Dry tail gas wet-type high-pressure back-blowing cyclone dust removal equipment

Abstract

The utility model relates to wet-type high-pressure blowback cyclone dust removal equipment for dry tail gas, and belongs to the technical field of tail gas treatment. Comprising a wet-process high-pressure reverse-blowing cyclone dust removal tower, a separation tower is connected behind an outlet of the wet-process high-pressure reverse-blowing cyclone dust removal tower, the wet-process high-pressure reverse-blowing cyclone dust removal tower comprises a dust removal tower body, an inlet is formed in the top of the dust removal tower body, and an outlet is formed in the bottom of the dust removal tower body; an upper-layer right-handed rotational flow plate, a left-handed rotational flow plate and a lower-layer right-handed rotational flow plate are sequentially arranged in the dust removal tower body at intervals from top to bottom, and an inner cavity of the dust removal tower body is divided into an upper cavity, a middle cavity and a lower cavity by the upper-layer right-handed rotational flow plate, the left-handed rotational flow plate and the lower-layer right-handed rotational flow plate; the upper cavity is internally provided with an upper-layer left-rotating back-blowing device and an atomized tackifier spraying device, and the middle cavity and the lower cavity are internally provided with a right-rotating back-blowing device and a lower-layer left-rotating back-blowing device respectively. The device has the beneficial effects that the device can efficiently and effectively separate gas and dirt, stop viscous particle harmful objects and release qualified and clean gas.

Description

Technical Field

[0001] The utility model relates to a wet high-pressure reverse-blowing cyclone dust removal device for drying tail gas, belonging to the technical field of tail gas treatment. Background Art

[0002] The medium-density fiberboard drying waste gas treatment device is mainly a device for filtering and purifying waste gases such as formaldehyde generated during the drying process of fiberboard to make them meet the emission standards. In the fiberboard production process, the drying system is a process of drying wood fiber raw materials in a hot air pipeline. A cyclone dust collector is arranged at the tail of this drying process to separate and discharge the hot air tail gas after drying the wood fiber raw materials. Since this drying process is contact heat transfer, the hot air will carry away some fiber dust. Therefore, the discharged drying tail gas will contain particulate matter and formaldehyde. It must be dust-removed and formaldehyde-removed before being directly discharged into the atmosphere to achieve up-to-standard discharge.

[0003] Currently, some traditional treatment methods on the market, such as water film dust removal systems and wet electrostatic dust removal systems, have high energy consumption, large investment, large floor space, and some extremely high spontaneous combustion risks. After years of verification in the medium-density fiberboard industry, these methods are not optional.

[0004] The patent with the patent number CN202023271292.2 discloses a drying tail gas treatment system for artificial fiberboard. It includes an absorption tower and an absorption tower inlet pipe connected thereto. A plurality of washing nozzles are arranged in the absorption tower. The absorption tower liquid outlet is arranged at the bottom of the absorption tower and is connected to the inlet of the absorption tower circulation pump. The outlet of the absorption tower circulation pump is connected to a recovery pipeline; the washing water treatment system includes a formaldehyde removal reactor connected to an external discharge regulating valve. The outlet pipe of the formaldehyde removal reactor is connected to a filter. A screen is arranged in the filter and is connected to a clean water tank and a slag liquid tank. A clean water pump is arranged in the clean water tank and is connected to the absorption tower circulation pipeline.

[0005] Although the above patent can achieve the function of tail gas treatment, the current technology is not comprehensive enough and has the following disadvantages: it does not have a wet high-pressure reverse-blowing cyclone dust removal tower, and it is impossible to fully mix harmful substances such as tackifiers and particulate matter and formaldehyde discharged from the drying cyclone, resulting in poor treatment effect in the later separation tower.

