Low-temperature denitration structure for tunnel kiln flue

Abstract

The utility model discloses a tunnel kiln flue low-temperature denitration structure which comprises a tunnel kiln denitration reaction chamber, a low-temperature denitration device is arranged in the tunnel kiln denitration reaction chamber, the low-temperature denitration device comprises a rotatable arc-shaped spray pipe set, and the arc-shaped spray pipe set comprises a plurality of arc-shaped spray pipes arranged in an array mode in the length direction of a tunnel kiln. Denitration liquid conveying pipelines are connected among the plurality of arc-shaped spray pipes, and spray heads are uniformly distributed on the arc-shaped spray pipes; arc-shaped fluted discs matched with the arc-shaped spray pipes are fixed to the outer sides of the two arc-shaped spray pipes located at the two ends of the tunnel kiln denitration reaction chamber, the lower ends of the same sides of the two arc-shaped fluted discs are meshed with gear sets driven by servo motors respectively, check blocks are fixed to the two free ends of the arc-shaped fluted discs respectively, and sensing elements electrically connected with the servo motors are installed on the check blocks. According to the low-temperature denitration structure for the tunnel kiln flue, low-temperature denitration treatment on flue gas in a tunnel kiln is achieved through the reasonable structure and arrangement of the induction mechanism, the control mechanism and the execution mechanism, and the low-temperature denitration structure has the advantages of being high in automation degree, good in denitration effect and the like.

Description

Technical fields:

[0001] This utility model relates to the field of denitrification technology in tunnel kilns, and in particular to a low-temperature denitrification structure for tunnel kiln flues. Background technology:

[0002] High-temperature spray denitrification liquid is not suitable for use in the high-temperature zone of tunnel kiln. The sprayed urea liquid will affect the sintering process, quality and environmental factors of bricks. The high-temperature combustion zone of the kiln is relatively long (about 12 meters in general working conditions). The flue gas in the high-temperature zone flows backward from the gaps between the stacked bricks in various directions. Therefore, the point of nitrogen oxide generation cannot be determined. Spraying can only be done in a certain area. The sprayed denitrification liquid cannot come into contact with the flue gas in the whole area.

[0003] The high-temperature combustion section inside the tunnel kiln is filled with multiple layers of brick products. Unlike a boiler, the interior is not spacious, so the reducing agent cannot fully contact the nitrogen oxides and cannot achieve the denitrification effect.

[0004] The structure of brick-making tunnel kilns determines that the oxidation level is generally high (around 19.5%), and the denitrification effect is best when the oxygen content is controlled at around 18.5%.

[0005] The flue gas temperature in the high-temperature sintering section is between 120-180°C before being sent to the drying chamber by the waste heat fan, and between 50-80°C after passing through the drying area of ​​the brick blanks.

[0006] Based on the characteristics of tunnel kilns mentioned above, traditional SNCR (urea) non-catalytic reduction denitrification and SCR catalytic reduction denitrification methods are ineffective. SNCR denitrification is ineffective, and SCR denitrification cannot achieve good denitrification results due to the low temperature. Utility model content:

[0007] This invention provides a low-temperature denitrification structure for tunnel kiln flues, which solves the problem of poor denitrification effect in the prior art.

[0008] The technical solution of this utility model is as follows: A low-temperature denitrification structure for a tunnel kiln flue includes a tunnel kiln denitrification reaction chamber. A trolley track is laid at the bottom of the tunnel kiln denitrification chamber. A low-temperature denitrification device is installed in the tunnel kiln denitrification chamber. The low-temperature denitrification device includes a rotatable arc-shaped spray pipe assembly. The arc-shaped spray pipe assembly includes multiple arc-shaped spray pipes arranged in an array along the length of the tunnel kiln. A denitrification liquid conveying pipeline is connected between the multiple arc-shaped spray pipes. Nozzles are evenly distributed on the arc-shaped spray pipes.

[0009] Two arc-shaped nozzles located at both ends of the denitrification reaction chamber of the tunnel kiln are fixed with arc-shaped gear discs that cooperate with the arc-shaped nozzles on their outer sides. The lower ends of the two arc-shaped gear discs on the same side are respectively meshed with gear sets driven by servo motors. Rail clamps that cooperate with the surface of the arc-shaped gear discs are fixed on both sides of the gear sets. Stop blocks are fixed at the two free ends of the arc-shaped gear discs, and sensing elements that are electrically connected to the servo motors are installed on the stop blocks.

[0010] Preferably, the device also includes a device control host, which is electrically connected to the sensing element.

