A coke oven bridge pipe spray height adjustable anti-blocking ammonia water spraying system

Abstract

This utility model discloses an anti-clogging ammonia water spraying system with adjustable spray height for coke oven bridge pipes. The aim is to provide an anti-clogging ammonia water spraying system with an adjustable spray height to adapt to different operating conditions, and to integrate this system into the coke oven centralized control system to achieve automated nitrogen cleaning and purging. The adjustable ammonia water nozzle pipe is fixed to the bottom of the ammonia water chamber, and its vertical height is adjustable by 55mm; the lower end of the adjustable ammonia water nozzle pipe cooperates with ammonia water nozzle I, making its vertical height adjustable by 35mm. The nitrogen branch pipe is connected to the ammonia water branch pipe at a 30° angle to the main axis. The nitrogen electric ball valve can be opened in three ways to flush out tar residue and other substances accumulated in ammonia water nozzles I and II. This system can reduce the workload of workers, ensure sufficient contact and cooling of the raw coal gas with the ammonia water, and avoid the risk of direct ammonia water spraying into the carbonization chamber and damaging the furnace walls, thus providing a stable operating environment for long-term production.

Description

Technical Field

[0001] This utility model relates to an anti-clogging ammonia spraying system with adjustable spray height for coke oven bridge pipes, belonging to the technical field of coking oven production equipment and raw coal gas extraction system. Technical Background

[0002] In the coke oven production process, the main function of the raw coal gas system is to cool the raw coal gas exiting the oven (including charging flue gas), guide it to the gas purification unit, maintain and control the positive pressure in the carbonization chamber throughout the coking process, and prevent excessive pressure in the carbonization chamber from leaking coal gas into the environment, causing smoke and fire, and polluting the environment. The main process is as follows: Raw coal gas at a temperature of approximately 750℃ is drawn out through the riser pipe, and sprayed with hot circulating ammonia water at a temperature of 75~80℃ as it passes through the bridge pipe. Due to the rapid evaporation of the ammonia water and the large amount of heat absorbed, the temperature of the raw coal gas is reduced to 80~100℃, and some condensed tar is precipitated. The gas is then sent to the gas purification area through the gas collecting pipe and the suction pipe.

[0003] Traditional ammonia spraying systems use fixed nozzles installed at the top of the bridge pipe, employing normally open valves to continuously spray circulating hot ammonia water for cooling and removing slag gas. This type of ammonia spraying system has the following drawbacks:

[0004] 1. Tar residue, naphthalene, coal dust, and other substances carried in the raw coke oven gas will cool and condense, clogging the ammonia water nozzles and reducing the ammonia water atomization effect. This leads to large fluctuations in temperature and pressure in the gas collecting pipe and suction pipe system, affecting the output of raw coke oven gas from other ovens. In severe cases, it can cause gas overflow and smoke / fire. Furthermore, a single coke oven typically contains over one hundred ammonia water nozzles; frequent blockages will affect the normal production of the coke oven, and replacing and cleaning the nozzles will significantly increase the labor intensity for workers.

[0005] 2. The main ammonia water pipe is typically installed in a single or two-section configuration, with branch pipes arranged along the length of the coke oven to connect to various perforated bridge pipes or gas collecting pipes. The pressure and flow rate of the branch pipes near the main pipe differ from those far from the main pipe, resulting in variations in the atomization spray angle of the ammonia water nozzles. If ammonia water nozzles with uniform installation height and flow characteristics are used, the branch pipe with higher pressure will spray ammonia water into the carbonization chamber, reducing coke quality and damaging the carbonization surface and furnace walls. Traditional fixed ammonia water nozzles cannot be adjusted vertically, and replacement and maintenance are inconvenient. Utility Model Content

[0006] The purpose of this invention is to provide an ammonia spraying system that is clog-resistant and allows for adjustable spray height to suit different operating conditions. This system can be integrated into the centralized control system of a coke oven to achieve automated nitrogen cleaning and purging. This not only increases the service life of ammonia nozzles I and II and reduces the workload of maintenance workers, but also solves the problems existing in the technical background, ensuring the long-term stable operation of the coke oven.

