Integrated serial SCR (Selective Catalytic Reduction) denitration system

Abstract

The invention provides an integrated serial SCR (Selective Catalytic Reduction) denitration system, which belongs to the technical field of waste gas treatment and comprises a denitration assembly, an ammonia supply assembly, a chimney and a booster fan, the denitration assembly comprises a tower body, and a first-stage grid, a first-stage reactor, a second-stage grid and a second-stage reactor which are arranged in the tower body and are sequentially arranged from bottom to top; the ammonia supply assembly comprises an ammonia water tank and two ammonia water evaporators, the two ammonia water evaporators are both communicated with the ammonia water tank, the ammonia water evaporators are used for adjusting the discharge amount of ammonia gas, each ammonia water evaporator is provided with an ammonia supply pipeline, one of the ammonia supply pipelines extends into the tower body and is located below the first-stage grid, and the other ammonia supply pipeline extends into the tower body and is located below the second-stage grid. The other ammonia supply pipeline extends into the tower body and is positioned between the primary reactor and the secondary grating; the chimney is communicated with the smoke outlet; and the booster fan is arranged between the chimney and the smoke outlet.

Description

Technical Field

[0001] The invention belongs to the technical field of waste gas treatment, and in particular relates to an integrated series-connected SCR denitration system. Background Art

[0002] In order to protect the environment and achieve carbon emission reduction, the exhaust gas generated in the production process of the steel industry, petrochemical industry, glass industry, etc. needs to be denitrated before being discharged. The currently commonly used denitration process is SCR denitration (selective catalytic reduction) technology. This denitration process usually arranges 2 to 3 layers of denitration catalysts, and the denitration temperature is ≥250℃, but nitrogen oxides (NO X ) when the removal amount is large, the denitrification efficiency is high, and the operating temperature is low, the above denitrification process cannot meet the requirements. For example, the maximum amount of NOx produced by glass kilns and roller kilns can reach 3000-4000mg / Nm 3 , corresponding to NO x The emission index is 50-100mg / Nm 3 Therefore, the denitrification efficiency needs to reach 98.75%, and the maximum removal amount is 3950mg / Nm 3 The conventional 2 to 3-layer denitrification catalytic layout is difficult to meet the requirements; in addition, if the number of denitrification catalyst layout layers is directly increased and designed according to 5 to 6 layers, considering that the denitrification efficiency of the catalyst decreases step by step at each layer, if excessive ammonia injection is required to meet the emission standards, it will also cause an increase in ammonia escape. Summary of the invention

[0003] The embodiment of the present invention provides an integrated series SCR denitration system, which aims to solve the technical problems that the existing denitration process cannot achieve the treatment efficiency requirements when the exhaust gas volume is large, and directly increasing the number of denitration catalyst layers to increase the treatment efficiency will lead to excessive ammonia injection and increased ammonia escape.

[0004] To achieve the above object, the technical solution adopted by the present invention is: to provide an integrated series-connected SCR denitration system, comprising: The denitration assembly comprises a tower body, a primary grid, a primary reactor, a secondary grid, and a secondary reactor which are arranged in the tower body and arranged in sequence from bottom to top, wherein a smoke inlet is provided at the bottom of the tower body and a smoke outlet is provided at the top; an ammonia supply component, comprising an ammonia water tank and two ammonia water evaporators, both of which are connected to the ammonia water tank, and the ammonia water evaporators are used to adjust the emission of ammonia gas, and each of the ammonia water evaporators is provided with an ammonia supply pipeline, one of which extends into the tower body and is located below the primary grid, and the other of which extends into the tower body and is located between the primary reactor and the secondary grid; a chimney, connected to the smoke outlet; A booster fan is arranged between the chimney and the smoke outlet.

[0005] In a possible implementation, the ammonia evaporator includes: an evaporation box, having a liquid inlet communicated with the ammonia water tank and an air outlet communicated with the ammonia supply pipeline, wherein the air outlet is located at the top of the evaporation box; A heating pipe is arranged in the evaporation box; A ventilation grille is provided in the evaporation box and below the air outlet; A plurality of adjustment plates are arranged on the top of the ventilation grille; A driving mechanism, used for driving the plurality of adjustment plates to unfold or fold; The plurality of adjustment plates are stacked from top to bottom, and the driving mechanism is used to slide and adjust the adjustment plates so that the plurality of adjustment plates cover different areas on the top of the air-permeable grille, thereby adjusting the flow of ammonia.

