Multi-stage reaction type desulfurization and denitrification waste gas treatment equipment

Abstract

The invention discloses multistage reaction type desulfurization and denitrification waste gas treatment equipment which comprises a gas inlet pipeline, a primary filtering unit, a preheating unit, a primary desulfurization reaction unit, a primary denitrification reaction unit, a cooling unit, a secondary desulfurization reaction unit, a secondary denitrification reaction unit and a gas outlet pipeline which are connected in sequence, compared with the prior art, the device has the advantages that sulfur oxides and nitrogen oxides can be deeply treated through the multi-stage treatment process, the treatment efficiency is improved, large-particle impurities can be effectively removed through multiple layers of metal filter screens in the primary filter unit, part of harmful substances easy to adsorb can be removed through an activated carbon adsorption layer, good conditions are created for follow-up reaction, and the service life of the device is prolonged. The preheating unit can heat the waste gas to a preset temperature range of 100-200 DEG C so as to be beneficial to the first-stage desulfurization reaction, and the cooling unit can cool the reacted waste gas to 50-80 DEG C so as to guarantee the stable operation of equipment and the effect of a subsequent treatment link.

Description

Technical Field

[0001] The present invention relates to the technical field of waste gas treatment devices, and in particular to multi-stage reaction type desulfurization and denitrification waste gas treatment equipment. Background Art

[0002] With the rapid development of industry, the problem of waste gas emissions has become increasingly serious, among which sulfur oxides (such as sulfur dioxide, etc.) and nitrogen oxides (such as nitrogen monoxide, nitrogen dioxide, etc.) are the main pollutants. These pollutants not only cause environmental problems such as acid rain and photochemical smog, but also have serious harm to human health. Traditional desulfurization and denitrification methods often have problems such as low treatment efficiency and incomplete treatment, and cannot meet the increasingly stringent environmental protection requirements. Therefore, there is an urgent need for an efficient and comprehensive waste gas treatment equipment to solve these problems. Summary of the invention

[0003] 1. Technical issues

[0004] The present invention aims to provide a multi-stage reaction type desulfurization and denitrification waste gas treatment equipment to solve the problem that the existing equipment cannot effectively remove sulfur oxides and nitrogen oxides in the waste gas.

[0005] (II) Technical content

[0006] In order to solve the above technical problems, the technical solution of the present invention is: a multi-stage reaction type desulfurization and denitrification waste gas treatment equipment, comprising:

[0007] An air intake pipe, used for introducing exhaust gas containing sulfur oxides and nitrogen oxides, wherein a flow regulating valve is provided on the air intake pipe;

[0008] A primary filter unit is connected to the air intake duct, and the primary filter unit includes a multi-layer metal filter and an activated carbon adsorption layer, and is used to remove large particle impurities and some easily adsorbed harmful substances in the exhaust gas;

[0009] A preheating unit connected to the primary filtering unit, the preheating unit comprising an electric heating plate, a temperature sensor and a controller, and used to heat the exhaust gas to a predetermined temperature range, the predetermined temperature range being 100-200° C.;

[0010] A primary desulfurization reaction unit is connected to the preheating unit, wherein the primary desulfurization reaction unit comprises a reaction tower, wherein a multi-layer atomizing nozzle is arranged inside the reaction tower for spraying a desulfurization agent, wherein the desulfurization agent is a calcium-based desulfurization agent;

[0011] A primary denitration reaction unit is connected to the primary desulfurization reaction unit, wherein the primary denitration reaction unit includes a denitration reactor, wherein a honeycomb catalyst is provided in the denitration reactor for catalyzing the reaction between nitrogen oxides in the exhaust gas and ammonia, wherein the ammonia is transported to the denitration reactor through an ammonia supply pipeline, wherein a flow controller is provided on the ammonia supply pipeline;

[0012] A cooling unit connected to the primary denitration reaction unit, the cooling unit comprising a water-cooled radiator for cooling the waste gas after the reaction to 50-80° C.;

