Mixing device for SCR (Selective Catalytic Reduction) flue gas denitration system

Abstract

The utility model relates to the technical field of flue gas treatment, in particular to a mixing device for an SCR (Selective Catalytic Reduction) flue gas denitration system, which comprises a mixing chamber, a gas inlet pipe is arranged on the left side of the mixing chamber, a gas outlet pipe is arranged on the right side of the mixing chamber, a wall scraping device is arranged in the mixing chamber, and the wall scraping device comprises a first bracket; the first support is installed on the inner wall, close to the air inlet pipe, of the mixing chamber, the inner wall of the first support is rotationally connected with a reciprocating lead screw, the left end of the reciprocating lead screw is connected with an impeller, the impeller is located in the air inlet pipe, and the inner wall of the mixing chamber is slidably connected with a sliding support. Through the arrangement of the wall scraping device, the sliding support can continuously scrape off smoke dust attached to the inner wall of the mixing chamber through reciprocating motion, and the situation that after long-time use, the smoke dust on the inner wall of the mixing chamber is accumulated too thick, and consequently the mixing effect is affected is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas treatment, in particular to a mixing device for an SCR flue gas denitration system. Background Art

[0002] The SCR flue gas denitrification system is a technology used to reduce the emission of nitrogen oxides in flue gas. It converts nitrogen oxides into harmless nitrogen and water vapor by spraying ammonia or urea solution into the flue gas and then reacting with a catalyst. The SCR system usually consists of an ammonia injection system, a catalyst reactor, an ammonia spray system, an ammonia storage tank, a control system, etc. The mixing device in the SCR flue gas denitrification system is used to fully mix the ammonia and nitrogen oxides in the flue gas to promote the SCR reaction. This device is usually located before the SCR reactor to ensure that the ammonia and nitrogen oxides are fully mixed before entering the catalyst layer. The design of the mixing device affects the performance and denitrification efficiency of the SCR system.

[0003] Chinese patent publication number CN213286350U discloses "a mixing device for SCR flue gas denitrification system", including a first toothed plate and a second toothed plate; the first toothed plate and the second toothed plate are arranged in pairs in an interlaced manner in the flue; the first toothed plate and the second toothed plate are connected by fins, and the angle between two adjacent fins is 40° to 140°; the fins are parallelogram structures. The patent divides and deflects the horizontally flowing flue gas by the first toothed plate and the second toothed plate to accelerate the flue gas through the contraction flue gas channel formed between the first toothed plate and the second toothed plate. The adjacent flue gas channels are deflected in opposite directions (one deflects upward and the other deflects downward), forming a cross flow, which causes the flue gas to generate vortices during the downstream flow process, further promoting the mixing and homogenization of the flue gas itself, which can achieve full coverage of the flue gas cross section without dead angles, and is particularly suitable for mixing flue gas flows with obvious stratification in temperature, concentration or velocity, and can effectively separate part of the smoke dust.

[0004] During the conception process, the applicant searched a large number of patent documents on the patent network. For example, Chinese patent publication number CN213286350U discloses "a mixing device for an SCR flue gas denitrification system". After long-term use, a lot of dust is easily attached to the inside of the device. Thick dust accumulation may reduce the volume inside the device and deteriorate the mixing effect, thereby affecting the mixing efficiency of the device and affecting the subsequent flue gas denitrification effect. Therefore, a mixing device for an SCR flue gas denitrification system is proposed to solve the above-mentioned problems. Utility Model Content

[0005] In view of the deficiencies of the prior art, the utility model provides a mixing device for an SCR flue gas denitration system, which solves the problems raised in the above background technology. To achieve the above purpose, the utility model is implemented through the following technical solutions: a mixing device for an SCR flue gas denitration system, comprising a mixing chamber, an air inlet pipe is installed on the left side of the mixing chamber, an air outlet pipe is installed on the right side of the mixing chamber, a dosing pipe assembly is arranged on the left inner wall of the mixing chamber, the dosing pipe assembly comprises a medicine pipe, the medicine pipe is installed on the left inner wall of the mixing chamber, an atomizing nozzle is installed on the right end of the medicine pipe, a wall scraping device is arranged inside the mixing chamber, the wall scraping device comprises a No. 1 bracket, the No. 1 bracket is installed on the inner wall of the mixing chamber close to the air inlet pipe, a reciprocating screw is rotatably connected to the inner wall of the No. 1 bracket, an impeller is connected to the left end of the reciprocating screw, the impeller is located inside the air inlet pipe, and a sliding bracket is slidably connected to the inner wall of the mixing chamber.

