Solid-liquid separation device

Patent metadata

Field	Value
Publication number	US-10646794-B2
Application number	US-201515537691-A
Country	US
Kind code	B2
Filing date	Jan 23, 2015
Priority date	Jan 23, 2015
Publication date	May 12, 2020
Grant date	May 12, 2020

Abstract

A solid-liquid separation device performs dehydration or deoiling from a treated object using a substance A that is a gas at normal temperature and pressure and is capable of dissolving water and oil when liquefied. The separation device includes a substance B that circulates while generating phase change in a closed system, a compressor that compresses the substance B, a first heat exchanger that condenses substance B and evaporates of the substance A, an expansion valve that decompresses the condensed substance B, a second heat exchanger that evaporates substance B and condenses substance A, and a treatment tank wherein substance A is mixed with the treated object, substance A is evaporated while separated from the liquid in the first heat exchanger, and condensed in the second heat exchanger. The center of gravity of the first heat exchanger is lower than the second heat exchanger in a vertical direction.

First claim

The invention claimed is:

1. A solid-liquid separation device that performs a cleaning process of an activated carbon, the solid-liquid separation device comprising:
a first heat exchanger that is configured to:
store organic matter, water and a substance A that is capable of dissolving water and oil, wherein substance A is stored at a first liquid level that is above in a vertical direction a first flow path of a substance B into the first heat exchanger, and
evaporate a portion of the substance A stored in the first heat exchanger to form an evaporated substance A by exchanging a heat of condensation of a substance B and a heat of evaporation of the substance A;

a second heat exchanger that has a center of mass that is higher in the vertical direction than a center of mass of the first heat exchanger, wherein the second heat exchanger is configured to:
receive the evaporated substance A from the first heat exchanger,
condense the evaporated substance A to form a condensed substance A by exchanging a heat of evaporation of the substance B and a heat of condensation of the substance A, and
store the condensed substance A at a second liquid level that is below in the vertical direction a second flow path of the substance B into the second heat exchanger;

a treatment tank that is configured to:
receive a portion of the condensed substance A from the second heat exchanger,
mix the condensed substance A with the activated carbon to form a mixture of the organic matter, the water and the substance A, and
flow the organic matter, the water and the substance A to the first exchanger; and

a liquid level sensor that is configured to:
measure a level of the water in the first heat exchanger, and
determine a completion of the cleaning process of the activated carbon based on the level of the water measured in the first heat exchanger;

wherein the first heat exchanger and the second heat exchanger are positioned to overlap so that the first liquid level and the second liquid level tend to equalize in the vertical direction with respect to a common reference point when the cleaning process of the activated carbon is performed.

2. The solid-liquid separation device according to claim 1 , wherein
a flow path of the substance B is installed below the first liquid level.

3. The solid-liquid separation device according to claim 1 , wherein
a flow path of the substance B is installed above the second liquid level.

4. The solid-liquid separation device according to claim 1 , further comprising:
a gas-liquid separator that is installed in an upper portion of the first heat exchanger, wherein the gas-liquid separator extracts the evaporated substance A from a remainder of liquids stored in the first heat exchanger.

5. The solid-liquid separation device according to claim 1 , further comprising:
a gas-liquid separator that is installed in a lower portion of the second heat exchanger, wherein the gas-liquid separator extracts the evaporated substance A from a remainder of liquids stored in the second heat exchanger.

6. A solid-liquid separation method of performing a cleaning process of an activated carbon using the solid-liquid separation device of claim 1 , the solid-liquid separation method comprising:
providing the substance B in a closed system comprising the first flow path of the substance B and the second flow path of the substance B;
compressing the substance B;
exchanging the heat of condensation of the substance B and the heat of evaporation of the stored substance A within the first heat exchanger to obtain a condensed substance B;
decompressing the condensed substance B;
exchanging the heat of evaporation of the substance B and the heat of condensation of the substance A within the second heat exchanger to obtain the condensed substance A; and
mixing the condensed substance A with the activated carbon in the treatment tank, wherein the stored substance A is evaporated while being separated from the water and the organic matter in the first heat exchanger, and the evaporated substance A is condensed in the second heat exchanger; and
positioning the first heat exchanger and the second heat exchanger such that the center of mass of the first heat exchanger is lower than the center of mass of the second heat exchanger in a vertical direction,
wherein the first heat exchanger and the second heat exchanger are positioned to overlap such that the first liquid level and the second liquid level tend to equalize in the vertical direction with respect to a common reference point when the cleaning process of the activated carbon is performed.

7. The solid-liquid separation method according to claim 6 , wherein
the flow path of the substance B into the first heat exchanger is installed below the first liquid level of the substance A in the first heat exchanger.

8. The solid-liquid separation method according to claim 6 , wherein
the flow path of the substance B into the second heat exchanger is installed above the second liquid level of the substance A in the second heat exchanger.

9. The solid-liquid separation method according to claim 6 , wherein
a gas-liquid separator is installed in an upper portion of the first heat exchanger and downstream of a flow path of the evaporated substance A in the first heat exchanger.

10. The solid-liquid separation method according to claim 6 , wherein
a gas-liquid separator is installed in a lower portion of the second heat exchanger and downstream of a flow path of the substance A that is condensed within the second heat exchanger.

Assignees

• Hitachi Ltd

Inventors

• Sano Tadashi
• Matsuzawa Mitsuhiro
• Sekiya Sachio
• Kokugan Yoko

Classifications

• C02F2209/42

  Liquid level · CPC title

• B01J20/3475

  in the liquid phase · CPC title

• B01D11/0296

  Condensation of solvent vapours (condensation in general B01D5/00) · CPC title

• C02F1/283

  using coal, charred products, or inorganic mixtures containing them · CPC title

• F26B5/00

  Drying solid materials or objects by processes not involving the application of heat (separating liquids from solids by straining B01D; replacing liquids in wet solids by other liquids, e.g. water by spirit, B01D12/00; drying by electrophoresis B01J) · CPC title