Coke oven gas pressurizing blower with self-cleaning device

Abstract

The utility model discloses a coke oven gas pressurizing blower with a self-cleaning device, which comprises a blower pedestal, a rotor set and a blower shell, the blower shell is integrally arranged above the blower pedestal, two sides of the blower shell are respectively provided with a blower inlet and a blower outlet, the rotor set comprises a main shaft and an impeller, and the impeller is arranged on the main shaft. The main shaft is horizontally installed in the air blower shell in a penetrating mode, the two ends of the air blower shell are rotationally connected with the main shaft through shell end covers, one end of the main shaft is connected with a speed regulation type cleaning driving motor outside the air blower shell, and the multiple sets of impellers are all installed on the main shaft in the air blower shell. The air blower shell is provided with a plurality of sets of spraying and cleaning adjusting valves right above the impeller, and the air blower shell is provided with a plurality of sets of drainage valves right below the impeller. The device has the advantages that the safety performance of pressurized conveying of coke oven gas is improved, the rotor set and the air blower shell are self-cleaned without disassembly, the maintenance cost is reduced, the utilization efficiency and the sealing leakproof performance of equipment are improved, and the device has monitoring and alarming functions.

Description

Technical Field

[0001] The utility model relates to the technical field of blowers, and particularly relates to a coke oven gas pressurizing blower with a self-cleaning device. Background Art

[0002] Coke oven gas is a combustible gas generated during the coking process. It is a toxic and explosive dangerous gas. Coke oven gas contains corrosive impurities such as ammonia and hydrogen cyanide, as well as easily condensable and crystallizable impurities such as benzene, naphthalene, tar, and dust. The coke oven gas pressurizing blower is the core equipment of the coke oven gas transportation and purification system in the coking plant.

[0003] Since coke oven gas is a corrosive and explosive dangerous gas, the impeller material of the blower is selected as duplex stainless steel, the sealing material is selected as wear-resistant copper alloy, and the sealant is selected as corrosion-resistant sealant to meet the special requirements of coke oven gas for materials.

[0004] Coke oven gas contains easily condensable and crystallizable impurities such as benzene, naphthalene, tar, and dust, which are easily adhered to the impeller and the internal flow channel of the shell. During long-term operation, serious ash adhesion and scaling on the impeller cause the impeller to lose balance, the vibration amplitude of the rotor group increases, and the ash adhesion and scaling in the internal flow channel of the shell affect gas flow, reducing the operation efficiency. It often requires shutdown for manual descaling. Content of the Utility Model

[0005] The purpose of the utility model is to provide a coke oven gas pressurizing blower with a self-cleaning device, which can improve the safety performance of the whole machine for coke oven gas pressurizing and transportation, realize the self-cleaning function of the main shaft, impeller and blower shell without disassembly, reduce the maintenance cost, improve the equipment utilization efficiency, have good sealing and anti-leakage performance, and have vibration and pressure monitoring and alarm devices.

[0006] The above technical purpose of the utility model is achieved through the following technical solutions:

[0007] A coke oven gas pressurizing blower with a self-cleaning device is characterized in that it includes a blower pedestal, a rotor group and a blower shell. The blower shell is integrally installed above the blower pedestal. Blower inlets and blower outlets are respectively arranged on both sides of the blower shell. The rotor group includes a main shaft and an impeller. The main shaft horizontally penetrates and is installed inside the blower shell. Both ends of the blower shell are rotationally connected to the main shaft through shell end covers. One end of the main shaft is connected with a speed-regulating type cleaning drive motor outside the blower shell. Multiple groups of impellers are provided and are all installed on the main shaft inside the blower shell. Multiple groups of spray cleaning regulating valves are arranged on the blower shell directly above the impellers. Multiple groups of drain valves are arranged on the blower shell directly below the impellers.

[0008] Preferably, a guide shaft sleeve is arranged on the main shaft between adjacent impellers.

[0009] Preferably, a flow guiding baffle is arranged inside the blower housing between adjacent impellers. The flow guiding baffle and the flow guiding shaft sleeve form an arc-shaped turning channel. An abrasion-resistant copper alloy explosion-proof sealing piece is arranged on the inner side of the flow guiding baffle. The abrasion-resistant copper alloy explosion-proof sealing piece, the impeller, the flow guiding baffle and the flow guiding shaft sleeve form a labyrinth seal.

