System and method for treating stink and peculiar smell

Abstract

The invention discloses a system and method for treating stink and peculiar smell, the system comprises a gas inlet pipeline, a hypochlorous acid generating device and a spraying reaction device, the hypochlorous acid generating device comprises a hypochlorous acid generator, and the hypochlorous acid generator is communicated with a hypochlorous acid collecting box and a sodium hydroxide collecting box; the spray reaction device comprises a first-stage spray tower, a second-stage spray tower and a third-stage synergistic reaction tower which are sequentially communicated, and a circulating spray passage formed by the first-stage spray tower, the second-stage spray tower and the third-stage synergistic reaction tower and the circulating water tank. According to the method, a treatment system is used for treating foul odor. The system has the advantages of low cost, good purification effect, small secondary pollution risk and the like, can efficiently remove various foul odors and odors in waste gas when being used for treating different types of foul odors and odors, can effectively improve the surrounding environment of a paper mill, and is beneficial to environmental protection. The method has the advantages of simple process, convenience in operation, low cost, high treatment efficiency, good removal effect and the like, and is less in agent dosage, less in waste liquid yield, more environment-friendly, high in use value and good in application prospect.

Description

Technical Field

[0001] The invention belongs to the field of malodorous gas treatment, and relates to a system and method for treating malodorous gas. Background Art

[0002] The production process of waste paper pulping and paper mill mainly includes the following parts: 1) wet section of paper machine; 2) front drying section; 3) sizing section; 4) rear drying section; 5) coating section, among which the front drying section and rear drying section are the main sources of malodorous gases, including various malodorous gases, such as H2S, SO2 and other malodorous gases, volatile fatty acids, alcohols, benzene, phenols and some greenhouse gases, as well as various chemicals added in the pulping process and various substances and pulp particles carried by the waste paper itself are volatilized in large quantities. In addition, under the high temperature of the drying section, the volatilization of various malodorous gases produces an uncomfortable pungent smell, which has a bad impact on the surrounding environment. At the same time, the high temperature and high humidity of the exhaust gas from the drying section also increase the difficulty of treatment.

[0003] At present, the effective means and devices for treating high-temperature, complex-component malodorous gases from waste paper pulping and papermaking mills mainly include: First, deodorization using a persulfate-based advanced oxidation system. This method has a good treatment effect on malodorous pollutants with good water solubility, but the use of conventional persulfate requires the configuration of related catalysts for treatment, and it is difficult to effectively purify malodorous gases with complex components; second, deodorization using biological methods. However, biological deodorization has a long residence time and is only suitable for small air volume treatment. In addition, the conditions for maintaining biological growth are harsh and it is not well adapted to the complexity of the odorous components of waste paper pulping; third, deodorization using alkaline washing. However, alkaline agents are only effective for acidic gases, and cannot effectively treat characteristic pollutants such as ammonia and trimethylamine, and therefore cannot effectively purify malodorous gases.

[0004] Therefore, obtaining a system and method for treating malodors with low cost, good purification effect and low risk of secondary pollution is of great significance for effectively improving the environment in and around paper mills. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a system and method for treating malodors with low cost, good purification effect and low risk of secondary pollution.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: A system for treating bad odors, comprising an air intake pipe, a hypochlorous acid generating device, a spray reaction device, a synergist dosing device and a spray liquid circulation device; The air inlet of the air inlet pipe is in communication with the foul smelling gas; The hypochlorous acid generating device comprises a hypochlorous acid generator, and the hypochlorous acid generator is connected to a hypochlorous acid collecting box and a sodium hydroxide collecting box; The spray reaction device comprises a primary spray tower, a secondary spray tower and a tertiary synergistic reaction tower which are connected in sequence; the bottom of the primary spray tower is connected to a primary circulating water tank, and the water outlet of the primary circulating water tank is connected to the spray area of ​​the primary spray tower to form a circulating spray passage; the bottom of the secondary spray tower is connected to a secondary circulating water tank, and the water outlet of the secondary circulating water tank is connected to the spray area of ​​the secondary spray tower to form a circulating spray passage; the bottom of the tertiary synergistic reaction tower is connected to a tertiary circulating water tank, and the water outlet of the tertiary circulating water tank is connected to the spray area of ​​the tertiary synergistic reaction tower to form a circulating spray passage; The water outlet of the hypochlorous acid collection tank is connected to the primary circulating water tank and the secondary circulating water tank respectively through a first reversing valve; The water outlet of the sodium hydroxide collection tank is connected to the primary circulating water tank and the secondary circulating water tank respectively through a second reversing valve; The synergist dosing device includes a first medicine box, a second medicine box and a third medicine box; The spray liquid circulation device comprises a first waste liquid collection tank and a second waste liquid collection tank which are connected in sequence; The water outlet of the first medicine tank is connected to the primary circulating water tank and the secondary circulating water tank respectively through the third reversing valve; The water outlet of the second medicine tank is connected to the water inlet of the tertiary circulating water tank; The water outlet of the third medicine box is connected to the water inlet of the second waste liquid collection box; The water inlet of the first waste liquid collection tank is connected to the water outlet of the primary circulating water tank; a bypass pipe is also provided between the water inlet of the first waste liquid collection tank and the water outlet of the primary circulating water tank as an overflow pipe to prevent liquid in the primary circulating water tank from overflowing; The water inlet of the second waste liquid collection tank is connected to the water outlet of the secondary circulating water tank; The water outlet of the second waste liquid collection tank is connected to the water inlets of the primary circulating water tank and the secondary circulating water tank respectively through the fourth reversing valve.

[0007] As a further improvement of the above technical solution: a first dosing pump is provided on the pipeline between the first medicine box and the third reversing valve; the first medicine box stores medicine A; the medicine A is at least one of potassium hydrogen phthalate, citric acid, acetic acid, and sulfuric acid.

[0008] As a further improvement of the above technical solution: a second dosing pump is provided on the pipeline between the second medicine box and the tertiary circulating water tank; the second medicine box stores medicine B; the medicine B is at least one of ascorbic acid, sodium thiosulfate and calcium sulfite.

[0009] As a further improvement of the above technical solution: a third dosing pump is provided on the pipeline between the third medicine box and the second waste liquid collection box; the third medicine box stores medicine C; the medicine C is at least one of hydrogen peroxide and peroxymonosulfate.

[0010] As a further improvement of the above technical solution: a delivery pump is provided on the pipeline between the second waste liquid collection box and the fourth reversing valve.

[0011] As a further improvement of the above technical solution: it also includes an intelligent control device; the intelligent control device includes a detection module and a control module.

[0012] As a further improvement of the above technical solution: the detection module includes a first pH meter, a second pH meter, an ORP meter, an ammonia nitrogen online monitor, a residual chlorine monitor, a humidity monitor and a temperature monitor; the first pH meter is connected to the primary circulating water tank; the second pH meter is connected to the secondary circulating water tank; the ORP meter is connected to the secondary circulating water tank; the ammonia nitrogen online monitor is connected to the second waste liquid collection tank; the residual chlorine monitor is connected to the second waste liquid collection tank; the humidity monitor and the temperature monitor are connected to the air intake pipe.

[0013] As a further improvement of the above technical solution: the control module includes a CPU module, an analog module and a power module; the CPU module, the analog module and the power module are electrically connected; the CPU module is electrically connected to the hypochlorous acid generating device, the spray reaction device, the synergist dosing device and the spray liquid circulation device; the analog module is electrically connected to the detection module.

[0014] As a further improvement of the above technical solution: the hypochlorous acid generator is connected to a raw material storage tank; the raw material storage tank is also connected to a water storage tank; a filter is provided on the pipeline between the water storage tank and the raw material storage tank.