[0006] To solve one of the above problems, there is an urgent need for a wet high-pressure reverse-blowing cyclone dust removal device for drying tail gas. Utility Model Content

[0007] In view of the deficiencies in the above prior art, the technical problem to be solved by the present utility model is: how to achieve sufficient mixing of the thickener with harmful substances such as particulate matter and formaldehyde discharged from the drying cyclone through a three-stage reverse blowing and flow diversion device, so as to improve the treatment effect in the separation tower. For this purpose, a wet high-pressure reverse blowing cyclone dust removal device for drying tail gas is provided.

[0008] The wet high-pressure reverse blowing cyclone dust removal device for drying tail gas of the present utility model includes a wet high-pressure reverse blowing cyclone dust removal tower. The outlet of the wet high-pressure reverse blowing cyclone dust removal tower is connected to a separation tower. It is characterized in that: the wet high-pressure reverse blowing cyclone dust removal tower includes a dust removal tower body. The top of the dust removal tower body is an inlet, and the bottom is an outlet. Inside the dust removal tower body, an upper right-handed cyclone plate, a left-handed cyclone plate, and a lower right-handed cyclone plate are sequentially arranged at intervals from top to bottom. The upper right-handed cyclone plate, the left-handed cyclone plate, and the lower right-handed cyclone plate divide the inner cavity of the dust removal tower body into an upper cavity, a middle cavity, and a lower cavity. An upper left-handed reverse blowing device and an atomizing thickener spraying device are arranged in the upper cavity. A right-handed reverse blowing device and a lower left-handed reverse blowing device are respectively arranged in the middle cavity and the lower cavity.

[0009] Preferably, the upper left-handed reverse blowing device includes multiple groups of air injection pipes A installed on the inner wall of the dust removal tower body. The multiple groups of air injection pipes A are connected to a first fan through a connecting main pipe A and are supplied with air by the first fan. The multiple groups of air injection pipes A jointly inject air to form an inclined upward left-rotating air flow; the right-handed reverse blowing device includes multiple groups of air injection pipes B installed on the inner wall of the dust removal tower body. The multiple groups of air injection pipes B are connected to a second fan through a connecting main pipe and are supplied with air by the second fan. The multiple groups of air injection pipes B jointly inject air to form an inclined upward right-rotating air flow; the lower left-handed reverse blowing device includes multiple groups of air injection pipes C installed on the inner wall of the dust removal tower body. The multiple groups of air injection pipes C are connected to a third fan through a connecting main pipe C and are supplied with air by the third fan. The multiple groups of air injection pipes C jointly inject air to form an inclined upward left-rotating air flow.

[0010] Preferably, the atomizing thickener spraying device includes a nozzle installed inside the dust removal tower body. An electric proportional valve is installed on the liquid supply pipe connected to the nozzle. The liquid supply pipe is then connected to an atomizer. The thickener pumped into the atomizer is atomized by the atomizer, and the addition amount is controlled by the electric proportional valve and sprayed into the dust removal tower body through the nozzle.

[0011] Preferably, the first fan, the second fan, and the third fan are all ultra-high pressure fans.

[0012] Preferably, the separation tower is an M-type gas pollution separation tower, including a separation tower body. Inside the separation tower body, two sets of aggregating agent atomizing and spraying devices are arranged at intervals, and a perforated sieve plate cooperating with the aggregating agent atomizing and spraying devices. Two aggregating agent atomizing and spraying devices enable harmful objects such as viscous particulate matters to aggregate together again, and then wash the viscous particulate matter harmful objects on the perforated sieve plate to the bottom of the separation tower, and drain them to a dehydrator. The dehydrator dehydrates and extrudes the viscous particulate matter and then incinerates it. The mixture separated by the dehydrator and filtered by the extruder is recycled and added in proportion.

[0013] Preferably, the sewage discharge pipe at the bottom of the separation tower is connected to the dehydrator. The liquid phase outlet of the dehydrator is connected to a water collection tank, which is then connected to a sewage treatment tank, and the sewage treatment tank is then connected to a plate filter press.

[0014] Preferably, the dehydrator is a squeezing dehydrator.