[0010] Preferably, a flow guiding ring is arranged at the inlet of each group of impellers. The flow guiding ring is arc-shaped. The outer side of the flow guiding ring is hermetically installed with the blower housing. The inner side of the flow guiding ring fits the inlet of the impeller. An abrasion-resistant copper alloy explosion-proof labyrinth seal is arranged between the inlet of the impeller and the blower housing.

[0011] Preferably, two groups of bearing seats are installed on both sides of the blower housing of the fan pedestal through fastening bolts. Both ends of the main shaft are supported and installed in the two groups of bearing seats. Multiple groups of vibration monitoring sensors are installed on the bearing seats.

[0012] Preferably, a clutch is installed on the bearing seat on the inlet side of the blower. One end of the clutch is connected to a speed-regulating cleaning drive motor, and the other end is fitted and installed with the fan main shaft. A speed detection sensor is installed below the main shaft on the bearing seat on the outlet side of the blower.

[0013] Preferably, a group of spray cleaning regulating valves are correspondingly arranged above each group of impellers. The multiple groups of spray cleaning regulating valves are all communicated with a spray cleaning connecting pipe.

[0014] Preferably, a corrosion-resistant sealant is filled at the sealing surface between the housing end cover and the blower housing. After the housing end cover and the blower housing are assembled, they are closely fitted. A number of floating graphite seal rings are arranged at the contact between the housing end cover and the main shaft. An isolation nitrogen storage chamber is arranged among the number of floating graphite seal rings. The isolation nitrogen storage chamber is communicated with a nitrogen connecting pipe. A ball valve is arranged on the nitrogen connecting pipe. A pressure reducing valve is arranged at the inlet of the nitrogen connecting pipe. The nitrogen connecting pipe after the pressure reducing valve is also communicated with the blower housing through a pipeline. A differential pressure sensor is installed on the pipeline between the nitrogen connecting pipe and the blower housing.

[0015] Preferably, safety limit shaft sleeves are also assembled at both ends of the main shaft. A safety limit boss is arranged on the safety limit shaft sleeve close to the impeller side. An explosion-proof labyrinth seal body is also arranged between the safety limit shaft sleeve and the housing end cover. The installation clearances of the safety limit shaft sleeve in the radial and axial directions with the explosion-proof labyrinth seal body are smaller than the safety distance between the rotor group and the blower housing. There is a stepped step on the safety limit shaft sleeve close to the floating carbon ring side. The stepped step and the explosion-proof labyrinth seal body are arranged in an alternating manner with long and short comb teeth.

[0016] In summary, the beneficial effects of the present utility model are as follows:

[0017] The blower of the present utility model adopts an efficient pneumatic design, with good pneumatic performance and high operating efficiency. The main shaft and the blower housing are sealed with a carbon ring and nitrogen, ensuring no leakage risk of toxic, flammable and explosive gases. The sealing surface of the housing uses corrosion-resistant sealant, solving the corrosion problem of conventional sealant by coke oven gas, meeting the requirements of long-term safe and reliable operation. The main shaft is horizontally arranged inside the blower housing, and safety limit bushings are sleeved at both ends of the main shaft. An explosion-proof labyrinth seal is arranged between the inner side of the housing end cover and the safety limit bushing. A differential pressure sensor is equipped with external sealing nitrogen for the housing. When the data is abnormal, it will alarm automatically. Multiple groups of spray cleaning devices are arranged on the upper part of the blower housing, and multiple groups of drain valves are arranged on the lower part of the blower housing. A speed-regulating cleaning drive motor is installed on the main shaft at the blower inlet side, so as to realize the cleaning of the rotor group and the blower housing.