[0013] A secondary desulfurization reaction unit is connected to the cooling unit, wherein the secondary desulfurization reaction unit comprises a venturi scrubber, wherein an alkaline scrubbing liquid is provided in the venturi scrubber for further removing residual sulfur oxides in the exhaust gas, and the alkaline scrubbing liquid is circulated through a scrubbing liquid circulation system;

[0014] A secondary denitration reaction unit is connected to the secondary desulfurization reaction unit, wherein the secondary denitration reaction unit comprises a photocatalytic reactor, wherein a photocatalyst and an ultraviolet light source are provided in the photocatalytic reactor for further catalytically decomposing residual nitrogen oxides in the exhaust gas;

[0015] The gas outlet pipe is connected to the secondary denitration reaction unit and is used to discharge the treated waste gas. A gas composition detection sensor is provided on the gas outlet pipe.

[0016] Furthermore, the mesh aperture of the multi-layer metal filter gradually decreases from the air inlet side to the air outlet side, the mesh aperture of the outermost layer is 1-3 mm, and the mesh aperture of the innermost layer is 0.1-0.3 mm.

[0017] Furthermore, the thickness of the activated carbon adsorption layer is 10-30 cm, and the specific surface area of ​​the activated carbon is not less than 800 m 2 / g.

[0018] Furthermore, the pore density of the honeycomb catalyst is 200-400 pores / square inch, and the active components of the catalyst include titanium dioxide and vanadium pentoxide.

[0019] Furthermore, the water-cooled radiator comprises a cooling water pipe, a circulation pump and a cooling water tank, and the cooling water pipe is coiled in a serpentine shape in the cooling unit.

[0020] Furthermore, the flow rate at the throat of the Venturi scrubber is 50-100 m / s, and the pH value of the alkaline scrubbing liquid is maintained at 9-11.

[0021] Furthermore, the photocatalyst is a titanium dioxide nanotube array, the wavelength of the ultraviolet light source is 254-365nm, and the light intensity is 10-50mW / cm 2 Adjust within the range.

[0022] Furthermore, the washing liquid circulation system comprises a washing liquid pump and a liquid replenishing tank, wherein the washing liquid pump is used to convey the alkaline washing liquid, and the liquid replenishing tank is used to replenish the consumed alkaline washing liquid.

[0023] (III) Technical Effect

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] 1. Efficient treatment: Multi-stage treatment process, including a primary desulfurization reaction unit (using calcium-based desulfurizer sprayed through multi-layer atomizing nozzles), a primary denitrification reaction unit (using honeycomb catalysts to catalyze the reaction of nitrogen oxides and ammonia), a secondary desulfurization reaction unit (the alkaline washing liquid in the Venturi scrubber further removes sulfur oxides) and a secondary denitrification reaction unit (the photocatalytic reactor uses photocatalysts and ultraviolet light sources to further decompose nitrogen oxides). This multi-stage structure can deeply treat sulfur oxides and nitrogen oxides and improve treatment efficiency.

[0026] 2. Pretreatment optimization: The mesh size of the multi-layer metal filter in the primary filtration unit gradually decreases from the air inlet side to the air outlet side (the mesh size of the outermost layer is 1-3mm, and the mesh size of the innermost layer is 0.1-0.3mm), which can effectively remove large particles of impurities. The activated carbon adsorption layer (thickness is 10-30cm, specific surface area is not less than 800m 2 / g) can remove some easily adsorbed harmful substances and create good conditions for subsequent reactions.

[0027] 3. Reasonable temperature control: The preheating unit can heat the exhaust gas to a predetermined temperature range of 100-200°C, which is conducive to the primary desulfurization reaction. The cooling unit can cool the exhaust gas after the reaction to 50-80°C to ensure the stable operation of the equipment and the effect of subsequent processing links. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The three-dimensional structure diagram of the multi-stage reaction type desulfurization and denitrification waste gas treatment equipment of the present invention is shown in FIG. Figure 1 .