[0007] This utility model is achieved through the following technical solution:

[0008] A nitrogen branch pipe is connected to each ammonia branch pipe at a 30° angle to the main axis. An ammonia gland is installed at the ammonia branch pipe connection to the bridge pipe to collect the ammonia. The adjustable ammonia nozzle pipe is fixed to the bottom of the ammonia gland via an internal thread. An internal hexagonal hole is provided at its upper end for easy adjustment of the height of the adjustable ammonia nozzle pipe using a universal wrench, with a maximum vertical adjustment of 55mm. The adjustable ammonia nozzle pipe is equipped with an ammonia gland sleeve and a locking nut at the top to prevent loosening after height adjustment. The lower end of the adjustable ammonia nozzle pipe has an internal long thread to mate with ammonia nozzle I, allowing for a maximum vertical adjustment of 35mm. A separate nitrogen electric ball valve is installed on the nitrogen branch pipe and communicates with the coke oven single carbonization chamber pressure regulation system. During oven drying operation, when the system receives a "fully closed" signal from the central control isolation valve, the nitrogen electric ball valve can be opened manually on-site, remotely manually, or automatically to flush out accumulated tar residue, naphthalene, coal dust, and other substances from ammonia nozzles I and II. To prevent the ammonia nozzles I and II from clogging after long-term operation of the coke oven, thus reducing the ammonia atomization effect and causing pressure and temperature fluctuations in coke oven production, while also reducing the workload of maintenance workers.

[0009] The advantages of this utility model compared with the prior art are:

[0010] 1. This technology effectively removes tar residue, naphthalene, coal dust, and other substances accumulated in ammonia nozzles I and II, preventing these substances from clogging the channels, reducing ammonia atomization efficiency, and causing large fluctuations in temperature and pressure in the gas collecting and suction pipe systems, thus affecting the extraction of raw gas from other furnaces. Furthermore, this technology effectively reduces the frequency of replacing ammonia nozzles I and II, lowering the workload for maintenance personnel.

[0011] 2. The ammonia water nozzle I has a total vertical adjustable distance of 90mm (of which the adjustable ammonia water nozzle pipe is adjustable by a maximum of 55mm, and the ammonia water nozzle I is adjustable by a maximum of 35mm), meeting all adjustment needs caused by installation and manufacturing errors and changes in the pressure of the main pipe at the beginning and end; the spraying height and flow rate of the ammonia water nozzle I of each bridge pipe can be adjusted individually, with a large operating space; it adapts to the production needs (pressure, flow rate) of different circulating ammonia water conditions in the chemical production area; the adjustment is convenient, and the height can be adjusted without removing the ammonia water nozzle I, reducing the workload of workers; after adjustment, the ammonia water can fully contact the raw coal gas and cool it down, while avoiding the risk of ammonia water being directly sprayed into the carbonization chamber and damaging the furnace wall, providing a stable operating environment for long-term production. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the system layout of this utility model.

[0013] Figure 1In the middle section: 1. Ammonia water branch pipe, 2. Ammonia water branch pipe valve, 3. Ammonia water metal hose, 4. Ball valve at ammonia water nozzle I, 5. Ball valve at ammonia water nozzle II, 6. Ammonia water gland, 7. Nitrogen branch pipe, 8. Inspection valve, 9. Nitrogen electric ball valve, 10. Check valve, 21. Bridge pipe.

[0014] Figure 2 , Figure 3 , Figure 4 This is a detailed assembly drawing of the present invention.

[0015] Figure 2 In the middle: 11. Ammonia water gland plug, 12. Liftable ammonia water nozzle pipe, 13. Locking nut, 14. Plug sealing washer, 15. Spare ammonia water gland plug, 16. Ammonia water nozzle I.

[0016] Figure 3 In the middle: ammonia water nozzle pipe 17, ammonia water nozzle pipe sealing flange 18, ammonia water nozzle II 19.

[0017] Figure 4 Detailed drawing of the liftable ammonia nozzle pipe 12.

[0018] Figure 5 Detailed drawing of tool 20 for tightening nuts. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and examples:

[0020] See attached document Figure 1 Circulating ammonia water from the chemical production area is led out along the length of the coke oven via a segmented ammonia water main pipe to ammonia water branch pipe 1 of bridge pipe 21. Ammonia water branch pipe valve 2 and ammonia water metal hose 3 are installed on this branch pipe. The ammonia water metal hose 3 is used to absorb expansion and errors caused by temperature changes during installation and production, and uses flange connections for easy disassembly and maintenance. Two pipes are installed, each connected to bridge pipe 21: ammonia water nozzle I 16 is used to reduce the temperature of raw coal gas, and a ball valve 4 is installed at ammonia water nozzle I to roughly adjust the ammonia water flow rate; ammonia water nozzle II 19 is used to cool the inner wall of bridge pipe 21 to prevent the accumulation of tar, naphthalene, and other substances during long-term operation, protecting the equipment and extending its service life. A ball valve 5 is installed at ammonia water nozzle II to roughly adjust the ammonia water flow rate. Nitrogen branch pipe 7 also extends along the length of the coke oven, entering at a 30° angle to the main axis of ammonia water branch pipe 1 to ensure flushing effect; nitrogen branch pipe 7 is equipped with a nitrogen electric ball valve 9, a maintenance valve 8, and a check valve 10.