[0015] As a further improvement of the above technical solution: a hypochlorous acid dosing pump is provided on the pipeline between the hypochlorous acid collection box and the first reversing valve.

[0016] As a further improvement of the above technical solution: a sodium hydroxide dosing pump is provided on the pipeline between the sodium hydroxide collecting box and the second reversing valve.

[0017] As a further improvement of the above technical solution: a primary circulation pump is provided on the pipeline between the primary circulation water tank and the spraying area of ​​the primary spray tower.

[0018] As a further improvement of the above technical solution: a secondary circulation pump is provided on the pipeline between the secondary circulation water tank and the spraying area of ​​the secondary spray tower.

[0019] As a further improvement of the above technical solution: a three-stage circulation pump is provided on the pipeline between the three-stage circulation water tank and the spraying area of ​​the three-stage synergistic reaction tower.

[0020] As a further improvement of the above technical solution: the air outlet of the air inlet pipe is connected to the bottom of the first-stage spray tower; the air outlet of the first-stage spray tower is located at the top of the tower; the air outlet of the first-stage spray tower is connected to the bottom of the second-stage spray tower; the air outlet of the second-stage spray tower is located at the top of the tower; the air outlet of the second-stage spray tower is connected to the bottom of the third-stage synergistic reaction tower.

[0021] As a further improvement of the above technical solution: the second-level spray tower includes a spray reaction zone and a demisting zone from bottom to top.

[0022] As a further improvement of the above technical solution: the three-stage synergistic reaction tower includes a liquid storage tank, a guide assembly, a filler assembly and a spray assembly from bottom to top; the bottom of the three-stage synergistic reaction tower is also provided with an air intake branch pipe, the outlet of the air intake branch pipe faces upward and is located above the liquid level in the liquid storage tank; the outlet of the air intake branch pipe is located below the guide assembly, and the vertical projection area of ​​the guide assembly is larger than the outlet area of ​​the air intake branch pipe.

[0023] As a further improvement of the above technical solution: the guide component is composed of an upper liquid guide component and a lower gas guide component; the upper liquid guide component and the lower gas guide component are both solid frustum-like components with curved slopes; the upper top of the upper liquid guide component is provided with a plurality of overflow grooves; the bottom of the three-stage synergistic reaction tower is provided with at least three support frames; the lower gas guide component is installed on the support frame so that the lower gas guide component is installed above the liquid storage tank; the lowest point below the lower gas guide component is above the outlet of the air inlet branch pipe.

[0024] As a further improvement of the above technical solution: the packing assembly includes a bearing element and a packing, the outer periphery of the bearing element is connected to the inner wall of the three-stage synergistic reaction tower; the bearing element is formed by stacking multiple layers of coaxial hollow cones; adjacent coaxial hollow cones are symmetrically arranged; the coaxial hollow cones are formed by coaxially connecting multiple conical hollow cone rings of different diameters, and two adjacent conical hollow cone rings are staggered and overlapped in the form of upright and inverted, and a V-shaped groove is formed between two adjacent conical hollow cone rings; the opening angle of the V-shaped groove is 5° to 180°; a plurality of holes are opened on the inner wall of the V-shaped groove; the V-shaped groove is filled with the packing; the packing is at least one of regular packing and bulk packing; a fixed support structure is provided between two adjacent conical hollow cone rings; the central groove of the lowest coaxial hollow cone in the bearing element is embedded in the top of the upper liquid guide component.

[0025] As a further improvement of the above technical solution: the spray assembly includes a spray distribution pipe, and a plurality of spray heads are distributed on the spray distribution pipe; the water inlet of the spray distribution pipe is connected to the water outlet of the tertiary circulating water tank.

[0026] As a general technical concept, the present invention also provides a method for treating malodor, using the above-mentioned system for treating malodor to treat malodor.

[0027] As a further improvement of the above technical solution: when the system is used to treat malodor, the following steps are included: S1. Start the hypochlorous acid generator to produce sodium hydroxide and hypochlorous acid, and transport them to the primary circulating water tank and the secondary circulating water tank respectively according to the process requirements to obtain sodium hydroxide solution and hypochlorous acid solution; S2, transporting the malodorous gas from the air inlet pipe to the primary spray tower and the secondary spray tower in sequence, turning on the primary circulation pump and the secondary circulation pump, and performing primary oxidation degradation treatment on the malodorous gas using sodium hydroxide solution and hypochlorous acid solution; S3, transporting the waste gas treated by the secondary spray tower to the tertiary synergistic reaction tower for secondary oxidation degradation treatment, thereby completing the deep purification of the malodor.

[0028] As a further improvement of the above technical solution: in step S1, the pH value of the sodium hydroxide solution in the primary circulating water tank is controlled to be 9.5-12; the increase in the effective chlorine concentration in the secondary circulating water tank is controlled to be 5 mg·L -1 ·h -1 ~80 mg·L -1 ·h -1 .

[0029] As a further improvement of the above technical solution: in step S2, the first dosing pump is turned on to add agent A to the primary circulating water tank or the secondary circulating water tank; during the primary oxidation degradation treatment, when the spraying time of the hypochlorous acid solution reaches 4h to 12h, the waste liquid in the secondary circulating water tank and the first waste liquid collection tank is discharged into the second waste liquid collection tank according to the discharge volume of the waste liquid being 10% to 50% of the total volume of the waste liquid in the secondary circulating water tank, the third dosing pump is turned on to transport agent C to the second waste liquid collection tank until the concentration of agent C in the second waste liquid collection tank is 0.2 g / L to 1.0 g / L, the waste liquid in the second waste liquid collection tank is treated with agent C until the ammonia nitrogen concentration in the second waste liquid collection tank is less than 1 mg / L, and the third dosing pump is continued to be turned on to make the concentration of agent C in the second waste liquid collection tank 0.4 g / L to 2.4 g / L, the reagent C is used to react with the chloride ions in the second waste liquid collection tank to produce effective chlorine, until the effective chlorine content of the waste liquid in the second waste liquid collection tank reaches 40mg / L~200mg / L, the hypochlorous acid generator is turned off, the delivery of hypochlorous acid to the secondary circulating water tank is stopped, and the delivery pump is turned on to deliver the waste liquid in the second waste liquid collection tank to the primary circulating water tank or the secondary circulating water tank, until the waste liquid in the second waste liquid collection tank treats the malodorous gas for 6h~12h, the waste liquid in the second waste liquid collection tank is discharged to the outside, and the hypochlorous acid generator continues to produce hypochlorous acid and uses the hypochlorous acid solution to continue to treat the malodorous gas; the excess waste liquid in the second waste liquid collection tank is discharged to the outside.

[0030] As a further improvement of the above technical solution: in step S3, the second dosing pump is turned on to deliver agent B to the tertiary circulating water tank; when the humidity of the odorous gas in the air intake pipe is less than 90% and the temperature is greater than 65°C, the first dosing pump, the second dosing pump, and the third dosing pump are turned off; when the humidity of the odorous gas in the air intake pipe is greater than 95% and the temperature is less than 65°C, the first dosing pump, the second dosing pump, and the third dosing pump are turned on.