[0029] Figure 2 The three-dimensional structure diagram of the multi-stage reaction type desulfurization and denitrification waste gas treatment equipment of the present invention is shown in FIG. Figure 2 .

[0030] Figure 3 The three-dimensional structure diagram of the multi-stage reaction type desulfurization and denitrification waste gas treatment equipment of the present invention is shown in FIG. Figure 3 .

[0031] Figure 4 It is a schematic diagram of the main structure of the multi-stage reaction desulfurization and denitrification waste gas treatment equipment of the present invention.

[0032] Figure 5 It is a schematic diagram of the top view of the structure of the multi-stage reaction type desulfurization and denitrification waste gas treatment equipment of the present invention.

[0033] Figure 6 This is a schematic diagram of the cross-sectional structure of the multi-stage reaction type desulfurization and denitrification waste gas treatment equipment of the present invention. Figure 1 .

[0034] Figure 7 This is a schematic diagram of the cross-sectional structure of the multi-stage reaction type desulfurization and denitrification waste gas treatment equipment of the present invention. Figure 2 .

[0035] Figure 8 This is a schematic diagram of the cross-sectional structure of the multi-stage reaction type desulfurization and denitrification waste gas treatment equipment of the present invention. Figure 3 .

[0036] As shown in the figure: 1. Air intake pipe; 2. Flow regulating valve; 3. Primary filter unit; 4. Multi-layer metal filter; 5. Activated carbon adsorption layer; 6. Preheating unit; 7. Electric heating plate; 8. Temperature sensor; 10. Reaction tower; 11. Multi-layer atomizing nozzle; 14. Denitration reactor; 15. Honeycomb catalyst; 16. Ammonia supply pipeline; 17. Flow controller; 18. Cooling unit; 22. Venturi scrubber; 26. Photocatalytic reactor; 27. Photocatalyst; 28. Ultraviolet light source; 29. ​​Air outlet pipe; 30. Gas composition detection sensor; 35. Cooling water pipe; 36. Cooling water tank; 37. Circulation pump; 38. Washing liquid pump; 40. Liquid replenishing tank; 41. Circulation liquid pump connecting the reaction tower and the multi-layer atomizing nozzle. DETAILED DESCRIPTION

[0037] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside", "center", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation structure and operation, and therefore cannot be understood as a limitation on the present invention.

[0038] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "provided with", "installed", "connected", "connected" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, it can be an electrical connection, it can be a direct connection, it can be indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0040] Combined with Figure 1 To Attachment Figure 8 , multi-stage reaction desulfurization and denitrification waste gas treatment equipment, including:

[0041] An air intake pipe 1 is used to introduce exhaust gas containing sulfur oxides and nitrogen oxides, and a flow regulating valve 2 is provided on the air intake pipe 1;

[0042] The primary filter unit 3 is connected to the air intake pipe 1. The primary filter unit 3 includes a multi-layer metal filter 4 and an activated carbon adsorption layer 5, which is used to remove large particle impurities and some easily adsorbed harmful substances in the exhaust gas. The thickness of the activated carbon adsorption layer 5 is 10-30 cm, and the specific surface area of ​​the activated carbon is not less than 800 m 2 / g, the mesh size of the multi-layer metal filter 4 gradually decreases from the air inlet side to the air outlet side, the mesh size of the outermost layer is 1-3mm, and the mesh size of the innermost layer is 0.1-0.3mm;

[0043] A preheating unit 6 connected to the primary filtering unit 3, the preheating unit 6 comprising an electric heating plate 7, a temperature sensor 8 and a controller, for heating the exhaust gas to a predetermined temperature range, the predetermined temperature range being 100-200°C;

[0044] A primary desulfurization reaction unit is connected to the preheating unit 6, and the primary desulfurization reaction unit includes a reaction tower 10, and a multi-layer atomizing nozzle 11 is arranged inside the reaction tower 10 for spraying a desulfurization agent, and the desulfurization agent is a calcium-based desulfurization agent;

