Clear liquid evaporation concentration system

Abstract

The present invention provides a clear liquid evaporation and concentration system for concentrating the clear liquid, characterized in that: it comprises a plurality of concentration stations, the plurality of concentration stations are connected in sequence, the clear liquid is gradually concentrated by passing through the plurality of concentration stations in sequence, the concentration stations are provided with a shell-side loop and a tube-side loop, the clear liquid enters the tube-side loop, the shell-side loop is connected with steam or condensed water for providing heat required for concentrating the clear liquid, a plurality of concentration stations are provided, the plurality of concentration stations are connected in sequence, the clear liquid is gradually concentrated by passing through the concentration stations in sequence, and at the same time, through the cooperation of a circulating pump, a heater and a separator, the steam generated in the tube-side loop process is recycled and utilized, and applied to the shell-side loop to provide heat required for concentration for the next station, thereby greatly reducing the energy consumption for concentrating the clear liquid.

Description

Technical Field

[0001] The invention relates to the field of fuel ethanol production, and in particular to a clear liquid evaporation and concentration system. Background Art

[0002] As energy conservation and emission reduction become the mainstream environmental slogan in the world today, ethanol gasoline is gradually used to replace traditional gasoline. Energy structure adjustment and reduction of environmental pollution have promoted the development of ethanol fuel. At present, the domestic grain ethanol production process will produce a large amount of alcohol grains with a dry matter content of 3.9%. Generally, manufacturers use the co-production DDS process for treatment, which consumes a lot of energy. Summary of the invention

[0003] The technical problem to be solved by the present invention is that the energy consumption of treating alcohol grains clear liquid by using the co-production DDS process is high. The present invention provides a clear liquid evaporation and concentration system to solve the above problem.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a clear liquid evaporation and concentration system, which is used for concentrating the clear liquid, and is characterized in that it includes a plurality of concentration stations, which are connected in sequence, and the clear liquid is gradually concentrated by passing through the plurality of concentration stations in sequence, and the concentration stations have a shell-side loop and a tube-side loop, the clear liquid enters the tube-side loop, and the shell-side loop is connected with steam or condensed water for providing heat required for concentrating the clear liquid.

[0005] Furthermore: the concentration station includes a circulation pump, a heater and a separator. In the tube-side loop, the circulation pump pumps the clear liquid at the bottom of the heater to the top of the heater, and a gas-liquid mixture outlet is provided on the heater; in the shell-side loop, a steam inlet and a condensed water outlet are provided on the heater; a gas-liquid mixture inlet, a gas phase outlet and a liquid phase outlet are provided in the separator, the gas-liquid mixture outlet is connected to the gas-liquid mixture inlet, and the liquid phase outlet is connected to the inlet of the circulation pump.

[0006] Further: the concentration stations are sequentially the first effect station, including the first circulation pump, the first heater and the first separator; the second effect station, including the second circulation pump, the second heater and the second separator; the third effect station, including the third circulation pump, the third heater and the third separator; the fourth effect station, including the fourth circulation pump, the fourth heater and the fourth separator; the fifth effect station, including the fifth circulation pump, the fifth heater and the fifth separator; the sixth effect station, including the sixth circulation pump, the sixth heater, the sixth separator and the sixth discharge pump; the seventh effect station, including the seventh circulation pump, the seventh heater and the seventh separator; the clear liquid evaporation concentration system also includes the eighth effect station, including the eighth circulation pump, the eighth heater and the eighth separator; in the pipe loop, the first separator is provided with a material inlet The first circulation pump pumps the clear liquid treated by the first effect station into the second circulation pump; the second circulation pump pumps the clear liquid treated by the second effect station into the third circulation pump; the third circulation pump pumps the clear liquid treated by the third effect station into the fourth circulation pump; the fourth circulation pump pumps the clear liquid treated by the fourth effect station into the fifth circulation pump; the fifth circulation pump pumps the clear liquid treated by the fifth effect station into the sixth circulation pump; the sixth discharge pump pumps the clear liquid treated by the sixth effect station into the seventh circulation pump; the seventh discharge pump pumps the clear liquid treated by the sixth effect station into the eighth separator, the eighth circulation pump pumps the clear liquid at the bottom of the eighth separator to the eighth heater, the eighth heater is connected to the eighth separator, and the bottom of the kettle of the eighth heater is provided with a material outlet.