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

[0016] For the wet high-pressure back-blowing cyclone dust removal equipment for drying tail gas of the present utility model, the gas to be cleaned discharged from the drying cyclone is led to the separation tower through the wet high-pressure back-blowing cyclone dust removal tower. Three different-direction back-blowing and turning devices are added outside the body of the dust removal tower. A reverse swirl plate is also added below each layer of the back-blowing and turning device. A high-precision atomizing thickening agent spraying device with proportional addition is also added in the upper part inside the wet high-pressure back-blowing cyclone dust removal tower. Through the three back-blowing and turning devices, the thickening agent is fully mixed with harmful substances such as particulate matter and formaldehyde discharged from the drying cyclone, improving the treatment effect when entering the separation tower.

[0017] For the wet high-pressure back-blowing cyclone dust removal equipment for drying tail gas of the present utility model, the mixed gas pollution is led into the separation tower for separation. There are two layers of gas pollution separation equipment in the separation tower. The gas pollution separation equipment can efficiently separate gas pollution, block viscous particulate harmful objects, and release qualified and clean gas.

[0018] For the wet high-pressure back-blowing cyclone dust removal equipment for drying tail gas of the present utility model, the overall equipment occupies a small space, has low power consumption, high efficiency, low manufacturing cost, and does not require a large foundation. It far exceeds the national emission standards and is an ideal product for treating water and air pollution in the wood industry. Description of the Drawings

[0019] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts do not necessarily draw according to the actual scale.

[0020] Figure 1 is the structural schematic diagram of the present utility model Figure 1 ;

[0021] Figure 2 is the internal structural schematic diagram of the wet high-pressure reverse-blowing cyclone dust removal tower of the present utility model;

[0022] Figure 3 is the structural schematic diagram of the present utility model Figure 2 ;

[0023] In the figure: 1. Wet high-pressure reverse-blowing cyclone dust removal tower 1.1. Dust removal tower body 1.2. Upper right-handed cyclone plate 1.3. Left-handed cyclone plate 1.4. Lower right-handed cyclone plate 1.5. Upper left-handed reverse-blowing device 1.6. Right-handed reverse-blowing device 1.7. Lower left-handed reverse-blowing device 1.8. Atomized thickening agent spraying device 2. Separation tower 3. First fan 4. Second fan 5. Third fan 6. Electric proportional valve 7. Atomizer 8. Polymerizer atomized spraying device 9. Perforated sieve plate 10. Dewatering machine 11. Water collection tank 12. Sewage treatment tank 13. Plate filter press. Specific embodiments

[0024] The following further describes the present utility model in conjunction with the accompanying drawings: The following further illustrates the present utility model through specific embodiments, but it is not used to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present utility model.

[0025] Example 1, as Figure 1-2 shown, the wet high-pressure reverse-blowing cyclone dust removal equipment for drying tail gas includes a wet high-pressure reverse-blowing cyclone dust removal tower 1. The outlet of the wet high-pressure reverse-blowing cyclone dust removal tower 1 is connected to a separation tower 2. The wet high-pressure reverse-blowing cyclone dust removal tower 1 includes a dust removal tower body 1.1. The top of the dust removal tower body 1.1 is the inlet, and the bottom is the outlet. The interior of the dust removal tower body 1.1 is sequentially and spacedly provided with an upper right-handed cyclone plate 1.2, a left-handed cyclone plate 1.3, and a lower right-handed cyclone plate 1.4 from top to bottom. The upper right-handed cyclone plate 1.2, the left-handed cyclone plate 1.3, and the lower right-handed cyclone plate 1.4 divide the inner cavity of the dust removal tower body 1.1 into an upper cavity, a middle cavity, and a lower cavity. An upper left-handed reverse-blowing device 1.5 and an atomized thickening agent spraying device 1.8 are arranged in the upper cavity. A right-handed reverse-blowing device 1.6 and a lower left-handed reverse-blowing device 1.7 are respectively arranged in the middle cavity and the lower cavity.