[0006] In a possible implementation, a condensation pit is provided at the bottom of the adjustment plate, and the condensation pit is semicircular.

[0007] In a possible implementation, the driving mechanism is a cylinder, the piston rod of the cylinder is fixedly connected to the uppermost adjustment plate, and is used to drive the adjustment plate to reciprocate along the first straight path; Among the two adjacent adjustment plates, the top of the adjustment plate located at the bottom is provided with two blocks, and the bottom of the adjustment plate located at the top is provided with a slider located between the two blocks. When the slider contacts one of the blocks, it is used to drive the adjustment plate located at the bottom to unfold and move, and when the slider contacts the other block, it is used to drive the adjustment plate located at the bottom to fold and move.

[0008] In a possible implementation, two opposite inner walls of the evaporator are provided with a plurality of slide grooves, the slide grooves extend along the first straight path, the plurality of slide grooves correspond one-to-one to the plurality of adjustment plates, and two slide grooves located at the same height slideably cooperate with the opposite side walls of the same adjustment plate.

[0009] In a possible implementation, two flue gas monitors are further provided in the tower body, one of which is used to detect the flue gas at the outlet side of the first reactor, and the other flue gas monitor is used to detect the flue gas at the outlet side of the second reactor, and both of the flue gas monitors are communicatively connected to the driving mechanism.

[0010] In a possible implementation, the chimney is also provided with a smoke monitor, and the chimney is also provided with a sealing plate and a return pipe, the sealing plate is used to close the chimney, the return pipe is connected with the smoke inlet, and the return pipe is provided with an electric control valve, and the electric control valve is communicatively connected with the smoke monitor on the chimney; When the flue gas monitor on the chimney detects that the emission of nitrogen oxides in the flue gas exceeds a preset value, the sealing plate is closed and the electric control valve is opened to allow the flue gas in the chimney to flow back to the smoke inlet.

[0011] In a possible implementation, the primary grid and the secondary grid both include: An upper grid plate is fixedly connected to the inner wall of the tower body; A first plug rod is fixedly connected to the bottom of the upper grid plate; A spring, the top end of which is fixedly connected to the upper grid plate; A lower grid plate, fixedly connected to the bottom end of the spring; A second plug rod is fixedly connected to the top of the lower grid plate; Wherein, the first plug rod and the second plug rod are both arranged at an angle, and the first plug rod and the second plug rod form an X-shaped current sharing structure.

[0012] In a possible implementation, the primary grid and the secondary grid are both baffle grids.

[0013] In a possible implementation, the primary reactor and the secondary reactor both include: A plurality of support frames are arranged in the tower body at intervals along the vertical direction, one of which is fixed to the inner wall of the tower body, and the other support frames are slidably matched with the tower body along the vertical direction, and denitration catalysts are arranged on the support frames; The lifting cylinder is arranged between two adjacent support frames. In the two adjacent support frames, the cylinder body of the lifting cylinder is fixedly connected to one of the support frames, and the piston rod of the lifting cylinder is fixedly connected to the other support frame.

[0014] Compared with the prior art, the scheme shown in the embodiment of the present application is that the flue gas after desulfurization and dust removal enters the tower body through the smoke inlet. At this time, the ammonia tank provides ammonia water to the two ammonia evaporators. The ammonia water evaporates in the two ammonia evaporators to form ammonia gas, which is passed into the tower body. During the process of the flue gas flowing from bottom to top in the tower body, it first merges with the ammonia gas at the bottom of the first-level grid and then passes through the first-level grid to make the flue gas and ammonia gas mix evenly, and then enters the first-level reactor for denitrification reaction. After the reaction is completed, it merges with the ammonia gas again at the bottom of the second-level grid, and passes through the second-level grid to mix the treated flue gas once with the ammonia gas here evenly, and then enters the second-level reactor for denitrification reaction. The flue gas finally flows out from the smoke outlet and is discharged to the outside through the booster fan and chimney. The integrated series SCR denitrification system of the present invention effectively realizes the integration of the denitrification reaction by arranging the two-stage reactors in series in the same tower body, solving the problem of NO inlet in some kiln industries. x High concentration (≥3000-4000mg / Nm 3 ) and NO x Strict emission requirements (≤50-100mg / Nm 3 ) problem, and effectively solve the floor space, which is conducive to promotion; two ammonia evaporators pass ammonia into the tower body, and the flow of ammonia can be adjusted to ensure the denitrification efficiency of the flue gas while minimizing ammonia escape. Before the flue gas is passed into the tower body, the specific NO in the flue gas can be measured in advance. x The concentration can be adjusted accordingly to adjust the ammonia discharge volume of the two ammonia evaporators, making it more flexible to use and meeting different production needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the main structure of an integrated series SCR denitration system provided by an embodiment of the present invention; Figure 2 A schematic cross-sectional structure diagram of an ammonia water evaporator used in an embodiment of the present invention; Figure 3 A schematic diagram of an unfolded state of an adjustment plate used in an embodiment of the present invention; Figure 4 A schematic diagram of the three-dimensional structure of an adjustment plate used in an embodiment of the present invention; Figure 5 This is a schematic structural diagram of a primary grid used in another embodiment of the present invention.