[0006] Preferably, a No. 2 bracket is installed on the inner wall of the mixing chamber close to the air outlet pipe, and the left side of the No. 2 bracket is rotatably connected to the right end of the reciprocating screw.

[0007] Preferably, a reciprocating thread groove is provided on the surface of the reciprocating screw, and the sliding bracket is slidably connected to the reciprocating thread groove on the surface of the reciprocating screw via a ball.

[0008] Preferably, a plurality of round rods are mounted on the sliding bracket, and a plurality of spoilers are rotatably mounted on the plurality of round rods.

[0009] Preferably, a descaling device is provided on the sliding bracket, and the descaling device includes a rotating seat, the rotating seat is rotatably mounted on the sliding bracket, an internal threaded tube is mounted on the rotating seat, a descaling wipe is mounted on the rotating seat, and the descaling wipe is located inside the internal threaded tube.

[0010] Preferably, an externally threaded tube is installed on a section of the outer wall of the medicine tube located inside the mixing chamber, the externally threaded tube is located on the movement trajectory of the internally threaded tube, and the atomizing nozzle is located on the movement trajectory of the descaling wipe.

[0011] Preferably, the threads of the internally threaded pipe match the threads of the externally threaded pipe, and a ball is provided on the threads of the internally threaded pipe.

[0012] It can be seen from the above technical solutions that the mixing device for the SCR flue gas denitrification system provided in the embodiments of this specification has at least the following beneficial effects:

[0013] (1) The utility model provides a wall scraping device so that the sliding bracket can continuously scrape off the smoke and dust attached to the inner wall of the mixing chamber through reciprocating movement, thereby preventing the smoke and dust from accumulating too thickly on the inner wall of the mixing chamber after long-term use, resulting in a reduction in the volume of the mixing chamber, reducing the reaction space between the smoke and the agent, and thus affecting the mixing effect. The provision of multiple spoilers allows the smoke inside the mixing chamber to be fully stirred, thereby promoting the contact between the smoke and the agent, enhancing the mixing efficiency, and preventing the smoke from passing through the mixing chamber too quickly and causing insufficient mixing. The sliding bracket and the spoiler are both driven by wind power, thereby achieving the effect of saving energy.

[0014] (2) The utility model provides a descaling device so that the descaling wipe can periodically descale the surface of the atomizing nozzle, thereby preventing the atomizing nozzle from being clogged by dust and dirt due to the large amount of smoke and dust inside the mixing chamber after the atomizing nozzle is used for a long time, thereby affecting the atomization effect of the agent. Poor atomization of the agent will lead to poor mixing effect, thereby affecting subsequent processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application:

[0016] Figure 1 This is a schematic diagram of the appearance of the utility model;

[0017] Figure 2 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the wall scraping device in the utility model;

[0019] Figure 4 It is a structural schematic diagram of the sliding bracket in the utility model;

[0020] Figure 5 For the utility model Figure 4 A magnified schematic diagram of point A;

[0021] Figure 6 It is a structural schematic diagram of the descaling device in the utility model.

[0022] In the figure: 1. mixing chamber; 2. air inlet pipe; 3. air outlet pipe; 4. dosing pipe assembly; 41. medicine pipe; 42. atomizing nozzle; 5. wall scraper; 51. bracket No. 1; 52. bracket No. 2; 53. reciprocating screw; 54. impeller; 55. sliding bracket; 56. round rod; 57. spoiler; 6. descaling device; 61. external threaded pipe; 62. rotating seat; 63. internal threaded pipe; 64. descaling wipe. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Example 1