[0018] The present utility model improves the safety performance of the whole machine for pressurized transportation of coke oven gas, realizes the function of self-cleaning without disassembling the main shaft, impeller and blower housing, reduces the maintenance cost, improves the equipment utilization efficiency, has good sealing and leakage prevention performance, and has vibration and pressure monitoring and alarm devices. Brief Description of the Drawings

[0019] Figure 1 is the overall structural schematic diagram of the present utility model;

[0020] Figure 2 is Figure 1 the structural schematic diagram at A in

[0021] Figure 3 is Figure 1 the structural schematic diagram at B in

[0022] Figure 4 is Figure 1 the structural schematic diagram at C in

[0023] In the figure: 1. Blower pedestal, 2. Rotor group, 3. Blower housing, 4. Main shaft, 5. Impeller, 6. Deflector baffle, 7. Deflector bushing, 8. Deflector ring, 9. Speed-regulating cleaning drive motor, 10. Clutch, 11. Vibration monitoring sensor, 12. Bearing housing, 13. Rotation speed detection sensor, 14. Pressure reducing valve, 15. Ball valve, 16. Nitrogen connection pipe, 17. Differential pressure sensor, 18. Spray cleaning regulating valve, 19. Spray cleaning connection pipe, 20. Drain valve, 21. Wear-resistant copper alloy explosion-proof labyrinth seal, 22. Sealing piece, 23. Floating graphite seal ring, 24. Sealing isolation nitrogen storage chamber, 25. Safety limit bushing, 26. Explosion-proof labyrinth seal body, 27. Housing end cover, 28. Corrosion-resistant sealant, 29. Blower inlet, 30. Blower outlet. Detailed Embodiment

[0024] The following further describes the specific implementation manners of the present utility model in conjunction with the accompanying drawings. This embodiment does not constitute a limitation to the present utility model.

[0025] As Figures 1 to 4 shown, a coke oven gas pressurizing blower with a self-cleaning device includes a blower pedestal 1, a rotor group 2 and a blower housing 3. The blower pedestal 1 has strong rigidity and is not easily deformed. The blower housing 3 is integrally installed above the blower pedestal 1. Coke oven gas contains corrosive, flammable, explosive and other dangerous gases. The blower housing 3 assembly is made of 316L stainless steel and adopts a multi-pass annealing process to solve the problem of large deformation during the production of the stainless steel casing and meet the requirements of final assembly precision control. The blower housing 3 is subjected to an airtightness test to meet the zero-leakage requirement. The blower inlet 29 and the blower outlet 30 are respectively arranged on both sides of the blower housing 3. The rotor group 2 includes a main shaft 4 and an impeller 5. The main shaft 4 is made of alloy steel to improve the rigidity of the main shaft 4 and ensure the safe operation of the main shaft 4 under surge conditions and meet the requirements for use in the explosion-proof area of the blower. Finite element analysis and rotor dynamics analysis technologies are used to analyze the deformation of the impeller 5 and the rigidity of the main shaft 4 to ensure that there is still sufficient safety distance margin between the rotor group 2 and the blower housing 3 under surge conditions to avoid rubbing and ensure the safe and stable operation of the blower in the explosion-proof area. The duplex stainless steel welding process is adopted to improve the corrosion resistance of the impeller 5 and ensure the working reliability of the impeller 5 in a corrosive environment. The main shaft 4 is horizontally installed through the blower housing 3, and both ends of the blower housing 3 are rotationally connected to the main shaft 4 through housing end caps 27. One end of the main shaft 4 is connected to a speed-regulating cleaning drive motor 9 outside the blower housing 3. Multiple groups of impellers 5 are arranged and are all installed on the main shaft 4 inside the blower housing 3. Multiple groups of spray cleaning regulating valves 18 are arranged above the impellers 5 on the blower housing 3, and multiple groups of drain valves 20 are arranged below the impellers 5 on the blower housing 3. When spraying cleaning liquid, the drain valves 20 are closed, and the cleaning liquid is stored inside the entire blower housing 3. The rotor group 2 rotates continuously in the cleaning liquid for repeated cleaning. After the cleaning is completed, the drain valves 20 are opened, and spray water is started to wash the rotor group 2 and the entire inside of the blower housing 3. After the washing is completed, the drain valves 20 are closed.