[0016] Description of reference numerals: 10-denitrification assembly; 11-tower body; 111-smoke inlet; 112-smoke outlet; 12a-first grid; 12b-second grid; 121-upper grid plate; 122-first plug rod; 123-spring; 124-lower grid plate; 125-second plug rod; 13a-first reactor; 13b-second reactor; 131-support frame; 132-lifting cylinder; 20-ammonia supply assembly; 21-ammonia tank; 22-ammonia evaporator; 221-evaporation box; 222-heating tube; 223-air-permeable grille; 224-adjusting plate; 225-driving mechanism; 226-condensation pit; 227-block; 228-slider; 229-slide; 23-ammonia supply pipeline; 30-boosting fan; 40-chimney; 41-sealing plate; 42-return pipe; 43-electrically controlled valve; 50-Smoke monitor. DETAILED DESCRIPTION

[0017] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0018] In the claims, description and the above-mentioned drawings of the present invention, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" etc. are for distinguishing different objects rather than for describing a specific order.

[0019] Unless otherwise expressly defined, the directional words in the claims, specification and the above-mentioned drawings of the present invention, such as the use of terms such as "upper", "lower", "top", "bottom", "front", "back", "inside", "outside", "center", "lateral", "longitudinal", "horizontal", "vertical", "left", "right", "clockwise", "counterclockwise", "high", "low", etc., indicating directions or positional relationships are based on the directions and positional relationships shown in the 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 direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the specific protection scope of the present invention.

[0020] In the claims, specification and the above drawings of the present invention, unless otherwise clearly defined, if the term "fixed connection" or "fixed connection" is used, it should be understood in a broad sense, that is, any connection method without a displacement relationship and relative rotation relationship between the two, that is to say, including non-detachable fixed connection, detachable fixed connection, integrated connection and fixed connection through other devices or elements.

[0021] In the claims, description and drawings of the present invention, if the terms "include", "have" and their variations are used, they are intended to mean "including but not limited to".

[0022] Please also read Figures 1 to 5 The integrated series SCR denitration system provided by the present invention is now described. The integrated series SCR denitration system includes a denitration component 10, an ammonia supply component 20, a chimney 40 and a booster fan 30. The denitration component 10 includes a tower body 11, a primary grid 12a, a primary reactor 13a, a secondary grid 12b, and a secondary reactor 13b arranged in sequence from bottom to top in the tower body 11. The bottom of the tower body 11 is provided with a smoke inlet 111, and the top is provided with a smoke outlet 112; the ammonia supply component 20 includes an ammonia water tank 21 and two ammonia water evaporators 22. Both ammonia water evaporators 22 are connected to the ammonia water tank 21. The ammonia water evaporators 22 are used to adjust the emission of ammonia gas. Each ammonia water evaporator 22 is provided with an ammonia supply pipeline 23, one of which extends into the tower body 11 and is located below the primary grid 12a, and the other ammonia supply pipeline 23 extends into the tower body 11 and is located between the primary reactor 13a and the secondary grid 12b; the chimney 40 is connected to the smoke outlet 112; the booster fan 30 is arranged between the chimney 40 and the smoke outlet 112.