[0025] See also Figure 1-Figure 6 As shown, a mixing device for an SCR flue gas denitrification system includes a mixing chamber 1, an air inlet pipe 2 is installed on the left side of the mixing chamber 1, an air outlet pipe 3 is installed on the right side of the mixing chamber 1, a dosing pipe assembly 4 is arranged on the left inner wall of the mixing chamber 1, and the dosing pipe assembly 4 includes a reagent pipe 41, the reagent pipe 41 is installed on the left inner wall of the mixing chamber 1, and an atomizing nozzle 42 is installed on the right end of the reagent pipe 41. The flue gas is transported to the mixing chamber 1 through the air inlet pipe 2, and the reagent is transported to the atomizing nozzle 42 through the reagent pipe 41. The nozzle 42 sprays in the mixing chamber 1, so that the medicine and smoke in the mixing chamber 1 are fully integrated; the interior of the mixing chamber 1 is provided with a scraping device 5, and the scraping device 5 includes a No. 1 bracket 51, and the No. 1 bracket 51 is installed on the inner wall of the mixing chamber 1 close to the air inlet pipe 2, and the inner wall of the No. 1 bracket 51 is rotatably connected with a reciprocating screw rod 53, and the left end of the reciprocating screw rod 53 is connected with an impeller 54, and the impeller 54 is located inside the air inlet pipe 2, and the inner wall of the mixing chamber 1 is slidably connected with a sliding bracket 55, and the inner wall of the mixing chamber 1 close to the air outlet pipe 3 is installed There is a No. 2 bracket 52, the left side of the No. 2 bracket 52 is rotatably connected to the right end of the reciprocating screw 53, the surface of the reciprocating screw 53 is provided with a reciprocating thread groove, and the sliding bracket 55 is slidably connected to the reciprocating thread groove on the surface of the reciprocating screw 53 through a ball bearing. When the smoke passes through the air intake pipe 2, due to the effect of wind force, the smoke drives the impeller 54 to rotate, and when the impeller 54 rotates, it drives the reciprocating screw 53 on the No. 1 bracket 51 and the No. 2 bracket 52 to rotate. When the reciprocating screw 53 rotates, it drives the sliding bracket through the ball bearing 55 reciprocates on the inner wall of the mixing chamber 1. During the reciprocating movement of the sliding bracket 55, the edge of the sliding bracket 55 will scrape off the smoke and dust attached to the inner wall of the mixing chamber 1; a plurality of round rods 56 are installed on the sliding bracket 55, and a plurality of spoilers 57 are rotatably installed on the plurality of round rods 56. When the smoke enters the mixing chamber 1, it will contact the plurality of spoilers 57 and be driven by wind force to rotate around the plurality of round rods 56. The plurality of spoilers 57 can promote the spoiler effect by rotating.

[0026] In this embodiment, the wall scraper device 5 is provided so that the sliding bracket 55 can continuously scrape off the smoke and dust attached to the inner wall of the mixing chamber 1 through reciprocating movement, so as to avoid the smoke and dust on the inner wall of the mixing chamber 1 being too thick after long-term use, resulting in a reduction in the volume of the mixing chamber 1, reducing the reaction space between the smoke and the agent, thereby affecting the mixing effect. The provision of multiple spoilers 57 allows the smoke inside the mixing chamber 1 to be fully stirred, thereby promoting the contact between the smoke and the agent, enhancing the mixing efficiency, and avoiding the smoke passing through the mixing chamber 1 too quickly to cause insufficient mixing. The sliding bracket 55 and the spoiler 57 are both driven by wind power, thereby achieving the effect of saving energy.

