PROCEDURE FOR REMOVING GASES FROM DISTILLING APPARATUS

Abstract: The present invention concerns a procedure for removing gases from a distilling apparatus (10). In the procedure, the effluent water is caused to flow from the distilling apparatus (10) along an effluent line (19) to an effluent heat exchanger (13) for recovering the heat contained in the effluent. The feed water is arranged to flow along a first branch line (14a) through a distillate heat exchanger (12) and along a second branch line (14b) through the effluent heat exchanger (13) to the purpose of preheating the feed water. The mixture of distillate, vapour and gases is conducted from the distilling apparatus (10) along a flow line (16) to a degassing heat exchanger (11), where the heat contained in the mixture is recovered. The recovered heat is utilized in preheating the feed water by conducting the feed water after the distillate heat exchanger (12) and the effluent heat exchanger (13) along a header line (15) through the degassing heat exchanger (11), and further by a tubular connector (20) into the distilling apparatus (10). The gases are allowed to escape from the degassing heat exchanger (11) through a gas venting hole (17) into the environment. The mixture flow is condensed in the degassing heat exchanger (11) to distillate, and the distillate is conducted from the lower part of the degassing heat exchanger (11) along a distillate line (18) to the distillate heat exchanger (12).

Description: Procedure for reinoving gases from distilling apparatus The present invention concerns a procedure for removing gases from a distilling apparatus in which procedure the effluent water is caused to run from the distilling apparatus along an effluent water line to an effluent heat exchanger for recovering the heat contained in the effluent and in which procedure the feed water is caused to flow along a first branch line through a distillate heat ex- changer and along a second branch line through an effluent water heat exchanger for preheating the feed water. In distilling apparatus such as e.g. in distilling apparatus operating on the thermocompressor principle, air is produced during operation, which has to be removed from the distilling apparatus Regarding distilling apparatus operating on the thermocompressor principle, reference is made, as state of art, for instance to the Finnish Patent No. 61999. In all distilling apparatus known in the art, air removal is arranged in that the distilling apparatus is provided with venting holes through which the air may escape into the environment Of course, a design like this is not advantageous with a view to energy economy. The object of the invention is to achieve improvement of distilling apparatus known in the art. The more specific object of the invention is to provide a distilling apparatus in which the gases generated during operation can be removed in a sensible way and uti íized The objects of the invention are attained by a procedure which is mainly characterized in that the mixture of distillate, vapour and gases is conducted from the distilling means along a flow line to a degassing heat exchanger, where the heat contained in said mixture is recovered and the recovered heat is utilized in preheating the feed water by conducting the feed water after said distillate heat exchanger and said effluent heat exchanger along a header line through said degassing heat exchanger, and further along a tubular connector to the distilling apparatus In the procedure Of the invention, it has been understood to eMploy a degassing heat exchanger to which is conducted fro the distilling apparatus the ixture of distillate, vapour and gas and the heat contained in the mixture is recovered the recovered heat is utilized in preheating the feed water. As result, the design of the invention renders possible that no separate feed water preheating is needed and1 moreover, the heat surfaces of the preceding heat exchangers can be reduced about 30% The invention is described in detail referring to the principle design of the invention presented in the figures of the drawing attached, to which however the invention is not meant to be exclusively confined. in the figure of the drawing, the distilling apparatus is generally indicated by reference numeral 10. As to its construction, the distilling apparatus 10 may be any type of distilling apparatus, and for instance it may be a distilling apparatus operating on the thermocompressor principle disclosed in the Finnish Patent No. 61999. By reference numeral 11 is indicated the degassing heat exchanger of the invention By reference numeral 12 is indicated a distillate heat exchanger known in itself in the art and by reference numeral 13, an effluent water heat exchanger known in itself in the art. By reference numeral 14 is indicated the feed line for the liquid to be distilled. The line 14 is divided into branches 14a and 14b, the branch 14a passing through the distillate heat exchanger 12 and the branch 14b similarly through the effluent heat exchanger 13. By reference numeral 15 is indicated the header line of the branches 14a and 14b in accordance with the basic idea of the invention, the mixture of distillate, vapour and gas is conducted from the distilling apparatus 10 by a tubular connector 16 to the degassing heat exchanger 11 of the invention This mixture flow is condensed to liquid in the degassing heat exchanger 11, and the gases can escape through a gas venting hole 17 into the environment. The recovered thermal energy has been disposed to heat the feed water flowing in the line 14,14a,14b and 15. After the degassing heat exchanger 11, the feed water is conducted along the line 20 into the distilling apparatus 10. Zn the lower part of the degassing heat exchanger 11, atubular connector 16 has been provided through which the distillate is withdrawn for use. From the <RTI ID=3.15> distilling apparatus 10. a tubular connector 19 leads to the effluent heat exchanger X and the effluent water flows along this line 19 and releases its heat in the effluent heat exchanger 13. The procedure of the invention renders possible the sensible remov al, and utilization, of the thermal energy contained in the gas and vapour generated in the distilling apparatus 10. As a result, when the design of the invention is applied, no separate feed water preheating is required in the distilling apparatus by the combined effect of the distillate heat exchanger 12 and the effluent heat exchanger 13 known in themselves in the art and of the degassing heat exchanger 11 of the invention the feed water can be adequately heated. As taught by the invention, the heat surfaces of the distillate heat exchanger 12 and similarly those of the effluent heat exchanger 13 can be reduced even as much as about 30%, which renders possible a structure of lighter weight and a distilling apparatus of lower cost. in the foregoing only the principle design of the invention has been described, and it is obvious to a person skilled in the art that numerous modifications can be made within the scope of the inventive idea presented in the claims following below.

Claims: Claims 1. A procedure for removing gases from adistilling apparatus tlQZ, in which procedure the effluent is caused to flow from the distilling apparatus along an effluent line (19) to an effluent heat exchanger (13) for recovery of the heat contained in the effluent water, and in which procedure the feed water is caused to flow along a first branch line tl4al through a distillate heat exchanger (12) and along a second branch line (14b) through the effluent heat exchanger (13) to the purpose of preheating the feed water, characterized in that the mixture of disttllate, vapour and gases is conducted from the distilling apparatus (10) along a flow line (16) to a degassing heat exchanger (llJ, where the heat contained in said mixture is recovered, and the recovered heat is utilized in preheating the feed water by conducting the feed water after said distillate heat exchanger (12) and said effluent heat exchanger t131 along a header line (15) through said degassing heat exchanger (11) and further by a tubular connector t20) into the distilling apparatus (10). 2. A procedure according to claim 1, characterized in that the gases are allowed to escape from said degassing heat exchanger (11) through a gas venting hole (17) into the environment. 3. A procedure according to claim 1 or 2, characterized in that said mixture flow Is condensed in the degassing heat exchanger (11) to distillate and the distillate is conducted from the lower part of the degassing heat exchanger t11) along a distillate line (18) to the distillate heat exchanger (12).

Inventors: HUHTA-KOIVISTO, ESKO
Applicants: OY-FINN-AQUA LTD.,
Application year: 1984
Main classification: B01D3
IPC codes: B01D3