Temperature adjusting and rectifying device of external SCR denitration system of boiler
By designing a vertical mixing flue and a double-layer rectifier unit in the boiler's external SCR denitrification system, the problem of uneven flue gas temperature regulation was solved, achieving stable control of flue gas temperature and improving denitrification efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-27
- Publication Date
- 2026-03-27
AI Technical Summary
In existing boiler external SCR denitrification systems, the distance between the high-temperature flue and the low-temperature flue is too short, resulting in uneven flue gas temperature regulation, making it difficult to achieve the denitrification set temperature requirements and reducing denitrification efficiency.
Design a temperature regulation and rectification device for an external SCR denitrification system in a boiler. It adopts a vertical mixing flue and a double-layer rectification unit. The flue gas mixing path is extended by staggering the X-axis and Y-axis rectification components. A flow guide and a temperature sensor are installed in the mixing flue to achieve closed-loop control of the flue gas temperature.
It achieves uniform mixing and stable control of flue gas temperature, ensuring that the flue gas temperature is within the optimal temperature range for denitrification, thereby improving the efficiency of the denitrification reaction.
Smart Images
Figure CN224040534U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a boiler SCR denitration system technical field, concretely relates to a boiler external SCR denitration system temperature regulating and rectifying device, and is suitable for existing boiler modification to adapt to external SCR denitration system. BACKGROUND
[0002] Boiler denitration refers to converting nitrogen oxides generated by boiler combustion into harmless nitrogen and water through various technical means, thereby reducing atmospheric pollutant emissions. With the enhancement of environmental protection consciousness and the increasingly stringent requirements of atmospheric control, denitration technology has been widely used in the field of boiler, and the currently feasible technologies mainly include selective catalytic reduction (SCR) technology and selective non-catalytic reduction (SNCR) technology.
[0003] In order to meet the requirements of environmental protection ultra-low emission, each heating company boiler selects the selective catalytic reduction (SCR) technology with higher and more stable denitration efficiency, but because the boiler is an existing fixed equipment, the denitration catalyst installation position is not set at the smoke outlet, so it is impossible to add the SCR denitration catalyst in the original boiler outlet flue, therefore, the external SCR denitration system is usually constructed outside the original boiler. The so-called external SCR denitration system can lead out high-temperature flue and low-temperature flue from the appropriate position of the boiler, and then mix the high-temperature flue gas and the low-temperature flue gas to a suitable temperature and lead into the SCR denitration device. However, the following problems exist:
[0004] The distance between the two leading flues of high-temperature flue and low-temperature flue and the SCR denitration device is short, that is, the reaction distance of the leading flue gas to the SCR catalyst is too short, so it is difficult to make the temperature of the flue gas reach the temperature deviation of less than 10% in the cross section, resulting in uneven temperature regulation and not meeting the set requirements, which reduces the denitration efficiency. CONTENT OF THE UTILITY MODEL
[0005] The utility model aims at providing a boiler external SCR denitration system temperature regulating and rectifying device which solves the above problems and has reasonable structure and reliable use. The high-temperature flue gas and the low-temperature flue gas are rapidly mixed in the mixing flue to meet the denitration temperature requirement, and the temperature of the flue gas to the SCR denitration device is uniform, so that the flue gas temperature is stable in the most suitable temperature range of denitration, thereby achieving the best denitration reaction efficiency.