[0023] Compared with the prior art, the integrated series SCR denitration system provided in this embodiment is that the flue gas after desulfurization and dust removal enters the tower body 11 through the smoke inlet 111, and at this time, the ammonia tank 21 provides ammonia water to the two ammonia water evaporators 22, and the ammonia water is evaporated in the two ammonia water evaporators 22 to form ammonia gas, which is introduced into the tower body 11. In the process of the flue gas flowing from bottom to top in the tower body 11, it first merges with the ammonia gas at the bottom of the first-level grid 12a, and then passes through the first-level grid 12a to make the flue gas and the ammonia gas evenly mixed, and then enters the first-level reactor 13a for denitration reaction. After the reaction is completed, it merges with the ammonia gas again at the bottom of the second-level grid 12b, and passes through the second-level grid 12b to mix the treated flue gas once with the ammonia gas here evenly, and then enters the second-level reactor 13b for denitration reaction. The flue gas finally flows out from the smoke outlet 112 and is discharged to the outside through the booster fan 30 and the chimney 40. The integrated series SCR denitration system of the present invention effectively realizes the integration of denitration reaction by arranging two-stage reactors in series in the same tower body 11, thus solving the problem of NO inlet in some kiln industries. x High concentration (≥3000-4000mg / Nm 3 ) and NO x Strict emission requirements (≤50-100mg / Nm 3) problem, and effectively solve the floor space, which is conducive to promotion; two ammonia evaporators introduce ammonia into the tower body 11, and the flow rate of ammonia can be adjusted, so as to ensure the denitration efficiency of the flue gas while minimizing ammonia escape. Before the flue gas is introduced into the tower body 11, the specific NO in the flue gas can be measured in advance. x The concentration can be adjusted accordingly to adjust the ammonia discharge volume of the two ammonia evaporators, making it more flexible to use and meeting different production needs.

[0024] In some embodiments, a specific implementation of the ammonia evaporator 22 can be as follows: Figure 2 See the structure shown. Figure 2 The ammonia evaporator 22 includes an evaporation box 221, a heating pipe 222, a ventilation grille 223, a plurality of adjustment plates 224 and a driving mechanism 225. The evaporation box 221 has a liquid inlet connected to the ammonia tank 21 and an air outlet connected to the ammonia supply pipeline 23, and the air outlet is located at the top of the evaporation box 221; the heating pipe 222 is arranged in the evaporation box 221; the ventilation grille 223 is arranged in the evaporation box 221 and is located below the air outlet; the plurality of adjustment plates 224 are arranged on the top of the ventilation grille 223; the driving mechanism 225 is used to drive the plurality of adjustment plates 224 to unfold or fold; The plurality of adjustment plates 224 are stacked from top to bottom, and the driving mechanism 225 is used to slide and adjust the adjustment plates 224 so that the plurality of adjustment plates 224 cover different areas on the top of the air-permeable grille 223, thereby adjusting the flow of ammonia.

[0025] After the ammonia water enters the evaporation box 221, it is ensured that the ammonia water submerges the heating tube 222. The heating tube 222 heats the ammonia water to generate ammonia gas which flows toward the air outlet. The ammonia gas can be dispersed through the air-permeable grille 223 and then enters the tower body 11. Since different ammonia water evaporators 22 may correspond to different ammonia gas flow rates entering the tower body 11, the driving mechanism 225 is used to adjust the stacking degree of the multiple adjustment plates 224 to cover air-permeable grilles 223 of different areas, thereby achieving the adjustment of the ammonia gas flow rate.

[0026] Specifically, the heating tube 222 may be heated electrically, or high-temperature steam may be introduced into the heating tube 222 for heating.

[0027] It should be noted that, in order to ensure the heating efficiency of the ammonia water, the heating tube 222 in the evaporation box 221 can be in various shapes such as rectangular, grid, S-shaped, etc. Figure 2 The heating tube 222 shown in the figure includes a liquid inlet pipe located at the bottom, a liquid outlet pipe located at the top, a connecting pipe connected between the liquid inlet pipe and the liquid outlet pipe, and a branch pipe arranged in the middle of the connecting pipe. High-temperature water vapor enters from the liquid inlet pipe, passes through the connecting pipe and the branch pipe in sequence, and then flows out from the liquid outlet pipe, thereby heating the ammonia water with high heating efficiency.

[0028] In some embodiments, an improved implementation of the above-mentioned adjustment plate 224 can be adopted as follows Figures 2 to 3 See the structure shown. Figures 2 to 3 The bottom of the adjustment plate 224 is provided with a condensation pit 226, which is semicircular. Since the adjustment plate 224 covers a certain area of ​​the air-permeable grille 223, the ammonia gas floating upward from the bottom of the adjustment plate 224 will be collected on the bottom surface of the adjustment plate 224 after contacting the adjustment plate 224. By providing the condensation pit 226, the ammonia gas here can be quickly condensed and dripped to the bottom of the evaporation box 221 again, so that it can be used for evaporation again.