[0031] Compared with the prior art, the advantages of the present invention are: (1) In the system for treating malodor of the present invention, the hypochlorous acid generating device can obtain sodium hydroxide and hypochlorous acid at the same time, which is conducive to simplifying the complexity of the equipment and reducing the treatment cost. At the same time, after the sodium hydroxide and hypochlorous acid are transported to the primary circulating water tank and the secondary circulating water tank, they can be configured into sodium hydroxide solution, sodium hypochlorite solution and hypochlorous acid solution. On this basis, the sodium hydroxide solution, sodium hypochlorite solution and hypochlorous acid solution are transported to the primary spray tower and the secondary spray tower, and the malodorous gas is continuously sprayed in the primary spray tower and the secondary spray tower. On the one hand, the sodium hydroxide solution can be used to remove acidic malodorous gases (such as H2S, S O2), and sodium hypochlorite solution and hypochlorous acid solution can be used to oxidize and degrade volatile fatty acids, alcohols, benzene, phenols and some greenhouse gases that are difficult to degrade and have bad odors. Therefore, under the joint action of the first-level spray tower and the second-level spray tower, effective purification of various odorous gases can be achieved. More importantly, after the waste gas treated by the second-level spray tower is passed into the third-level synergistic reaction tower, it can further achieve oxidative degradation of the residual odorous gases. Therefore, under the joint action of the first-level spray tower, the second-level spray tower and the third-level synergistic reaction tower, the effective control of odorous gases with complex components within a larger temperature and humidity range can be significantly improved. In addition, in the present invention, by setting the first reversing valve and the second reversing valve, the spraying mode can be adjusted in time according to the different properties of the odorous gases, thereby ensuring the effective control of odorous gases of different properties, and better adaptability. The system for treating malodors and odors of the present invention has the advantages of low cost, good purification effect, and low risk of secondary pollution. It is suitable for purifying different types of malodorous gases, plays an important role in effectively improving the environment around paper mills, has high use value, and good application prospects.

[0032] (2) The system for treating malodor of the present invention also includes: a synergist dosing device and a spray liquid circulation device; wherein, by introducing different agents in different agent boxes into the primary circulation water tank, the secondary circulation water tank and the tertiary circulation water tank, the treatment effect of malodor can be enhanced with the auxiliary effect of the agents, and the discharge of malodor can be effectively avoided; by setting up a spray liquid circulation device, not only can the recycling of various agents be realized, and the reuse efficiency of each effective component in the waste liquid be enhanced, while reducing the amount of agent used, the treatment cost can also be reduced, and the discharge of waste liquid can be reduced, which is conducive to reducing the difficulty and amount of waste liquid treatment. It can be seen that under the joint action of the hypochlorous acid generating device, the spray reaction device, the synergist dosing device and the spray liquid circulation device, not only can the malodor be effectively removed, but also the recycling effect of each agent can be effectively improved, and at the same time, the difficulty and amount of treatment of the leaching waste liquid can be reduced.

[0033] (3) The system for treating malodor of the present invention also includes: an intelligent control device. On the one hand, the detection module can be used to obtain relevant original data in a timely manner. On the other hand, the process parameters of each device in the system can be adjusted in a timely manner through the processing of the control module, so that the malodor can be removed in a timely and efficient manner, and the operating cost of the entire system can be reduced.

[0034] (4) In the system for treating malodors and unpleasant odors of the present invention, the three-stage synergistic reaction tower includes a liquid storage tank, a flow guide assembly, a filler assembly and a spray assembly from bottom to top. The exhaust gas entering from the bottom of the three-stage synergistic reaction tower is converted from axial flow to radial flow in the three-stage synergistic reaction tower by the flow guide assembly, so that the exhaust gas can be more evenly dispersed in the three-stage synergistic reaction tower. After entering the filler assembly, the exhaust gas will react with the spray liquid from the spray assembly, thereby being able to more thoroughly remove the malodors and unpleasant odors and ensure that the exhaust gas can meet the emission standards.

[0035] (5) The method for treating malodor of the present invention adopts the above-mentioned treatment system to treat malodor, which can effectively remove various malodors in waste gas, with less dosage of reagents and less waste liquid output. It has the advantages of simple process, convenient operation, low cost, high treatment efficiency and good removal effect, and can be widely used to purify malodors from paper mills. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0037] Figure 1 This is a schematic diagram of the structure of the system for treating malodor in Example 1 of the present invention.

[0038] Figure 2 This is a schematic diagram of the structure of the three-stage synergistic reaction tower in Example 1 of the present invention.

[0039] Figure 3 It is a schematic diagram of the local structure of the three-stage synergistic reaction tower in Example 1 of the present invention.

[0040] Figure 4 It is a schematic diagram of the top structure of the support element in Example 1 of the present invention.

[0041] Figure 5 for Figure 4 Cross-sectional view at AA in the middle.

[0042] Figure 6 Schematic diagram of the structure of the upper liquid guide assembly in Example 1 of the present invention.

[0043] Figure 7This is a diagram showing the corresponding purification effect when the treatment system is used to treat malodorous gas in Example 1-2 of the present invention.

[0044] Legend: 1. Air intake pipe; 21. Filter; 22. Raw material storage tank; 23. Hypochlorous acid generator; 24. Hypochlorous acid collection tank; 241. Hypochlorous acid dosing pump; 25. Sodium hydroxide collection tank; 251. Sodium hydroxide dosing pump; 31. Primary spray tower; 311. Primary circulation pump; 312. Primary circulation water tank; 32. Secondary spray tower; 321. Secondary circulation pump; 322. Secondary circulation water tank; 323. Demisting area; 324. Spray reaction area; 33. Third-stage synergistic reaction tower; 331. Third-stage circulation pump; 332. Third-stage circulation water tank; 333. Liquid storage tank; 334. Diversion assembly; 3341. Upper liquid diversion assembly; 33411, overflow trough; 3342, lower gas guide assembly; 3343, support frame; 335, filler assembly; 3351, bearing element; 3352, filler; 3353, hole; 3354, fixed support structure; 336, spray assembly; 3361, spray distribution pipe; 3362, spray head; 41, first medicine box; 411, first dosing pump; 42, second medicine box; 421, second dosing pump; 43, third medicine box; 431, third dosing pump; 51, delivery pump; 52, first waste liquid collection box; 53, second waste liquid collection box; 54, first reversing valve; 55. Second reversing valve; 56. Third reversing valve; 57. Fourth reversing valve; 611. First pH meter; 612. Second pH meter; 613. ORP meter; 614. Ammonia nitrogen online monitor; 615. Residual chlorine monitor; 616. Humidity monitor; 617. Temperature monitor. DETAILED DESCRIPTION

[0045] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] In the description of the present invention, it should be noted that the terms "center", "up", "down", "front", "back", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0047] Example 1 like Figure 1 As shown, the system for treating malodor in this embodiment includes an air inlet pipe 1, a hypochlorous acid generating device and a spray reaction device, wherein the air inlet of the air inlet pipe 1 is connected to the malodorous gas; the hypochlorous acid generating device includes a hypochlorous acid generator 23, and the hypochlorous acid collecting box 24 and the sodium hydroxide collecting box 25 are connected to the hypochlorous acid generator 23; the spray reaction device includes a primary spray tower 31, a secondary spray tower 32 and a tertiary synergistic reaction tower 33 connected in sequence; the bottom of the primary spray tower 31 is connected to a primary circulating water tank 312, and the water outlet of the primary circulating water tank 312 is connected to the spraying area of ​​the primary spray tower 31 to form a circulating spray passage; the secondary spray The bottom of the shower tower 32 is connected to a secondary circulating water tank 322, and the water outlet of the secondary circulating water tank 322 is connected to the spraying area of ​​the secondary spray tower 32 to form a circulating spray passage; the bottom of the tertiary synergistic reaction tower 33 is connected to a tertiary circulating water tank 332, and the water outlet of the tertiary circulating water tank 332 is connected to the spraying area of ​​the tertiary synergistic reaction tower 33 to form a circulating spray passage; the water outlet of the hypochlorous acid collection tank 24 is connected to the primary circulating water tank 312 and the secondary circulating water tank 322 respectively through the first reversing valve 54; the water outlet of the sodium hydroxide collection tank 25 is connected to the primary circulating water tank 312 and the secondary circulating water tank 322 respectively through the second reversing valve 55.