[0045] A primary denitration reaction unit is connected to the primary desulfurization reaction unit, the primary denitration reaction unit includes a denitration reactor 14, a honeycomb catalyst 15 is provided in the denitration reactor 14, and is used to catalyze the reaction between nitrogen oxides in the exhaust gas and ammonia. The pore density of the honeycomb catalyst 15 is 200-400 pores / square inch, and the catalyst active components include titanium dioxide and vanadium pentoxide. The ammonia is transported to the denitration reactor 14 through an ammonia supply pipeline 16, and a flow controller 17 is provided on the ammonia supply pipeline 16;

[0046] A cooling unit 18 is connected to the primary denitration reaction unit 13. The cooling unit 18 includes a water-cooled radiator for cooling the exhaust gas after the reaction to 50-80° C. The water-cooled radiator includes a cooling water pipe 35, a circulating pump 37 and a cooling water tank 36. The cooling water pipe 35 is coiled in the cooling unit 18 in a serpentine shape.

[0047] A secondary desulfurization reaction unit is connected to the cooling unit 18. The secondary desulfurization reaction unit includes a venturi scrubber 22. The venturi scrubber 22 is provided with an alkaline scrubbing liquid for further removing residual sulfur oxides in the exhaust gas. The alkaline scrubbing liquid is circulated through a scrubbing liquid circulation system. The scrubbing liquid circulation system includes a scrubbing liquid pump 38 and a replenishing tank 40. The scrubbing liquid pump 38 is used to transport the alkaline scrubbing liquid. The replenishing tank 40 is used to replenish the consumed alkaline scrubbing liquid. The flow rate at the throat of the venturi scrubber 22 is 50-100 m / s, and the pH value of the alkaline scrubbing liquid is maintained at 9-11;

[0048] The secondary denitration reaction unit is connected to the secondary desulfurization reaction unit. The secondary denitration reaction unit includes a photocatalytic reactor 26. The photocatalytic reactor 26 is provided with a photocatalyst 27 and an ultraviolet light source 28 for further catalytically decomposing the residual nitrogen oxides in the exhaust gas. The photocatalyst 27 is a titanium dioxide nanotube array. The wavelength of the ultraviolet light source 28 is 254-365nm, and the light intensity is 10-50mW / cm 2 Adjustment within the range;

[0049] The gas outlet pipe 29 is connected to the secondary denitration reaction unit and is used to discharge the treated waste gas. A gas composition detection sensor 30 is provided on the gas outlet pipe 29 .

[0050] The specific working process of the multi-stage reaction type desulfurization and denitrification waste gas treatment equipment of the present invention is as follows:

[0051] 1. Exhaust gas containing sulfur oxides and nitrogen oxides enters the equipment through the intake pipe 1. The flow regulating valve 2 on the intake pipe 1 can adjust the flow of the exhaust gas according to the actual treatment needs to ensure that the amount of exhaust gas entering the subsequent treatment unit is within an appropriate range.

[0052] 2. The exhaust gas enters the primary filter unit 3, which includes a multi-layer metal filter 4 and an activated carbon adsorption layer 5. The mesh size of the multi-layer metal filter 4 gradually decreases from the air inlet side to the air outlet side. The mesh size of the outermost layer is 1-3mm, and the mesh size of the innermost layer is 0.1-0.3mm, which can effectively intercept large particles of impurities in the exhaust gas. The exhaust gas then passes through the activated carbon adsorption layer 5, which has a thickness of 10-30cm and an activated carbon specific surface area of ​​not less than 800m 2 / g, it can adsorb some easily adsorbed harmful substances. After primary filtration, large particles and some harmful substances in the exhaust gas are removed.

[0053] 3. The exhaust gas after primary filtration enters the preheating unit 6. The electric heating plate 7 in the preheating unit 6 heats the exhaust gas to a predetermined temperature range of 100-200°C under the coordinated action of the temperature sensor 8 and the controller, providing suitable temperature conditions for the subsequent primary desulfurization reaction.

