DD290587A5 - DISTILLATION APPARATUS WITH REDUCED COOLING WATER TREATMENT - Google Patents

Abstract

The distillation apparatus with reduced Kuehlwasserdurchlauf, especially water distillation apparatus for large-scale and laboratory-based production of ultrapure water has a simple multi-point control system as a circuit arrangement for reducing the amount of cooling water to the minimum required for the distillation process. Here, in front of the radiator, connected in series, a pressure reducing valve and a solenoid valve and after the radiator two temperature or a temperature sensor and a time delay Ver¬ electrically coupled so that when it reaches an adjustable upper Küehlwassertemperatur the solenoid valve is opened and thereby cooling water through the Cooler continues to flow until the temperature of the cooling water at the second temperature sensor has dropped below the set value or when the solenoid valve is opened when an adjustable cooling water temperature is reached and the adjustable time delay circuit is triggered after the temperature at the cooling water drain has fallen below, thus delaying the closing of the solenoid valve. dasz a further drop in the cooling water temperature is reached below the temperature set at the temperature sensor for the purpose of stable operation of the device. Fig. 1 {distillation; ultrapure water; Cooler; Kuehlschlange; Multipoint control; Pressure reducing valve; Magnetic valve; Temperaturfuehler; Zeitverzoegerungsschaltung}

Description

For this 2 pages drawings

Field of application of the invention

The invention relates to a distillation apparatus with reduced cooling water flow, in particular to a water distillation apparatus for large-scale and laboratory separation of mixtures.

Characteristic of the known state of the art The principle of water-cooled distillation apparatus based on the fact that a mixture in a Destillatisnskolben

evaporated and condensed in a distillation flask downstream cooler this steam on a cooling coil

The condensation is used in known apparatus by a constant and continuous cooling water Cooling water drain causes the cooler. To reduce the cooling water consumption, a device according to DD-WP150984 is known, in which for a certain Amount of distillate is no longer consumed cooling water, as is absolutely necessary for the physical-technical process. The device is constructed so that in front of the radiator above the cooling coil, a constant K ^ Mwasserniveau and thus in

the cooling coil a constant pressure generating regulator and after the radiator a flowing through the cooling water in

Depending on the temperature of the flowing cooling water regulating throttle valve is arranged or that after the Cooling coil in the cooling water drain a temperature sensor, which gives its sign to a the heating power of the distillation flask

located heater control controller outputs, is arranged. Furthermore, in the cooling water drain one through their

Bore diameter, the temperature of the cooling water controlling throttle arranged. The device has the following disadvantages:

1. For smooth operation of the device two controllers are necessary. FIn controller regulates the level of cooling water in front of the cooling coil, a second controller controls either the cooling water flow rate depending on the temperature of the cooling water or a second regulator regulates the heating power of the heater in or on the distillation flask depending on the cooling water outlet temperature. With this regulator arrangement, the expenditure on equipment of the distillation apparatus is considerable, whereby the susceptibility to failure and the costs increase.

2. In the event that depending on the cooling water temperature dio heating power is controlled in or on the distillation flask, fluctuations in the amount of distillate depending on the temperature which has the cooling water at the entrance of the cooler.

Object of the invention

The aim of the invention is to provide a distillation apparatus with reduced cooling water flow, in which a simplification of apparatus and an increase in the reliability of the apparatus is achieved by a control mechanism.

Explanation of the essence of the invention

The object of the invention is to provide a distillation apparatus with reduced cooling water flow, in particular a water distillation apparatus, which reduces the cooling water consumption to a minimum required for the distillation process and at the same time sets the cooling water temperature to the required distillation task. According to the invention the object is achieved in that is dispensed with the known arranged in the cooling water circuit cooling water level controller and the use of a simple multipoint control system, a reduction in the amount of cooling water is effected to the minimum required for the distillation process. Here, in front of the radiator, connected in series, a pressure reducing valve and a solenoid valve and the radiator two temperature sensors are arranged, one of the temperature sensor when reaching an adjustable upper cooling water temperature opens the solenoid valve and thereby cooling water flows through the radiator until the temperature of Cooling water at the second temperature sensor has fallen below the set value.

The device can also be set up with an adjustable temperature sensor in conjunction with an adjustable time delay circuit in which the solenoid valve is opened when the set temperature is reached and after the temperature has fallen below the time delay circuit delays closing of the solenoid valve, causing the temperature of the cooling water to drop further below that at the temperature sensor set temperature is reached. By the operation of the device according to the invention is achieved that the heat storage capacity of the water is fully utilized in the cooling coil, resulting in a significant reduction in cooling water consumption. A needle valve which precedes the radiator together with the solenoid valve has the task of reducing the generally too high fresh water pressure to a pressure that is harmless for the radiator.

embodiment

The invention will be explained below with reference to two embodiments. The accompanying drawings show

Fig. 1: A schematic representation of the invention Destillationsapparatur with two temperature sensors on

radiator outlet

 Fig. 2: A schematic representation of the distillation apparatus according to the invention with a temperature sensor and a

Time delay circuit. The distillation apparatus according to FIG. 1 and FIG. 2 consists of a distillation flask 1 with a heater 2 and one with a Cooling coil 4 equipped cooler 3. In the cooling water supply line 5, a pressure reducing valve β and a solenoid valve. 7

switched on.

In the embodiment of Fig. 1 are located at the end of the cooling coil 4 in an extension of the cooling coil 4 the Temperature sensor 8 and 9. The temperature sensor 8.9 are connected to a known circuit 10 in conjunction, which the solenoid valve

7 controls. The temperature sensor 8 is set to an upper temperature and the temperature sensor 9 to a lower temperature. When the cooling water reaches the upper temperature, the solenoid valve 7 is opened and flows for a long time

Cooling water from the cooling water line 5 through the cooling coil 4 until the cooling water at the temperature sensor 9, the lower Temperature has reached, whereupon the solenoid valve 7 is closed. The cooling water in the cooling coil 4 heats up

again and will be replaced again when the upper temperature set on the temperature sensor 8 is reached. To this

It is achieved that only as much cooling water is consumed, as is necessary for the distillation process. In the embodiment of Fig. 2, at the end of the cooling coil 4, there is only one temperature sensor 8, which is at the upper permissible Temperature of the cooling water is set. When reaching the upper temperature, as already described, the Solenoid valve 7 is opened. Sinks through the injected cold cooling water, the temperature at the temperature sensor 8 below the

set value, the known time delay circuit 11 is triggered, which after the set

Time the solenoid valve 7 closes. The time delay has a stabilizing effect on the function of the device. Due to the fact that the temperature of the Cooling water drops by the time delay a few degrees below the switching temperature, the switching frequency is reduced and

similar working cycles achieved as in the apparatus of FIG. 1st

Claims (2)

1. distillation apparatus with reduced cooling water flow, consisting of a distillation flask with downstream cooler with cooling coil, characterized in that via a multi-point control as circuit arrangement (10) in front of the radiator (3) in the cooling water inlet (5) in series a pressure reducing valve (6) and a Solenoid valve (7) with two, after the radiator (3) arranged in the cooling water discharge temperature sensors (8,9) are electrically coupled. 2. distillation apparatus with reduced cooling water flow, according to claim 1, characterized in that a multi-point control circuit as a circuit (10) in front of the radiator (3) in the cooling water inlet in series a pressure reducing valve (6) and a solenoid valve (7) with a, after Cooler (3) arranged in the cooling water discharge temperature sensor (8) and an adjustable time delay circuit (11) are electrically coupled.