SCR (Selective Catalytic Reduction) denitration ammonia supply device

Abstract

The utility model discloses an SCR (Selective Catalytic Reduction) denitration ammonia supply device which comprises at least two communicating pipelines arranged in parallel, one end of each communicating pipeline is communicated with an ammonia feeding pipe, the other end of each communicating pipeline is communicated with a mixer, and the communicating pipeline between the ammonia feeding pipe and the mixer is sequentially provided with a regulating valve, a mass flow meter and a control valve. According to the SCR denitration ammonia supply device disclosed by the utility model, at least two parallel communicating pipelines are arranged, so that the redundancy design of the ammonia supply pipes is realized, and the switching and maintenance of the pipelines are convenient to realize, and therefore, the ammonia supply device can always keep normal operation, and the stable operation and good adaptability of the whole ammonia supply system can be ensured; meanwhile, under the combined action of the branch, the branch valve, the connecting path, the connecting valve, the temperature controller, the heat tracing band and the air pipe, stable operation of the ammonia supply device can be ensured, switching and overhauling of pipelines can be conveniently achieved, the ammonia supply efficiency is remarkably improved, and meanwhile the requirement of denitration reaction can be better met.

Description

Technical Field

[0001] This utility model belongs to the field of flue gas denitrification and ammonia supply technology, and relates to an SCR denitrification and ammonia supply device. Background Technology

[0002] In the smelting process of a metallurgical plant, the sintering process emits large volumes of flue gas with a wide variety of pollutants at high concentrations. The main pollutants in the sintering flue gas include nitrogen oxides, sulfides, heavy metals, and dust, which can cause significant pollution to the surrounding atmosphere. Currently, the SCR (Selective Catalytic Reduction) method is widely used for denitrification treatment of rotary kiln flue gas in metallurgical plants.

[0003] Traditional ammonia supply systems typically employ a single-pipe design for the ammonia delivery pipeline. If a problem occurs in this pipeline, the entire ammonia supply system may be affected, leading to decreased denitrification efficiency or even system shutdown. Furthermore, existing ammonia supply systems lack effective heat tracing and insulation measures for the delivery pipeline, which can cause ammonia gas to condense in the pipeline at low temperatures, affecting the stability of the ammonia supply and denitrification efficiency. Therefore, this invention proposes an SCR denitrification ammonia supply device to solve the above problems. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an SCR denitrification and ammonia supply device to address the shortcomings of the existing technology.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution.

[0006] An SCR denitrification ammonia supply device includes at least two parallel connecting pipelines, one end of each connecting pipeline is connected to an ammonia supply pipe, and the other end is connected to a mixer; a regulating valve, a mass flow meter, and a control valve are sequentially provided on the connecting pipeline between the ammonia supply pipe and the mixer.

[0007] As a further improvement to the above technical solution: each of the connecting pipelines is also connected to a branch, and the two ends of the branch are located on both sides of the control valve.

[0008] As a further improvement to the above technical solution: a branch valve is provided on the branch.

[0009] As a further improvement to the above technical solution: at least one connecting path is provided between two adjacent connecting pipelines; the two ends of the connecting path are connected to the connecting pipeline between the mass flow meter and the mixer.

[0010] As a further improvement to the above technical solution: the connecting path is equipped with a connecting valve.

[0011] As a further improvement to the above technical solution, a bypass passage is also provided on the connecting pipes at both ends of the mass flow meter.

[0012] As a further improvement to the above technical solution: a bypass valve is provided on the bypass passage.

[0013] As a further improvement to the above technical solution: the inlet end of the ammonia delivery pipe is connected to a urea reactor for providing an ammonia source.

[0014] As a further improvement to the above technical solution: the ammonia delivery pipe is connected to the outlet end of the urea reactor via a flange.

[0015] As a further improvement to the above technical solution: the ammonia delivery pipe is provided with a pipe ring on the outside.

[0016] As a further improvement to the above technical solution: the ammonia delivery pipe is provided with an external mounting base.

[0017] As a further improvement to the above technical solution: the mounting base is located between the flange and the pipe ring.

[0018] As a further improvement to the above technical solution: a temperature controller is installed on the mounting base.

[0019] As a further improvement to the above technical solution: the ammonia delivery pipe is wrapped with a heating tape for heating the ammonia delivery pipe.

