Flue gas denitration ammonia spraying device for thermal power plant

Abstract

The utility model discloses a flue gas denitration ammonia spraying device for a thermal power plant, and relates to the technical field of flue gas purification. The flue gas denitration ammonia spraying device of the thermal power plant comprises a flue gas purification pipeline, the flue gas purification pipeline comprises an ammonia spraying pipe section and a mixing pipe section fixedly communicated with the top end of the ammonia spraying pipe section, the ammonia spraying pipe section is fixedly communicated with a flue gas inlet pipe, the top of the mixing pipe section is provided with an exhaust port, and a pair of fixing supports distributed up and down are fixedly connected in the ammonia spraying pipe section. A first ammonia spraying and atomizing system is arranged on the fixed bracket positioned at the bottom; the first ammonia spraying and atomizing system comprises a first ammonia spraying pipe, a plurality of first atomizing nozzles, a rotary joint and an ammonia gas inlet pipe. The utility model solves the technical problem that the denitration quality of the flue gas cannot be guaranteed because the mixing degree of the sprayed ammonia substance and the flue gas is easily reduced due to the insufficient spraying flexibility of the ammonia substance in the conventional denitration ammonia spraying device which is mostly fixed.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas purification, and more specifically to a flue gas denitration and ammonia spraying device for a thermal power plant. Background Art

[0002] At present, there are two main flue gas denitrification technologies: dry method (selective catalytic reduction flue gas denitrification, selective non-catalytic reduction denitrification) and wet method. Compared with wet flue gas denitrification technology, the main advantages of dry flue gas denitrification technology are: low basic investment, simple equipment and process, and high efficiency of removing NOX. At present, in thermal power plants, more flue gas is generated, and an ammonia spraying device is needed to spray ammonia substances to react with flue gas for flue gas denitrification.

[0003] At present, the ammonia spraying device for flue gas denitrification used in thermal power plants is mostly fixed. Due to the lack of flexibility in spraying the ammonia substance, it is easy to reduce the mixing degree of the sprayed ammonia substance and the flue gas, which cannot guarantee the denitrification quality of the flue gas. For this reason, the present application proposes a ammonia spraying device for flue gas denitrification in thermal power plants. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, an embodiment of the utility model provides a flue gas denitrification ammonia spraying device for a thermal power plant. The technical problem to be solved by the utility model is that most of the current denitrification ammonia spraying devices are fixed, and due to the lack of flexibility in spraying the ammonia substance, it is easy to reduce the mixing degree of the sprayed ammonia substance and the flue gas, which makes it impossible to guarantee the technical problem of the denitrification quality of the flue gas.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a flue gas denitrification ammonia injection device for a thermal power plant, comprising a clean smoke pipeline, the clean smoke pipeline comprising an ammonia injection pipe section and a mixing pipe section fixedly connected to the top of the ammonia injection pipe section, the ammonia injection pipe section is fixedly connected to a flue gas inlet pipe, the top of the mixing pipe section is provided with an exhaust port, a pair of fixed brackets distributed up and down are fixedly connected in the ammonia injection pipe section, a first ammonia injection atomization system is provided on the fixed bracket located at the bottom, the first ammonia injection atomization system comprises a first ammonia injection pipe connected to the bottom of the fixed bracket by a shaft, a plurality of first atomization nozzles fixedly connected to the bottom of the first ammonia injection pipe, and a plurality of first atomization nozzles fixedly connected to the bottom of the first ammonia injection pipe. A rotating joint is provided at the middle end of the bottom of the first ammonia injection pipe, and an ammonia inlet pipe is arranged at the end of the rotating joint and fixedly passes through the ammonia injection pipe section. A rotating module for driving the first ammonia injection pipe to rotate is provided on the fixed bracket at the bottom. A second ammonia injection atomization system is connected to the fixed bracket at the top through an axis rotation. The second ammonia injection atomization system is connected to the first ammonia injection pipe. The rotating module is also used to drive the second ammonia injection atomization system to rotate. A first spoiler assembly is provided in the mixing pipe section. A second spoiler assembly is also provided in the mixing pipe section. The second spoiler assembly passes through the first spoiler assembly and is coaxially fixed to the second ammonia injection atomization system.