[0026] Flow guide bushings 7 are arranged on the main shaft 4 between adjacent impellers 5. Flow guide baffles 6 are arranged inside the blower housing 3 between adjacent impellers 5. The flow guide baffles 6 and the flow guide bushings 7 form an arc-shaped turning channel. The flow guide bushings 7 accurately position the impellers 5 on the main shaft 4 and cooperate with the flow guide baffles 6 to guide the air flow smoothly into the next-stage impeller 5. Wear-resistant copper alloy explosion-proof sealing sheets 22 are arranged on the inner side of the flow guide baffles 6 to effectively reduce gas leakage. The wear-resistant copper alloy explosion-proof sealing sheets 22 and the impellers 5, the flow guide baffles 6, and the flow guide bushings 7 form a labyrinth seal.

[0027] At the inlet of each group of impellers 5, a flow guiding ring 8 is provided. The flow guiding ring 8 is arc-shaped. The outer side of the flow guiding ring 8 is sealed and installed with the blower housing 3. The inner side of the flow guiding ring 8 fits the inlet of the impeller 5, greatly reducing the erosion and wear of the gas impurities on the seal of the impeller 5, reducing the accumulation of coal tar impurities at the seal of the impeller 5, extending the service life of the seal, reducing the air flow impact loss at the inlet of the impeller 5, improving the operation efficiency of the blower. A wear-resistant copper alloy explosion-proof labyrinth seal 21 is provided between the inlet of the impeller 5 and the blower housing 3 to reduce the gas leakage loss.

[0028] On both sides of the blower housing 3, two groups of bearing seats 12 are installed on the blower pedestal 1 through fastening bolts. Both ends of the main shaft 4 are supported and installed in the two groups of bearing seats 12 to support the high-speed rotation of the blower rotor and bear the running load of the rotor. Multiple groups of vibration monitoring sensors 11 are installed on the bearing seats 12 to monitor the bearing vibration value during the operation of the blower. The vibration alarm value and shutdown value are set respectively. After exceeding the allowable limit value, the alarm and shutdown signals can be output. After the rotor group 2 is cleaned, the bearing vibration value is monitored to evaluate the cleaning effect, and the cleaning method of the rotor group 2 is adjusted according to the change of the vibration value.

[0029] A clutch 10 is installed on the bearing seat 12 on the side of the blower inlet 29. One end of the clutch 10 is connected to the speed-regulating cleaning drive motor 9, and the other end is fitted and installed with the blower main shaft 4. When the blower needs to be cleaned, the clutch 10 is combined with the main shaft 4, and the motor speed is adjusted according to the demand to drive the rotation of the blower rotor group 2 to complete the cleaning. After the cleaning is completed, the clutch 10 is separated from the main shaft 4. A speed detection sensor 13 is installed below the main shaft 4 on the bearing seat 12 on the side of the blower outlet 30. When the rotor group 2 is cleaned, the cleaning speed of the rotor group 2 is monitored.

[0030] Above each group of impellers 5, a group of spray cleaning regulating valves 18 are correspondingly provided to control the flow rates of the cleaning liquid and the spray water. The spray cleaning regulating valves 18 are opened according to the cleaning requirements and closed after the cleaning is completed. A plurality of spray cleaning regulating valves 18 are all connected to a spray cleaning connecting pipe 19. The spray cleaning connecting pipe 19 receives the external cleaning liquid and spray water and transports them into the blower housing 3 through the spray cleaning regulating valves 18.

[0031] At the sealing surface between the housing end cover 27 and the blower housing 3, a corrosion-resistant sealant 28 is filled, effectively solving the problem of the corrosion of conventional sealants by coke oven gas and meeting the requirements of long-term safe and reliable operation. After the housing end cover 27 and the blower housing 3 are assembled, they fit tightly, and the corrosion-resistant sealant 28 fills the tiny gaps on the joint surface to ensure zero leakage at the joint surface. At the contact between the housing end cover 27 and the main shaft 4, several groups of floating graphite seal rings 23 are provided. There is an isolation nitrogen storage chamber 24 among several groups of floating graphite seal rings 23. The isolation nitrogen storage chamber 24 is connected to a nitrogen pipe 16. The nitrogen pipe 16 receives external nitrogen and transports it to the isolation nitrogen storage chamber 24 at the housing end cover 27. A ball valve 15 is provided on the nitrogen pipe 16 to control the nitrogen supply. The ball valve 15 is opened during the operation of the fan and closed after the fan stops. A pressure reducing valve 14 is provided at the inlet of the nitrogen pipe 16. The pressure reducing valve 14 reduces the external high-pressure nitrogen pressure value to the pressure value required for the safe operation of the fan according to the gas pressure value during different operating conditions of the fan. The nitrogen pipe 16 after the pressure reducing valve 14 is also connected to the blower housing 3 through a pipe. A differential pressure sensor 17 is installed on the pipe between the nitrogen pipe 16 and the blower housing 3. When the differential pressure value between the nitrogen and the coke oven gas in the blower housing 3 is less than the set safety value, it can automatically alarm to ensure the safe operation of the fan. During the operation of the fan, the ball valve 15 is opened, and the nitrogen reaches the set pressure value after being reduced by the pressure reducing valve 14 and enters the isolation nitrogen storage chamber 24. The nitrogen pressure value in the isolation nitrogen storage chamber 24 is higher than the coke oven gas pressure value in the blower housing 3 to ensure that the gas does not leak outside the blower housing 3.

