatile organic compounds. The cooled water vapor then enters heat exchanger 3, where dehydration plates 4 remove large oil particles and water droplets, achieving a decontamination rate of approximately 10%. Finally, the low-temperature oil-water mist is filtered by high-voltage electrostatic precipitator 5 to remove residual oil, and particulate matter and VOCs removal rates reach approximately 15%, achieving environmentally compliant emissions.

[0036] In this embodiment, the high-voltage electrostatic precipitator tower 5 is made of SUS201 stainless steel, and its internal dimensions are L×B×H=3.48m×2.5m×7.1m; the tower height is 11000mm; and the water supply pressure is 3kg / cm². 2 The system has 149 electrostatic tubes; 6-8 electrostatic operation levels; empty tower velocity V = 3.65 m / s; inlet flue gas velocity V = 13.8 m / s; processing capacity Q = 60000 m³ / h; resistance loss 300-500 Pa; and oil fume removal efficiency ≥ 90%.

[0037] The vertical spray tank 2 consists of 2 units; the material is SUS201 stainless steel; the number of 3 sets of 304 stainless steel spray heads is 18; the atomization coverage rate is 81%; the air volume Q = 60000 m³ / h; the flow velocity V = 5.86 m / s; and the water supply pressure is 3 kg / cm². 2 The internal dimensions of the main body are: L×B×H=1.5m×1.5m×4.8m.

[0038] The heat exchanger 3 consists of one unit; the material is SUS201; the external dimensions are L×B×H=5.0m×2.2m×2.2m; the processing capacity is Q=60000m3 / h; and the equipment resistance is 150~200Pa h.

[0039] The oil-water separator consists of one unit; the material is SUS201 stainless steel; the internal dimensions are L×B×H=4.0m×1.5m×1.8m; the effective volume is 4.32m³. 3 .

[0040] The number of exhaust fans is 1; the motor is a permanent magnet motor; the material is Q235; the model is 8-59-12A; the power is 37Kw; the air volume is 68000~75000m3 / h; and the air pressure is 1100~1350Pa.

[0041] This embodiment also includes one spray water pump and one cleaning water pump. The pump model is GD80-21 pipeline centrifugal pump; flow rate Q=42m3 / h; head H=21m; power N=4kw. The high-voltage electrostatic precipitator tower 5 has one chimney at the top; the material is Q235; the specification is Φ1200, H=15m.

[0042] The styling machine fume purification system in this embodiment adopts fully computerized intelligent control. The main control system uses a MITSUBISHI PLC, which features a high degree of intelligence in debugging and operation, and accurate data. To collect the exhaust gas into the main spray pipe, the exhaust pipe needs to be modified from the rooftop outlet of the styling machine, allowing the exhaust gas to converge and facilitating its subsequent entry into the styling machine fume purification system for purification. The fumes emitted by the styling machine are high-temperature exhaust gases, reaching temperatures of 100℃~180℃, and are quite large. Therefore, the exhaust gas needs to be sprayed first. The powerful water flow within the vertical spray tank 2 ensures full contact with the exhaust gas and provides excellent cooling.

[0043] Multiple nozzles are installed inside the vertical spray tank 2. High-pressure circulating water is atomized through the nozzles to form a high-density water mist, which comes into close contact with the fibers and oil mist in the exhaust gas from the stenter. The water mist can condense the fiber and oil mist particles. Larger water droplets with fibers and oil mist will settle down, while finer water droplets will enter the dehydration zone with the exhaust gas. Under the centrifugal force in the dehydration zone, the fine water droplets will be collected and sent to the oil-water separator 6 for treatment. The purified exhaust gas after dehydration enters the next stage of treatment. On the other hand, the exhaust gas is fully moistened and its temperature is further reduced, which is beneficial for the subsequent treatment of the exhaust gas by the wet high-pressure electrostatic precipitator 5.

[0044] The vertical spray tank 2 includes an interconnected primary spray tank and a secondary spray tank, adopting a two-stage spray design. The front section is a regular spray, while the rear section adds two rows of Venturi tubes. Utilizing the Venturi principle, the waste gas flow rate is varied, creating pressure changes that cause water particles in the waste gas to combine into larger water droplets, making dehydration easier in the final dehydration stage and thus reducing the occurrence of water condensation mist.

[0045] Oil-water separator 6 employs a combination of gravity, biochemical, and mechanical methods to automatically separate sludge and oil from oily wastewater. Through ingenious design of the internal structure of the non-powered oil-water separator 6, based on shallow sedimentation theory, the principle of countercurrent flow separation, and the relationship between turbulent and laminar flow, the flow velocity of wastewater decreases and the water flows downward as it passes through the oil-water separator 6, allowing the floating oil to be separated, recycled, and sold.