[0054] 4. The preheated waste gas enters the reaction tower 10 of the primary desulfurization reaction unit, and the multi-layer atomizing nozzle 11 arranged inside the reaction tower 10 sprays the calcium-based desulfurizer into the tower. The waste gas is fully in contact with the atomized desulfurizer, a desulfurization reaction occurs, and some sulfur oxides in the waste gas are removed.

[0055] 5. The exhaust gas that has completed the primary desulfurization reaction enters the denitration reactor 14 of the primary denitration reaction unit, and ammonia is transported to the denitration reactor 14 through the ammonia supply pipeline 16. The flow controller 17 on the ammonia supply pipeline 16 accurately controls the ammonia flow rate. The honeycomb catalyst 15 in the denitration reactor 14 has a pore density of 200-400 pores / square inch. The active components of the catalyst include titanium dioxide and vanadium pentoxide, which can catalyze the reaction between nitrogen oxides in the exhaust gas and ammonia, and effectively remove part of the nitrogen oxides in the exhaust gas.

[0056] 6. The exhaust gas after the primary denitration reaction enters the cooling unit 18, and the water-cooled radiator of the cooling unit 18 starts to work. The water-cooled radiator includes a cooling water pipe 35, a circulating pump 37 and a cooling water tank 36. The cooling water pipe 35 is coiled in the cooling unit 18 in a serpentine shape. The circulating pump 37 circulates the water in the cooling water tank 36 in the cooling water pipe 35 to cool the exhaust gas after the reaction to 50-80°C.

[0057] 7. The cooled exhaust gas enters the Venturi scrubber 22 of the secondary desulfurization reaction unit. The Venturi scrubber 22 is provided with alkaline scrubbing liquid. The flow rate at the throat is 50-100m / s, and the pH value of the alkaline scrubbing liquid is maintained at 9-11, which can further remove the residual sulfur oxides in the exhaust gas. The alkaline scrubbing liquid is circulated through the scrubbing liquid circulation system. The scrubbing liquid circulation system includes a scrubbing liquid pump 38 and a liquid replenishing tank 40. The scrubbing liquid pump 38 is responsible for conveying the alkaline scrubbing liquid. When the alkaline scrubbing liquid is consumed, the liquid replenishing tank 40 can be replenished.

[0058] 8. The exhaust gas after the secondary desulfurization reaction enters the photocatalytic reactor 26 of the secondary denitrification reaction unit. The photocatalytic reactor 26 is provided with a titanium dioxide nanotube array photocatalyst 27 and a light intensity of 10-50 mW / cm 2 The ultraviolet light source 28 which is adjustable within a range further catalytically decomposes the residual nitrogen oxides in the exhaust gas.

[0059] 9. The exhaust gas after the above-mentioned multi-stage desulfurization and denitrification treatment is discharged through the exhaust pipe 29. The gas composition detection sensor 30 on the exhaust pipe 29 performs real-time detection on the exhaust gas to ensure that the sulfur oxide and nitrogen oxide content in the exhaust gas meets the environmental emission standards.

