Fixed bed reactor for denitration of nitric acid tail gas

Abstract

The utility model discloses a fixed bed reactor for nitric acid tail gas denitration, which comprises a reactor cylinder and a reaction zone arranged on the reactor cylinder, the front side and the rear side of the inner cavity of the reaction zone are fixedly connected with fixing plates, and the tops of the two fixing plates are provided with the same drainage device. A reaction unit is arranged between the two fixed plates, and the reaction unit comprises two annular catalyst baskets and a top sealing plate, the two annular catalyst baskets are arranged in parallel at an interval and are filled with catalysts, and the top sealing plate is arranged at the tops of the two annular catalyst baskets. After being conveyed into the inner cavity of the reactor barrel, the nitric acid tail gas can be guided into the plurality of gas inlet channels, so that the nitric acid tail gas quickly reacts with a catalyst in the reaction area, the reacted gas is discharged from the plurality of gas outlet channels, and the reaction efficiency is favorably improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to chemical equipment technical field especially relates to a fixed bed reactor for nitric acid tail gas denitration. BACKGROUND

[0002] The radial fixed bed reactor device size is smaller, the bed layer flow area is big, the catalyst or adsorbent bed layer thickness is smaller, the bed layer pressure drop is small, and the operating cost is low. The catalyst basket of the traditional radial reactor is mostly circular ring shape, its structure is complex, and the processing difficulty is big, if for nitric acid tail gas denitration, the catalyst bed layer thickness is big, and the catalyst is easy to turbulence and pulverization when the gas flow passes, and even appears the ditch flow, short circuit.

[0003] Refer to the prior art of the Chinese patent with the publication number CN211612258U discloses a kind of fixed bed nitric acid tail gas denitration reactor, it is related to chemical equipment technical field, it solves the problems that the catalyst bed layer thickness of existing denitration reactor is big, catalyst is easy to turbulence and pulverization when the gas flow passes, and even appears the ditch flow, short circuit.

[0004] The fixed bed nitric acid tail gas denitration reactor, the reaction unit includes two annular catalyst baskets and top sealing plate, the two annular catalyst baskets of reaction unit are arranged in parallel with a spacing, the top sealing plate is arranged at the top of the two annular catalyst baskets, the bottom of the annular catalyst basket of adjacent two reaction units is fixedly connected by bottom sealing plate, the top sealing plate can block the top channel of the two annular catalyst baskets, and the bottom sealing plate can block the bottom channel of the annular catalyst basket of adjacent two reaction units, since the annular catalyst basket is a gas-permeable structure, therefore, when the number of reaction units is N, N-1 gas inlet channels and N gas outlet channels can be formed in the reaction zone; when the nitric acid tail gas enters the reaction zone through the top inlet of the reactor cylinder, the nitric acid tail gas can only enter the N-1 gas inlet channels first, then pass through the annular catalyst baskets of the N reaction units to enter the N gas outlet channels respectively, and finally be discharged from the bottom outlet of the reactor cylinder through the N gas outlet channels, thereby realizing the denitration reaction of the nitric acid tail gas. Compared with the radial fixed bed reactor in the prior art, the reactor has the advantages of high reactor space utilization and large gas flow area during actual use, and can reduce the catalyst bed layer thickness and the gas flow velocity, so that the catalyst does not turbulence, the gas flow does not short circuit, and the use effect is good, which is convenient for popularization and application. However, the above-mentioned fixed bed reactor for nitric acid tail gas denitration still has some shortcomings, such as: the nitric acid tail gas accumulates at the top of the inner cavity of the reactor cylinder after being transported into the reactor cylinder, which affects the reaction efficiency, and the existing fixed bed reactor for nitric acid tail gas denitration cannot switch the installation mode according to the predetermined installation position, which has poor applicability. UTILITY MODEL CONTENTS

[0005] One of the purposes of the utility model discloses the following technical scheme is realized:

[0006] A fixed bed reactor for removing nitrogen oxides from tail gas of nitric acid, comprising a reactor cylinder and a reaction zone arranged on the reactor cylinder, wherein the inner cavity of the reaction zone is provided with a fixed plate, the top of the fixed plate is provided with a flow inducer, the bottom of the fixed plate is provided with a reaction unit, the reaction unit comprises two annular catalyst baskets arranged in parallel at intervals and filled with catalyst and a top sealing plate arranged on the top of the two annular catalyst baskets, a plurality of gas inlet channels and gas outlet channels are arranged at equal intervals between the annular catalyst baskets and the catalyst of the two adjacent reaction units, the bottoms of the annular catalyst baskets of the two adjacent reaction units are fixedly connected through bottom sealing plates, the annular catalyst baskets are perpendicular to the fixed plate, the annular catalyst baskets are gas-permeable structures, and the outer side of the reactor cylinder is provided with a mounting mechanism.

[0007] Further, the mounting mechanism comprises two annular plates distributed above and below, and the two annular plates are sleeved and fixed on the outer wall of the reactor cylinder, the bottom of the reactor cylinder is provided with a mounting plate, the top of the mounting plate is fixedly connected with support plates on the left and right sides, the top of each of the two support plates is provided with a receiving groove, the inner cavity of the receiving groove is slidably connected with a connecting plate matched therewith, the top of each of the two connecting plates is fixedly connected with a first load-bearing plate, a first fixing hole is formed in the side of the first load-bearing plate close to the reactor cylinder, a first telescopic rod matched with the first fixing hole is inserted into the inner cavity of the first fixing hole, a plurality of first blind holes are formed in the outer wall of the first telescopic rod in an annular array, a first T-shaped rod matched with the first blind hole is slidably connected to the top of each of the two first load-bearing plates, the bottom end of each of the two first T-shaped rods is inserted into the inner cavity of the adjacent first blind hole, a first spring is sleeved on the outer wall of each of the two first T-shaped rods, and the two ends of the first spring are fixedly connected with the first T-shaped rod and the first load-bearing plate.

[0008] Further, a second blind hole is formed in the right side of the connecting plate, a second T-shaped rod matched with the second blind hole is slidably connected to the outer wall of the support plate, the longest end of the second T-shaped rod is inserted into the inner cavity of the second blind hole at the top, a second spring is sleeved on the outer wall of the second T-shaped rod, and the two ends of the second spring are fixedly connected with the support plate and the second T-shaped rod.

[0009] Further, the support plate is attached with a second bearing plate close to one side of the reactor cylinder, and a second fixing hole is formed close to the other side of the second bearing plate at the top, the outer wall of the annular plate at the bottom is fixedly connected with a second telescopic rod matched with the second fixing hole, and the other end of the second telescopic rod is inserted into the inner cavity of the second fixing hole, a plurality of third blind holes are formed in the outer wall of the second telescopic rod in a ring array, a third T-shaped rod matched with the third blind hole is slidably connected to the top of the second bearing plate, and the longest end of the third T-shaped rod is inserted into the inner cavity of the adjacent third blind hole, a third spring is sleeved on the outer wall of the third T-shaped rod, and the two ends of the third spring are fixedly connected with the third T-shaped rod and the second bearing plate respectively, a first threaded hole is formed close to the bottom of the second bearing plate, and a first T-shaped bolt matched with the first threaded hole is threadedly connected to the support plate, and the threaded end of the first T-shaped bolt is threadedly connected in the inner cavity of the first threaded hole.

[0010] Further, a second threaded hole is formed in the left side of the second bearing plate, and a vertical plate is fixedly connected to the left side of the mounting plate corresponding to the second threaded hole, and a second T-shaped bolt matched with the second threaded hole is threadedly connected to the vertical plate.

[0011] Further, mounting holes are formed at the four corners of the mounting plate.

[0012] Compared with the prior art, the utility model has the advantages that:

[0013] 1. By arranging the flow inducer, the nitric acid tail gas can be introduced into the plurality of gas inlet channels after being delivered into the inner cavity of the reactor cylinder, so that the nitric acid tail gas can be quickly reacted with the catalyst in the reaction zone, and the reacted gas can be discharged through the plurality of gas outlet channels, thereby improving the reaction efficiency.