[0006] The technical scheme of the utility model is as follows:
[0007] The utility model provides a boiler external SCR denitration system temperature regulating and rectifying device, including high temperature flue with boiler communication, low temperature flue, with high temperature flue and low temperature flue's end communication's mixed flue, its technical key point is: the mixed flue is vertical flue and is equipped with the curved pipeline to the external SCR denitration device in the top of vertical flue, first rectifying unit and second rectifying unit are equipped with in vertical flue along the vertical direction interval, first rectifying unit is located second rectifying unit below, and it is by the multiple rectifying components of interval arrangement along the width direction of mixed flue and is constituted, and the structural form of adjacent two rectifying components is different, and is X direction rectifying component and Y direction rectifying component respectively, X direction rectifying component is by X direction fixed column fixed in vertical flue, and X direction rectifying baffle is extended and fixed along X direction fixed column length direction and is constituted, X direction rectifying baffle is with horizontal plane and is set inclined angle, Y direction rectifying component is by X direction fixed column fixed in vertical flue, and Y direction rectifying baffle is fixed with X direction fixed column and is extended along Y direction and is constituted, Y direction rectifying baffle is with horizontal plane and is set inclined angle, second rectifying unit is by the multiple rectifying components of interval arrangement along the width direction of mixed flue and is constituted, and the structural form of adjacent two rectifying components is different, and is X direction rectifying component and Y direction rectifying component respectively, Y direction rectifying component of second rectifying unit and X direction rectifying component of first rectifying unit are arranged correspondingly up and down, and is equipped with the flow guide in the curved pipeline.
[0008] The boiler external SCR denitration system temperature regulating and rectifying device, the high temperature adjusting valve is equipped with in the high temperature flue, the low temperature adjusting valve is equipped with in the low temperature flue, the opening of high temperature adjusting valve and low temperature adjusting valve is adjusted further to control the temperature of flue in the set temperature.
[0009] The boiler external SCR denitration system temperature regulating and rectifying device, the temperature sensor is equipped with on the side wall above the first layer SCR catalyst filler of external SCR denitration device to feedback the temperature of flue as the adjusting basis.
[0010] The boiler external SCR denitration system temperature regulating and rectifying device, the X direction rectifying baffle and Y direction rectifying baffle are rectangular baffle respectively.
[0011] The boiler external SCR denitration system temperature regulating and rectifying device, the both ends of X direction fixed column are fixedly connected with the inner wall of vertical flue respectively, the center line of X direction rectifying baffle of X direction rectifying component is arranged with the X direction fixed column fixed, the X direction fixed column of Y direction rectifying component is arranged with Y direction rectifying baffle fixed.
[0012] The boiler external SCR denitration system temperature regulating and rectifying device, the set inclined angle of X direction rectifying baffle with horizontal plane is 45 DEG, and the set inclined angle of Y direction rectifying baffle with horizontal plane is 45 DEG.
[0013] The temperature adjusting and rectifying device of the boiler external SCR denitration system has the arc-shaped flow guide plates which form upper and lower flue gas passages in the curved pipeline.
[0014] The utility model discloses beneficial effect is:
[0015] 1. The utility model discloses the double -deck rectifying unit is established at the inlet position of high -low temperature mixed flue, and the X -direction rectifying assembly of two -deck rectifying unit is staggered distribution, and the Y -direction rectifying assembly of second rectifying unit and the X -direction rectifying assembly of first rectifying unit are arranged and distribute correspondingly up and down. The mixing path of high -low temperature flue gas is prolonged through two -deck rectifying unit, and it is favorable to the mixing of high -low temperature flue gas even, to reach the denitration set temperature requirement, make the smoke temperature stable in the most suitable temperature interval of denitration, to reach the best denitration reaction efficiency.
[0016] 2. The utility model discloses the flow guide piece is set up in the curved pipeline of mixed flue, and makes mixed flue gas flow rate even above SCR catalyst.
[0017] 3. The utility model discloses through setting up temperature sensor, measures mixed even after flue gas temperature and set temperature interval contrast, to feedback regulation high -temperature regulating valve and low -temperature regulating valve's opening, realizes closed -loop control. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 It is the structural schematic diagram of the utility model discloses;
[0019] Figure 2 It is Figure 1 The left view of first rectifying unit and second rectifying unit arrangement structure in mixed flue in
[0020] Figure 3 It is Figure 1 The overhead view of first rectifying unit arrangement structure in mixed flue in
[0021] Figure 4 It is Figure 1 The overhead view of second rectifying unit arrangement structure in mixed flue in.