[0029] In some embodiments, a specific implementation of the driving mechanism 225 can be as follows: Figures 2 to 4 See the structure shown. Figures 2 to 4 The driving mechanism 225 is a cylinder, the piston rod of which is fixedly connected to the uppermost adjustment plate 224, and is used to drive the adjustment plate 224 to reciprocate along the first straight path; Of the two adjacent adjustment plates 224, the top of the lower adjustment plate 224 is provided with two blocks 227, and the bottom of the upper adjustment plate 224 is provided with a slider 228 located between the two blocks 227. When the slider 228 contacts one of the blocks 227, it is used to drive the lower adjustment plate 224 to unfold and move, and when the slider 228 contacts the other block 227, it is used to drive the lower adjustment plate 224 to fold and move.

[0030] When multiple adjustment plates 224 are stacked together, they are all located on the first side inside the evaporator box 221, and the cylinder is fixed on the first side outside the evaporator box 221. When the piston rod of the cylinder is extended, it drives the top adjustment plate 224 to move toward the second side, and the second side is the opposite side of the first side. During the movement of the top adjustment plate 224, the slider 228 thereon slides between the two blocks 227 at the top of the adjustment plate 224 below it until it contacts the block 227 close to the second side, and then drives the adjustment plate 224 below it to move toward the second side. Different numbers of adjustment plates 224 can be unfolded through the above steps, and the piston rod of the cylinder can be retracted when folding.

[0031] It should be noted that the above-mentioned “unfolding movement” refers to movement toward the second side, and the “folding movement” refers to movement toward the first side.

[0032] In this embodiment, the unfolding and folding of multiple adjustment plates 224 can be controlled by one cylinder. Compared with each adjustment plate 224 being controlled by one cylinder, this structure has lower costs and can ensure that there is no gap between the multiple adjustment plates 224 after unfolding, thereby more accurately controlling the flow rate of ammonia.

[0033] In some embodiments, a specific installation method of the adjustment plate 224 can be as follows: Figure 2 See the structure shown. Figure 2 , a plurality of slide grooves 229 are provided on the two opposite inner side walls of the evaporator box 221, and the slide grooves 229 extend along the first straight path, and the plurality of slide grooves 229 correspond to the plurality of adjustment plates 224 one by one, and two slide grooves 229 located at the same height slide with the opposite side walls of the same adjustment plate 224. Each adjustment plate 224 corresponds to a slide groove 229, and when the driving mechanism 225 drives the adjustment plate 224 to move, the adjustment plate 224 slides in the slide groove 229, thereby improving the stability of the adjustment plate 224 during the movement process.

[0034] In some embodiments, an improved implementation of the tower body 11 can be as follows: Figure 1 See the structure shown. Figure 1 Two flue gas monitors 50 are also provided in the tower body 11, one of which is used to detect the flue gas at the outlet side of the primary reactor 13a, and the other is used to detect the flue gas at the outlet side of the secondary reactor 13b. Both flue gas monitors 50 are connected to the drive mechanism 225 for communication. By providing a flue gas monitor 50 at the outlet side of the primary reactor 13a and the secondary reactor 13b, NO in the flue gas can be detected after the flue gas has undergone a denitration treatment. x concentration, thus according to the real-time NO x The concentration control driving mechanism 225 adjusts the expansion degree of the multiple adjustment plates 224 to change the ammonia flow rate, and can adjust the ammonia amount in real time during the treatment of the flue gas, thereby meeting the flue gas treatment efficiency while avoiding ammonia escape.

[0035] In some embodiments, an improved embodiment of the chimney 40 can be adopted as follows Figure 1 See the structure shown. Figure 1 The chimney 40 is also provided with a smoke monitor 50, a sealing plate 41 and a return pipe 42, the sealing plate 41 is used to close the chimney 40, the return pipe 42 is connected to the smoke inlet 111, and an electric control valve 43 is provided on the return pipe 42, and the electric control valve 43 is communicated with the smoke monitor 50 on the chimney 40; When the flue gas monitor 50 on the chimney 40 detects that the emission of nitrogen oxides in the flue gas exceeds a preset value, the sealing plate 41 is closed and the electric control valve 43 is opened to allow the flue gas in the chimney 40 to flow back to the smoke inlet 111 .