[0006] In a preferred embodiment, a through slot is provided on the fixing bracket.

[0007] In a preferred embodiment, the rotating module includes a rotating motor fixedly connected to a fixed bracket located at the bottom, a first gear fixedly connected to the power output end of the rotating motor, a second gear meshingly connected to the first gear, and a hollow rotating rod fixedly connected to the middle end of the second gear; the hollow rotating rod is fixedly connected to the shaft of the first ammonia injection pipe, and the shaft is a hollow shaft.

[0008] In a preferred embodiment, the second ammonia spray atomization system includes a second ammonia spray pipe and a plurality of second atomizing nozzles fixedly connected to the bottom of the second ammonia spray pipe; the top end of the hollow rotating rod is fixedly connected to the middle end position of the bottom of the second ammonia spray pipe; the second ammonia spray pipe and the first ammonia spray pipe are vertically distributed.

[0009] In a preferred embodiment, the first spoiler assembly includes a spoiler plate fixedly connected to the mixing pipe section and a plurality of spoiler inclined holes formed on the spoiler plate.

[0010] In a preferred embodiment, the second spoiler assembly includes a stirring rod arranged in the mixing pipe section and a fan blade fixedly connected to the end of the stirring rod; the stirring rod movably passes through the spoiler and is coaxially fixedly connected to the rotating shaft of the second ammonia injection pipe.

[0011] In a preferred embodiment, a filter plate is fixedly connected inside the ammonia spray pipe section, and the filter plate is located below the first ammonia spray atomization system and above the flue gas inlet pipe.

[0012] Technical effects and advantages of the utility model:

[0013] The utility model arranges a first ammonia spray atomization system, a second ammonia spray atomization system and a rotating module, utilizes the first ammonia spray pipe and the second ammonia spray pipe to be vertically distributed and connected, and a rotating motor drives a hollow rotating rod to rotate. Then, the first ammonia spray pipe and the second ammonia spray pipe can perform ammonia spray based on rotation in the ammonia spray pipe section. The covering spray of ammonia can effectively mix the introduced flue gas, thereby ensuring the mixing quality of the flue gas denitrification ammonia spray, thereby improving the flue gas purification effect.

[0014] The utility model arranges a first spoiler component and a second spoiler component. When the flue gas mixed with ammonia rises, the spoiler inclined hole provides a penetration channel for the mixed gas, so that the mixed gas can rise in a spiral manner, thereby achieving the purpose of increasing the mixed collision of the mixed gas. At the same time, the second spoiler component can rotate and stir using the power of the rotating module, so that the spirally rising mixed gas can be further stirred and mixed to ensure the reaction effect of the flue gas and ammonia, thereby improving the quality of flue gas denitrification in thermal power plants. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0016] Figure 2 For this utility model Figure 1 sectional view of .

[0017] Figure 3 It is a schematic structural diagram of the first ammonia spray atomization system, the rotating module and the second ammonia spray atomization system of the utility model.

[0018] Figure 4 It is a plan view of the first spoiler component of the utility model.

[0019] Figure 5 It is a schematic structural diagram of the second ammonia spray atomization system and the second spoiler assembly of the utility model.