[0007] Further: in the shell-side loop, the steam is connected to the steam inlet of the first heater, the gas phase outlet of the first separator is connected to the steam inlet of the second heater, the gas phase outlet of the second separator is connected to the steam inlet of the third heater and the steam inlet of the fourth heater, the gas phase outlet of the third separator and the gas phase outlet of the fourth separator are both connected to the steam inlet of the sixth heater; the first heater is provided with a first steam outlet, the first steam outlet is connected to the steam inlet of the fifth heater, the fifth heater is provided with an exhaust port, and the gas phase outlet of the fifth separator and the gas phase outlet of the sixth separator are both connected to an exhaust device.

[0008] Furthermore: a secondary flash evaporation device is arranged between the sixth effect station and the seventh effect station, the water inlet of the secondary flash evaporation device is connected to a condensed water inlet pipe, and the steam outlet of the secondary flash evaporation device is connected to the steam inlet of the seventh heater and the steam inlet of the eighth heater.

[0009] Furthermore: a heat exchanger is arranged between the sixth effect station and the seventh effect station, and the shell side of the heat exchanger is respectively connected to the water outlet and the condensate drain pipe of the secondary flash evaporation device; the tube side of the heat exchanger is respectively connected to the outlet of the sixth discharge pump and the inlet of the seventh circulation pump.

[0010] Further: the sixth effect station also includes a sixth flash tank. In the shell-side loop, the second heater, the third heater, the fourth heater, the fifth heater, the seventh heater and the eighth heater are all provided with condensate inlets, and the condensate outlet of the second heater is connected to the condensate inlet of the third heater; the condensate outlet of the third heater, the condensate outlet of the fourth heater and the condensate outlet of the sixth heater are connected to the inlet of the sixth flash tank, and the steam outlet of the sixth flash tank is connected to the shell side of the sixth heater; the condensate outlet of the seventh heater is connected to the condensate inlet of the eighth heater, and the condensate outlet of the eighth heater is connected to the condensate inlet of the second heater; the condensate outlet of the first heater and the condensate outlet of the fifth heater are connected to a washing water tank.

[0011] The beneficial effect of the present invention is that the clear liquid evaporation and concentration system of the present invention is provided with a plurality of concentration stations, and the plurality of concentration stations are connected in sequence, and the clear liquid is gradually concentrated through the concentration stations in sequence, and at the same time, through the cooperation of the circulating pump, the heater and the separator, the steam generated in the concentration tube loop process is recycled and utilized, and applied to the shell loop to provide the heat required for concentration for the next station, thereby greatly reducing the energy consumption of clear liquid concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0013] Figure 1 It is a structural schematic diagram of a concentration station of a clear liquid evaporation concentration system of the present invention;

[0014] Figure 2 It is a system diagram of the first effect station, the second effect station, the seventh effect station and the eighth effect station;

[0015] Figure 3 It is a system diagram of the third effect station, the fourth effect station, the fifth effect station and the sixth effect station.

[0016] In the figure, 1, a circulation pump, 2, a heater, 3, a separator, 4, a gas-liquid mixture outlet, 5, a steam inlet, 6, a condensate outlet, 7, a gas-liquid mixture inlet, 8, a gas phase outlet, 9, a liquid phase outlet, 11, a first circulation pump, 12, a first heater, 13, a first separator, 21, a second circulation pump, 22, a second heater, 23, a second separator, 31, a third circulation pump, 32, a third heater, 33, a third separator, 41, a fourth circulation pump, 42, a fourth heater, 43, a fourth separator, 51 , fifth circulation pump, 52, fifth heater, 53, fifth separator, 61, sixth circulation pump, 62, sixth heater, 63, sixth separator, 64, sixth discharge pump, 65, sixth flash tank, 71, seventh circulation pump, 72, seventh heater, 73, seventh separator, 81, eighth circulation pump, 82, eighth heater, 83, eighth separator, 100, material inlet, 101, material outlet, 102, emptying device, 103, secondary flash device, 104, heat exchanger, 105, washing water tank. DETAILED DESCRIPTION

[0017] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limitations of the present invention. On the contrary, embodiments of the present invention include all changes, modifications and equivalents that fall within the spirit and connotation of the appended claims.

[0018] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0019] In addition, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0020] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention belong.