[0020] As a further improvement to the above technical solution: the heat tracing cable is electrically connected to the output terminal of the temperature controller.

[0021] As a further improvement to the above technical solution: an air pipe is connected to the mixer.

[0022] As a further improvement to the above technical solution: the air pipe is located at the top of the mixer.

[0023] As a further improvement to the above technical solution: a denitrification reactor is connected to the mixer.

[0024] Compared with the prior art, the advantages of this utility model are:

[0025] (1) In view of the shortcomings of existing ammonia supply devices, such as difficulty in ensuring the stable operation of the entire ammonia supply system and poor adaptability, this utility model provides an SCR denitrification ammonia supply device. By setting at least two parallel connecting pipelines, the redundancy design of the ammonia supply pipe is realized, which facilitates the switching and maintenance of the pipeline. This allows the ammonia supply device to always maintain normal operation, thereby ensuring the stable operation of the entire ammonia supply system and good adaptability.

[0026] (2) In this utility model, by setting a temperature controller and a heating cable for heating the ammonia delivery pipe, the ammonia delivery pipe can be heated by the heating cable under the control of the temperature controller. This ensures that the ammonia delivery pipe is always used under a high temperature condition, thereby avoiding the condensation of ammonia in the pipe and improving the stability of ammonia supply and denitrification efficiency.

[0027] (3) In this utility model, by setting branch lines and branch valves, connecting lines and connecting valves, and cooperating with the design of multiple connecting pipelines, it is more convenient to realize pipeline switching and maintenance. When the mass flow meter on a pipeline is blocked, the connecting valve is opened, so that the mixer on the connecting pipeline where the blocked mass flow meter is located is supplied with ammonia gas output from the mass flow meter on the adjacent pipeline, thereby keeping the mixer on the connecting pipeline where the blocked mass flow meter is located working normally, ensuring the stability of ammonia supply and denitrification efficiency. Attached Figure Description

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0029] Figure 1 This is a schematic diagram of the SCR denitrification and ammonia supply device in an embodiment of this utility model.

[0030] Figure 2 for Figure 1 A magnified view of point A.

[0031] Figure 3 for Figure 1 Enlarged view of point B.

[0032] Legend:

[0033] 1. Connecting pipeline; 2. Ammonia supply pipeline; 3. Regulating valve; 4. Mass flow meter; 5. Branch line; 6. Branch valve; 7. Control valve; 8. Connecting line; 9. Connecting valve; 10. Mixer; 11. Air pipe; 12. Denitrification reactor; 201. Flange; 202. Pipe ring. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention.

[0035] Example

[0036] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0037] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "symmetry", "third phase", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] To address the shortcomings of existing ammonia supply devices, such as difficulty in ensuring stable operation of the entire ammonia supply system and poor adaptability, this utility model provides an SCR denitrification ammonia supply device. By setting at least two parallel connecting pipelines, a redundant design for the ammonia supply pipes is achieved, facilitating pipeline switching and maintenance. This ensures that the ammonia supply device always maintains normal operation, thereby guaranteeing the stable operation of the entire ammonia supply system and providing good adaptability. Details are as follows:

[0039] like Figures 1 to 3 As shown, the SCR denitrification ammonia supply device of this embodiment includes two parallel connecting pipelines 1. One end of each connecting pipeline 1 is connected to an ammonia supply pipe 2, and the other end is connected to a mixer 10. A regulating valve 3, a mass flow meter 4, and a control valve 7 are sequentially provided on the connecting pipeline 1 between the ammonia supply pipe 2 and the mixer 10.

[0040] In this embodiment, each connecting pipe 1 is also connected to a branch pipe 5, and the two ends of the branch pipe 5 are located on both sides of the control valve 7; a branch valve 6 is provided on the branch pipe 5.

[0041] In this embodiment, at least one connecting line 8 is provided between two adjacent connecting pipes 1; the two ends of the connecting line 8 are connected to the connecting pipe 1 between the mass flow meter 4 and the mixer 10; the connecting line 8 is provided with a connecting valve 9.

[0042] In this embodiment, a bypass passage is also provided on the connecting pipe 1 at both ends of the mass flow meter 4, and a bypass valve is provided on the bypass passage.