[0036] When the flue gas enters the chimney 40 after the secondary denitrification reaction, the flue gas is tested for the last time in the chimney 40. If the test fails to meet the standard, the sealing plate 41 is closed to block the chimney 40 outlet. At this time, the flue gas flows back to the smoke inlet 111 through the reflux pipe 42 for another denitrification treatment. The flue gas entering the tower body 11 through the reflux pipe 42 can close one of the ammonia evaporators 22 to avoid excessive ammonia.

[0037] It is easy to understand that in order to provide power for the smoke to enter the smoke inlet 111 from the return duct 42, a fan can also be set on the return duct 42, and the electric control valve 43 is linked to the fan. The fan is turned on when the electric control valve 43 is opened, and the fan is turned off when the electric control valve 43 is closed.

[0038] It should be noted that the sealing plate 41 is also controlled by an electric structure, similar to a gate valve.

[0039] In some embodiments, a specific implementation of the primary grid 12a and the secondary grid 12b can be as follows: Figure 5 See the structure shown. Figure 5 The first-stage grid 12a and the second-stage grid 12b each include an upper grid plate 121, a first plug rod 122, a spring 123, a lower grid plate 124 and a second plug rod 125. The upper grid plate 121 is fixed to the inner wall of the tower body 11; the first plug rod 122 is fixed to the bottom of the upper grid plate 121; the top of the spring 123 is fixed to the upper grid plate 121; the lower grid plate 124 is fixed to the bottom of the spring 123; the second plug rod 125 is fixed to the top of the lower grid plate 124; The first plug rod 122 and the second plug rod 125 are both arranged at an angle, and the first plug rod 122 and the second plug rod 125 form an X-shaped current sharing structure.

[0040] After the flue gas enters the tower body 11, the booster fan 30 sucks air, causing the flue gas to flow upward in the tower body 11. During the flow, the flue gas first passes through the lower grid plate 124. Since the spring 123 connected between the lower grid plate 124 and the upper grid plate 121 causes the lower grid plate 124 to swing up and down, the combination shape between the crossed first plug rod 122 and the second plug rod 125 will also change, thereby improving the flow equalization effect and increasing the mixing uniformity of ammonia and flue gas.

[0041] As a modified embodiment of the primary grid 12a and the secondary grid 12b, see Figure 1 The primary grid 12a and the secondary grid 12b are both baffle grids, which are an existing structure in the art and will not be described in detail here.

[0042] In some embodiments, a specific implementation of the primary reactor 13a and the secondary reactor 13b can be as follows: Figure 1 See the structure shown. Figure 1 The primary reactor 13a and the secondary reactor 13b each include a plurality of support frames 131 and a lifting cylinder 132. The plurality of support frames 131 are arranged in the tower body 11 at intervals along the vertical direction, one of which is fixed to the inner wall of the tower body 11, and the other support frames 131 are slidably matched with the tower body 11 along the vertical direction, and denitration catalysts are arranged on the support frames 131; the lifting cylinder 132 is arranged between two adjacent support frames 131, and in the two adjacent support frames 131, the cylinder body of the lifting cylinder 132 is fixed to one of the support frames 131, and the piston rod of the lifting cylinder 132 is fixed to the other support frame 131. The distance between the two adjacent support frames 131 can be adjusted by the telescopic cylinder, thereby changing the overall height occupied by the reactor in the tower body 11, and tower bodies 11 of different heights can be used to ensure the denitration efficiency of flue gas.

[0043] It should be noted that, in order to stabilize the up and down sliding process of the support frame 131 , a sliding groove 229 corresponding to the support frame 131 may be further provided on the inner wall of the tower body 11 .

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An integrated series SCR denitration system, characterized in that: include: The denitration assembly comprises a tower body, a primary grid, a primary reactor, a secondary grid, and a secondary reactor which are arranged in the tower body and arranged in sequence from bottom to top, wherein a smoke inlet is provided at the bottom of the tower body and a smoke outlet is provided at the top; an ammonia supply component, comprising an ammonia water tank and two ammonia water evaporators, both of which are connected to the ammonia water tank, and the ammonia water evaporators are used to adjust the emission of ammonia gas, and each of the ammonia water evaporators is provided with an ammonia supply pipeline, one of which extends into the tower body and is located below the primary grid, and the other of which extends into the tower body and is located between the primary reactor and the secondary grid; a chimney, connected to the smoke outlet; A booster fan is arranged between the chimney and the smoke outlet.