[0022] In the drawing: 1. boiler, 2. low -temperature flue, 3. low -temperature regulating valve, 4. high -temperature flue, 5. high -temperature regulating valve, 6. X -direction rectifying assembly, 7. Y -direction rectifying assembly, 8. mixed flue, 9. flow guide piece, 10. curved pipeline, 11. temperature sensor, 12. external SCR denitration device, 13. SCR catalyst packing, 14. X -direction fixed column, 15. Y -direction rectifying baffle, 16. X -direction rectifying baffle. DETAILED DESCRIPTION
[0023] The utility model will be described in detail below in conjunction with the drawings.
[0024] AsFigures 1-4 As shown, the boiler external SCR denitration system temperature regulating and flow regulating device comprises a high-temperature flue 4, a low-temperature flue 2 in communication with the boiler 1, and a mixed flue 8 in communication with the ends of the high-temperature flue 4 and the low-temperature flue 2.
[0025] The mixed flue 8 is a vertical flue, and the top end of the vertical flue is provided with a curved pipeline 10 leading to the external SCR denitration device 12. First and second flow regulating units are arranged in the vertical flue in the vertical direction. The first flow regulating unit is located below the second flow regulating unit.
[0026] The first flow regulating unit is composed of a plurality of flow regulating components arranged in the width direction of the mixed flue 8. Adjacent two flow regulating components are different in structure and are respectively an X-direction flow regulating component 6 and a Y-direction flow regulating component 7. The X-direction flow regulating component 6 is composed of an X-direction fixed column 14 fixed in the vertical flue and an X-direction flow regulating baffle 16 extending along the length direction of the X-direction fixed column 14 and fixed. The X-direction flow regulating baffle 16 is at a set inclined angle with the horizontal plane. The Y-direction flow regulating component 7 is composed of the X-direction fixed column 14 fixed in the vertical flue and a Y-direction flow regulating baffle 15 fixed with the X-direction fixed column 14 and extending in the Y-direction. The Y-direction flow regulating baffle 15 is at a set inclined angle with the horizontal plane.
[0027] The second flow regulating unit is composed of a plurality of flow regulating components arranged in the width direction of the mixed flue 8. Adjacent two flow regulating components are different in structure and are respectively an X-direction flow regulating component 6 and a Y-direction flow regulating component 7. The Y-direction flow regulating component 7 of the second flow regulating unit and the X-direction flow regulating component 6 of the first flow regulating unit are arranged in correspondence with each other in the up-down direction.
[0028] In this embodiment, the X-direction flow regulating baffle 16 and the Y-direction flow regulating baffle 15 are respectively rectangular baffles. The two ends of the X-direction fixed column 14 are respectively fixedly connected with the inner wall of the vertical flue. The center line of the X-direction flow regulating baffle 16 of the X-direction flow regulating component 6 is arranged to be fixed with the X-direction fixed column 14. The X-direction fixed column 14 of the Y-direction flow regulating component 7 penetrates the center of the Y-direction flow regulating baffle 15 and is fixed with the Y-direction flow regulating baffle 15. The set inclined angle of the X-direction flow regulating baffle 16 with the horizontal plane is 45°, and the set inclined angle of the Y-direction flow regulating baffle 15 with the horizontal plane is 45°.
[0029] The curved pipeline 10 is provided with a flow guide 9. In this embodiment, the flow guide 9 is an arc-shaped flow guide plate, which forms upper and lower flue gas passages in the curved pipeline 10.
[0030] In the embodiment, the high-temperature flue 4 is provided with a high-temperature adjusting valve 5, and the low-temperature flue 2 is provided with a low-temperature adjusting valve 3, and the opening degree of the high-temperature adjusting valve 5 and the low-temperature adjusting valve 3 is adjusted to further control the flue temperature within the set temperature. The external SCR denitration device 12 is provided with a temperature measuring sensor 11 on the side wall above the first layer of SCR catalyst filler 13 to feed back the flue temperature as the adjusting basis.