[0048] In this embodiment, the collected foul-smelling gases are transported to the first-stage spray tower 31, the second-stage spray tower 32 and the third-stage synergistic reaction tower 33 in sequence through the air intake pipe 1, and after being jointly treated by the first-stage spray tower 31, the second-stage spray tower 32 and the third-stage synergistic reaction tower 33, they are discharged outward from the third-stage synergistic reaction tower 33 in compliance with the standards. During the spraying process, in the hypochlorous acid generator 23, water and sodium chloride are used as raw materials to generate hypochlorous acid solution and sodium hydroxide solution, wherein the method for producing hypochlorous acid solution includes electrolysis, chemical synthesis, etc. Further, the generated hypochlorous acid solution and sodium hydroxide solution are respectively transported to the hypochlorous acid collection box 24 and the sodium hydroxide collection box 25. When in use, the hypochlorous acid dosing pump 241 is used to transport the hypochlorous acid solution in the hypochlorous acid collection box 24 to the primary circulating water tank 312 or the secondary circulating water tank 322 as needed through the regulation of the first reversing valve 54, and the sodium hydroxide dosing pump 251 is used to transport the sodium hydroxide solution in the sodium hydroxide collection box 25 to the primary circulating water tank 312 or the secondary circulating water tank 322 as needed through the regulation of the second reversing valve 55. Therefore, according to different odorous gas conditions, one or more combinations of sodium hydroxide solution, sodium hypochlorite solution, hypochlorous acid solution, etc. can be used for circulating spraying, so that the odor can be effectively removed.

[0049] like Figure 1As shown, in this embodiment, it also includes: a synergist dosing device and a spray liquid circulation device; the synergist dosing device includes a first medicine box 41, a second medicine box 42 and a third medicine box 43; the spray liquid circulation device includes a first waste liquid collection box 52 and a second waste liquid collection box 53 that are connected in sequence; the water outlet of the first medicine box 41 is connected to the primary circulation water tank 312 and the secondary circulation water tank 322 respectively through the third reversing valve 56; the water outlet of the second medicine box 42 is connected to the water inlet of the tertiary circulation water tank 332; the third medicine box The water outlet of the agent box 43 is connected to the water inlet of the second waste liquid collection box 53; the water inlet of the first waste liquid collection box 52 is connected to the water outlet of the primary circulating water tank 312; a bypass pipe is also provided between the water inlet of the first waste liquid collection box 52 and the water outlet of the primary circulating water tank 312; the water inlet of the second waste liquid collection box 53 is connected to the water outlet of the secondary circulating water tank 322; the water outlet of the second waste liquid collection box 53 is connected to the water inlets of the primary circulating water tank 312 and the secondary circulating water tank 322 respectively through the fourth reversing valve 57.

[0050] like Figure 1 As shown, in this embodiment, a first dosing pump 411 is provided on the pipeline between the first medicine box 41 and the third reversing valve 56; the first medicine box 41 stores medicine A, wherein medicine A is at least one of potassium hydrogen phthalate, citric acid, acetic acid, and sulfuric acid, for example, medicine A is potassium hydrogen phthalate, or citric acid, or acetic acid, or sulfuric acid. In this embodiment, medicine A is potassium hydrogen phthalate.

[0051] like Figure 1 As shown, in this embodiment, the first reagent tank 41 is connected to the primary circulating water tank 312 and the secondary circulating water tank 322 through a pipeline, so that under the action of the first dosing pump 411, the reagent A can be selectively added to the primary circulating water tank 312 and the secondary circulating water tank 322 through the third reversing valve 56. At the same time, under the action of the reagent A, it can be combined with sodium hydroxide, sodium hypochlorite and hypochlorous acid to jointly improve the odor removal effect of the primary spray tower 31 and the secondary spray tower 32.

[0052] like Figure 1 As shown, in this embodiment, a second dosing pump 421 is provided on the pipeline between the second medicine box 42 and the tertiary circulating water tank 332, and the second medicine box 42 stores medicine B, wherein medicine B is at least one of ascorbic acid, sodium thiosulfate, and calcium sulfite, for example, medicine B is ascorbic acid or sodium thiosulfate. In this embodiment, medicine B is calcium sulfite.

[0053] In this embodiment, the second medicine box 42 is connected to the tertiary circulating water tank 332 through a pipeline, so that the medicine B can be added to the tertiary circulating water tank 332 under the action of the second dosing pump 421. At the same time, under the action of the medicine B, the odor removal effect of the tertiary synergistic reaction tower 33 can be effectively improved, especially, the odorous gas volatilized after the spraying reaction can be effectively removed.

[0054] like Figure 1 As shown, in this embodiment, a third dosing pump 431 is provided on the pipeline between the third reagent box 43 and the second waste liquid collection box 53; the third reagent box 43 stores reagent C, wherein the reagent C is at least one of hydrogen peroxide and peroxymonosulfate, for example, the reagent C is hydrogen peroxide or peroxymonosulfate. In this embodiment, the reagent C is peroxymonosulfate (PMS).

[0055] In this embodiment, a delivery pump 51 is provided on the pipeline between the second waste liquid collection box 53 and the fourth reversing valve 57 .

[0056] In this embodiment, the third reagent box 43 is connected to the second waste liquid collection box 53 through a pipeline, and the reagent C can be transported to the second waste liquid collection box 53 under the action of the third dosing pump 431 to degrade the ammonia nitrogen in the waste liquid. Furthermore, the waste liquid in the second waste liquid collection box 53 treated with the reagent C can be selectively transported to the primary circulation water tank 312 and the secondary circulation water tank 322 through the delivery pump 51 and under the action of the fourth reversing valve 57. In this way, the waste liquid can continue to be used to wash away the foul odor. While maximizing the utilization rate of the waste liquid, it can also minimize the discharge of the waste liquid, which is beneficial to reducing the difficulty and amount of subsequent treatment of the waste liquid, and can effectively reduce secondary pollution.

[0057] In this embodiment, the primary circulating water tank 312 is connected to the first waste liquid collection tank 52 through a pipeline, and a bypass pipe is provided, so that the waste liquid of the primary circulating water tank 312 can be stored in the first waste liquid collection tank 52. At the same time, the first waste liquid collection tank 52 is connected to the second waste liquid collection tank 53 through a pipeline, so that the waste liquid (sodium hydroxide solution or hypochlorous acid solution) in the first waste liquid collection tank 52 can be used to adjust the water quality of the waste liquid in the second waste liquid collection tank 53. On the one hand, the use cycle of the waste liquid can be extended, and on the other hand, the difficulty of treating the waste liquid can be reduced.

[0058] like Figure 1 As shown, in this embodiment, it also includes: an intelligent control device; the intelligent control device includes a detection module and a control module.

[0059] In this embodiment, the detection module includes a first pH meter 611, a second pH meter 612, an ORP meter 613, an ammonia nitrogen online monitor 614, a residual chlorine monitor 615, a humidity monitor 616 and a temperature monitor 617; the first pH meter 611 is connected to the primary circulating water tank 312 to monitor the pH value of the spray liquid in the primary spray tower 31; the second pH meter 612 is connected to the secondary circulating water tank 322 to detect the pH value of the spray liquid in the secondary spray tower 32; the ORP meter 613 is connected to the The secondary circulating water tank 322 is used to monitor the ORP value of the spray liquid in the secondary spray tower 32; the ammonia nitrogen online monitor 614 is connected to the second waste liquid collection box 53 to monitor the ammonia nitrogen concentration of the waste liquid in the second waste liquid collection box 53; the residual chlorine monitor 615 is connected to the second waste liquid collection box 53 to monitor the residual chlorine content of the waste liquid in the second waste liquid collection box 53; the humidity monitor 616 and the temperature monitor 617 are connected to the air intake pipe 1 to monitor the humidity and temperature of the foul smelling gas. A current transformer is also installed on the dryer drive motor of the papermaking drying section to monitor the working status of the dryer drive motor.

