Method for blowing out and purging double-section gas furnace

Abstract

The invention discloses a method for blowing out and purging a double-section gas furnace. Before purging after blowing out, the system is under positive pressure all the time, so that the risk in explosion caused by air entering into the system when the system is under negative pressure can be avoided; the system is under non-negative pressure state during the whole purging process, so that production safety during the purging process can be guaranteed; coal gas generated in the whole slagging process is indirectly fed into the system and used as energy; no exhaust gas is emitted into atmosphere in the whole process, so that the pollution to environment can be avoided; increasing of phenol amount after a large amount of steam entering into furnace can be avoided in the whole process. Themethod disclosed by the invention is capable of overcoming the defect of the traditional purging method that gas between pipelines and equipment among air cooler inlet valve, electric fishing coke inlet valve and gas furnace outlet pipe cannot be purged. The method is capable of avoiding the risk in explosion resulted from the phenomenon that the mixture of air and gas entering into furnace encounters with sparks or high temperature under the influence of failure in purging the gas between pipelines and equipment among air cooler inlet valve, electric fishing coke inlet valve and gas furnace outlet pipe.

Description

technical field [0001] The invention relates to the technical field of gas generators, in particular to an operation method of a double-stage gas furnace when the furnace is shut down and purged. Background technique [0002] The shutdown and purge method of the traditional double-stage gas furnace shutdown and purge method: [0003] Furnace shutdown method: [0004] 1. Open the release valve 23 on the top of the furnace, and ignite on the torch above the release pipe 22; [0005] 2. Open the external pressure steam valve 36, and pass steam into the furnace body 25; [0006] 3. Close the air flow valve 39 to cut off the air entering the gas furnace body 25; [0007] 4. Close the self-produced steam valve 40, open the bypass valve on the self-produced steam pipe 44, cut off the gas flowing back into the self-produced steam pipe, and unload the excess self-produced steam; [0008] 5. Close the inlet valve 15 of the air cooler and the inlet valve 27 of the electric coke cat...

AI Technical Summary

Problems solved by technology

[0016] Defects in energy saving, environmental protection and safety in the traditional shutdown and purging method:

[0018] 1. During the process of slag discharge after the shutdown of the furnace, a large amount of gas is continuously produced in the gas furnace due to the incoming steam and hot coal. The gas is burned by the torch on the release pipe 22, and a large amount of gas is wasted. energy;

[0019] 2. When the gas concentration on the gas stove is reduced to a certain level, the fire on the torch is extinguished. At this time, the mixed gas in the furnace that cannot reach the combustion concentration is discharged into the atmosphere and causes environmental pollution (up to more than ten hours);

[0021] 4. After the furnace is shut down, the inlet valve 27 of the electric tar catcher and the inlet valve 15 of the air cooler are closed, and the outlet water seal of the electric light oil catcher has been filled with water. A closed system is formed in the equipment between the outlet water seals of the light oil collector. After the temperature of the water gas in the system drops, the phenol water in the gas cools and precipitates, causing the volume of the gas in the system to shrink, forming a negative pressure. The high pressure system is likely to cause air to be sucked into the system and mix with gas, and an explosion accident will occur when high temperature or open flame is encountered in the system;

[0022] 5. If the inlet valve 27 of the electric tar collector and the inlet valve 15 of the air cooler are not closed tightly, the purification system equipment will draw the purification system into a negative pressure by the suction force (chimney effect) of the torch outlet gas with a height difference of about 20 meters. Increased the possibility of accidents in the air intake system

[0023] 2. Defects in the equipment purging stage after the furnace is shut down and the slag is discharged

[0024] 1. When the equipment is purged, the steam enters from the steam inlets 51 and 52, and is discharged into the atmosphere from the discharge pipe 6 of the electric tar collector, so that the steam at the inlet valve 27 of the electric tar collector and the air cooler The equipment between the inlet valve 15 and the outlet water seal of the electric light oil collector can purge and replace the gas in it, but the pipeline before the inlet valve 27 of the electric tar collector and the inlet valve 15 of the air cooler and the cyclone dust collector The equipment between the gas furnace and the gas in the pipeline cannot be replaced normally. This part of the gas is by removing the water in the water seal pool 46 and opening the cover plate on the wind box 12 of the air cooler. The position on 22 is high (possibility difference is about 20 meters), the natural convection of air passes through the gas furnace and then discharges into the atmosphere from the release pipe 22, because the air has entered in the furnace, at this time the gas enters the furnace and the furnace The air that has entered is mixed, and spontaneous combustion or explosion accidents are prone to occur when each channel in the furnace encounters sparks or high temperature. At the same time, the direct discharge of gas causes energy waste and air pollution;

[0025] 2. For the same reason, in the purging process of the previous step, since a large amount of gas is directly discharged into the atmosphere from the discharge pipe 6 of the electric light oil catcher, it causes waste of energy and pollution of the environment;

[0026] 3. Steam is used for purging in this process. During the purging process, changes in environmental conditions (such as sudden rain, insufficient steam for purging, etc.) may cause negative pressure in the system before the purging is completed, and the air is sucked into the system. accident occurred in

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