[0020] The accompanying drawings are marked as follows: 1. ammonia spray pipe section; 2. mixing pipe section; 3. flue gas inlet pipe; 4. exhaust port; 5. fixed bracket; 6. first ammonia spray atomization system; 61. first ammonia spray pipe; 62. first atomizing nozzle; 63. rotary joint; 64. ammonia inlet pipe; 7. rotating module; 71. rotating motor; 72. first gear; 73. second gear; 74. hollow rotating rod; 8. second ammonia spray atomization system; 81. second ammonia spray pipe; 82. second atomizing nozzle; 9. first spoiler assembly; 91. spoiler plate; 92. spoiler inclined hole; 10. second spoiler assembly; 101. stirring rod; 102. fan blade; 11. filter plate; 12. through groove. DETAILED DESCRIPTION

[0021] Combined with reference Figure 1 The utility model provides a flue gas denitration and ammonia spraying device for a thermal power plant, comprising a clean smoke pipeline, the clean smoke pipeline comprising an ammonia spraying pipe section 1 and a mixing pipe section 2 fixedly connected to the top of the ammonia spraying pipe section 1; the ammonia spraying pipe section 1 sprays ammonia on the flue gas of the thermal power plant, and the mixing pipe section 2 can further mix the ammonia sprayed flue gas; a flue gas inlet pipe 3 is fixedly connected to the ammonia spraying pipe section 1; the flue gas inlet pipe 3 can be connected to the flue gas generated by the thermal power plant, so as to be sent into the clean smoke pipeline for denitration and ammonia spraying treatment of the flue gas; an exhaust port 4 is arranged on the top of the mixing pipe section 2; the exhaust port 4 can be used to discharge the purified flue gas.

[0022] Combined with reference Figure 2-Figure 3 A pair of fixed brackets 5 distributed up and down are fixedly connected in the ammonia injection pipe section 1, and a first ammonia injection atomization system 6 is arranged on the fixed bracket 5 located at the bottom. The first ammonia injection atomization system 6 includes a first ammonia injection pipe 61 rotatably connected to the bottom of the fixed bracket 5 by an axis, a plurality of first atomizing nozzles 62 fixedly connected to the bottom of the first ammonia injection pipe 61, a rotary joint 63 arranged at the middle end of the bottom of the first ammonia injection pipe 61, and an ammonia inlet pipe 64 arranged at the end of the rotary joint 63 and fixedly passing through the ammonia injection pipe section 1. A rotating module 7 for driving the first ammonia injection pipe 61 to rotate is arranged on the fixed bracket 5 located at the bottom; in the present application, the first ammonia injection pipe 61 is rotatably connected to the ammonia inlet pipe 64 through the rotary joint 63, so that when the first ammonia injection pipe 61 rotates, the ammonia inlet pipe 64 can be in a state of fixedly inputting ammonia.

[0023] The fixed bracket 5 is provided with a through groove 12; the provision of the through groove 12 can reduce the smoke interception area of ​​the fixed bracket 5 to ensure that the smoke is effectively discharged by rising.

[0024] The rotating module 7 includes a rotating motor 71 fixedly connected to a fixed bracket 5 at the bottom, a first gear 72 fixedly connected to a power output end of the rotating motor 71, a second gear 73 meshingly connected to the first gear 72, and a hollow rotating rod 74 fixedly connected to the middle end of the second gear 73; the hollow rotating rod 74 is fixedly connected to the shaft of the first ammonia injection pipe 61, and the shaft is a hollow shaft; the advantage of the hollow shaft design is that the first ammonia injection pipe 61 can be connected to the hollow rotating rod 74, so that the ammonia gas in the first ammonia injection pipe 61 can be easily circulated.

[0025] Specifically, by connecting the ammonia inlet pipe 64 to an external ammonia pump, ammonia can be pumped into the first ammonia injection pipe 61, and the first atomizing nozzle 62 disperses and sprays the ammonia. The rotating motor 71 is started to drive the first gear 72 and the second gear 73 to engage and transmit. The second gear 73 can drive the first ammonia injection pipe 61 to rotate and spray ammonia through the hollow rotating rod 74. The rotating ammonia spraying method can improve the mixing degree of ammonia and flue gas.