[0060] In this embodiment, the control module includes a CPU module, an analog module and a power module; the CPU module, the analog module and the power module are electrically connected; the CPU module is electrically connected to the hypochlorous acid generating device, the spray reaction device, the synergist dosing device and the spray liquid circulation device; the analog module is electrically connected to the detection module.

[0061] In this embodiment, the preset rules and model algorithm of the control module are to judge the current production status of the paper machine by entering the exhaust gas humidity state, temperature state and working state of the drying cylinder drive motor, judge the content of hypochlorous acid in the secondary circulation water tank 322 by the ORP value of the spray liquid, judge the amount of sodium hydroxide added in the primary circulation water tank 312 by the pH value of the spray liquid, judge whether to turn on the third dosing pump 431 by the ammonia nitrogen concentration of the waste liquid in the second waste liquid collection tank 53, judge whether to turn off the hypochlorous acid dosing pump 241 according to the residual chlorine concentration of the waste liquid in the second waste liquid collection tank 53, and send the operating parameter adjustment instruction to the hypochlorous acid generating device, the spray liquid circulation device and the synergist dosing device.

[0062] In this embodiment, the intelligent control device is mainly a control device such as a PLC device or a DCS device. By detecting the operating status of the paper machine equipment and the operating parameters of each device through the detection module, the operating conditions of the synergist dosing device, the spray liquid circulation device and the hypochlorous acid generating device can be intelligently regulated, which can not only adjust the purification process parameters in time, but also reduce the operating cost of the entire device.

[0063] like Figure 1As shown, in this embodiment, the hypochlorous acid generator 23 is connected to a raw material storage tank 22, and the raw material storage tank 22 is also connected to a water storage tank (i.e., plant water supply); a filter 21 is provided on the pipeline between the water storage tank and the raw material storage tank 22.

[0064] like Figure 1 As shown, in this embodiment, a hypochlorous acid dosing pump 241 is provided on the pipeline between the hypochlorous acid collection tank 24 and the first reversing valve 54, and the hypochlorous acid dosing pump 241 delivers the hypochlorous acid solution to the primary circulating water tank 312 or the secondary circulating water tank 322.

[0065] like Figure 1 As shown, in this embodiment, a sodium hydroxide dosing pump 251 is provided on the pipeline between the sodium hydroxide collection box 25 and the second reversing valve 55, and the sodium hydroxide dosing pump 251 delivers sodium hydroxide solution to the primary circulating water tank 312 or the secondary circulating water tank 322.

[0066] like Figure 1 As shown, in this embodiment, a primary circulation pump 311 is provided on the pipeline between the primary circulation water tank 312 and the spraying area of ​​the primary spray tower 31. Under the action of the primary circulation pump 311, cyclic spraying of foul odors can be achieved to improve the purification effect.

[0067] like Figure 1 As shown, in this embodiment, a secondary circulation pump 321 is provided on the pipeline between the secondary circulation water tank 322 and the spraying area of ​​the secondary spray tower 32. Under the action of the secondary circulation pump 321, cyclic spraying of foul odors can be achieved, thereby improving the purification effect.

[0068] like Figure 1 As shown, in this embodiment, a third-stage circulation pump 331 is provided on the pipeline between the third-stage circulation water tank 332 and the spraying area of ​​the third-stage synergistic reaction tower 33. Under the action of the third-stage circulation pump 331, cyclic spraying of foul odors can be achieved to improve the purification effect.

[0069] like Figure 1 As shown, in this embodiment, the air outlet of the air inlet pipe 1 is connected to the bottom of the first-stage spray tower 31, the air outlet of the first-stage spray tower 31 is located at the top of the tower, the air outlet of the first-stage spray tower 31 is connected to the bottom of the second-stage spray tower 32, the air outlet of the second-stage spray tower 32 is located at the top of the tower, and the air outlet of the second-stage spray tower 32 is connected to the bottom of the third-stage synergistic reaction tower 33. At the same time, in this embodiment, the third-stage synergistic reaction tower 33 is located at the top of the second-stage spray tower 32, which is conducive to saving the floor space of the equipment. In other embodiments, the air outlet of the second-stage spray tower 32 can also be connected to the air inlet of the third-stage synergistic reaction tower 33 through a pipeline.

[0070] like Figure 1As shown, in this embodiment, the second-stage spray tower 32 includes a spray reaction zone 324 and a demisting zone 323 from bottom to top. After the waste gas is treated by the spray reaction zone 324 and the demisting zone 323, the odor content is significantly reduced, and the humidity is also significantly reduced, which is convenient for subsequent oxidative degradation treatment.

[0071] like Figure 1 As shown, in this embodiment, the three-stage synergistic reaction tower 33 includes a liquid storage tank 333, a guide component 334, a filler component 335 and a spray component 336 from bottom to top. An air intake branch pipe is also provided at the bottom of the three-stage synergistic reaction tower 33, and the other end of the air intake branch pipe is connected to the air outlet of the secondary spray tower 32. At the same time, the outlet of the air intake branch pipe faces upward and is located above the liquid level in the liquid storage tank 333; the outlet of the air intake branch pipe is located below the guide component 334, and the vertical projection area of ​​the guide component 334 is larger than the outlet area of ​​the air intake branch pipe. On the one hand, it can prevent the spray liquid from entering the secondary spray tower 32 through the air intake branch pipe, and on the other hand, it is also convenient for the exhaust gas to be transported upward.

[0072] like Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 6 As shown, in this embodiment, the guide component 334 is composed of an upper liquid guide component 3341 and a lower gas guide component 3342; the upper liquid guide component 3341 and the lower gas guide component 3342 are both solid truncated cones with curved slopes; the upper top of the upper liquid guide component 3341 is provided with a plurality of overflow grooves 33411 to prevent the accumulation of spray liquid, and at the same time, the upper spray liquid can effectively flow into the box body storage tank along the upper liquid guide component 3341; at least three support frames 3343 are provided at the bottom of the three-stage synergistic reaction tower 33; the lower gas guide component 3342 is installed on the support frame 3343, so that the lower gas guide component 3342 is installed above the storage tank 333; the lowest point below the lower gas guide component 3342 is above the outlet of the air inlet branch pipe, thereby enabling the flow direction of the exhaust gas in the three-stage synergistic reaction tower 33 to change from axial flow to radial flow, which is beneficial to increase the probability of gas-liquid contact.

[0073] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5As shown, in this embodiment, the filler assembly 335 includes a bearing element 3351 and a filler 3352, the outer periphery of the bearing element 3351 is connected to the inner wall of the three-stage synergistic reaction tower 33; the bearing element 3351 is formed by stacking multiple layers of coaxial hollow cones, for example, by stacking two layers of coaxial hollow cones; adjacent coaxial hollow cones are symmetrically arranged; the coaxial hollow cones are formed by coaxially connecting multiple conical hollow cone rings of different diameters, and two adjacent conical hollow cone rings are staggered and overlapped in the form of upright and inverted, and a V-shaped groove is formed between the two adjacent conical hollow cone rings; the opening of the V-shaped groove The opening angle is 5° to 180°. In the present embodiment, the opening angle of the V-shaped groove is 30°. A plurality of holes 3353 are provided on the inner wall of the V-shaped groove to facilitate the upward transportation of exhaust gas. The V-shaped groove is filled with a filler 3352, and the filler 3352 is at least one of a regular filler and a bulk filler. In the present embodiment, the filler 3352 is a bulk filler. A fixed support structure 3354 is provided between two adjacent conical hollow cone rings to increase the strength of the supporting element 3351. The central groove of the lowest coaxial hollow cone in the supporting element 3351 is nested with the upper liquid guide component 3341.