[0026] The gas to be cleaned discharged from the drying cyclone is led to the separation tower 2 through the wet high-pressure reverse-blowing cyclone dust removal tower 1. Three reverse-blowing and rotating devices in different directions are added outside the body 1.1 of the dust removal tower. A reverse-flow swirling plate is also added below each layer of the reverse-blowing and rotating device. A highly precise atomizing viscosity-increasing agent spraying device with proportional addition is also added in the upper inner part of the wet high-pressure reverse-blowing cyclone dust removal tower 1. Through the three reverse-blowing and rotating devices, the viscosity-increasing agent is fully mixed with harmful substances such as particulate matter and formaldehyde discharged from the drying cyclone, improving the treatment effect when entering the separation tower 2.

[0027] The mixed gas and pollutants are led into the separation tower 2 for separation. There are two layers of gas and pollutant separation equipment in the separation tower 2. The gas and pollutant separation equipment can efficiently separate gas and pollutants, block viscous particulate harmful objects, and release qualified and clean gas.

[0028] Example 2, as Figure 1-2 shown, the wet high-pressure reverse-blowing cyclone dust removal equipment for drying tail gas includes a wet high-pressure reverse-blowing cyclone dust removal tower 1. The outlet of the wet high-pressure reverse-blowing cyclone dust removal tower 1 is connected to a separation tower 2. The wet high-pressure reverse-blowing cyclone dust removal tower 1 includes a dust removal tower body 1.1. The top of the dust removal tower body 1.1 is the inlet, and the bottom is the outlet. An upper right-handed swirling plate 1.2, a left-handed swirling plate 1.3, and a lower right-handed swirling plate 1.4 are sequentially arranged at intervals from top to bottom inside the dust removal tower body 1.1. The upper right-handed swirling plate 1.2, the left-handed swirling plate 1.3, and the lower right-handed swirling plate 1.4 divide the inner cavity of the dust removal tower body 1.1 into an upper cavity, a middle cavity, and a lower cavity. An upper left-handed reverse-blowing device 1.5 and an atomizing viscosity-increasing agent spraying device 1.8 are arranged in the upper cavity. A right-handed reverse-blowing device 1.6 and a lower left-handed reverse-blowing device 1.7 are respectively arranged in the middle cavity and the lower cavity.

[0029] Further, the upper left-handed reverse-blowing device 1.5 includes multiple groups of air injection pipes A installed on the inner wall of the dust removal tower body 1.1. The multiple groups of air injection pipes A are connected to a first fan 3 through a connecting main pipe A and are supplied with air by the first fan 3. The multiple groups of air injection pipes A jointly inject air to form an obliquely upward left-rotating air flow; the right-handed reverse-blowing device 1.6 includes multiple groups of air injection pipes B installed on the inner wall of the dust removal tower body 1.1. The multiple groups of air injection pipes B are connected to a second fan 4 through a connecting main pipe and are supplied with air by the second fan 4. The multiple groups of air injection pipes B jointly inject air to form an obliquely upward right-rotating air flow; the lower left-handed reverse-blowing device 1.7 includes multiple groups of air injection pipes C installed on the inner wall of the dust removal tower body 1.1. The multiple groups of air injection pipes C are connected to a third fan 5 through a connecting main pipe C and are supplied with air by the third fan 5. The multiple groups of air injection pipes C jointly inject air to form an obliquely upward left-rotating air flow.

[0030] Further, the atomizing viscosity increasing agent spraying device 1.8 includes a nozzle installed inside the dust removal tower body 1.1. An electric proportional valve 6 is installed on the liquid supply pipe connected to the nozzle. The liquid supply pipe is then connected to an atomizer 7. The viscosity increasing agent pumped into the atomizer 7 is atomized by the atomizer 7, and the addition amount is controlled by the electric proportional valve 6 and sprayed into the dust removal tower body 1.1 through the nozzle.

[0031] Further, the first blower 3, the second blower 4, and the third blower 5 are all ultra-high pressure blowers.