[0026] A second ammonia spray atomization system 8 is connected to the fixed bracket 5 at the top through an axial rotation. The second ammonia spray atomization system 8 is connected to the first ammonia spray pipe 61. The rotation module 7 is also used to drive the second ammonia spray atomization system 8 to rotate. A first spoiler component 9 is arranged in the mixing pipe section 2. A second spoiler component 10 is also arranged in the mixing pipe section 2. The second spoiler component 10 passes through the first spoiler component 9 and is coaxially fixed to the second ammonia spray atomization system 8.

[0027] The second ammonia spray atomization system 8 includes a second ammonia spray pipe 81 and a plurality of second atomizing nozzles 82 fixedly connected to the bottom of the second ammonia spray pipe 81; the top end of the hollow rotating rod 74 is fixedly connected to the middle end position of the bottom of the second ammonia spray pipe 81; the second ammonia spray pipe 81 and the first ammonia spray pipe 61 are vertically distributed; the vertically distributed first ammonia spray pipe 61 and the second ammonia spray pipe 81, when the two rotate synchronously, the ammonia sprayed is staggered and rotated, so that the mixing degree of the flue gas and the ammonia can be further improved, thereby ensuring the mixing effect of the flue gas and the ammonia.

[0028] Specifically, because the hollow rotating rod 74 connects the first ammonia injection pipe 61 and the second ammonia injection pipe 81 and drives the two to rotate, the ammonia gas delivered through the ammonia inlet pipe 64 can also enter the second ammonia injection pipe 81, and the ammonia gas is sprayed through the first atomizing nozzle 62 and the second atomizing nozzle 82 at the same time. By staggering and rotating the sprayed ammonia gas, the mixing degree of the flue gas and ammonia gas can be further improved, thereby ensuring the mixing effect of the flue gas and ammonia gas.

[0029] A filter plate 11 is fixedly connected inside the ammonia spray pipe section 1. The filter plate 11 is located below the first ammonia spray atomization system 6 and above the flue gas inlet pipe 3. The filter plate 11 can be used to filter impurities in the flue gas to avoid clogging of the first atomizing nozzle 62 and the second atomizing nozzle 82 due to impurities.

[0030] Combined with reference Figure 4 The first spoiler assembly 9 includes a spoiler plate 91 fixedly connected to the mixing pipe section 2 and a plurality of spoiler inclined holes 92 opened on the spoiler plate 91 .

[0031] After the flue gas and ammonia in a thermal power plant are mixed, they can continue to rise until they pass the spoiler 91. Several spoiler inclined holes 92 can form a swirl channel for the mixed gas to pass through. In this way, the mixed gas can present a spiral effect when it rises above the spoiler 91. The mixed gas with a spiral effect can easily collide, which can promote the mixing degree of the mixed gas.

[0032] Combined with reference Figure 5 The second spoiler assembly 10 includes a stirring rod 101 arranged in the mixing pipe section 2 and a fan blade 102 fixedly connected to the end of the stirring rod 101; the stirring rod 101 movably penetrates the spoiler plate 91 and is coaxially fixedly connected to the rotating shaft of the second ammonia injection pipe 81.

[0033] When the first ammonia spray atomization system 6 and the second ammonia spray atomization system 8 are rotating, the second ammonia spray pipe 81 can drive the fan blades 102 to rotate in the mixing pipe section 2 through the stirring rod 101. When the mixed gas rises above the spoiler 91, the fan blades 102 can stir the mixed gas while promoting the mixed gas to be discharged through the exhaust port 4. By stirring and mixing the mixed gas, the reaction effect of the flue gas and ammonia can be guaranteed, thereby improving the quality of flue gas denitrification in thermal power plants.

