Ammonia spraying grid device easy to overhaul

Abstract

The utility model provides an easily-overhauled ammonia spraying grating device which comprises a plurality of ammonia spraying branch pipes (1) arranged in parallel, all the ammonia spraying branch pipes (1) are horizontally arranged; each ammonia spraying branch pipe (1) is fixedly arranged on one rack (2); transmission teeth of the racks (2) face downwards, the front end of each rack (2) is meshed with a matched transmission gear (3), each transmission gear (3) is connected with an output shaft of a rotating motor (4), a gear and rack mechanism and an annular electromagnetic chuck structure are adopted, and when the coal-fired unit is shut down and overhauled, the transmission gears (3) can be driven to rotate by the transmission gears (3). And the ammonia spraying branch pipe 1 is moved out of the flue to be overhauled. The maintenance difficulty of the ammonia spraying grid can be effectively reduced, the construction amount in a flue is reduced, the construction safety risk is reduced, and the requirements of environment protection, energy conservation, convenience and safety of a denitration system of a coal-fired unit in the new era are met. The device is simple in structure, convenient to operate, good in application and popularization value and suitable for industrial large-scale use and popularization.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal-fired boiler denitration systems, and particularly relates to an easily repairable ammonia spraying grid device. Background Art

[0002] With the long-term use of denitrification equipment, the problem of ammonia injection grid blockage is common in power plants. The common reason is that the ash in the air enters the ammonia injection grid with the dilution fan. When the flue gas temperature is too low, the water condensed from the gas in the ammonia injection grid combines with the ash, causing the ammonia injection grid to gradually become blocked. The blockage of the ammonia injection grid will affect the uniform distribution of the sprayed ammonia, which will lead to a series of problems such as NOx emissions not meeting the standards, excessive ammonia emissions, and corrosion and blockage of equipment after SCR.

[0003] At present, when repairing the ammonia injection grid of the denitrification system of coal-fired units, there are the following two problems: because the ammonia injection grid is welded in the flue, on the one hand, it is difficult for technicians to check the blockage of the ammonia injection pipe, and on the other hand, it is not convenient for technicians to clear the blockage of the partially blocked ammonia injection pipe. Often, scaffolding must be set up in the flue, and high-risk processes such as cutting and welding construction must be carried out to clear and replace the blocked ammonia injection pipe. In general, the ammonia injection grid in the prior art generally has the problems of difficult maintenance, cumbersome maintenance process, and high risk, which leads to reduced efficiency of the entire denitrification equipment and even safety hazards. Utility Model Content

[0004] The utility model aims to provide an easily repairable ammonia spraying grid device to solve the problem in the prior art that the ammonia spraying grid is difficult and dangerous to repair, resulting in reduced efficiency of the entire denitrification equipment and potential safety hazards.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] An easily repairable ammonia injection grid device comprises a plurality of ammonia injection branch pipes arranged in parallel; all the ammonia injection branch pipes are arranged horizontally;

[0007] Each of the ammonia injection branch pipes is fixedly mounted on a rack; the transmission teeth of the rack face downward, the front end of each rack is meshed with a matching transmission gear, and each transmission gear is connected to an output shaft of a rotating motor;

[0008] The rotating motor can make the transmission gear rotate circumferentially, thereby driving the rack to move horizontally;

[0009] The rear end of the ammonia injection branch pipe can be sealed and connected to the external ammonia injection device; the upper wall of the ammonia injection branch pipe is evenly distributed along the axial direction with a plurality of ammonia nozzles arranged through it.

[0010] The utility model also has the following features:

[0011] Furthermore, the rear end of the ammonia injection branch pipe is sealed and connected to the external ammonia injection device through an ammonia connecting device.

[0012] The ammonia gas communication device is annular, and both ends of the ammonia gas communication device are detachably connected to the rear end of the ammonia injection branch pipe and the external ammonia injection device respectively.

[0013] Furthermore, the rear end of the ammonia injection branch pipe is connected with a magnetic sealing ring, and the front end of the ammonia gas communication device is provided with a mounting groove; the magnetic sealing ring can be sealed inside the mounting groove;

[0014] The rear end of the ammonia gas communication device is connected to the external ammonia spraying device through an annular electromagnetic suction cup.

[0015] Furthermore, the lower parts of all the racks are detachably provided with dust shields.

