Drying waste gas treatment system

Abstract

The utility model relates to the technical field of waste gas treatment systems, in particular to a waste base blank drying waste gas treatment system. The waste gas treatment system is connected to an exhaust port of a drying room for drying bio-based blanks, and comprises a preheater, an SCR reactor, a spray tower, a first-stage activated carbon adsorber, a second-stage activated carbon adsorber, a fan and an exhaust funnel which are sequentially connected, wherein the preheater is used for heating dried waste gas; the SCR reactor is used for carrying out denitration treatment on the preheated gas; spraying liquid is arranged in the spraying tower and used for removing pollutants in waste gas, and the first-stage activated carbon adsorber and the second-stage activated carbon adsorber are used for adsorbing organic components in the waste gas. According to the utility model, oxynitride in the drying waste gas of the biological waste base blank is removed through the SCR reactor, then pollutants in the waste gas are removed through the spray tower, and finally organic components in the waste gas are adsorbed through the activated carbon adsorber, so that the waste gas is purified and then discharged, and the emission standard is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to waste gas treatment technical field, especially a kind of drying waste gas treatment system. BACKGROUND

[0002] In prior art, waste gas generated after waste egg and other biological embryos are dried is generally directly discharged into air, but the emission concentration of nitrogen oxides in waste gas fluctuates greatly and has the risk of exceeding the standard, and the foul odor of exhaust gas emission affects the surrounding atmospheric environment. UTILITY MODEL CONTENT

[0003] In order to solve the problem of existing technology that waste gas generated after biological embryos are dried is directly discharged into air, which has the risk of exceeding the standard of nitrogen oxides emission concentration and producing foul odor, the utility model provides a drying waste gas treatment system.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] A drying waste gas treatment system, the waste gas treatment system is connected to the exhaust port of the drying room for drying biological embryos, and includes a preheater, an SCR reactor, a spray tower, a primary activated carbon adsorber, a secondary activated carbon adsorber, a fan and an exhaust cylinder connected in turn: the preheater is used for heating the waste gas after drying; the SCR reactor is used for denitration treatment of the preheated gas; the spray tower is provided with a spray liquid for removing pollutants in the waste gas, and the primary activated carbon adsorber and the secondary activated carbon adsorber are used for adsorbing organic components in the waste gas.

[0006] Further, the waste gas in the spray tower flows from bottom to top.

[0007] Further, the inlet of the spray tower is connected with an induced draft fan.

[0008] Further, an alkali solution tank is arranged below the spray tower, the alkali solution tank is connected with a circulating pipeline, a circulating pump is arranged on the circulating pipeline, the circulating pipeline is provided with a plurality of branches, atomizing nozzles are arranged on the branches, and hollow ball fillers are arranged below the atomizing nozzles in the spray tower.

[0009] Further, the SCR reactor and the spray tower are connected by a long pipeline. The long pipeline connection can place the subsequent equipment of the SCR reactor in other positions, reducing the occupied area of the equipment, and on the other hand, the gas discharged by the SCR can be fully cooled during the long pipeline transportation, preventing the gas temperature in the spray tower from being too high.

[0010] Further, the preheater and the SCR reactor are arranged beside the drying room, the spray tower, the first activated carbon adsorber, the second activated carbon adsorber, the fan and the exhaust cylinder are arranged on the roof of the factory building, so that the space of the ground is not occupied, space is saved, the exhaust cylinder can be arranged along the wall surface, and installation is facilitated.

[0011] Further, the first activated carbon adsorber and the second activated carbon adsorber adopt water-resistant honeycomb carbon.

[0012] Beneficial effects: the nitrogen oxide compounds in the drying waste gas of the biological waste embryo are removed through the SCR reactor, then the pollutants in the waste gas are removed through the spray tower, finally the foul odor in the waste gas is adsorbed through the activated carbon adsorber, so that the waste gas is purified and discharged again, and meets the discharge standard. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will be briefly introduced the drawings needed to be used in the embodiment description, obviously, the drawings in the following description are only some embodiments of the utility model, for the ordinary skilled in the art, under the premise of not paying the creative labor, still can obtain other drawings according to these drawings.

[0014] Fig. 1 It is the processing process diagram of the drying waste gas treatment system of the utility model;

[0015] Fig. 2 It is the overall overhead schematic diagram of the drying waste gas treatment system of the utility model;

[0016] Fig. 3 It is the overhead schematic diagram of the preheater and the SCR reactor located in the first floor;

[0017] Fig. 4 It is the overhead schematic diagram of the spray tower, the first activated carbon adsorber, the second activated carbon adsorber, the fan and the exhaust cylinder located in the second floor;

[0018] Fig. 5 It is the structure schematic diagram of the spray tower.