[0011] Preferably, the denitrification liquid delivery pipeline is connected in sequence to a denitrification liquid storage tank and a denitrification liquid dilution tank. The denitrification liquid dilution tank is connected to a denitrification raw liquid pipe and a tap water dilution pipe. A metering pump is installed on the denitrification raw liquid pipe and the tap water dilution pipe. The metering pump is electrically connected to the equipment control host.

[0012] Preferably, the denitrification reaction chamber of the tunnel kiln is equipped with a flue gas concentration sensor and a temperature sensor.

[0013] Preferably, the device control host is equipped with a metering and distribution module connected to the metering pump and a spray control module connected to the nozzle.

[0014] Preferably, the metering pump is electrically connected to the flue gas concentration sensor and the temperature sensor via a metering and distribution module; the nozzle is electrically connected to the flue gas concentration sensor and the temperature sensor via a spray control module.

[0015] The beneficial effects of this utility model are as follows: The low-temperature denitrification structure of the tunnel kiln flue of this utility model sets the tunnel kiln denitrification reaction chamber as the core area for treating flue gas, and the trolley track laid at the bottom is used to support and move the kiln car to ensure the smooth operation of the production process; the low-temperature denitrification device adopts a rotatable arc-shaped spray pipe assembly to achieve efficient coverage of the stacked sintered bricks. Multiple arc-shaped spray pipes are arranged in an array along the length of the tunnel kiln, which can fully cover the flow path of the flue gas in the kiln, ensuring full contact and reaction between the denitrification liquid and the flue gas. Each arc-shaped spray pipe is evenly distributed with nozzles, which can achieve uniform spraying of the denitrification liquid and improve the denitrification efficiency; since the spray pipe assembly is driven by an arc-shaped toothed disc and a servo motor to achieve rotation, the spraying angle and range can be flexibly adjusted according to the flue gas flow to adapt to different production conditions. The arc-shaped nozzle assembly adopts a high-precision, high-reliability and easy-to-control structure, which can ensure that the arc-shaped nozzle assembly rotates according to the preset program and parameters, thereby achieving the best denitrification effect. After the denitrification operation is completed, the arc-shaped nozzle assembly returns to the position where the opening is at the bottom, without affecting the entry and exit of the kiln car.

[0016] The equipment control host is electrically connected to the sensing element, which can monitor the rotation position of the arc-shaped toothed disc in real time. The denitrification liquid delivery pipeline connects sequentially to the denitrification liquid storage tank and the denitrification liquid dilution tank. The denitrification liquid dilution tank receives raw denitrification liquid and water through a raw denitrification liquid pipe and a tap water dilution pipe to prepare the diluted denitrification liquid. Metering pumps are installed on the raw denitrification liquid pipe and the tap water dilution pipe to precisely control the addition of the two liquids. The metering pumps are electrically connected to the equipment control host and can adjust the pumping rate according to the host's instructions. A flue gas concentration sensor and a temperature sensor are also installed in the tunnel kiln denitrification reaction chamber to monitor the flue gas concentration and temperature in real time. These parameters are used to adjust the denitrification liquid ratio and the nozzle spray.

[0017] In summary, the low-temperature denitrification structure for tunnel kiln flue gas of this utility model, through the reasonable arrangement of structure, sensing, control and actuators, achieves low-temperature denitrification treatment of flue gas in tunnel kilns, and has the advantages of high automation, good denitrification effect and strong adaptability. Attached image description:

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a schematic diagram illustrating the principle of this utility model.

[0020] In the diagram: 1. Tunnel kiln denitrification chamber; 2. Low-temperature denitrification device; 2-1. Arc-shaped nozzle; 2-2. Denitrification liquid delivery pipeline; 2-3. Nozzle; 2-4. Arc-shaped gear disc; 2-5. Stop block; 3. Servo motor; 4. Gear set; 5. Equipment control host; 6. Denitrification liquid storage tank; 7. Denitrification liquid dilution tank; 8. Metering pump; 9. Metering and distribution module; 10. Injection control module; 11. Flue gas concentration sensor; 12. Temperature sensor. Detailed implementation method:

[0021] Combined with appendix Figure 1 , 2 The present invention provides a further description of a low-temperature denitrification structure for a tunnel kiln flue.