2. The integrated series SCR denitration system according to claim 1, characterized in that: The ammonia evaporator comprises: an evaporation box, having a liquid inlet communicated with the ammonia water tank and an air outlet communicated with the ammonia supply pipeline, wherein the air outlet is located at the top of the evaporation box; A heating pipe is arranged in the evaporation box; A ventilation grille is provided in the evaporation box and below the air outlet; A plurality of adjustment plates are arranged on the top of the ventilation grille; A driving mechanism, used for driving the plurality of adjustment plates to unfold or fold; The plurality of adjustment plates are stacked from top to bottom, and the driving mechanism is used to slide and adjust the adjustment plates so that the plurality of adjustment plates cover different areas on the top of the air-permeable grille, thereby adjusting the flow of ammonia.

3. The integrated series SCR denitration system according to claim 2, characterized in that: A condensation pit is provided at the bottom of the adjustment plate, and the condensation pit is semicircular.

4. The integrated series SCR denitration system according to claim 2, characterized in that: The driving mechanism is a cylinder, the piston rod of which is fixedly connected to the uppermost adjusting plate, and is used to drive the adjusting plate to reciprocate along the first straight path; Among the two adjacent adjustment plates, the top of the adjustment plate located at the bottom is provided with two blocks, and the bottom of the adjustment plate located at the top is provided with a slider located between the two blocks. When the slider contacts one of the blocks, it is used to drive the adjustment plate located at the bottom to unfold and move, and when the slider contacts the other block, it is used to drive the adjustment plate located at the bottom to fold and move.

5. The integrated series SCR denitration system according to claim 4, characterized in that: Two opposite inner side walls of the evaporator box are each provided with a plurality of slide grooves, the slide grooves extending along the first straight path, the plurality of slide grooves corresponding one to one with the plurality of adjustment plates, and two slide grooves at the same height slidingly cooperate with the opposite side walls of the same adjustment plate.

6. The integrated series SCR denitration system according to claim 2 or 4, characterized in that: Two flue gas monitors are also provided in the tower body, one of which is used to detect the flue gas at the outlet side of the primary reactor, and the other is used to detect the flue gas at the outlet side of the secondary reactor. Both flue gas monitors are communicatively connected to the driving mechanism.

7. The integrated series SCR denitration system according to claim 6, characterized in that: The chimney is also provided with a smoke monitor, a sealing plate and a return pipe, the sealing plate is used to close the chimney, the return pipe is connected with the smoke inlet, the return pipe is provided with an electric control valve, and the electric control valve is communicatively connected with the smoke monitor on the chimney; When the flue gas monitor on the chimney detects that the emission of nitrogen oxides in the flue gas exceeds a preset value, the sealing plate is closed and the electric control valve is opened to allow the flue gas in the chimney to flow back to the smoke inlet.

8. The integrated series SCR denitration system according to claim 1, characterized in that: The primary grid and the secondary grid both include: An upper grid plate is fixedly connected to the inner wall of the tower body; A first plug rod is fixedly connected to the bottom of the upper grid plate; A spring, the top end of which is fixedly connected to the upper grid plate; A lower grid plate, fixedly connected to the bottom end of the spring; A second plug rod is fixedly connected to the top of the lower grid plate; Wherein, the first plug rod and the second plug rod are both arranged at an angle, and the first plug rod and the second plug rod form an X-shaped current sharing structure.

9. The integrated series SCR denitration system according to claim 1, characterized in that: The primary grid and the secondary grid are both baffle grids.

10. The integrated series SCR denitration system according to claim 1, characterized in that: The primary reactor and the secondary reactor both include: A plurality of support frames are arranged in the tower body at intervals along the vertical direction, one of which is fixed to the inner wall of the tower body, and the other support frames are slidably matched with the tower body along the vertical direction, and denitration catalysts are arranged on the support frames; The lifting cylinder is arranged between two adjacent support frames. In the two adjacent support frames, the cylinder body of the lifting cylinder is fixedly connected to one of the support frames, and the piston rod of the lifting cylinder is fixedly connected to the other support frame.

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