High-pressure ammonia is used instead of low-pressure ammonia to cool the gas collection pipe

It’s impossible to do. The pipes for high-pressure ammonia are small, resulting in a low flow rate; meanwhile, the flow rate of the circulating ammonia is high. When high-pressure ammonia is used for spraying, the amount distributed to each bridge tube is extremely small, making it impossible to reduce the temperature of the gas collection tubes.

This method is highly unsuitable; I agree with the view expressed in the second comment. If only a few are installed, it can also lead to negative pressure in the gas collection ducts, thereby harming the furnace

In the gas collection pipe, high-pressure ammonia water is not sprayed in the upper part of the pipe; instead, there is a bent tube at the bottom of the pipe serving as an air intake, which is used to remove tar. How can it be sprayed there? Naturally, it cannot achieve a cooling effect. If it must be used at all, it’s somewhat useful at the bridge pipes. However, the volume of high-pressure ammonia water is much smaller than that of low-pressure ammonia water; it simply isn’t enough to ensure that ammonia water is sprayed from every bridge pipe. In reality, using fire-fighting water for cooling is a better option. But this puts extra workload on your rise-pipe operators—they’ll have plenty to clean up.

In the design of coke oven processes, there is an emergency response system for accident situations; for example, in the event of a power outage or damage to the low-pressure ammonia water pump, production fire-fighting water can be introduced into the low-pressure ammonia water pipelines of the coke oven. After closing the main valve for low-pressure ammonia water, this water is pumped into the bridge pipes via those pipelines, thereby serving to reduce the temperature. High-pressure ammonia water is available on the coke oven; it is generally used to clean the tar at the bottom of the gas collection pipes as well as for smokeless coal charging. However, the high-pressure ammonia water pipelines are narrow and have a low flow rate, so using them to cool the gas collection pipes is ineffective. There is also a low-pressure ammonia water spray on the collecting main, primarily for dust suppression. When switching to emergency water, this valve can be closed. Furthermore, when switching water under emergency conditions, it is essential to open the valve slowly to prevent sudden temperature changes from causing deformation of the pipes.

This method is highly inadvisable. If only a few vents are opened, it can even cause negative pressure in the collection pipe, which may damage the furnace

I don’t believe in high pressure without low pressure, but venting can lower the temperature of the collection ducts! ! ! ! ! ! ! ! ! ! !

Reducing the pressure of the high-pressure ammonia water can serve as a temporary emergency measure

I didn’t see any instances in the factory where high voltage was used in place of low voltage. I remember that the master technician switched between high and low voltage.

It’s impossible to do. The specific reasons were clearly explained by the comrades earlier.

The high-pressure ammonia water is activated only during coal charging; this creates a strong suction force that draws the dust and smoke generated during coal charging into the collection duct. This ensures environmental friendliness, as there is no cooling effect. Once coal charging is completed, the system switches to operating with low-pressure ammonia water.