Claims

1. A flue gas denitrification and ammonia injection device for a thermal power plant, characterized in that: The invention comprises a clean smoke pipeline, wherein the clean smoke pipeline comprises an ammonia injection pipe section (1) and a mixing pipe section (2) fixedly connected to the top of the ammonia injection pipe section (1), the ammonia injection pipe section (1) is fixedly connected to a smoke inlet pipe (3), the top of the mixing pipe section (2) is provided with an exhaust port (4), a pair of fixed brackets (5) distributed up and down are fixedly connected in the ammonia injection pipe section (1), a first ammonia injection atomization system (6) is provided on the fixed bracket (5) located at the bottom, and the first ammonia injection atomization system (6) comprises a first ammonia injection pipe (61) rotatably connected to the bottom of the fixed bracket (5) by an axis, a plurality of first atomization nozzles (62) fixedly connected to the bottom of the first ammonia injection pipe (61), a rotary joint (63) provided at the middle end of the bottom of the first ammonia injection pipe (61), and a first ammonia injection nozzle (62) provided at the bottom of the first ammonia injection pipe (61). The end of the rotary joint (63) is fixed to an ammonia inlet pipe (64) passing through the ammonia injection pipe section (1); a rotating module (7) for driving the first ammonia injection pipe (61) to rotate is arranged on the fixed bracket (5) at the bottom; a second ammonia injection atomization system (8) is rotatably connected to the fixed bracket (5) at the top through an axis; the second ammonia injection atomization system (8) is communicated with the first ammonia injection pipe (61); the rotating module (7) is also used to drive the second ammonia injection atomization system (8) to rotate; a first spoiler component (9) is arranged in the mixing pipe section (2); a second spoiler component (10) is also arranged in the mixing pipe section (2); the second spoiler component (10) passes through the first spoiler component (9) and is coaxially fixedly connected to the second ammonia injection atomization system (8).

2. The ammonia injection device for flue gas denitration in a thermal power plant according to claim 1, characterized in that: The fixing bracket (5) is provided with a through slot (12).

3. The ammonia injection device for flue gas denitration in a thermal power plant according to claim 1, characterized in that: The rotating module (7) comprises a rotating motor (71) fixedly connected to a fixed bracket (5) located at the bottom, a first gear (72) fixedly connected to a power output end of the rotating motor (71), a second gear (73) meshingly connected to the first gear (72), and a hollow rotating rod (74) fixedly connected to the middle end of the second gear (73); the hollow rotating rod (74) is fixedly connected to the shaft of the first ammonia injection pipe (61), and the shaft is a hollow shaft.

4. The ammonia injection device for flue gas denitration in a thermal power plant according to claim 3, characterized in that: The second ammonia spray atomization system (8) comprises a second ammonia spray pipe (81) and a plurality of second atomization nozzles (82) fixedly connected to the bottom of the second ammonia spray pipe (81); the top end of the hollow rotating rod (74) is fixedly connected to the middle end position of the bottom of the second ammonia spray pipe (81); the second ammonia spray pipe (81) and the first ammonia spray pipe (61) are arranged in a vertical distribution.

5. The ammonia injection device for flue gas denitration in a thermal power plant according to claim 4, characterized in that: The first spoiler assembly (9) comprises a spoiler plate (91) fixedly connected to the mixing pipe section (2) and a plurality of spoiler inclined holes (92) provided on the spoiler plate (91).

6. The ammonia injection device for flue gas denitration in a thermal power plant according to claim 5, characterized in that: The second spoiler assembly (10) comprises a stirring rod (101) arranged in the mixing pipe section (2) and a fan blade (102) fixedly connected to the end of the stirring rod (101); the stirring rod (101) movably passes through the spoiler plate (91) and is coaxially fixedly connected to the rotating shaft of the second ammonia injection pipe (81).

7. The ammonia injection device for flue gas denitration in a thermal power plant according to claim 1, characterized in that: A filter plate (11) is fixedly connected inside the ammonia spray pipe section (1), and the filter plate (11) is located below the first ammonia spray atomization system (6) and above the flue gas inlet pipe (3).

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