[0032] Example 3, referring to Figure 3 , which is different from Example 2 in that the separation tower 2 is an M-type gas pollution separation tower, including a separation tower body. Two sets of aggregating agent atomizing spraying devices 8 and a perforated sieve plate 9 cooperating with the aggregating agent atomizing spraying device 8 are arranged at intervals inside the separation tower body. The two aggregating agent atomizing spraying devices 8 cause harmful objects such as viscous particulate matters to aggregate together again, and then wash the viscous particulate matter harmful objects on the perforated sieve plate 9 to the bottom of the separation tower 2 and drain them to the dehydrator 10. The dehydrator 10 dehydrates and extrudes the viscous particulate matter and then incinerates it. The mixture separated by the dehydrator 10 and filtered by the extruder is recycled and added in proportion.

[0033] Further, the dehydrator 10 is a squeezing dehydrator.

[0034] Further, the sewage discharge pipe at the bottom of the separation tower 2 is connected to the dehydrator 10. The liquid phase outlet of the dehydrator 10 is connected to the water collection tank 11. The water collection tank 11 is then connected to the sewage treatment pool 12, and the sewage treatment pool 12 is then connected to the plate filter press 13.

[0035] The water collection tank 11 can cause the viscous particulate matter in the separated clear water to precipitate and coagulate again. The separated viscous particulate matter is pumped to the sewage treatment pool 12 by the sewage pump group to further dissolve harmful substances such as formaldehyde in it.

[0036] Since the extruded particulate matter is not completely dry and will carry a part of water, it is necessary to supplement water from the outside to ensure the water consumption of the circulating water. 10 to 15 tons of clear water is added to the circulating water every day, which can also effectively dilute the concentration of the circulating water.

[0037] After the sewage in the sewage treatment pool 12 is precipitated and flocculated, after the high-concentration water is separated, a part of the clear water enters the high water level of the clear water tank for recycling, and a part of the clear water can be pumped to the production line for use in softening wood blocks and preparing glue. About 10 - 15 tons of the used clear water and the circulating water evaporated naturally from the pipeline are used. In this way, it is necessary to supplement 10 - 15 tons of clear water every day for water circulation, so as to achieve the purpose of zero sewage discharge and full utilization.

[0038] Plate-frame filter press system; the high-concentration water after precipitation is pumped to the plate-frame filter press by the sludge-stage circulation pump. The biggest advantage of the plate-frame filter press is that it can re-press the fine powdery particulate matter after precipitation and flocculation. After re-pressing, the clear water can be directly recycled to the clean water tank for reuse, and the cake-shaped dust blocks squeezed out can enter the boiler and be burned.

[0039] In the actual application of our company, the component of the flocculant is polyaluminum chloride, and the component of the thickener is polyacrylamide. Both are configured into solutions as required. After being treated by the wet high-pressure reverse-blowing cyclone dust removal equipment, the particulate matter in the dry tail gas is effectively blocked. The particulate matter ≤ 30 mg / cubic meter, formaldehyde ≤ 5 mg / cubic meter, and the air fully meets the national standards. The overall equipment occupies a small space, has low power consumption, high efficiency, and low production cost. There is no need to build a huge foundation. Its application effects in the imported production line of Jiangsu Xinyi Huqian Wood Industry and Shandong Dong'e Yuxin Wood Industry Co., Ltd. are very remarkable, far better than the national emission standards. It is an ideal product for treating water and air pollution in the wood industry. (The treatment air volume is not less than 150,000 cubic meters per hour).

[0040] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

[0041] Where the present invention is not described in detail, it is common knowledge to those skilled in the art of this technology.