[0043] In this embodiment, the inlet end of the ammonia supply pipe 2 is connected to a urea reactor 16 for providing an ammonia source. In the urea reactor 16, urea can be converted into ammonia gas to provide an ammonia source for the ammonia supply system.

[0044] In this embodiment, the ammonia supply pipe 2 is connected to the outlet end of the urea reactor 16 via flange 201.

[0045] In this embodiment, a pipe ring 202 is provided on the outside of the ammonia delivery pipe 2, and a mounting seat 13 is provided on the outside of the ammonia delivery pipe 2. The mounting seat 13 is located between the flange 201 and the pipe ring 202, and a temperature controller 14 is installed on the mounting seat 13.

[0046] In this embodiment, a heating cable 15 for heating the ammonia delivery pipe 2 is wrapped around the outside of the pipe, and the heating cable 15 is electrically connected to the output end of the temperature controller 14.

[0047] In this invention, the temperature of the ammonia supply pipe 2 can be monitored and adjusted under the combined action of the temperature controller 14 and the heating tape 15 to ensure that the ammonia flows at a suitable temperature. When the ammonia condenses into a liquid state under the low temperature environment, the heating tape 15 heats the ammonia supply pipe 2 under the control of the temperature controller 14 to prevent the ammonia from condensing and to ensure the stability of the ammonia supply and the denitrification efficiency.

[0048] In this embodiment, an air pipe 11 is connected to the mixer 10, specifically, the air pipe 11 is located at the top of the mixer 10. In this invention, the introduction of the air pipe 11 helps to mix ammonia with air, making the ammonia mixture in the mixer 10 more uniform, which is beneficial to improving the denitrification efficiency. Furthermore, by adjusting the air intake of the air pipe 11, the oxygen content in the mixer 10 can be controlled to meet the requirements of the denitrification reaction and ensure the stable operation of the entire system.

[0049] In this embodiment, a denitrification reactor 12 is connected to the mixer 10.

[0050] The specific method of using the SCR denitrification ammonia supply device of this utility model is as follows:

[0051] In operation, urea is converted into ammonia in urea reactor 16, providing a stable ammonia source for the ammonia supply system. The ammonia enters the SCR denitrification ammonia supply unit through ammonia delivery pipe 2. A flange 201 is welded to one end of ammonia delivery pipe 2 for easy connection to the ammonia source or other equipment. A pipe ring 202 and a mounting base 13 are provided on the outside of ammonia delivery pipe 2. A temperature controller 14 and a heating tape 15 are fixedly installed on the mounting base 13. The temperature controller 14 can monitor and adjust the temperature of ammonia delivery pipe 2 to ensure that ammonia flows at a suitable temperature. In particular, in low-temperature environments, the heating tape 15 heats ammonia delivery pipe 2 under the control of the temperature controller 14 to prevent ammonia condensation. When ammonia enters the connecting pipe 1 from ammonia delivery pipe 2, it first undergoes flow regulation through regulating valve 3. Regulating valve 3 precisely controls the flow into the system according to the requirements of denitrification reactor 12 and the instructions of the automatic control system. The ammonia flow rate is measured by a mass flow meter 4, which provides accurate flow data to help operators monitor and adjust the ammonia supply. After adjustment and measurement, the ammonia enters a control valve 7, which further regulates the ammonia flow rate and sends it into a mixer 10. In the mixer 10, the ammonia is mixed with air introduced through an air pipe 11. The introduction of air through the air pipe 11 helps to uniformly mix the ammonia and air, improving the denitrification efficiency. At the same time, by adjusting the air intake of the air pipe 11, the oxygen content in the mixer 10 can be controlled to meet the requirements of the denitrification reaction. The mixed ammonia enters the denitrification reactor 12 through a pipeline. In the denitrification reactor 12, the mixed gas reacts with NOx in the flue gas under the action of a catalyst to generate nitrogen and water, thereby reducing NOx emissions. More importantly, to increase the system's reliability and flexibility, both connecting pipe 1 and branch pipe 5 can flow with ammonia. Under normal circumstances, connecting pipe 1 flows with ammonia, while branch pipe 5 is normally closed. When connecting pipe 1 malfunctions, ammonia flows through branch pipe 5. Connecting pipe 1 is equipped with a control valve 7 for regulating the switch, controlling the opening and closing of connecting pipe 1. Branch pipe 5 is equipped with a branch valve 6 for controlling the opening and closing. Under normal circumstances, control valve 7 on connecting pipe 1 remains open, controlling the ammonia flow rate, and adjusting the flow based on data detected by mass flow meter 4. When maintenance is required on control valve 7 or branch valve 6, the corresponding control valve 7 or branch valve 6 can be closed. When the mass flow meter 4 on a connecting pipeline 1 is working normally, the connecting valve 9 remains closed, and ammonia gas directly enters the mixer 10 through its respective connecting pipeline 1 and then enters the denitrification reactor 12 for reaction. When the mass flow meter 4 on a connecting pipeline 1 is blocked, the connecting valve 9 is opened, allowing the mixer 10 on the connecting pipeline 1 where the blocked mass flow meter 4 is located to be supplied with ammonia gas output from the mass flow meter 4 on the adjacent pipeline, ensuring the stability of ammonia supply and denitrification efficiency.Therefore, in this utility model, by setting branch 5 and branch valve 6, connecting line 8 and connecting valve 9, and cooperating with the design of multiple connecting pipelines 1, it is more convenient to realize pipeline switching and maintenance. When the mass flow meter 4 on one pipeline is blocked, the connecting valve 9 is opened, so that the mixer 10 on the connecting pipeline 1 where the blocked mass flow meter 4 is located is supplied with ammonia gas output from the mass flow meter 4 on the adjacent pipeline. This ensures that the mixer 10 on the connecting pipeline 1 where the blocked mass flow meter 4 is located continues to work normally, ensuring the stability of ammonia supply and denitrification efficiency.