[0019] 1, drying room, 2, preheater, 3, SCR reactor, 4, spray tower, 41, lye tank, 42, circulating pump, 43, atomizing nozzle, 44, hollow ball filler, 5, first activated carbon adsorber, 6, second activated carbon adsorber, 7, fan, 8, exhaust cylinder, 9, induced draft fan, DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is merely illustrative in nature and in no way should be construed as any limitation on the present application and its applications or uses. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of the present application.

[0021] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0022] The relative arrangement of components and steps, numerical expressions, and numerical values set forth in the embodiments are not intended to limit the scope of the present application unless specifically stated otherwise. At the same time, it should be understood that the sizes of the various parts shown in the drawings are not drawn in proportion to the actual proportions. The techniques, methods and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as part of the specification under appropriate circumstances. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, and not as a limitation. Therefore, other examples of the example embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so further discussion is not necessary once an item is defined in one drawing.

[0023] In the description of the present application, it should be understood that the orientation words such as "front, rear, upper, lower, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0024] For purposes of the description hereinafter, spatial or directional terms, such as "above", "below", "top", "bottom", "upper", "lower", and the like, can be used where reference is made to one structure or feature in relation to other structures or features. It is to be understood that such spatial and directional terms are in fact intended to encompass different orientations of the device or feature in use or operation in addition to the orientation depicted in the figures. For example, if the device depicted in the figures is inverted, then the description of a structure or feature as "above" or "below" another structure or feature is intended to encompass both orientations of the device or feature. Accordingly, the exemplary term "above" can encompass both "above" and "below". The structures can also be oriented in other ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0025] In addition, it should be noted that the use of "first", "second", and the like words of distinction do not connote any actual physical or chronological order, but are merely used for convenience and identification only and are not intended to connote direction, hierarchy, or importance of one element over another. In addition, the use of "first", "second", and the like words of distinction are not intended to connote a limitation on the scope of the present application, unless otherwise stated.

[0026] As Figs. 1-5 The drying waste gas treatment system is connected to the exhaust port of the drying room 1 for drying the bio-based embryo, and comprises a preheater 2, an SCR reactor 3, a spray tower 4, a first activated carbon adsorber 5, a second activated carbon adsorber 6, a fan 7 and an exhaust cylinder 8 connected in sequence: the preheater 2 is used for heating the waste gas of drying; the SCR reactor 3 is used for carrying out denitration treatment on the preheated gas; the spray tower 4 is provided with a spraying liquid for removing pollutants in the waste gas, and the first activated carbon adsorber 5 and the second activated carbon adsorber 6 are used for adsorbing organic components in the waste gas.

[0027] The reducing agent used in the SCR denitration process is ammonia, and the most commonly used is ammonia water and urea solution. The project adopts 32.5% urea, which is an SCR denitration liquid for diesel vehicles. The concentration is anti-cold below 11 degrees, does not freeze, is convenient to supplement, can be used directly, and does not need to be compounded. A double-fluid spray gun is adopted, the urea atomization particle size is less than 30um SMD, the urea aqueous solution is fully hydrolyzed and pyrolyzed under the flue gas temperature below 200 DEG C, the utilization rate of urea is improved, and crystallization is avoided. The spray gun atomization diffusion angle is only 15 DEG, the long mist distance is realized, the full evaporation is realized, and the crystallization phenomenon caused by the local flue gas cooling in the short mist distance is avoided.

[0028] The waste gas in the spray tower 4 flows from bottom to top. The inlet of the spray tower 4 is connected with an air draught fan 9. A lye tank 41 is arranged below the spray tower 4, the lye tank 41 is connected with a circulating pipeline, the circulating pipeline is provided with a circulating pump 42, the circulating pipeline is provided with a plurality of branches, the branches are provided with atomizing nozzles 43, and the spray tower 4 is provided with hollow ball fillers 44 below the atomizing nozzles 43. The pollutants are sucked into the lower part of the spray tower 4 by the suction force of the air draught fan 9; the airflow in the tower flows from bottom to top along the tangential direction of the spray tower 4, and is sprayed in a misty state by the first-stage absorption liquid, at this time, part of the pollutants are absorbed; the pollutants not absorbed are dispersed and condensed upward by the hollow ball fillers 44, and then are sprayed and absorbed by the second-stage absorption liquid, and the tail gas is discharged after passing through a wind-blocking and demisting device. The absorption liquid is recycled, is sprayed downward by the atomizing nozzles 43 of the umbrella valve by high pressure of the circulating pump 42, the pollutants flow from bottom to top, and the gas-liquid phases fully collide and contact, so that the pollutants are absorbed by the absorption liquid to achieve the purpose of removing the pollutants.

[0029] The SCR reactor 3 is connected with the spray tower 4 through a long pipeline. The preheater 2 and the SCR reactor 3 are arranged beside the drying room 1, and the spray tower 4, the first-stage activated carbon adsorber 5, the second-stage activated carbon adsorber 6, the fan 7 and the exhaust cylinder 8 are arranged on the roof of the factory building.