[0021] like Figure 1 As shown, the present invention provides a clear liquid evaporation and concentration system for concentrating clear liquid, characterized in that: it includes a plurality of concentration stations, the plurality of concentration stations are connected in sequence, the clear liquid is gradually concentrated through the plurality of concentration stations in sequence, the concentration stations have a shell side loop and a tube side loop, the clear liquid enters the tube side loop, the shell side loop is connected with steam or condensed water for providing heat required for concentrating the clear liquid. During operation, the clear liquid with a dry matter content of 3.9% is gradually concentrated through the concentration stations in sequence to obtain a concentrated product with a dry matter content of 32%.

[0022] The concentration station includes a circulation pump 1, a heater 2 and a separator 3. In the tube-side loop, the circulation pump 1 pumps the clear liquid at the bottom of the heater 2 to the top of the heater 2, and a gas-liquid mixture outlet 4 is provided on the heater 2; in the shell-side loop, a steam inlet 5 and a condensed water outlet 6 are provided on the heater 2; a gas-liquid mixture inlet 7, a gas phase outlet 8 and a liquid phase outlet 9 are provided in the separator 3, the gas-liquid mixture outlet 4 is connected to the gas-liquid mixture inlet 7, and the liquid phase outlet 9 is connected to the inlet of the circulation pump 1.

[0023] The clear liquid flows in the heater 2 in a film-like manner from top to bottom, and exchanges heat with the steam or condensed water in the shell during the flow. The latent heat released by the steam or condensed water in the shell is used to heat the clear liquid to the boiling point and vaporize it to form a gas-liquid mixture. The gas-liquid mixture enters the separator 3 through the gas-liquid mixture outlet 4 and the gas-liquid mixture inlet 7 to complete gas-liquid separation. The separated steam enters the next heater 2 through the gas phase outlet 8 and the steam inlet 5 of the next concentration station. The separated liquid is mixed with the clear liquid at the bottom of the heater 2 through the liquid phase outlet 9, and is pumped into the next concentration station through the circulation pump 1.

[0024] Combination Figure 2 and Figure 3 As shown, the concentration stations are sequentially the first effect station, including the first circulation pump 11, the first heater 12 and the first separator 13; the second effect station, including the second circulation pump 21, the second heater 22 and the second separator 23; the third effect station, including the third circulation pump 31, the third heater 32 and the third separator 33; the fourth effect station, including the fourth circulation pump 41, the fourth heater 42 and the fourth separator 43; the fifth effect station, including the fifth circulation pump 51, the fifth heater 52 and the fifth separator 53; the sixth effect station, including the sixth circulation pump 61, the sixth heater 62, the sixth separator 63 and the sixth discharge pump 64; the seventh effect station, including the seventh circulation pump 71, the seventh heater 72 and the seventh separator 73; the clear liquid evaporation concentration system also includes the eighth effect station, including the eighth circulation pump 81, the eighth heater 82 and the eighth separator 83; in the pipe-side loop, the first separator 13 is provided with a material The material inlet 100, the first circulation pump 11 pumps the clear liquid treated by the first effect station into the second circulation pump 21; the second circulation pump 21 pumps the clear liquid treated by the second effect station into the third circulation pump 31; the third circulation pump 31 pumps the clear liquid treated by the third effect station into the fourth circulation pump 41; the fourth circulation pump 41 pumps the clear liquid treated by the fourth effect station into the fifth circulation pump 51; the fifth circulation pump 51 pumps the clear liquid treated by the fifth effect station into the sixth circulation pump 61; the sixth discharge pump 64 pumps the clear liquid treated by the sixth effect station into the seventh circulation pump 71; the seventh discharge pump pumps the clear liquid treated by the sixth effect station into the eighth separator 83, the eighth circulation pump 81 pumps the clear liquid at the bottom of the eighth separator 83 to the eighth heater 82, the eighth heater 82 is connected to the eighth separator 83, and the bottom of the kettle of the eighth heater 82 is provided with a material outlet 101.

[0025] In the shell-side loop, the steam is connected to the steam inlet 5 of the first heater 12, the gas phase outlet 8 of the first separator 13 is connected to the steam inlet 5 of the second heater 22, the gas phase outlet 8 of the second separator 23 is connected to the steam inlet 5 of the third heater 32 and the steam inlet 5 of the fourth heater 42, the gas phase outlet 8 of the third separator 33 and the gas phase outlet 8 of the fourth separator 43 are both connected to the steam inlet 5 of the sixth heater 62; the first heater 12 is provided with a first steam outlet, the first steam outlet is connected to the steam inlet 5 of the fifth heater 52, the fifth heater 52 is provided with an exhaust port, and the gas phase outlet 8 of the fifth separator 53 and the gas phase outlet 8 of the sixth separator 63 are both connected to an exhaust device 102.