[0014] 2. By arranging the support plate, the storage groove, the second T-shaped rod, the second spring, the second blind hole, the connecting plate, the first bearing plate, the first telescopic rod, the second bearing plate, the second telescopic rod, the first T-shaped bolt and the first threaded hole, the support plate and the second bearing plate are threadedly connected, so that the first bearing plate and the second bearing plate are cooperated to vertically support the reactor cylinder, thereby improving the stability of the fixed bed reactor during operation, and facilitating the bolted fixation of the reactor through the mounting plate. By arranging the first blind hole, the first T-shaped rod, the first spring, the third blind hole, the third T-shaped rod and the third spring, the first T-shaped rod and the third T-shaped rod can be pulled upward and extracted from the inner cavities of the first blind hole and the second blind hole, so that the reactor can be easily disassembled, thereby improving the convenience of the later maintenance and repair of the staff.

[0015] 3. By unscrewing the first T-shaped bolt from the first threaded hole, then the rotatable mounting plate is rotated counterclockwise by ninety degrees, then the two second load-bearing plates are rotated synchronously with the first load-bearing plate, and the second T-shaped rod is pulled out from the adjacent second blind hole cavity, and the mounting plate is pushed close to the second load-bearing plate, so that the second T-shaped bolt can be screwed into the second threaded hole, thereby supporting the reactor cylinder, and facilitating the lateral installation of the mounting plate, improving the flexibility and applicability of the reactor installation. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a front view structural schematic diagram of the first embodiment;

[0017] Figure 2 It is a three-dimensional structural schematic diagram of the first embodiment of the flow diverter;

[0018] Figure 3 It is a schematic diagram of the annular catalyst basket structure of the first embodiment;

[0019] Figure 4 It is a three-dimensional structural schematic diagram of the first installation method of the second embodiment;

[0020] Figure 5 It is a right view three-dimensional structural schematic diagram of the first installation method of the second embodiment;

[0021] Figure 6 It is a sectional view structural schematic diagram of the support plate of the second embodiment;

[0022] Figure 7 It is a three-dimensional split structural schematic diagram of the first load-bearing plate of the second embodiment;

[0023] Figure 8 It is a three-dimensional split structural schematic diagram of the second load-bearing plate of the second embodiment;

[0024] Figure 9 It is a three-dimensional structural schematic diagram of the second installation method of the second embodiment.

[0025] Figure: 1, reactor cylinder; 2, the first load-bearing plate; 3, annular catalyst basket; 4, catalyst; 5, top cover plate; 6, bottom cover plate; 7, fixed plate; 8, gas inlet channel; 9, gas outlet channel; 10, flow guide; 11, annular plate; 12, first telescopic rod; 13, connecting plate; 14, support plate; 15, storage groove; 16, second T-shaped rod; 17, second blind hole; 18, second spring; 19, first fixed hole; 20, first blind hole; 21, first T-shaped rod; 22, first spring; 23, mounting plate; 24, mounting hole; 25, second telescopic rod; 26, second load-bearing plate; 27, first threaded hole; 28, first T-shaped bolt; 29, second fixed hole; 30, third blind hole; 31, third T-shaped rod; 32, third spring; 33, second threaded hole; 34, vertical plate; 35, second T-shaped bolt. DETAILED DESCRIPTION

[0026] The utility model provides the following technical schemes:

[0027] Example 1, please refer to Figures 1 to 3 :

[0028] A fixed bed reactor for nitric acid tail gas denitration, including reactor cylinder 1 and the reaction zone of setting on the reactor cylinder 1, the inner chamber of reaction zone is provided with fixed plate 7, and the top of fixed plate 7 is provided with flow guide 10, the bottom of fixed plate 7 is equipped with reaction unit, and reaction unit includes two annular catalyst baskets 3 that are parallelly arranged at intervals and are filled with catalyst 4 and top cover plate 5 that is arranged at the top of two annular catalyst baskets 3, and a plurality of gas inlet channels 8 and gas outlet channels 9 are arranged at intervals between the annular catalyst baskets 3 and catalyst 4 of adjacent two reaction units, the bottom of the annular catalyst basket 3 of adjacent two reaction units is fixedly connected through bottom cover plate 6, the annular catalyst basket 3 is perpendicular to fixed plate 7, and the annular catalyst basket 3 is a gas-permeable structure.

