Points for Attention in the Use of Recirculating Chillers for Distillation Equipment

The recirculating chiller is a supporting
distillation equipment, which separates different mixtures by vaporizing and
condensing multiple times. It can be used well with the distillation equipment,
which can not only improve its operating efficiency, but also save energy.

In the normal operation of the
rectification equipment, the product quality index must meet the predetermined
requirements, that is, to ensure that the purity of at least one component in
the product meets the specified requirements, and the other components should
also be kept within the specified range. Therefore, it should be Take the
purity of the bottom of the device or the top of the device as the controlled
variable. However, online real-time monitoring of product purity has certain
difficulties. Therefore, in most cases, the “temperature and
pressure” in the rectification device are used to indirectly reflect the
product purity.

The direct quality index of the heating
constant temperature tank for the distillation equipment is the product
component, but the product component analysis cycle is long and the lag is
serious, so the temperature parameter has become a commonly used control index,
that is, controlled by the sensitive board.

The adjustment method of the recirculating
chiller for the distillation equipment is to appropriately adjust the reflux
ratio according to the temperature of the sensitive plate. For example, when
the temperature of the sensitive plate rises, it reflects that the XD of the
top product composition of the device has decreased. Therefore, at this time, a
signal is sent to appropriately increase the reflux ratio, so that when XD
rises to a qualified value, the temperature of the sensitive plate drops to the
specified value.

When the boiling points of the components
in the raw material liquid are similar, and the purity requirements of the
product are higher, it is not appropriate to use the general temperature
control method, but to use the temperature difference control method. The
temperature difference control is designed based on the principle that the
temperature change of the two plates is always relatively larger than the
temperature change range of a single plate. This method is easy to ensure the
purity of the product, and it is also conducive to the choice and use of the
instrument.

The recirculating chiller for the
distillation equipment is the core component of the chemical process equipment,
and the temperature control is the top priority for the rectification equipment
control. The drastic changes in temperature will cause the purity of the
separated components to decrease, which will affect the efficiency of the
rectification. The impact is large, and even causes the rectification unit to
fail to operate normally. The temperature control system creates good
conditions for the normal operation of the rectification unit. As the degree of
automation increases, the operation of the rectification device should also be
controlled by instrument automation, so that the quality of the product and the
stability of the operation of the rectification device are greatly improved.

Of course, the recirculating chiller can
also be used with other reaction equipment. In the pharmaceutical and chemical
industry, many temperature control fields need to be used to control the
temperature.