[0026] A secondary flash evaporation device 103 is provided between the sixth effect station and the seventh effect station, a water inlet of the secondary flash evaporation device 103 is connected to a condensed water inlet pipe, and a steam outlet of the secondary flash evaporation device 103 is connected to the steam inlet 5 of the seventh heater 72 and the steam inlet 5 of the eighth heater 82.

[0027] A heat exchanger 104 is arranged between the sixth effect station and the seventh effect station, and the shell side of the heat exchanger 104 is respectively connected to the water outlet and the condensate drain pipe of the secondary flash evaporation device 103; the tube side of the heat exchanger 104 is respectively connected to the outlet of the sixth discharge pump 64 and the inlet of the seventh circulation pump 71.

[0028] The sixth effect station also includes a sixth flash tank 65. In the shell-side loop, the second heater 22, the third heater 32, the fourth heater 42, the fifth heater 52, the seventh heater 72 and the eighth heater 82 are all provided with condensate inlets, and the condensate outlet 6 of the second heater 22 is connected to the condensate inlet of the third heater 32; the condensate outlet 6 of the third heater 32, the condensate outlet 6 of the fourth heater 42 and the condensate outlet 6 of the sixth heater 62 are connected to the inlet of the sixth flash tank 65, and the steam outlet of the sixth flash tank 65 is connected to the shell side of the sixth heater 62; the condensate outlet 6 of the seventh heater 72 is connected to the condensate inlet of the eighth heater 82, and the condensate outlet 6 of the eighth heater 82 is connected to the condensate inlet of the second heater 22; the condensate outlet 6 of the first heater 12 and the condensate outlet 6 of the fifth heater 52 are connected to a washing water tank 105.

[0029] The clear liquid route during operation: the clear liquid enters the first separator 13 through the material inlet 100, is pumped into the top of the first heater 12 through the liquid phase outlet 9 of the first separator 13 and the first circulation pump 11, flows from top to bottom to the bottom of the first heater 12, is pumped into the top of the second heater 22 through the first circulation pump 11 and the second circulation pump 21; flows from top to bottom to the bottom of the second heater 22, is pumped into the top of the third heater 32 through the second circulation pump 21 and the third circulation pump 31; flows from top to bottom to the bottom of the third heater 32, is pumped into the top of the fourth heater 42 through the third circulation pump 31 and the fourth circulation pump 41; flows from top to bottom to the bottom of the fourth heater 42, is pumped into the top of the fourth heater 42 through the fourth circulation pump 41 and the fifth circulation pump 42. The liquid is pumped into the top of the fifth heater 52 by the pump 51; it flows from top to bottom to the bottom of the fifth heater 52 and is pumped into the top of the sixth heater 62 by the fifth circulation pump 51 and the sixth circulation pump 61; it flows from top to bottom to the bottom of the sixth heater 62 and is pumped into the heat exchanger 104 by the sixth discharge pump 64; after heat exchange with condensed water in the heat exchanger 104, it is pumped into the top of the seventh heater 72 by the seventh circulation pump 71; it flows from top to bottom to the bottom of the seventh heater 72 and is pumped into the seventh separator 73 by the seventh circulation pump 71, and is discharged through the liquid phase outlet 9 of the seventh separator 73, and is pumped into the top of the eighth heater 82 by the eighth circulation pump 81, and it flows from top to bottom to the bottom of the eighth separator 83 and is discharged from the material outlet 101.

[0030] There is a temperature gradient during the flow of steam, so two steam routes are used to ensure that each concentration station has sufficient latent heat for concentration operations.

[0031] The first steam route: the steam enters through the steam inlet 5 of the first heater 12, a part of the steam enters the fifth heater 52 through the first steam outlet and the steam inlet 5 of the fifth heater 52, enters the fifth separator 53 through the gas-liquid mixture outlet 4 of the fifth heater 52 and the gas-liquid mixture inlet 7 of the fifth separator 53, and is discharged into the exhaust device 102 from the gas phase outlet 8 of the fifth separator 53;