[0027] Example 2

[0028] See also Figure 4-Figure 6 As shown, a descaling device 6 is provided on the sliding bracket 55, and the descaling device 6 includes a rotating seat 62, which is rotatably mounted on the sliding bracket 55, an internally threaded tube 63 is mounted on the rotating seat 62, and a descaling wipe 64 is mounted on the rotating seat 62. The descaling wipe 64 is located inside the internally threaded tube 63, and an externally threaded tube 61 is mounted on a section of the outer wall of the medicament tube 41 located inside the mixing chamber 1. The externally threaded tube 61 is located on the movement track of the internally threaded tube 63, and the atomizing nozzle 42 is located on the movement track of the descaling wipe 64. When the descaling wipe 64 contacts the atomizing nozzle 42, the descaling wipe 64 rotates to move the atomizer. The dust and dirt on the surface of the nozzle 42 are wiped off, the thread of the internal threaded tube 63 matches the thread of the external threaded tube 61, and a ball is provided on the thread of the internal threaded tube 63. When the internal threaded tube 63 moves to the left, the internal threaded tube 63 will contact the external threaded tube 61. Since the threads of the internal threaded tube 63 and the external threaded tube 61 match, when the internal threaded tube 63 and the external threaded tube 61 come into contact, the internal threaded tube 63 is merged with the external threaded tube 61 by sliding the ball along the thread of the external threaded tube 61, so that the internal threaded tube 63 will rotate during the merging process with the external threaded tube 61.

[0029] In this embodiment, the descaling device 6 is provided so that the descaling wipe 64 can periodically descal the surface of the atomizing nozzle 42, so as to avoid scaling on the surface of the atomizing nozzle 42 due to the large amount of smoke and dust inside the mixing chamber 1 after the atomizing nozzle 42 is used for a long time, so that the atomizing nozzle 42 is blocked by dust and scale, thereby affecting the atomization effect of the agent. Poor atomization of the agent will lead to poor mixing effect, thereby affecting subsequent processes.

[0030] When the mixing device of the utility model for SCR flue gas denitration system is in use, the flue gas is transported to the mixing chamber 1 through the air intake pipe 2, and the reagent is transported to the atomizing nozzle 42 through the reagent pipe 41, and is sprayed in the mixing chamber 1 through the atomizing nozzle 42, so that the reagent and the flue gas in the mixing chamber 1 are fully integrated, and the mixing and homogenization of the flue gas itself are promoted. The mixed flue gas is discharged to the next process through the air outlet pipe 3. When the flue gas passes through the air intake pipe 2, due to the effect of wind force, the flue gas drives the impeller 54 to rotate. When the impeller 54 rotates, it drives the reciprocating screw rod 53 on the first bracket 51 and the second bracket 52 to rotate. When the reciprocating screw rod 53 rotates, it drives the sliding bracket 55 to reciprocate on the inner wall of the mixing chamber 1 through the ball bearing. During the reciprocating movement of the sliding bracket 55, the edge of the sliding bracket 55 will scrape off the smoke and dust attached to the inner wall of the mixing chamber 1 to avoid the accumulation of smoke and dust. When the impeller 54 rotates, it will The flue gas has a certain turbulent effect. When the flue gas enters the mixing chamber 1, it will contact multiple spoiler plates 57 and be driven by wind to rotate around multiple round rods 56. The multiple spoiler plates 57 can promote the turbulent effect by rotating. Through the setting of the scraper device 5, the sliding bracket 55 can continuously scrape off the smoke and dust attached to the inner wall of the mixing chamber 1 through reciprocating movement, so as to avoid excessive accumulation of smoke and dust on the inner wall of the mixing chamber 1 after long-term use, resulting in a reduction in the volume of the mixing chamber 1, reducing the reaction space between the smoke and the agent, thereby affecting the mixing effect. The setting of multiple spoiler plates 57 allows the smoke inside the mixing chamber 1 to be fully stirred, thereby promoting the contact between the smoke and the agent, enhancing the mixing efficiency, and avoiding the smoke passing through the mixing chamber 1 too quickly to cause insufficient mixing. The sliding bracket 55 and the spoiler plates 57 are both driven by wind, thereby achieving the effect of saving energy.