[0060] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. Multi-stage reaction desulfurization and denitrification waste gas treatment equipment, characterized in that: include: An air intake pipe (1) is used to introduce exhaust gas containing sulfur oxides and nitrogen oxides, and a flow regulating valve (2) is provided on the air intake pipe (1); A primary filter unit (3) is connected to the air intake pipe (1), wherein the primary filter unit (3) comprises a multi-layer metal filter (4) and an activated carbon adsorption layer (5), and is used to remove large particle impurities and some easily adsorbed harmful substances in the exhaust gas; A preheating unit (6) connected to the primary filtering unit (3), the preheating unit (6) comprising an electric heating plate (7), a temperature sensor (8) and a controller, and used for heating the exhaust gas to a predetermined temperature range, the predetermined temperature range being 100-200° C.; A primary desulfurization reaction unit is connected to the preheating unit (6), the primary desulfurization reaction unit comprises a reaction tower (10), a multi-layer atomizing nozzle (11) is arranged inside the reaction tower (10) for spraying a desulfurization agent, the desulfurization agent is a calcium-based desulfurization agent; A primary denitration reaction unit is connected to the primary desulfurization reaction unit, the primary denitration reaction unit comprises a denitration reactor (14), a honeycomb catalyst (15) is provided in the denitration reactor (14), and is used to catalyze the reaction between nitrogen oxides in the exhaust gas and ammonia. The ammonia is transported to the denitration reactor (14) through an ammonia supply pipeline (16), and a flow controller (17) is provided on the ammonia supply pipeline (16); A cooling unit (18) is connected to the primary denitration reaction unit (13), wherein the cooling unit (18) comprises a water-cooled radiator for cooling the waste gas after the reaction to 50-80° C.; A secondary desulfurization reaction unit is connected to the cooling unit (18), wherein the secondary desulfurization reaction unit comprises a venturi scrubber (22), wherein an alkaline scrubbing liquid is provided in the venturi scrubber (22) for further removing residual sulfur oxides in the exhaust gas, and wherein the alkaline scrubbing liquid is circulated through a scrubbing liquid circulation system; A secondary denitration reaction unit is connected to the secondary desulfurization reaction unit, wherein the secondary denitration reaction unit comprises a photocatalytic reactor (26), wherein a photocatalyst (27) and an ultraviolet light source (28) are provided in the photocatalytic reactor (26) for further catalytically decomposing residual nitrogen oxides in the exhaust gas; The gas outlet pipe (29) is connected to the secondary denitration reaction unit and is used to discharge the treated waste gas. The gas outlet pipe (29) is provided with a gas component detection sensor (30).

2. The multi-stage reaction type desulfurization and denitrification waste gas treatment equipment according to claim 1 is characterized in that: The mesh aperture of the multi-layer metal filter (4) gradually decreases from the air inlet side to the air outlet side, the mesh aperture of the outermost layer is 1-3 mm, and the mesh aperture of the innermost layer is 0.1-0.3 mm.

3. The multi-stage reaction type desulfurization and denitrification waste gas treatment equipment according to claim 1 is characterized in that: The thickness of the activated carbon adsorption layer (5) is 10-30 cm, and the specific surface area of ​​the activated carbon is not less than 800 m 2 / g.

4. The multi-stage reaction type desulfurization and denitrification waste gas treatment equipment according to claim 1 is characterized in that: The pore density of the honeycomb catalyst (15) is 200-400 pores / square inch, and the catalyst active components include titanium dioxide and vanadium pentoxide.

5. The multi-stage reaction type desulfurization and denitrification waste gas treatment equipment according to claim 1 is characterized in that: The water-cooled radiator comprises a cooling water pipe (35), a circulation pump (37) and a cooling water tank (36); the cooling water pipe (35) is coiled in a serpentine shape inside the cooling unit (18).

6. The multi-stage reaction type desulfurization and denitrification waste gas treatment equipment according to claim 1 is characterized in that: The flow rate at the throat of the Venturi scrubber (22) is 50-100 m / s, and the pH value of the alkaline scrubbing liquid is maintained at 9-11.

7. The multi-stage reaction type desulfurization and denitrification waste gas treatment equipment according to claim 1 is characterized in that: The photocatalyst (27) is a titanium dioxide nanotube array, the wavelength of the ultraviolet light source (28) is 254-365nm, and the light intensity is 10-50mW / cm 2 Adjust within the range.

8. The multi-stage reaction type desulfurization and denitrification waste gas treatment equipment according to claim 1 is characterized in that: The washing liquid circulation system comprises a washing liquid pump (38) and a liquid replenishing tank (40), wherein the washing liquid pump (38) is used to transport alkaline washing liquid, and the liquid replenishing tank (40) is used to replenish consumed alkaline washing liquid.

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