[0029] Working principle: when the utility model is in use, the first support net rack and the second support net rack are parallelly arranged on the inner wall of reactor cylinder 1, the first support net rack and the second support net rack are connected through vertical support rods, the nitric acid reaction zone is fixedly installed on the first support net rack, the second support net rack and the vertical support rod play the role of reinforcing the stable structure of the first support net rack, the strength and rigidity of the support frame are improved, the firmness of the installation of the reaction zone is ensured, after nitric acid tail gas is transported into the inner chamber of reactor cylinder 1, can be guided into a plurality of gas inlet channels 8 through the flow guide of flow guide 10, and through the setting of the gas permeable hole on the hole plate of annular catalyst basket 3, nitric acid tail gas can flow in adjacent catalyst 4 and realize denitration reaction, and the gas after reaction is discharged from a plurality of gas outlet channels 9.

[0030] Example 2, please refer to Figures 4 to 9 :

[0031] The outer side of the reactor cylinder 1 is provided with a mounting mechanism, the mounting mechanism comprises two annular plates 11 distributed above and below, and both of the two annular plates 11 are sleeved and fixed on the outer wall of the reactor cylinder 1. The bottom of the reactor cylinder 1 is provided with a mounting plate 23, mounting holes 24 are formed at the four corners of the mounting plate 23, support plates 14 are fixedly connected to the top of the mounting plate 23, receiving grooves 15 are formed in the top of the two support plates 14, and connecting plates 13 matched with the receiving grooves 15 are slidably connected to the inner cavities of the receiving grooves 15. First bearing plates 2 are fixedly connected to the top of the two connecting plates 13, first fixing holes 19 are formed in the side of the first bearing plate 2 close to the reactor cylinder 1, first telescopic rods 12 matched with the first fixing holes 19 are inserted into the inner cavities of the two first fixing holes 19, and the other end of the first telescopic rod 12 is fixedly connected with the adjacent annular plate 11. A plurality of first blind holes 20 arranged in a ring array are formed in the outer wall of the two first telescopic rods 12, and first T-shaped rods 21 matched with the first blind holes 20 are slidably connected to the top of the two first bearing plates 2. The bottom ends of the two first T-shaped rods 21 are respectively inserted into the inner cavities of the adjacent first blind holes 20, and first springs 22 are sleeved on the outer wall of the two first T-shaped rods 21, and the two ends of the first spring 22 are respectively fixedly connected with the first T-shaped rod 21 and the first bearing plate 2. Through the arrangement of the first bearing plate 2, the connecting plate 13 and the support plate 14, the reactor cylinder 1 can be vertically supported. At the same time, the first telescopic rod 12 can be rotatably arranged in the first fixing hole 19. The first T-shaped rod 21 can be pulled out of the inner cavity of the first blind hole 20, so that the reactor cylinder 1 can be disassembled, thereby improving the convenience of later reactor maintenance and maintenance.

[0032] A second blind hole 17 is formed in the right side of the connecting plate 13, and a second T-shaped rod 16 matched with the second blind hole 17 is slidably connected to the outer wall of the support plate 14. The longest end of the second T-shaped rod 16 is inserted into the inner cavity of the second blind hole 17 at the top. A second spring 18 is sleeved on the outer wall of the second T-shaped rod 16, and the two ends of the second spring 18 are respectively fixedly connected with the support plate 14 and the second T-shaped rod 16. By inserting the second T-shaped rod 16 into the second blind hole 17 at different positions, the position of the connecting plate 13 in the receiving groove 15 can be adjusted, and the distance between the first bearing plate 2 and the support plate 14 can be adjusted.