[0016] Compared with the prior art, the utility model has the following technical effects:

[0017] The utility model is an easy-to-maintain ammonia spray grid device, which adopts a gear rack mechanism and an annular electromagnetic suction cup structure, and can move the ammonia spray branch pipe to the outside of the flue for maintenance when the coal-fired unit is shut down for maintenance. The technicians can conduct a detailed inspection of the blockage of each ammonia spray branch pipe and ammonia nozzle without entering the flue, and repair them by clearing or replacing them according to the blockage situation. It can effectively reduce the difficulty of maintaining the ammonia spray grid, reduce the amount of construction in the flue, reduce the safety risk of construction, and meet the new era's requirements for environmental protection, energy saving, convenience, and safety of the denitration system of coal-fired units. It has a simple structure and convenient operation, has a good promotion and application value, and is suitable for large-scale use and promotion in industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall top view of the easily repairable ammonia spray grid device of the utility model;

[0019] Figure 2 This is a schematic diagram of the connection relationship between the ammonia injection branch pipe and the rack of the utility model;

[0020] Figure 3 It is a schematic diagram of the connection relationship between the ammonia injection branch pipe and the ammonia gas communication device of the utility model.

[0021] The meanings of the numbers in the figure are: 1. ammonia injection branch pipe; 2. rack; 3. transmission gear; 4. rotating motor; 5. ammonia nozzle; 6. ammonia connecting device; 7. magnetic sealing ring; 8. electromagnetic suction cup; 9. dust shield. DETAILED DESCRIPTION

[0022] It should be noted that, unless otherwise specified, all components in the present invention are components known in the prior art. For example, the "rotating motor" is a known and commonly used rotating motor.

[0023] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of the present application fall within the protection scope of the present invention.

[0024] like Figure 1 and Figure 2 As shown, an easily repairable ammonia injection grid device is characterized in that it includes a plurality of ammonia injection branch pipes 1 arranged in parallel; all ammonia injection branch pipes 1 are arranged horizontally.

[0025] Each ammonia injection branch pipe 1 is fixedly mounted on a rack 2; the transmission teeth of the rack 2 face downward, and the front end of each rack 2 is meshed with a matching transmission gear 3, and each transmission gear 3 is connected to the output shaft of a rotating motor 4.

[0026] The rotating motor 4 can cause the transmission gear 3 to rotate circumferentially, thereby driving the rack 2 to move horizontally.

[0027] The rear end of the ammonia injection branch pipe 1 can be sealed and connected to the external ammonia injection device; a plurality of ammonia nozzles 5 are evenly and continuously arranged on the upper wall of the ammonia injection branch pipe 11 along the axial direction.

[0028] The easy-to-repair ammonia injection grid device of the utility model adopts the form of matching the rack 2 and the transmission gear 3. When the coal-fired unit is shut down for maintenance, the ammonia injection branch pipe 1 can be directly moved outside the flue for maintenance. The technicians can conduct a detailed inspection of the blockage of each ammonia injection branch pipe 1 and the ammonia nozzle 5 without entering the flue, and repair them by clearing or replacing them according to the blockage.

[0029] This setting can effectively reduce the difficulty of maintenance of the ammonia injection grid, reduce the amount of construction in the flue, reduce the safety risk of construction, and meet the new era's demand for environmental protection, energy saving, convenience, and safety of the denitration system of coal-fired units. It has a simple structure and convenient operation, has a good promotion and application value, and is suitable for large-scale use and promotion in industry.

[0030] As a preferred solution, Figure 3 As shown, the rear end of the ammonia injection branch pipe 1 is sealed and connected to the external ammonia injection device through the ammonia connecting device 6.

[0031] The ammonia connecting device 6 is annular, and the two ends of the ammonia connecting device 6 are detachably connected to the rear end of the ammonia injection branch pipe 1 and the external ammonia injection device. The ammonia connecting device 6 makes the ammonia injection branch pipe 1 detachably connected to the external ammonia injection device, further reducing the difficulty of loading and unloading the device, which is convenient for maintenance personnel to operate.

[0032] Further preferably, a magnetic sealing ring 7 is connected to the rear end of the ammonia injection branch pipe 1, and a mounting groove is provided at the front end of the ammonia gas communication device 6; the magnetic sealing ring 7 can be sealed in the mounting groove.

[0033] The rear end of the ammonia gas communication device 6 is connected to the external ammonia spraying device through an annular electromagnetic suction cup 8 .