[0074] like Figure 2 As shown, in this embodiment, the spray assembly 336 includes a spray distribution pipe 3361, on which a plurality of spray heads 3362 are distributed, and the water inlet of the spray distribution pipe 3361 is connected to the water outlet of the tertiary circulation water tank 332.

[0075] A method for treating malodor using the system of this embodiment comprises the following steps: S1. Start the hypochlorous acid generator to produce sodium hydroxide and hypochlorous acid, and transport them to the primary circulating water tank and the secondary circulating water tank, respectively, to obtain sodium hydroxide solution and hypochlorous acid solution, as follows: In this embodiment, the primary circulating water tank 312 includes a water tank body and a first pH meter 611. The water tank body is used to store and discharge the spray circulating liquid. The water inlet of the primary circulating water tank 312 is connected to the sodium hydroxide collection tank 25 through a pipeline, and the water outlet of the primary circulating water tank 312 is connected to the first waste liquid collection tank 52 through a pipeline. The first pH meter 611 is used to monitor and control the spray circulating liquid. Specifically, the pH of the spray circulating liquid is monitored online to be maintained at 9.5-12. When it is lower than the lower limit of the range, the liquid is discharged from the sodium hydroxide collection tank 25, and part of the waste liquid is discharged into the first waste liquid collection tank 52. When the upper limit of the range is reached, the liquid is stopped from being discharged from the sodium hydroxide collection tank 25.

[0076] In this embodiment, the secondary circulating water tank 322 includes a water tank body, an ORP meter 613, and a second pH meter 612. The water tank body is used to store and discharge the spray circulating liquid. The spray circulating liquid uses hypochlorous acid solution and waste liquid treatment liquid alternately. The water inlet of the secondary circulating water tank 322 is connected to the outlet of the hypochlorous acid collection tank 24, the outlet of the second waste liquid collection tank 53, and the outlet of the first dosing device 41 (agent A) through pipelines, and the outlet of the secondary circulating water tank 322 is connected to the inlet of the second waste liquid collection tank 53 through pipelines. The second pH meter 612 is used to monitor and control the pH value of the circulating liquid, and the ORP meter 613 is used to monitor and control the oxidation-reduction potential of the effective chlorine content of the solution, so that the increase in the hypochlorous acid concentration from the original solution in the hypochlorous acid collection tank 24 to the secondary circulating water tank 322 per hour is 40 mg / (L·h).

[0077] S2, transport the malodorous gas from the air inlet pipe 1 to the primary spray tower 31 and the secondary spray tower 32 in sequence, start the primary circulation pump 311 and the secondary circulation pump 321, and use sodium hydroxide solution and hypochlorous acid solution to perform primary oxidation degradation treatment on the malodorous gas, specifically: The first dosing pump 411 is turned on to add agent A to the secondary circulating water tank 322 to enhance the pH of the circulating liquid and extend the treatment time for odor. During the primary oxidation and degradation treatment, when the spraying time of the hypochlorous acid solution reaches 8 hours, the waste liquid in the secondary circulating water tank 322 and the first waste liquid collection tank 52 is discharged into the second waste liquid collection tank 53 according to the discharge volume of the waste liquid being 50% of the total volume of the waste liquid in the secondary circulating water tank 322. The third dosing pump 431 is turned on to transport agent C to the second waste liquid collection tank 53 until the concentration of agent C in the second waste liquid collection tank 53 is 0.2 g / L to 1.0 g / L. The waste liquid in the second waste liquid collection tank 53 is treated with agent C for 2 hours until the ammonia nitrogen concentration in the second waste liquid collection tank 53 is less than 1 mg / L. The third dosing pump 431 is continued to be turned on to make the concentration of agent C in the second waste liquid collection tank 53 0.4 g / L to 2.4 g / L, and use the reagent C to react with the chloride ions in the second waste liquid collection tank 53 to produce effective chlorine, until the effective chlorine content of the waste liquid in the second waste liquid collection tank 53 reaches 40 mg / L~200 mg / L, then turn off the hypochlorous acid generator 23, stop delivering hypochlorous acid to the secondary circulating water tank 322, and start the delivery pump 51 to deliver the waste liquid in the second waste liquid collection tank 53 to the secondary circulating water tank 322, until the waste liquid in the second waste liquid collection tank 53 treats the malodorous gas for 8 hours, then the waste liquid in the second waste liquid collection tank 53 is discharged to the outside, and at the same time, the hypochlorous acid generator 23 continues to produce hypochlorous acid and uses the hypochlorous acid solution to continue to treat the malodorous gas; the excess waste liquid in the second waste liquid collection tank 53 is discharged to the outside.

[0078] S3, the waste gas treated by the secondary spray tower 32 is transported to the tertiary synergistic reaction tower 33 for secondary oxidation degradation treatment to complete the purification of the odor.

[0079] In step S3, the second dosing pump 421 is turned on to deliver agent B to the tertiary circulating water tank 332; when the humidity of the malodorous gas in the air intake pipe 1 is less than 90% and the temperature is greater than 65°C, the first dosing pump 411, the second dosing pump 421, and the third dosing pump 431 are turned off; when the humidity of the malodorous gas in the air intake pipe 1 is greater than 95% and the temperature is less than 65°C, the first dosing pump 411, the second dosing pump 421, and the third dosing pump 431 are turned on.

[0080] In this embodiment, the collected malodor is the malodorous gas discharged from the tail end of the papermaking process of the paper mill, and its parameters are: air volume is 20000 m³ / h, temperature is 57-60 ° C, main components and concentrations are: ammonia 1.5-2.5 ppm, hydrogen sulfide 0.35-0.5 ppm, trimethylamine 4.5-10 ppm, methyl mercaptan 0.5-2.0 ppm, methyl sulfide 1.5-2.0 ppm, dimethyl disulfide 0.5-1.5 ppm, carbon disulfide 0.7-1.8 ppm, styrene 7-13 ppm, odor concentration 500-600 (dimensionless).

[0081] The steps for treating malodor using the above system are as follows: (1) The malodorous gas is transported into the first-stage spray tower through the air inlet pipe and sprayed with pH=10-11 sodium hydroxide solution.

[0082] (2) The malodorous gas treated in the first-stage spray tower is transported to the second-stage spray tower through a pipeline. A mixture of 0.5 g / L potassium hydrogen phthalate (agent A), hypochlorous acid solution (200 ppm, pH=4.0) and waste liquid treated with PMS (agent C) is used as the spray liquid, and the circulating liquid is sprayed alternately.

[0083] (3) The gas treated in the secondary spray tower is directly passed into the tertiary synergistic reaction tower, where 0.5 g / L calcium sulfite solution is used as the spray liquid for spray treatment, and the treated air is finally discharged from the tail end.

[0084] Comparative Example 1: The secondary spray tower spray liquid used was a 200 ppm, pH = 4.0 hypochlorous acid solution, replacing the 0.5 g / L potassium hydrogen phthalate (agent A), hypochlorous acid solution (200 ppm, pH = 4.0) and the mixture of waste liquid treated with PMS (agent C) used in Example 1. Other conditions were the same as in Example 1.

[0085] Comparative Example 2: The secondary spray tower spray liquid used is a mixture of 0.5 g / L potassium hydrogen phthalate (agent A) and 200 ppm, pH = 4.0 hypochlorous acid solution, instead of the mixture of 0.5 g / L potassium hydrogen phthalate (agent A), hypochlorous acid solution (200 ppm, pH = 4.0) and waste liquid treated with PMS (agent C) used in Example 1. Other conditions are the same as in Example 1.

[0086] Comparative Example 3: The spray liquid of the three-stage synergistic reaction tower is industrial water, which is used to replace the 0.5 g / L calcium sulfite solution used in Example 1. Other conditions are the same as in Example 1.