[0031] Working principle:
[0032] The first rectifying unit and the second rectifying unit are arranged at the inlet of the mixed flue 8. The high-temperature flue gas and the low-temperature flue gas are mixed together after the flow guiding, flow disturbing and flow rectifying of the first rectifying unit and the second rectifying unit, and the flue temperature is uniform. Then the flue gas flows to the above of the SCR catalyst through the flow guiding member 9. The temperature measuring sensor 11 feeds back according to the set temperature and the temperature measuring ratio, and automatically adjusts the opening degree of the high-temperature adjusting valve 5 and the low-temperature adjusting valve 3 to further adjust the flue temperature, so as to ensure that the flue temperature above the SCR catalyst is controlled within the set temperature.
[0033] The above embodiment of the utility model is described in detail, but the content can only be the preferred embodiment of the utility model, and cannot be considered as limiting the scope of the utility model. Any equivalent change and improvement within the scope of the utility model is still within the scope of the patent.
Claims
1. A boiler external SCR denitration system temperature regulating and flow regulating device, comprising a high-temperature flue in communication with a boiler, a low-temperature flue, and a mixed flue in communication with the ends of the high-temperature flue and the low-temperature flue, characterized in that: The mixed flue is a vertical flue, and a curved pipeline leading to an external SCR denitration device is arranged at the top end of the vertical flue; the first rectifying unit and the second rectifying unit are arranged in the vertical flue in the vertical direction; the first rectifying unit is arranged below the second rectifying unit and is composed of a plurality of rectifying components arranged in the width direction of the mixed flue; the structure of adjacent two rectifying components is different, and the two rectifying components are an X-direction rectifying component and a Y-direction rectifying component; the X-direction rectifying component is composed of an X-direction fixed column fixed in the vertical flue and an X-direction rectifying baffle extending along the length direction of the X-direction fixed column and fixed; the X-direction rectifying baffle is arranged at a set inclination angle with the horizontal plane; the Y-direction rectifying component is composed of an X-direction fixed column fixed in the vertical flue and a Y-direction rectifying baffle fixed with the X-direction fixed column and extending in the Y direction; the Y-direction rectifying baffle is arranged at a set inclination angle with the horizontal plane; the second rectifying unit is composed of a plurality of rectifying components arranged in the width direction of the mixed flue; the structure of adjacent two rectifying components is different, and the two rectifying components are an X-direction rectifying component and a Y-direction rectifying component; the Y-direction rectifying component of the second rectifying unit and the X-direction rectifying component of the first rectifying unit are arranged in the upper and lower directions and correspond to each other; and a flow guide is arranged in the curved pipeline.
2. The temperature adjusting and flow regulating device for boiler external SCR denitration system according to claim 1, characterized in that: The high-temperature flue is provided with a high-temperature regulating valve, and the low-temperature flue is provided with a low-temperature regulating valve.
3. The temperature adjusting and flow regulating device for boiler external SCR denitration system according to claim 1, characterized in that: A temperature measuring sensor is arranged on the side wall above the first layer of SCR catalyst fillers of the external SCR denitration device.
4. The temperature adjusting and flow regulating device for boiler external SCR denitration system according to claim 1, characterized in that: The X-direction rectifying baffle and the Y-direction rectifying baffle are rectangular baffles.
5. The temperature adjusting and flow regulating device for boiler external SCR denitration system according to claim 1, characterized in that: The two ends of the X-direction fixed column are fixedly connected with the inner wall of the vertical flue; the center line of the X-direction rectifying baffle of the X-direction rectifying component is fixed with the X-direction fixed column; and the X-direction fixed column of the Y-direction rectifying component penetrates the center of the Y-direction rectifying baffle and is fixed with the Y-direction rectifying baffle.
6. The temperature adjusting and flow regulating device for boiler external SCR denitration system according to claim 1, characterized in that: The set inclination angle of the X-direction rectifying baffle with the horizontal plane is 45°, and the set inclination angle of the Y-direction rectifying baffle with the horizontal plane is 45°.
7. The temperature adjusting and flow regulating device for boiler external SCR denitration system according to claim 1, characterized in that: The flow guide is an arc-shaped flow guide plate, and the arc-shaped flow guide plate forms upper and lower flue gas passages in the curved pipeline.