Method for replacing safety valve of boiler drum of coke drying quenching boiler

Abstract

The invention discloses a method for replacing a safety valve of a boiler drum of a coke drying quenching boiler. According to the method, nitrogen gas is introduced into gas pipelines of a coke drying quenching furnace and a boiler, cold water cooling is performed in a water jacketing operation mode, meanwhile, the temperature of the coke drying quenching boiler is reduced quickly in a mode of making cold air enter from a manhole of the boiler and exhausting the cold air from an opening of the coke quenching furnace by utilizing gas buoyancy, and finally, the safety valve of the boiler drum of the boiler is replaced quickly; compared with the prior art, the method has the following beneficial effects that: (1) the time that the boiler drum of the boiler satisfies safety valve replacing conditions is shortened, and the conditions required for replacing the safety valve of the boiler drum of the boiler are satisfied within eight hours; and (2) the accident handling time can be shortened and the production loss can be reduced by the method.

Description

technical field

[0001] The invention relates to the technical field of coking, in particular to a method for rapidly replacing a dry quenching boiler drum safety valve. Background technique

[0002] After the CDQ boiler drum pressure exceeds the specified allowable range, the boiler drum safety valve takes off to release the pressure to ensure the safe and stable operation of the boiler drum.

[0003] However, due to reasons such as the boiler drum safety valve not falling back, the safety valve body was damaged. Since the safety valve of the boiler drum is connected by welding, argon arc welding is used when replacing the safety valve. There must be no water vapor in the welding site during argon arc welding, which has high requirements for the working environment. Therefore, the boiler drum is required to lower the temperature and pressure to achieve Replace the safety valve condition.

[0004] The traditional replacement method needs to stop the CDQ furnace, and replace...

Examples

Embodiment Construction

[0021] Below in conjunction with specific embodiment the embodiment of the present invention is further described:

[0022] Such as figure 1 As shown, the coke CDQ-boiler system is composed of a coke CDQ oven 3, a boiler 17, a gas pipeline for connecting the two, and a water pipeline of the boiler 17. The high-temperature flue gas generated by the CDQ oven 3 enters the boiler 17 for heat exchange after being dedusted once, and the flue gas after heat exchange by the boiler 17 is subjected to secondary dedusting, then added nitrogen to cool down, and returns to the CDQ oven 3 as the bottom of the furnace CDQ cooling.

[0023] The boiler 17 is connected to the deaerator 13 through the boiler water pump 15 and the water supply pipeline. The circulating water in the boiler 17 needs to be deoxidized by the deaerator 13 and then re-enters the boiler 17 for circulation. Before entering the deaerator 13, the water needs to be heated by steam The pipe is heated to a certain temperatu...

technical field

[0001] The invention relates to the technical field of coking, in particular to a method for rapidly replacing a dry quenching boiler drum safety valve. Background technique

[0002] After the CDQ boiler drum pressure exceeds the specified allowable range, the boiler drum safety valve takes off to release the pressure to ensure the safe and stable operation of the boiler drum.

[0003] However, due to reasons such as the boiler drum safety valve not falling back, the safety valve body was damaged. Since the safety valve of the boiler drum is connected by welding, argon arc welding is used when replacing the safety valve. There must be no water vapor in the welding site during argon arc welding, which has high requirements for the working environment. Therefore, the boiler drum is required to lower the temperature and pressure to achieve Replace the safety valve condition.

[0004] The traditional replacement method needs to stop the CDQ furnace, and replace...

Examples

Embodiment Construction

[0021] Below in conjunction with specific embodiment the embodiment of the present invention is further described:

[0022] Such as figure 1 As shown, the coke CDQ-boiler system is composed of a coke CDQ oven 3, a boiler 17, a gas pipeline for connecting the two, and a water pipeline of the boiler 17. The high-temperature flue gas generated by the CDQ oven 3 enters the boiler 17 for heat exchange after being dedusted once, and the flue gas after heat exchange by the boiler 17 is subjected to secondary dedusting, then added nitrogen to cool down, and returns to the CDQ oven 3 as the bottom of the furnace CDQ cooling.

[0023] The boiler 17 is connected to the deaerator 13 through the boiler water pump 15 and the water supply pipeline. The circulating water in the boiler 17 needs to be deoxidized by the deaerator 13 and then re-enters the boiler 17 for circulation. Before entering the deaerator 13, the water needs to be heated by steam The pipe is heated to a certain temperatu...

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