[0022] The present invention relates to a low-temperature denitrification structure for a tunnel kiln flue, comprising a tunnel kiln denitrification reaction chamber 1, a trolley track laid at the bottom of the tunnel kiln denitrification chamber 1, a low-temperature denitrification device 2 installed in the tunnel kiln denitrification chamber, the low-temperature denitrification device 2 comprising a rotatable arc-shaped nozzle assembly, the arc-shaped nozzle assembly comprising multiple arc-shaped nozzles 2-1 arranged in an array along the length of the tunnel kiln, the multiple arc-shaped nozzles 2-1 being connected by a denitrification liquid conveying pipeline 2-2, and nozzles 2-3 evenly distributed on the arc-shaped nozzles 2-1;

[0023] Two arc-shaped nozzles 2-1 located at both ends of the denitrification reaction chamber 1 of the tunnel kiln are fixed with arc-shaped toothed discs 2-4 that cooperate with the arc-shaped nozzles 2-1. The lower ends of the two arc-shaped toothed discs 2-4 on the same side are respectively meshed with gear sets 4 driven by servo motors 3. Rail clamps that cooperate with the disc surface of the arc-shaped toothed discs 2-4 are fixed on both sides of the gear sets 4. Stop blocks 2-5 are fixed on the two free ends of the arc-shaped toothed discs 2-4 respectively. Sensing elements that are electrically connected to the servo motors 3 are installed on the stop blocks 2-5.

[0024] Furthermore, it also includes a device control host 5, which is electrically connected to the sensing element.

[0025] Furthermore, the denitrification liquid delivery pipeline 2-2 is sequentially connected to the denitrification liquid storage tank 6 and the denitrification liquid dilution tank 7. The denitrification liquid dilution tank 7 is connected to the denitrification raw liquid pipe and the tap water dilution pipe. The denitrification raw liquid pipe and the tap water dilution pipe are equipped with metering pumps 8, and the metering pumps 8 are electrically connected to the equipment control host 5.

[0026] Furthermore, the denitrification reaction chamber 1 of the tunnel kiln is equipped with a flue gas concentration sensor 11 and a temperature sensor 12.

[0027] Furthermore, the equipment control host 5 is equipped with a metering distribution module 9 connected to the metering pump 8 and a spray control module 10 connected to the nozzles 2-3.

[0028] Furthermore, the metering pump 8 is electrically connected to the flue gas concentration sensor 11 and the temperature sensor 12 via the metering and distribution module 9; the nozzles 2-3 are electrically connected to the flue gas concentration sensor 11 and the temperature sensor 12 via the injection control module 10.

[0029] The above description is only a preferred embodiment of the present utility model. All other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present utility model.

Claims

1. A low-temperature denitrification structure for a tunnel kiln flue, comprising a tunnel kiln denitrification reaction chamber, wherein a trolley track is laid at the bottom of the tunnel kiln denitrification chamber, and a low-temperature denitrification device is installed in the tunnel kiln denitrification chamber, characterized in that: The low-temperature denitrification device includes a rotatable arc-shaped nozzle assembly, which includes multiple arc-shaped nozzles arranged in an array along the length of the tunnel kiln. The multiple arc-shaped nozzles are connected by denitrification liquid delivery pipelines, and nozzles are evenly distributed on the arc-shaped nozzles. Two arc-shaped nozzles located at both ends of the denitrification reaction chamber of the tunnel kiln are fixed with arc-shaped gear discs that cooperate with the arc-shaped nozzles on their outer sides. The lower ends of the two arc-shaped gear discs on the same side are respectively meshed with gear sets driven by servo motors. Rail clamps that cooperate with the surface of the arc-shaped gear discs are fixed on both sides of the gear sets. Stop blocks are fixed at the two free ends of the arc-shaped gear discs, and sensing elements that are electrically connected to the servo motors are installed on the stop blocks.

2. The tunnel kiln flue low-temperature denitration structure according to claim 1, characterized in that: It also includes a device control host, which is electrically connected to the sensing element.

3. The tunnel kiln flue low-temperature denitration structure according to claim 1, characterized in that: The denitrification liquid delivery pipeline is sequentially connected to a denitrification liquid storage tank and a denitrification liquid dilution tank. The denitrification liquid dilution tank is connected to a denitrification raw liquid pipe and a tap water dilution pipe. Metering pumps are installed on the denitrification raw liquid pipe and the tap water dilution pipe, and the metering pumps are electrically connected to the equipment control host.

4. The tunnel kiln flue low-temperature denitration structure according to claim 1, characterized in that: The denitrification reaction chamber of the tunnel kiln is equipped with a flue gas concentration sensor and a temperature sensor.

5. The tunnel kiln flue low-temperature denitration structure according to claim 3, characterized in that: The equipment control host is equipped with a metering and distribution module connected to the metering pump and a spray control module connected to the nozzle.

6. The tunnel kiln flue low-temperature denitration structure according to claim 2, characterized in that: The metering pump is electrically connected to the flue gas concentration sensor and the temperature sensor via a metering and distribution module; the nozzle is electrically connected to the flue gas concentration sensor and the temperature sensor via a spray control module.

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