[0052] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present utility model using the methods and techniques disclosed above, or modify it into equivalent embodiments with equivalent changes, without departing from the spirit and technical solution of the present utility model. Therefore, any simple modifications, equivalent substitutions, equivalent changes and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the content of the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. An SCR denitrification ammonia supply device, characterized in that, It includes at least two parallel connecting pipelines (1), one end of each connecting pipeline (1) is connected to an ammonia supply pipe (2), and the other end is connected to a mixer (10); the connecting pipeline (1) between the ammonia supply pipe (2) and the mixer (10) is provided with a regulating valve (3), a mass flow meter (4) and a control valve (7) in sequence.

2. The SCR denitrification ammonia supply device according to claim 1, characterized in that, Each of the connecting pipes (1) is also connected to a branch (5), the two ends of which are located on both sides of the control valve (7); a branch valve (6) is provided on the branch (5).

3. The SCR denitrification ammonia supply device according to claim 2, characterized in that, At least one connecting path (8) is provided between two adjacent connecting pipes (1); both ends of the connecting path (8) are connected to the connecting pipe (1) between the mass flow meter (4) and the mixer (10); the connecting path (8) is provided with a connecting valve (9).

4. The SCR denitrification ammonia supply device according to claim 3, characterized in that, A bypass passage is also provided on the connecting pipe (1) at both ends of the mass flow meter (4); a bypass valve is provided on the bypass passage.

5. The SCR denitrification ammonia supply device according to any one of claims 1 to 4, characterized in that, The inlet end of the ammonia delivery pipe (2) is connected to a urea reactor (16) for providing ammonia source; the outlet end of the ammonia delivery pipe (2) and the urea reactor (16) are connected by a flange (201).

6. The SCR denitrification ammonia supply device according to claim 5, characterized in that, The ammonia delivery pipe (2) is provided with a pipe ring (202) on the outside; the ammonia delivery pipe (2) is provided with a mounting seat (13) on the outside; the mounting seat (13) is located between the flange (201) and the pipe ring (202); a temperature controller (14) is installed on the mounting seat (13).

7. The SCR denitrification ammonia supply device according to claim 6, characterized in that, The ammonia delivery pipe (2) is wrapped with a heating cable (15) for heating the ammonia delivery pipe (2); the heating cable (15) is electrically connected to the output end of the temperature controller (14).

8. The SCR denitrification ammonia supply device according to any one of claims 1 to 4, characterized in that, An air pipe (11) is connected to the mixer (10).

9. The SCR denitrification ammonia supply device according to claim 8, characterized in that, The air pipe (11) is located on top of the mixer (10).

10. The SCR denitrification ammonia supply device according to claim 8, characterized in that, The mixer (10) is connected to a denitrification reactor (12).

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