[0033] The support plate 14 is attached with the second bearing plate 26 close to one side of the reactor cylinder 1, and the other side of the second bearing plate 26 is provided with the second fixing hole 29 close to the top, the outer wall of the annular plate 11 at the bottom is fixedly connected with the second telescopic rod 25 matched with the second fixing hole 29, and the other end of the second telescopic rod 25 is inserted into the inner cavity of the second fixing hole 29, the outer wall of the second telescopic rod 25 is provided with a plurality of third blind holes 30 arranged in a ring array, the top of the second bearing plate 26 is slidingly connected with the third T-shaped rod 31 matched with the third blind hole 30, and the longest end of the third T-shaped rod 31 is inserted into the inner cavity of the adjacent third blind hole 30, the outer wall of the third T-shaped rod 31 is sleeved with the third spring 32, and the two ends of the third spring 32 are fixedly connected with the third T-shaped rod 31 and the second bearing plate 26 respectively, the first threaded hole 27 is formed on the second bearing plate 26 close to the bottom, the first T-shaped bolt 28 matched with the first threaded hole 27 is threadedly connected on the support plate 14, and the threaded end of the first T-shaped bolt 28 is threadedly connected in the inner cavity of the first threaded hole 27. By rotating the first T-shaped bolt 28 into the inner cavity of the first threaded hole 27, the second bearing plate 26 and the support plate 14 can be screw-fixed, and the reactor cylinder 1 can be further supported according to the above operation mode, and the stability of the reactor during operation is improved.

[0034] The second threaded hole 33 is formed on the left side of the second bearing plate 26, the vertical plate 34 is fixedly connected on the left side of the mounting plate 23 corresponding to the second threaded hole 33, and the second T-shaped bolt 35 matched with the second threaded hole 33 is threadedly connected on the vertical plate 34. By rotating the second T-shaped bolt 35 into the second threaded hole 33, the vertical support stability of the reactor cylinder 1 can be improved when the mounting plate 23 is installed from the side.

[0035] Working principle: the utility model discloses when using, first, through the external bolt cooperation mounting hole 24 installs the mounting plate 23 and is fixed on the workbench surface with the setting of support plate 14, connecting plate 13, first bearing plate 2 and first telescopic link 12, can support reactor cylinder 1 in the vertical direction, by the two first T-shaped bolt 28 is respectively screwed into the inner cavity of adjacent first threaded hole 27, so that the second bearing plate 26 cooperates first bearing plate 2 and is supported reactor cylinder 1 together, further improve the stability when reactor works, when when need to install reactor on the side, can first T-shaped bolt 28 is screwed out from first threaded hole 27, then, pull two first T-shaped rod 21 from adjacent first blind hole 20 inner cavity, then, anticlockwise rotate mounting plate 23 and rotate ninety degrees, first T-shaped rod 21 is inserted back into adjacent first blind hole 20 inner cavity, can, after rotating, press the above-mentioned operation mode and rotate second bearing plate 26 synchronously, then, pull two second T-shaped rod 16 from adjacent second blind hole 17 inner cavity and separate, push mounting plate 23 and move horizontally left, and close second bearing plate 26, by two second T-shaped bolt 35 is respectively screwed into adjacent second threaded hole 33, so that second bearing plate 26 and vertical plate 34 clamping fixed, and support reactor cylinder 1, in addition, when need to remove reactor cylinder 1, can pull two first T-shaped rod 21 and third T-shaped rod 31 are separated from adjacent first blind hole 20 and third blind hole 30 inner cavity, can, so that can facilitate the reactor to be disassembled, further improve the convenience of later staff's overhaul and maintenance.

Claims

1. A fixed bed reactor for denitration of nitric acid tail gas, comprising a reactor cylinder (1) and a reaction zone arranged on the reactor cylinder (1), characterized in that: The inner cavity of the reaction zone is provided with a fixed plate (7), and the top of the fixed plate (7) is provided with a flow guide (10), the bottom of the fixed plate (7) is provided with a reaction unit, and the reaction unit comprises two annular catalyst baskets (3) which are arranged in parallel at intervals and filled with catalyst (4) and a top sealing plate (5) arranged at the top of the two annular catalyst baskets (3), a plurality of gas inlet channels (8) and gas outlet channels (9) are arranged at intervals between the annular catalyst baskets (3) and the catalyst (4) of the two adjacent reaction units, the bottoms of the annular catalyst baskets (3) of the two adjacent reaction units are fixedly connected through a bottom sealing plate (6), the annular catalyst basket (3) is perpendicular to the fixed plate (7), the annular catalyst basket (3) is a gas permeable structure, and the outer side of the reactor cylinder (1) is provided with a mounting mechanism.