[0087] Comparative Example 4: The secondary spray tower spray liquid used is dilute sulfuric acid with a pH of 4.0-5.0, replacing the mixture of 0.5 g / L potassium hydrogen phthalate (agent A), hypochlorous acid solution (200 ppm, pH = 4.0) and waste liquid treated with PMS (agent C) used in Example 1. Other conditions are the same as in Example 1.

[0088] Embodiment 2: Based on the basic situation of Example 1, the first reversing valve, the second reversing valve, the third reversing valve, and the fourth reversing valve are adjusted so that the hypochlorous acid solution is discharged from the hypochlorous acid collection tank into the primary circulating water tank; the sodium hydroxide solution is discharged into the secondary circulating water tank; the reagent A is discharged into the primary circulating water tank; the waste liquid in the second waste liquid collection tank is connected to the primary circulating water tank through a pipeline, so as to facilitate the discharge of the waste liquid treatment liquid into the primary circulating water tank; the reversing valve is adjusted, that is, the primary spray tower uses hypochlorous acid solution and waste liquid treatment liquid as spray liquid for alternating circulation, and the secondary spray tower uses sodium hydroxide solution as spray liquid for circulation.

[0089] The exhaust gas discharged in Examples 1-2 and Comparative Examples 1-3 was tested, and the results are shown in Table 1. At the same time, the treatment efficiency of different treatment methods was calculated using ammonia as the detection component. The results are shown in Table 1. Figure 7 shown.

[0090] Table 1 Data on the removal effect of waste gas after treatment by different treatment methods

[0091] Combining Table 1 and Figure 7It can be seen from the results that compared with Comparative Examples 1, 3-4, Examples 1-2 of the present invention have better treatment effects, not only can they efficiently remove various malodors in the waste gas, but they can also effectively treat waste gas with more complex components, and at the same time have a longer waste gas treatment time under the same conditions. In addition, although Comparative Example 2 can also effectively purify malodors, it does not use waste liquid treated with PMS (agent C). On the one hand, it will increase the amount of hypochlorous acid solution used, and thus increase the cost of malodor treatment. On the other hand, due to the increase in the amount of hypochlorous acid solution used, it will also lead to an increase in the output of hypochlorous acid waste liquid, which will lead to a relatively higher treatment cost of hypochlorous acid waste liquid. Therefore, from the perspective of the cost of malodor treatment and the cost of waste liquid treatment, the treatment method in Example 1 uses less reagents, produces less waste liquid, has lower costs, and is more environmentally friendly.

[0092] From the above results, it can be seen that the system for treating malodors and odors of the present invention has the advantages of low cost, good purification effect, and low risk of secondary pollution. When used to treat different types of malodorous gases, it can efficiently remove various malodors and odors in the exhaust gas, and can effectively improve the environment around the paper mill. It has the advantages of simple process, convenient operation, low cost, high treatment efficiency, and good removal effect. It also uses less chemicals and produces less waste liquid, is more green and environmentally friendly, has high use value, and has good application prospects.

[0093] The above embodiments are only preferred implementations of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A system for treating bad odor, characterized in that: It comprises an air intake pipe (1), a hypochlorous acid generating device, a spray reaction device, a synergist dosing device and a spray liquid circulation device; The air inlet of the air inlet pipe (1) is in communication with the foul-smelling gas; The hypochlorous acid generating device comprises a hypochlorous acid generator (23), and the hypochlorous acid generator (23) is connected to a hypochlorous acid collection box (24) and a sodium hydroxide collection box (25); The spray reaction device comprises a primary spray tower (31), a secondary spray tower (32) and a tertiary synergistic reaction tower (33) which are connected in sequence; the bottom of the primary spray tower (31) is connected to a primary circulating water tank (312), and the water outlet of the primary circulating water tank (312) is connected to the spray area of ​​the primary spray tower (31) to form a circulating spray passage; the bottom of the secondary spray tower (32) is connected to a secondary circulating water tank (322), and the water outlet of the secondary circulating water tank (322) is connected to the spray area of ​​the secondary spray tower (32) to form a circulating spray passage; the bottom of the tertiary synergistic reaction tower (33) is connected to a tertiary circulating water tank (332), and the water outlet of the tertiary circulating water tank (332) is connected to the spray area of ​​the tertiary synergistic reaction tower (33) to form a circulating spray passage; The water outlet of the hypochlorous acid collection tank (24) is respectively connected to the primary circulating water tank (312) and the secondary circulating water tank (322) via a first reversing valve (54); The water outlet of the sodium hydroxide collection tank (25) is respectively connected to the primary circulating water tank (312) and the secondary circulating water tank (322) via a second reversing valve (55); The synergist dosing device comprises a first medicine box (41), a second medicine box (42) and a third medicine box (43); The spray liquid circulation device comprises a first waste liquid collection tank (52) and a second waste liquid collection tank (53) which are connected in sequence; The water outlet of the first medicine tank (41) is respectively connected to the primary circulating water tank (312) and the secondary circulating water tank (322) via a third reversing valve (56); The water outlet of the second medicine tank (42) is in communication with the water inlet of the tertiary circulating water tank (332); The water outlet of the third medicine box (43) is in communication with the water inlet of the second waste liquid collection box (53); The water inlet of the first waste liquid collection box (52) is in communication with the water outlet of the primary circulating water box (312); a bypass pipe is also provided between the water inlet of the first waste liquid collection box (52) and the water outlet of the primary circulating water box (312); The water inlet of the second waste liquid collection tank (53) is in communication with the water outlet of the secondary circulating water tank (322); The water outlet of the second waste liquid collection tank (53) is respectively connected to the water inlets of the primary circulating water tank (312) and the secondary circulating water tank (322) via a fourth reversing valve (57).

2. The system for treating bad odor according to claim 1, characterized in that: A first dosing pump (411) is provided on the pipeline between the first medicine box (41) and the third reversing valve (56); the first medicine box (41) stores medicine A; the medicine A is at least one of potassium hydrogen phthalate, citric acid, acetic acid, and sulfuric acid; A second dosing pump (421) is provided on the pipeline between the second medicine box (42) and the third-stage circulating water tank (332); the second medicine box (42) stores medicine B; the medicine B is at least one of ascorbic acid, sodium thiosulfate, and calcium sulfite; A third dosing pump (431) is provided on the pipeline between the third drug box (43) and the second waste liquid collection box (53); the third drug box (43) stores a drug C; the drug C is at least one of hydrogen peroxide and peroxymonosulfate; A delivery pump (51) is provided on the pipeline between the second waste liquid collection box (53) and the fourth reversing valve (57).

3. The system for treating bad odor according to claim 2, characterized in that: Also includes: Intelligent control device; the intelligent control device includes a detection module and a control module; The detection module comprises a first pH meter (611), a second pH meter (612), an ORP meter (613), an ammonia nitrogen online monitor (614), a residual chlorine monitor (615), a humidity monitor (616) and a temperature monitor (617); the first pH meter (611) is connected to the primary circulating water tank (312); the second pH meter (612) is connected to the secondary circulating water tank (322); the ORP meter (613) is connected to the secondary circulating water tank (322); the ammonia nitrogen online monitor (614) is connected to the second waste liquid collection tank (53); the residual chlorine monitor (615) is connected to the second waste liquid collection tank (53); the humidity monitor (616) and the temperature monitor (617) are connected to the air intake pipe (1); The control module includes a CPU module, an analog quantity module and a power supply module; the CPU module, the analog quantity module and the power supply module are electrically connected; the CPU module is electrically connected to the hypochlorous acid generating device, the spray reaction device, the synergist dosing device and the spray liquid circulation device; the analog quantity module is electrically connected to the detection module.