[0046] Because the temperature of the return spray water after flue gas scrubbing is relatively high, good heat dissipation is essential. The water temperature should ideally be controlled below 60℃ for optimal oil-water separation. To prevent the separated waste oil from becoming free-floating, an oil-water collection and separation device can be installed to avoid affecting the oil-water separation and discharge efficiency. To ensure effective grease collection and fully consider the backflow of spray water during start-up and shutdown, the device is specially designed with multiple buffer tanks. It is compact and practical in appearance. (See attached diagram.) Figure 4 .

[0047] To ensure the efficient operation of the high-voltage electrostatic precipitator 5, secondary cooling is required. Water spraying and filtration lowers the temperature to between 60℃ and 80℃, while further cooling via heat exchanger 3 and cooling tower 7 reduces the temperature to between 40℃ and 60℃, allowing the high-voltage electrostatic precipitator 5 to operate under optimal conditions and achieve the best dust removal effect. To maximize heat exchange and cooling, this system uses finned heat exchange tubes with excellent heat transfer properties. Because of the mechanically wound fins, the finned heat exchanger has a large and tight contact surface between the fins and the heat exchange tubes, resulting in good and stable heat transfer performance. Air resistance is low, and as water flows through the steel pipes, heat is transferred through the fins tightly wound around the steel pipes to the air passing between the fins, thus cooling the air.

[0048] This utility model's stenter oil fume purification system incorporates technical improvements in the stenter's exhaust fan, exhaust duct, purification equipment layout, and flue gas control. By adding an automatic water spray cleaning and fire extinguishing system to the exhaust duct, the high-temperature flue gas discharged from the stenter is cooled by water spray atomization immediately, achieving the first layer of purification and significantly reducing the risk of fire within the purification system. Precise control of the flue gas discharge through electric dampers, without obstructing airflow or dripping oil, effectively reduces heat emissions from the stenter by removing the exhaust fan. The total power of the auxiliary exhaust motor for each stenter is 16.5 kW, saving the cost of three auxiliary exhaust motors, thus achieving energy conservation and emission reduction. Furthermore, the recycling of waste oil reduces waste and achieves energy savings.

[0049] The existing purification equipment's induced draft fan 1 uses a conventional motor, which has the disadvantage of high energy consumption. Furthermore, the induced draft fan 1 is installed after the high-voltage electrostatic precipitator 5 and uses negative pressure for exhaust, resulting in too many bends in the exhaust pipe and hindering smoke extraction. In this embodiment, the induced draft fan 1 is replaced with a permanent magnet motor, maximizing energy savings. Additionally, by installing the induced draft fan 1 before the secondary spray system and using positive pressure blowing, the number of bends in the exhaust pipe is significantly reduced, thereby reducing wind resistance.

[0050] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the present invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the present invention, as well as various different choices and variations. The scope of the present invention is intended to be defined by the claims and their equivalents.

Claims

1. A setting machine oil fume exhaust gas purification system characterized by comprising: The application relates to a smoke pipe spraying system for a tire curing machine. The system comprises: a smoke pipe spraying main pipe, the air inlet of which is connected with the exhaust air pipe of a plurality of tire curing machines; an air induction fan, the air inlet of which is connected with the air outlet of the smoke pipe spraying main pipe; a vertical spraying tank, the air inlet of which is connected with the air outlet of the air induction fan, and the inside of the vertical spraying tank is provided with a plurality of groups of spraying heads; a heat exchanger, the air inlet of which is connected with the air outlet of the vertical spraying tank, and the inside of the heat exchanger is provided with a cooling liquid circulating pipe and a plurality of layers of dehydration plates, and the cooling liquid circulating pipe is communicated with a cooling tower; 2. The setting machine oil fume exhaust gas purification system according to claim 1, characterized by a high-voltage electrostatic dust removal tower, the top of which is provided with a chimney, and the bottom of which is communicated with the air outlet of the heat exchanger.

3. The calender oil fume exhaust purification system according to claim 2, characterized by The vertical spraying tank comprises a first-stage spraying tank and a second-stage spraying tank which are communicated with each other, the first-stage spraying tank is connected with the air outlet of the air induction fan, and the second-stage spraying tank is connected with the air inlet of the heat exchanger. The bottom of the first-stage spraying tank and the second-stage spraying tank is connected with an oil-water separator, the oil-water separator is communicated with the first-stage spraying tank, the second-stage spraying tank and the heat exchanger through pipes, the water outlet of the oil-water separator is communicated with the cooling tower through a pipe, and the water outlet at the top of the cooling tower is connected with the spraying head through a pipe.

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