2. The fixed bed reactor for removing nitrogen oxides from a tail gas according to claim 1, characterized in that: The mounting mechanism comprises two annular plates (11) distributed above and below, and the two annular plates (11) are sleeved and fixed on the outer wall of the reactor cylinder (1), the bottom of the reactor cylinder (1) is provided with a mounting plate (23), and the top of the mounting plate (23) is fixedly connected with support plates (14) on the left and right sides, the top of each of the two support plates (14) is provided with a receiving groove (15), and the inner cavity of the receiving groove (15) is slidably connected with a connecting plate (13) matched therewith, the top of each of the two connecting plates (13) is fixedly connected with a first load-bearing plate (2), and a first fixed hole (19) is formed in the side of the first load-bearing plate (2) close to the reactor cylinder (1), a first telescopic rod (12) matched with the first fixed hole (19) is inserted into the inner cavity of each of the two first fixed holes (19), and the other end of the first telescopic rod (12) is fixedly connected with the adjacent annular plate (11), a plurality of first blind holes (20) arranged in an annular array are formed in the outer wall of each of the two first telescopic rods (12), and a first T-shaped rod (21) matched with the first blind hole (20) is slidably connected to the top of each of the two first load-bearing plates (2), the bottom end of each of the two first T-shaped rods (21) is inserted into the inner cavity of the adjacent first blind hole (20), and a first spring (22) is sleeved on the outer wall of each of the two first T-shaped rods (21), and the two ends of the first spring (22) are fixedly connected with the first T-shaped rod (21) and the first load-bearing plate (2) respectively.

3. The fixed bed reactor for removing nitrogen oxides from a tail gas according to claim 2, wherein: A second blind hole (17) is formed in the right side of the connecting plate (13), and a second T-shaped rod (16) matched with the second blind hole (17) is slidably connected to the outer wall of the support plate (14), the longest end of the second T-shaped rod (16) is inserted into the inner cavity of the top second blind hole (17), a second spring (18) is sleeved on the outer wall of the second T-shaped rod (16), and the two ends of the second spring (18) are fixedly connected with the support plate (14) and the second T-shaped rod (16) respectively.

4. The fixed bed reactor for removing nitrogen oxides from a tail gas according to claim 3, characterized in that: The support plate (14) is attached with a second load-bearing plate (26) near one side of the reactor cylinder (1), and the other side of the second load-bearing plate (26) is provided with a second fixed hole (29) near the top, the outer wall of the annular plate (11) at the bottom is fixedly connected with a second telescopic rod (25) matched with the second fixed hole (29), and the other end of the second telescopic rod (25) is inserted into the inner cavity of the second fixed hole (29), the outer wall of the second telescopic rod (25) is provided with a plurality of third blind holes (30) arranged in a ring array, the top of the second load-bearing plate (26) is slidably connected with a third T-shaped rod (31) matched with the third blind hole (30), and the longest end of the third T-shaped rod (31) is inserted into the inner cavity of the adjacent third blind hole (30), the outer wall of the third T-shaped rod (31) is sleeved with a third spring (32), and the two ends of the third spring (32) are fixedly connected with the third T-shaped rod (31) and the second load-bearing plate (26) respectively, the first threaded hole (27) is formed in the second load-bearing plate (26) near the bottom, and the first T-shaped bolt (28) matched with the first threaded hole (27) is threadedly connected on the support plate (14), and the threaded end of the first T-shaped bolt (28) is threadedly connected in the inner cavity of the first threaded hole (27).

5. The fixed bed reactor for removing nitrogen oxides from a tail gas according to claim 4, characterized in that: The left side of the second load-bearing plate (26) is provided with a second threaded hole (33), and the left side of the mounting plate (23) corresponding to the second threaded hole (33) is fixedly connected with a vertical plate (34), and the vertical plate (34) is threadedly connected with a second T-shaped bolt (35) matched with the second threaded hole (33).

6. The fixed bed reactor for removing nitrogen oxides from a tail gas according to claim 2, wherein: The mounting plate (23) is provided with a mounting hole (24) at each corner.

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