steam recovery control

I'm not sure of your control goals here. Are you going to keep the wash water at some constant temperature, or is this a case that you can put whatever steam you make in to the chip wash system? Is there any reason you need to keep it at some pressure? What constitutes good control? Good control of what (and why)?

I can think of several control systems which could be used in this situation, but without a bit on the goals, I don't think it is a good idea to pick one yet.

Michael

The last plant I worked with had a continuous digester, running on pressure control. Any control of waste steam is going to be a slave to the main controller.

If it is desired to just recover the heat, then just route the vent to the water tank feeding the chip washer. Unless the temperature variation in the wash water would be a problem.

If temperature variati>Dears.

Michael:

I am worry if a install new line of 3 barg recovered steam consumption, I could affect flow of steam to chip heating tank. Because flow of recovered steam is variable.

Then, I need to privilege steam to chip heating tank and all rest or part of rest of steam should go to chip washing system.

In chip washing system, I have temperature tank control. Today, I am using fresh steam which could be replace by recovered steam.

Regards,

Anibal

Since you have the temperature control for the water in place, just pipe the waste steam from the digerster to the tank, uncontrolled. Right into the water since you can't recover this steam anyway. Maybe add a nozzle to add some velocity at the point of entry.

Put a check flow valve or at least a vacuum breaker on that steam if you are going to do this. There is nothing quite so embarrassing as explaining how you go chips back in to the steam system. In the event of a shutdown, many steam lines suddenly become fantastic vacuums.

I will install a pressure valve control which will be control after principal pressure control, check flow valve and inline inyector steam. Thanks for your comments,

Anibal

I will put a pressure valve control, check flow valve and inline inyector steam. Thanks for your comments,