[0031] When the sliding bracket 55 reciprocates, the sliding bracket 55 drives the rotating seat 62 to reciprocate, and the rotating seat 62 drives the internal threaded tube 63 and the descaling wipe 64 to reciprocate. When the internal threaded tube 63 moves to the left, the internal threaded tube 63 will contact the external threaded tube 61. Since the threads of the internal threaded tube 63 and the external threaded tube 61 match, when the internal threaded tube 63 and the external threaded tube 61 come into contact, the internal threaded tube 63 is merged with the external threaded tube 61 by sliding the ball along the threads of the external threaded tube 61, so that the internal threaded tube 63 will rotate in the process of merging with the external threaded tube 61, and the internal threaded tube 63 will rotate. When the tube 63 rotates, it drives the rotating seat 62 to rotate, and the rotating seat 62 drives the descaling wiper 64 to rotate. When the descaling wiper 64 contacts the atomizing nozzle 42, the descaling wiper 64 wipes off the dust and scale on the surface of the atomizing nozzle 42 by rotating. Through the arrangement of the descaling device 6, the descaling wiper 64 can periodically descale the surface of the atomizing nozzle 42 to avoid scaling on the surface of the atomizing nozzle 42 after the atomizing nozzle 42 is used for a long time due to the large amount of smoke and dust inside the mixing chamber 1, so that the atomizing nozzle 42 is blocked by dust and scale, affecting the effect of the atomization of the agent. Poor atomization of the agent will lead to poor mixing effect, thereby affecting subsequent processes.

[0032] The above implementation methods are only used to illustrate the embodiments of the present utility model, and are not limitations of the embodiments of the present utility model. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the embodiments of the present utility model. Therefore, all equivalent technical solutions also belong to the scope of the embodiments of the present utility model. The patent protection scope of the embodiments of the present utility model should be limited by the claims.

Claims

1. A mixing device for an SCR flue gas denitration system, comprising a mixing chamber (1), characterized in that: An air inlet pipe (2) is installed on the left side of the mixing chamber (1), an air outlet pipe (3) is installed on the right side of the mixing chamber (1), a dosing pipe assembly (4) is provided on the left inner wall of the mixing chamber (1), the dosing pipe assembly (4) comprises a medicine pipe (41), the medicine pipe (41) is installed on the left inner wall of the mixing chamber (1), an atomizing nozzle (42) is installed on the right end of the medicine pipe (41), and a wall scraper is provided inside the mixing chamber (1). The wall scraping device (5) comprises a first bracket (51), the first bracket (51) is installed on the inner wall of the mixing chamber (1) close to the air inlet pipe (2), the inner wall of the first bracket (51) is rotatably connected to a reciprocating screw (53), the left end of the reciprocating screw (53) is connected to an impeller (54), the impeller (54) is located inside the air inlet pipe (2), and the inner wall of the mixing chamber (1) is slidably connected to a sliding bracket (55).

2. A mixing device for an SCR flue gas denitration system according to claim 1, characterized in that: A second bracket (52) is installed on the inner wall of the mixing chamber (1) close to the air outlet pipe (3), and the left side of the second bracket (52) is rotatably connected to the right end of the reciprocating screw rod (53).

3. A mixing device for an SCR flue gas denitration system according to claim 2, characterized in that: The surface of the reciprocating screw rod (53) is provided with a reciprocating thread groove, and the sliding bracket (55) is slidably connected to the reciprocating thread groove on the surface of the reciprocating screw rod (53) via a ball.

4. A mixing device for an SCR flue gas denitration system according to claim 3, characterized in that: A plurality of round rods (56) are mounted on the sliding bracket (55), and a plurality of spoilers (57) are rotatably mounted on the plurality of round rods (56).

5. A mixing device for an SCR flue gas denitration system according to claim 4, characterized in that: The sliding bracket (55) is provided with a descaling device (6), the descaling device (6) comprises a rotating seat (62), the rotating seat (62) is rotatably mounted on the sliding bracket (55), an internally threaded tube (63) is mounted on the rotating seat (62), a descaling wipe (64) is mounted on the rotating seat (62), and the descaling wipe (64) is located inside the internally threaded tube (63).

6. A mixing device for an SCR flue gas denitration system according to claim 5, characterized in that: An externally threaded tube (61) is installed on a section of the outer wall of the medicine tube (41) located inside the mixing chamber (1); the externally threaded tube (61) is located on the movement trajectory of the internally threaded tube (63); and the atomizing nozzle (42) is located on the movement trajectory of the descaling wipe (64).

7. A mixing device for an SCR flue gas denitration system according to claim 6, characterized in that: The threads of the internally threaded tube (63) match the threads of the externally threaded tube (61), and a ball is arranged on the threads of the internally threaded tube (63).

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