[0032] Safety limit bushings 25 are also assembled at both ends of the main shaft 4. The safety limit bushings 25 are made of stainless steel material to isolate the corrosion of the main shaft 4 by coke oven gas. A safety limit boss is provided on the side of the safety limit bushing 25 close to the impeller 5. An explosion-proof labyrinth seal body 26 is also provided between the safety limit bushing 25 and the housing end cover 27 to effectively isolate the high-temperature flue gas in the blower housing 3 from the floating graphite seal rings 23 on the outside of the blower housing 3, greatly reducing the gas pressure at the floating graphite seal rings 23 and extending the service life of the floating graphite seal rings 23. The explosion-proof labyrinth seal body 26 is made of copper alloy and has good lubricity and wear resistance. No sparks are generated when it rubs against the safety limit bushing 25 under unexpected circumstances, which can effectively protect the rotor group 2 and the blower housing 3. The radial and axial installation clearances between the safety limit bushing 25 and the explosion-proof labyrinth seal body 26 are smaller than the safety distance between the rotor group 2 and the blower housing 3. Under unexpected circumstances, the safety limit bushing 25 and the explosion-proof labyrinth seal body 26 will rub against each other first and can withstand all collision impact forces to ensure that the rotor group 2 does not rub against the housing. There is a stepped step on the side of the safety limit bushing 25 close to the floating graphite seal ring 23. The stepped step and the explosion-proof labyrinth seal body 26 are arranged with alternating long and short comb teeth to effectively isolate the coke oven gas inside the blower housing 3 and extend the service life of the floating graphite seal rings 23.

[0033] The blower of the present utility model adopts an efficient pneumatic design, with good pneumatic performance and high operating efficiency. The main shaft and the blower housing are sealed with a carbon ring and nitrogen, ensuring no leakage hazards of toxic, flammable and explosive gases. The sealing surface of the housing uses corrosion-resistant sealant, solving the corrosion problem of conventional sealant by coke oven gas, meeting the requirements of long-term safe and reliable operation. The main shaft is horizontally arranged inside the blower housing, and safety limit bushings are sleeved at both ends of the main shaft. An explosion-proof labyrinth seal body is arranged between the inner side of the housing end cover and the safety limit bushing. Nitrogen for external sealing of the housing and a differential pressure sensor are provided, and an automatic alarm is triggered when the data is abnormal. Multiple groups of spray cleaning devices are arranged on the upper part of the blower housing, and multiple groups of drain valves are arranged on the lower part of the blower housing. A speed-adjustable cleaning drive motor is installed on the inlet side of the main shaft of the blower, thus realizing the cleaning of the rotor group and the blower housing.

[0034] The present utility model improves the safety performance of the whole machine for pressurized transportation of coke oven gas, realizes the function of self-cleaning of the main shaft, impeller and blower housing without disassembly, reduces the maintenance cost, improves the equipment utilization efficiency, has good sealing and leak prevention performance, and has vibration and pressure monitoring and alarm devices.

[0035] The above are only the preferred embodiments of the present utility model, and are not used to limit the present utility model. Those skilled in the art can make various modifications or equivalent replacements to the present utility model within the essence and protection scope of the present utility model, and such modifications or equivalent replacements should also be regarded as falling within the protection scope of the technical solution of the present utility model.