[0030] The first-stage activated carbon adsorber 5 and the second-stage activated carbon adsorber 6 adopt water-resistant honeycomb carbon. The activated carbon is a kind of high-efficiency adsorption material, has high adsorption effect on toxic and harmful gases, has fast adsorption and desorption speed, is not afraid of acid and alkali and has corrosion-resistant performance, has obvious purification effect on organic waste gas containing benzene series, sulfur dioxide, carbon monoxide, nitrogen oxide, hydrogen sulfide, petroleum gas and odor, and the purification efficiency reaches more than 95%. The adsorption efficiency of the project is conservatively estimated to be 80%. The activated carbon adsorber is divided into an air inlet section, a carbon filtering section and an air outlet section, and the filtering section is filled with honeycomb activated carbon. The organic waste gas enters the box from the air inlet, and the pollutants in the waste gas are removed by the adsorption capacity of the honeycomb activated carbon, and the tail gas after purification is discharged into the atmosphere by the ventilator.

[0031] Working principle:

[0032] The drying waste gas is firstly heated to about 160 DEG C by a preheater, and then introduced into the SCR reactor 3 (SCR denitration system). Before entering the SCR reactor 3, a urea solution atomizing spraying system is arranged, and a mixing device is arranged, so that the flue gas and the atomized urea are fully mixed before entering the SCR reactor 3, and under the action of the catalyst, the selective catalytic reduction reaction occurs, the NOx is reduced into N2 and H2O, and then enters the spray tower 4. The waste gas in the spray tower 4 flows along the tangent of the waste gas purification tower from bottom to top, collides with and fully contacts the spraying liquid from top to bottom, and the gas and liquid fully react and absorb, so that the pollutants in the waste gas are removed, and then enters the first activated carbon adsorber 5. The waste gas is reasonably distributed, so that the waste gas uniformly passes through the flow section of the activated carbon layer in the fixed adsorption bed, and in a certain residence time, physical adsorption (also called van der Waals adsorption) is generated due to the mutual attraction between the activated carbon surface and the organic waste gas molecules. The characteristics are that: the adsorbate (organic waste gas) and the adsorbent (activated carbon) do not react with each other, the process is relatively fast, the nature of the adsorbent does not change in the adsorption process, and the adsorption process is reversible; the organic components in the waste gas are adsorbed on the surface of the activated carbon, so that the waste gas is purified. The purified waste gas is further adsorbed by the second activated carbon adsorber 6, and then discharged through the exhaust pipe 8.

[0033] The drying waste gas treatment system of the utility model not only can be used for drying waste gas treatment of waste chicken egg embryo, but also can be used for drying waste gas treatment of other biological embryo.

[0034] The above is only the preferred specific implementation manner of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the utility model concept of the utility model within the technical range disclosed by the utility model, and all should be covered in the protection scope of the utility model.

Claims

1. A dryer exhaust gas treatment system characterized by: The exhaust treatment system is connected to the exhaust port of the drying room (1) for drying the bio-based embryo, comprising a preheater (2), an SCR reactor (3), a spray tower (4), a first activated carbon adsorber (5), a second activated carbon adsorber (6), a fan (7) and an exhaust cylinder (8) connected in sequence: the preheater (2) is used for heating the dried exhaust gas; the SCR reactor (3) is used for denitration treatment of the preheated gas; the spray tower (4) is provided with a spraying liquid for removing pollutants in the exhaust gas, and the first activated carbon adsorber (5) and the second activated carbon adsorber (6) are used for adsorbing organic components in the exhaust gas.

2. A drying exhaust gas treatment system according to claim 1, characterized in that: The exhaust gas in the spray tower (4) flows from bottom to top.

3. A drying exhaust treatment system according to claim 2, wherein: The inlet of the spray tower (4) is connected with an induced draft fan (9).

4. A drying exhaust treatment system according to claim 2, wherein: A lye tank (41) is arranged below the spray tower (4), the lye tank (41) is connected with a circulating pipeline, a circulating pump (42) is arranged on the circulating pipeline, the circulating pipeline is provided with a plurality of branches, atomizing nozzles (43) are arranged on the branches, and hollow ball fillers (44) are arranged below the atomizing nozzles (43) in the spray tower (4).

5. A drying exhaust treatment system according to claim 1, wherein: The SCR reactor (3) and the spray tower (4) are connected by a long pipeline.

6. A drying exhaust treatment system according to claim 1, wherein: The preheater (2) and the SCR reactor (3) are arranged beside the drying room (1), and the spray tower (4), the first activated carbon adsorber (5), the second activated carbon adsorber (6), the fan (7) and the exhaust cylinder (8) are arranged on the roof of the factory building.

7. A drying exhaust treatment system according to claim 1, wherein: The first activated carbon adsorber (5) and the second activated carbon adsorber (6) adopt water-resistant honeycomb carbon.

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