Claims

1. A dry tail gas wet high-pressure back-blowing cyclone dust removal device, comprising a wet high-pressure back-blowing cyclone dust removal tower (1), wherein the outlet of the wet high-pressure back-blowing cyclone dust removal tower (1) is connected to a separation tower (2), characterized in that: The wet high-pressure back-flushing cyclone dust removal tower (1) comprises a dust removal tower body (1.1); the top of the dust removal tower body (1.1) is an inlet, and the bottom is an outlet; the interior of the dust removal tower body (1.1) is provided with an upper right-handed cyclone plate (1.2), a left-handed cyclone plate (1.3), and a lower right-handed cyclone plate (1.4) in sequence from top to bottom; the upper right-handed cyclone plate (1.2), the left-handed cyclone plate (1.3), and the lower right-handed cyclone plate (1.4) divide the inner cavity of the dust removal tower body (1.1) into an upper cavity, a middle cavity, and a lower cavity; the upper cavity is provided with an upper left-handed back-flushing device (1.5) and an atomized viscosity enhancer injection device (1.8); the middle cavity and the lower cavity are provided with a right-handed back-flushing device (1.6) and a lower left-handed back-flushing device (1.7), respectively.

2. According to claim 1, the dry tail gas wet high pressure back-blowing cyclone dust removal equipment is characterized in that: The upper left-handed reverse-blowing device (1.5) comprises a plurality of groups of jet pipes A installed on the inner wall of the dust removal tower body (1.1), the plurality of groups of jet pipes A being connected to the first fan (3) through a connecting pipe A, being supplied with air by the first fan (3), and the plurality of groups of jet pipes A jointly spraying air to form a left-handed, upwardly inclined, airflow; the right-handed reverse-blowing device (1.6) comprises a plurality of groups of jet pipes B installed on the inner wall of the dust removal tower body (1.1), the plurality of groups of jet pipes B being connected to the second fan (4) through a connecting pipe, being supplied with air by the second fan (4), and the plurality of groups of jet pipes B jointly spraying air to form a right-handed, upwardly inclined, airflow; the lower left-handed reverse-blowing device (1.7) comprises a plurality of groups of jet pipes C installed on the inner wall of the dust removal tower body (1.1), the plurality of groups of jet pipes C being connected to the third fan (5) through a connecting pipe C, being supplied with air by the third fan (5), and the plurality of groups of jet pipes C jointly spraying air to form a left-handed, upwardly inclined, airflow.

3. According to claim 2, the dry tail gas wet high-pressure back-blowing cyclone dust removal equipment is characterized in that: The atomized viscosity enhancer injection device (1.8) comprises a nozzle installed in the dust removal tower body (1.1); an electric proportional valve (6) is installed on a liquid supply pipe connected to the nozzle; the liquid supply pipe is connected to an atomizer (7); the viscosity enhancer pumped into the atomizer (7) is atomized by the atomizer (7), the addition amount is controlled by the electric proportional valve (6), and is sprayed into the dust removal tower body (1.1) through the nozzle.

4. According to claim 3, the dry tail gas wet high-pressure back-blowing cyclone dust removal equipment is characterized in that: The first fan (3), the second fan (4) and the third fan (5) are all ultra-high pressure fans.

5. According to claim 4, the dry tail gas wet high pressure back-blowing cyclone dust removal equipment is characterized in that: The separation tower (2) is an M-type gas pollution separation tower, comprising a separation tower body, wherein two groups of polymerizing agent atomizing injection devices (8) and a flow-through sieve plate (9) cooperating with the polymerizing agent atomizing injection devices (8) are arranged at intervals in the separation tower body.

6. The dry tail gas wet high pressure back-blowing cyclone dust removal equipment according to claim 5 is characterized in that: The sewage pipe at the bottom of the separation tower (2) is connected to a dehydrator (10), the liquid phase outlet of the dehydrator (10) is connected to a water collecting tank (11), the water collecting tank (11) is connected to a sewage treatment tank (12), and the sewage treatment tank (12) is connected to a plate filter press (13).

7. The dry tail gas wet high pressure back-blowing cyclone dust removal equipment according to claim 6 is characterized in that: The dehydrator (10) is an extrusion dehydrator.

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