Claims

1. A coke oven gas pressure blower with a self-cleaning device, characterized in that: The utility model comprises a fan base, a rotor group and a blower casing, wherein the blower casing is installed as a whole above the fan base, and a blower inlet and a blower outlet are respectively arranged on both sides of the blower casing, the rotor group comprises a main shaft and an impeller, the main shaft is horizontally penetrated and installed in the blower casing, and the two ends of the blower casing are rotatably connected with the main shaft through the casing end cover, one end of the main shaft is connected with a speed-regulating cleaning drive motor outside the blower casing, the impeller is provided with multiple groups, all of which are installed on the main shaft inside the blower casing, the blower casing is provided with multiple groups of spray cleaning regulating valves directly above the impeller, and the blower casing is provided with multiple groups of drain valves directly below the impeller.

2. The coke oven gas pressure blower with a self-cleaning device according to claim 1, characterized in that: A guide sleeve is arranged on the main shaft between adjacent impellers.

3. The coke oven gas pressure blower with a self-cleaning device according to claim 2, characterized in that: A guide baffle is arranged between adjacent impellers inside the blower housing, and the guide baffle and the guide sleeve form an arc-shaped turning channel. A wear-resistant copper alloy explosion-proof sealing sheet is arranged on the inner side of the guide baffle, and the wear-resistant copper alloy explosion-proof sealing sheet forms a labyrinth seal with the impeller, the guide baffle and the guide sleeve.

4. The coke oven gas pressure blower with a self-cleaning device according to claim 1, characterized in that: A guide ring is provided at the inlet of each group of impellers. The guide ring is arc-shaped. The outer side of the guide ring is sealed with the blower housing, and the inner side of the guide ring fits the inlet of the impeller. A wear-resistant copper alloy explosion-proof labyrinth seal is provided between the inlet of the impeller and the blower housing.

5. The coke oven gas pressure blower with a self-cleaning device according to claim 1, characterized in that: The fan base is provided with two sets of bearing seats on both sides of the blower housing by fastening bolts, and the supports at both ends of the main shaft are installed in the two sets of bearing seats, and multiple sets of vibration monitoring sensors are installed on the bearing seats.

6. The coke oven gas pressure blower with a self-cleaning device according to claim 5, characterized in that: A clutch is installed on the bearing seat on the inlet side of the blower. One end of the clutch is connected to the speed-regulating cleaning drive motor, and the other end is installed in cooperation with the blower main shaft. A speed detection sensor is installed below the main shaft of the bearing seat on the outlet side of the blower.

7. The coke oven gas pressure blower with a self-cleaning device according to claim 1, characterized in that: A group of spray cleaning regulating valves is correspondingly arranged above each group of impellers, and multiple groups of spray cleaning regulating valves are all connected to a spray cleaning connecting pipe.

8. The coke oven gas pressure blower with a self-cleaning device according to claim 1, characterized in that: The sealing surface between the shell end cover and the blower shell is filled with corrosion-resistant sealant. The shell end cover and the blower shell are tightly fitted after assembly. A plurality of groups of floating graphite sealing rings are arranged at the contact point between the shell end cover and the main shaft. An isolated nitrogen storage chamber is arranged in the middle of the plurality of groups of floating graphite sealing rings. The isolated nitrogen storage chamber is connected to a nitrogen connecting pipe, a ball valve is arranged on the nitrogen connecting pipe, a pressure reducing valve is arranged at the inlet of the nitrogen connecting pipe, the nitrogen connecting pipe after the pressure reducing valve is also connected to the blower shell through a pipeline, and a differential pressure sensor is installed on the pipeline between the nitrogen connecting pipe and the blower shell.

9. The coke oven gas pressure blower with a self-cleaning device according to claim 1, characterized in that: Both ends of the main shaft are also equipped with safety limit sleeves, and the safety limit sleeve is provided with a safety limit boss near the impeller side. An explosion-proof labyrinth seal is also provided between the safety limit sleeve and the shell end cover. The radial and axial installation clearances of the safety limit sleeve and the explosion-proof labyrinth seal are smaller than the safety distance between the rotor group and the blower shell. The safety limit sleeve has a stepped step near the floating carbon ring side, and the stepped step and the explosion-proof labyrinth seal are arranged alternately by long and short comb teeth.

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