[0034] When this arrangement is in use, remote control can be achieved through electrical control.

[0035] Further preferably, a dust shield 9 is detachably provided at the lower part of all racks 2. When the device is working, it plays a role in blocking fly ash in the flue gas. When repairing, the dust shield 9 is first removed, and then the repair work can be carried out.

[0036] At present, this device has been put into use in a certain enterprise. Before using this device, a coal-fired unit had a problem: since the coal used by the coal-fired unit is high-sulfur coal, once part of the pipes in the ammonia injection grid are blocked, uneven ammonia injection will occur in the flue, and the escaped ammonia and the sulfide in the coal-fired flue gas will easily form ammonium bisulfate in the air preheater, causing serious blockage in the air preheater after SCR, affecting the overall equipment operation safety and energy efficiency. However, every time the unit is overhauled, because the ammonia injection grid of the denitrification system is welded inside the flue, there has always been a problem that it is difficult for technicians to find the blockage of the ammonia injection grid in the flue, and it is difficult to clear and replace the blocked ammonia injection pipe.

[0037] After the coal-fired unit is installed with the new easy-to-maintain ammonia injection grid device, when repairing the ammonia injection grid of the denitrification system, the technician first disconnects the power supply of the annular electromagnetic suction cup 8, and then starts the rotating motor 4 to drive the transmission gear 3 to rotate, drive the rack 2 to move horizontally, and move the ammonia injection branch pipe 1 fixed on the rack 2 to the outside of the flue. The technician then conducts a detailed inspection of the blockage of the ammonia injection branch pipe 1 and the ammonia nozzle 5. For equipment with less blockage, the on-site clearing method is used for cleaning; if the blockage is already serious, the overall replacement method is used for maintenance. After the maintenance is completed, the rotating motor 4 is started to drive the gear rack mechanism to dock the repaired ammonia injection branch pipe 1 with the installation groove of the ammonia connecting device 6. After reaching the specified position, the electromagnetic suction cup 8 is energized, and the magnetic sealing ring 7 will be tightly sucked onto the ammonia connecting device 6 to achieve sealing. This device effectively reduces the difficulty of maintenance of the ammonia injection grid of the denitrification system, realizes early detection and early clearing of blockage of the ammonia injection grid, avoids problems such as blockage of the air preheater after the SCR due to blockage of the ammonia injection grid, meets the environmental protection, energy saving, convenience and safety requirements of the coal-fired units, and is beneficial to the safe and stable operation of the denitrification system.

Claims

1. An easily repairable ammonia injection grid device, characterized in that: It comprises a plurality of ammonia injection branch pipes (1) arranged in parallel; all of the ammonia injection branch pipes (1) are arranged horizontally; Each of the ammonia injection branch pipes (1) is fixedly mounted on a rack (2); the transmission teeth of the rack (2) face downward, the front end of each of the racks (2) is meshed with a matching transmission gear (3), and each of the transmission gears (3) is connected to an output shaft of a rotating motor (4); The rotating motor (4) can cause the transmission gear (3) to rotate in a circumferential direction, thereby driving the rack (2) to move horizontally; The rear end of the ammonia injection branch pipe (1) can be sealed and connected to an external ammonia injection device; the upper wall of the ammonia injection branch pipe (1) is evenly distributed along the axial direction with a plurality of ammonia nozzles (5) arranged through it.

2. The easily repairable ammonia injection grid device according to claim 1, characterized in that: The rear end of the ammonia injection branch pipe (1) is sealed and connected to the external ammonia injection device through the ammonia communication device (6); The ammonia gas communication device (6) is annular in shape, and both ends of the ammonia gas communication device (6) are detachably connected to the rear end of the ammonia injection branch pipe (1) and the external ammonia injection device, respectively.

3. The easily repairable ammonia injection grid device according to claim 2, characterized in that: The rear end of the ammonia injection branch pipe (1) is connected to a magnetic sealing ring (7), and the front end of the ammonia gas communication device (6) is provided with a mounting groove; the magnetic sealing ring (7) can be sealed inside the mounting groove; The rear end of the ammonia gas communication device (6) is connected to an external ammonia spraying device via an annular electromagnetic suction cup (8).

4. The easily repairable ammonia injection grid device according to claim 2, characterized in that: The lower part of all the racks (2) is detachably provided with a dust shield (9).

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