[0021] During use, the nitrogen electric ball valve 9 remains closed throughout the coking process. When the coke oven central control receives the "isolation valve fully closed" signal to begin oven curing, the nitrogen electric ball valve 9 automatically opens, and nitrogen is used to purge ammonia nozzles I16 and II19. When the coke oven central control receives the "isolation valve open" signal to end oven curing, the nitrogen electric ball valve 9 automatically closes, ending the purging process. When maintenance of the nitrogen electric ball valve 9 is required, the maintenance valve 8 and check valve 10 are closed to prevent ammonia from flowing back into the nitrogen main pipe.

[0022] See attached document Figure 2 An ammonia water gland 6 is set up to buffer slight fluctuations in the main pressure. The liftable ammonia water nozzle pipe 12 is fixed to the bottom of the ammonia water gland using an ammonia water gland sleeve 11, and the top is fixed with a locking nut 13 to prevent the position of the liftable ammonia water nozzle pipe 12 from changing after long-term operation.

[0023] See attached document Figure 3 A dedicated cooling ammonia water nozzle II19 is installed on the inner wall of the bridge pipe 21, which eliminates the need to adjust the spray angle and flow rate, and therefore no lifting structure is required.

[0024] See attached document Figure 4 The adjustable ammonia nozzle tube 12 has a hexagonal hole at its upper end for easy height adjustment using a general-purpose tool, with a vertical adjustment range of 55mm. The lower end, where the nozzle is mounted, has a deep thread, allowing for a 35mm adjustment range, and a through groove is cut on its outer side to secure the adjustable ammonia nozzle tube 12 when adjusting the height of the ammonia nozzle I 16. The locking nut 13 also has through grooves on both sides for easy loosening during adjustment. Therefore, the ammonia nozzle I 16 has a total adjustable range of 90mm, meeting all adjustment requirements.

[0025] When using, after calculating the distance to be adjusted based on the height of the ammonia spray, use the special tool 20 for locking nuts to loosen the locking nut 13, and use a general-purpose Allen wrench to adjust the height of the adjustable ammonia nozzle pipe 12, or use a general-purpose wrench to adjust the height of the ammonia nozzle I 16. After adjustment, tighten the locking nut 13 and close the ammonia port flange cover.

Claims

1. A clog-resistant ammonia spraying system with adjustable spray height for coke oven bridge pipes, characterized in that: A nitrogen branch pipe is connected to the wall of each ammonia branch pipe at a 30° angle to the main axis; an ammonia gland is installed at the end of the ammonia branch pipe where it connects to the bridge pipe to receive ammonia. The bottom of the ammonia gland is fixed with an internal thread to a liftable ammonia nozzle pipe. In addition, an ammonia gland sleeve and a locking nut are installed above the liftable ammonia nozzle pipe to make it vertically adjustable and lockable after adjustment to prevent loosening; the lower end of the liftable ammonia nozzle pipe has an internal long thread to cooperate with ammonia nozzle I, making it vertically adjustable.

2. The anti-clogging ammonia spraying system with adjustable spray height for coke oven bridge pipes according to claim 1, characterized in that: A nitrogen flushing unit is installed on the wall of each ammonia branch pipe, which is achieved through a nitrogen flushing branch pipe at a 30° angle to the main axis.

3. The anti-clogging ammonia spraying system with adjustable spray height for coke oven bridge pipes according to claim 1, characterized in that: On the nitrogen branch pipe used for purging, an electric ball valve and maintenance valve for nitrogen gas, controlled by the coke oven centralized control system, are installed, which can realize local, remote and automatic operation.

4. The anti-clogging ammonia spraying system with adjustable spray height for coke oven bridge pipes according to claim 1, characterized in that: The ammonia water nozzle tube structure is adjustable, mainly including an adjustable ammonia water nozzle tube, an ammonia water gland plug, a locking nut, an ammonia water gland and a special tool for locking the nut, so that the vertical height of the ammonia water nozzle I can be adjusted by 90mm.

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