4. The system for treating bad odor according to claim 3, characterized in that: The hypochlorous acid generator (23) is connected to a raw material storage tank (22); the raw material storage tank (22) is also connected to a water storage tank; a filter (21) is provided on the pipeline between the water storage tank and the raw material storage tank (22); A hypochlorous acid dosing pump (241) is provided on the pipeline between the hypochlorous acid collection box (24) and the first reversing valve (54); A sodium hydroxide dosing pump (251) is provided on the pipeline between the sodium hydroxide collection box (25) and the second reversing valve (55); A primary circulation pump (311) is provided on the pipeline between the primary circulation water tank (312) and the spraying area of ​​the primary spray tower (31); A secondary circulation pump (321) is provided on the pipeline between the secondary circulation water tank (322) and the spraying area of ​​the secondary spray tower (32); A tertiary circulation pump (331) is provided on the pipeline between the tertiary circulation water tank (332) and the spraying area of ​​the tertiary synergistic reaction tower (33).

5. The system for treating bad odor according to claim 4, characterized in that: The air outlet of the air inlet pipe (1) is connected to the bottom of the first-stage spray tower (31); the air outlet of the first-stage spray tower (31) is located at the top of the tower; the air outlet of the first-stage spray tower (31) is connected to the bottom of the second-stage spray tower (32); the air outlet of the second-stage spray tower (32) is located at the top of the tower; the air outlet of the second-stage spray tower (32) is connected to the bottom of the third-stage synergistic reaction tower (33); The second-level spray tower (32) includes, from bottom to top, a spray reaction zone (324) and a demisting zone (323); The three-stage synergistic reaction tower (33) comprises, from bottom to top, a liquid storage tank (333), a flow guide assembly (334), a filler assembly (335) and a spray assembly (336); an air intake branch pipe is also provided at the bottom of the three-stage synergistic reaction tower (33); an outlet of the air intake branch pipe faces upward and is located above the liquid level in the liquid storage tank (333); the outlet of the air intake branch pipe is located below the flow guide assembly (334), and the vertical projection area of ​​the flow guide assembly (334) is larger than the outlet area of ​​the air intake branch pipe.

6. The system for treating bad odor according to claim 5, characterized in that: The flow guide component (334) is composed of an upper liquid flow guide component (3341) and a lower gas flow guide component (3342); the upper liquid flow guide component (3341) and the lower gas flow guide component (3342) are both solid truncated cones with curved slopes; the upper top of the upper liquid flow guide component (3341) is provided with a plurality of overflow grooves (33411); the bottom of the three-stage synergistic reaction tower (33) is provided with at least three support frames (3343); the lower gas flow guide component (3342) is installed on the support frames (3343) so that the lower gas flow guide component (3342) is installed above the liquid storage tank (333); the lowest point below the lower gas flow guide component (3342) is above the outlet of the intake branch pipe; The packing assembly (335) comprises a bearing element (3351) and a packing (3352), wherein the outer periphery of the bearing element (3351) is connected to the inner wall of the three-stage synergistic reaction tower (33); the bearing element (3351) is formed by stacking multiple layers of coaxial hollow truncated cones; adjacent coaxial hollow truncated cones are symmetrically arranged; the coaxial hollow truncated cones are formed by coaxially connecting multiple conical hollow truncated cone rings of different diameters, and two adjacent conical hollow truncated cone rings are overlapped in an upright and inverted manner, and the ... A V-shaped groove is formed between the hollow truncated cone rings; the opening angle of the V-shaped groove is 5° to 180°; a plurality of holes (3353) are opened on the inner wall of the V-shaped groove; the V-shaped groove is filled with the filler (3352); the filler (3352) is at least one of a structured filler and a bulk filler; a fixed support structure (3354) is provided between two adjacent conical hollow truncated cone rings; the central groove of the bottom coaxial hollow truncated cone in the bearing element (3351) is embedded in the upper part of the upper liquid guide component (3341); The spray assembly (336) comprises a spray distribution pipe (3361), on which a plurality of spray heads (3362) are distributed; the water inlet of the spray distribution pipe (3361) is connected to the water outlet of the tertiary circulating water tank (332).

7. A method for treating bad odor, characterized in that: The system for treating bad odors as claimed in claim 6 is used to treat bad odors.

8. The method according to claim 7, characterized in that When the system is used to treat malodor, the following steps are included: S1, starting the hypochlorous acid generator (23) to produce sodium hydroxide and hypochlorous acid, and transporting them to the primary circulating water tank (312) and the secondary circulating water tank (322) respectively according to process requirements; S2, transporting the malodorous gas from the air inlet pipe (1) to the primary spray tower (31) and the secondary spray tower (32) in sequence, starting the primary circulation pump (311) and the secondary circulation pump (321), and performing primary oxidation degradation treatment on the malodorous gas using a sodium hydroxide solution and a hypochlorous acid solution; S3, transporting the waste gas treated by the secondary spray tower (32) to the tertiary synergistic reaction tower (33) for secondary oxidation degradation treatment, thereby completing deep purification of the malodor.

9. The method according to claim 8, characterized in that In step S1, the pH value of the sodium hydroxide solution in the primary circulating water tank (312) is controlled to be 9.5-12; the increase in the effective chlorine concentration in the secondary circulating water tank (322) is controlled to be 5 mg·L -1 ·h -1 ~80 mg·L -1 ·h -1 .

10. The method according to claim 9, characterized in that In step S2, the first dosing pump (411) is turned on to add agent A to the primary circulating water tank (312) or the secondary circulating water tank (322); during the primary oxidation degradation treatment, when the spraying time of the hypochlorous acid solution reaches 4 hours to 12 hours, the waste liquid in the secondary circulating water tank (322) and the first waste liquid collection tank (52) is discharged into the second waste liquid collection tank (53) according to the discharge volume of the waste liquid being 10% to 50% of the total volume of the waste liquid in the secondary circulating water tank (322); the third dosing pump (431) is turned on to transport agent C to the second waste liquid collection tank (53) until the concentration of agent C in the second waste liquid collection tank (53) is 0.2 g / L to 1.0 g / L; and the waste liquid in the second waste liquid collection tank (53) is treated with agent C until the ammonia nitrogen concentration in the second waste liquid collection tank (53) is less than 1. mg / L, continue to start the third dosing pump (431) to make the concentration of the agent C in the second waste liquid collection tank (53) be 0.4 g / L to 2.4 g / L, use the agent C to react with the chloride ions in the second waste liquid collection tank (53) to produce effective chlorine, until the effective chlorine content of the waste liquid in the second waste liquid collection tank (53) reaches 40 mg / L to 200 mg / L, turn off the hypochlorous acid generator (23), stop delivering hypochlorous acid to the secondary circulating water tank (322), and start the delivery pump (51) to deliver the waste liquid in the second waste liquid collection tank (53) to the primary circulating water tank (312) or the secondary circulating water tank (322), until the waste liquid in the second waste liquid collection tank (53) treats the malodorous gas for 6 h to 12 h. h later, the waste liquid in the second waste liquid collection box (53) is discharged to the outside, while the hypochlorous acid generator (23) continues to produce hypochlorous acid and uses the hypochlorous acid solution to continue to treat the malodorous gas; the excess waste liquid in the second waste liquid collection box (53) is discharged to the outside; In step S3, the second dosing pump (421) is turned on to deliver agent B to the tertiary circulating water tank (332); when the humidity of the malodorous gas in the air intake pipe (1) is less than 90% and the temperature is greater than 65°C, the first dosing pump (411), the second dosing pump (421), and the third dosing pump (431) are turned off; when the humidity of the malodorous gas in the air intake pipe (1) is greater than 95% and the temperature is less than 65°C, the first dosing pump (411), the second dosing pump (421), and the third dosing pump (431) are turned on.

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