[0032] Another part of the steam enters the first separator 13 through the gas-liquid mixture outlet 4 of the first heater 12 and the gas-liquid mixture inlet 7 of the first separator 13, enters the second heater 22 through the gas phase outlet 8 of the first separator 13 and the steam inlet 5 of the second heater 22, enters the second separator 23 through the gas-liquid mixture outlet 4 of the second heater 22 and the gas-liquid mixture inlet 7 of the second separator 23, the gas phase outlet 8 of the second separator 23 is connected to the steam inlet 5 of the third heater 32 and the fourth heater 42, the steam enters the third heater 32, and enters the third separator 32 through the gas-liquid mixture outlet 4 of the third heater 32 and the gas-liquid mixture inlet 7 of the third separator 33. The steam enters the third separator 33, enters the sixth heater 62 through the gas phase outlet 8 of the third separator 33 and the steam inlet 5 of the sixth heater 62; the steam enters the fourth heater 42, enters the fourth separator 43 through the gas-liquid mixture outlet 4 of the fourth heater 42 and the gas-liquid mixture inlet 7 of the fourth separator 43, and enters the sixth heater 62 through the gas phase outlet 8 of the fourth separator 43 and the steam inlet 5 of the sixth heater 62; the steam enters the sixth heater 62, enters the sixth separator 63 through the gas-liquid mixture outlet 4 of the sixth heater 62 and the gas-liquid mixture inlet 7 of the sixth separator 63, and is discharged into the emptying device 102 through the gas phase outlet 8 of the sixth separator 63.

[0033] The second steam route: Steam enters the steam through the steam inlet 5 of the seventh heater 72, and successively enters the seventh separator 73 through the gas-liquid mixture outlet 4 of the seventh heater 72 and the gas-liquid mixture inlet 7 of the seventh separator 73, and enters the eighth heater 82 through the gas phase outlet 8 of the seventh separator 73 and the steam inlet 5 of the eighth heater 82; enters the eighth separator 83 through the gas-liquid mixture outlet 4 of the eighth heater 82 and the gas-liquid mixture inlet 7 of the eighth separator 83, and enters the second heater 22 through the gas phase outlet 8 of the eighth separator 83 and the steam inlet 5 of the second heater 22.

[0034] Condensate route: The condensed water enters the secondary flash evaporation device 103 to flash and form steam, which enters the seventh heater 72 and the eighth heater 82. The condensed water discharged from the secondary flash evaporation device 103 exchanges heat with the clear liquid through the heat exchanger 104 and is then discharged from the drain pipe.

[0035] The condensate route formed in the shell of the heat exchanger 104: the condensate outlet 6 of the seventh heater 72 is connected to the condensate inlet of the eighth heater 82, the condensate outlet 6 of the eighth heater 82 is connected to the condensate inlet of the second heater 22, the condensate outlet 6 of the second heater 22 is connected to the condensate inlet of the third heater 32, the condensate of the third heater 32, the fourth heater 42 and the sixth heater 62 enter the sixth flash tank 65 through the condensate outlet 6 to be flashed into steam and enter the sixth heater 62 for use, and the excess condensate is discharged from the bottom of the kettle.

[0036] Since the condensed water formed in the first effect station and the fifth effect station is seriously polluted, this part of the condensed water is discharged into the washing water tank 105.

[0037] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0038] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A clear liquid evaporation and concentration system for concentrating clear liquid, characterized in that: It includes several concentration stations, which are connected in sequence, and the clear liquid is gradually concentrated by passing through the several concentration stations in sequence. The concentration station has a shell-side loop and a tube-side loop, the clear liquid enters the tube-side loop, and the shell-side loop is connected with steam or condensed water for providing heat required for concentrating the clear liquid; The concentration station includes a circulation pump, a heater and a separator. In the tube-side loop, the circulation pump pumps the clear liquid at the bottom of the heater to the top of the heater, and a gas-liquid mixture outlet is provided on the heater; In the shell-side loop, a steam inlet and a condensed water outlet are provided on the heater; The separator is provided with a gas-liquid mixture inlet, a gas phase outlet and a liquid phase outlet, the gas-liquid mixture outlet is communicated with the gas-liquid mixture inlet, and the liquid phase outlet is communicated with the inlet of the circulation pump; The concentration stations are: The first effect station includes a first circulation pump, a first heater and a first separator; The second effect station includes a second circulation pump, a second heater and a second separator; A third effect station, including a third circulation pump, a third heater and a third separator; a fourth effect station, comprising a fourth circulation pump, a fourth heater and a fourth separator; a fifth effect station, comprising a fifth circulation pump, a fifth heater and a fifth separator; The sixth effect station includes a sixth circulation pump, a sixth heater, a sixth separator and a sixth discharge pump; a seventh effect station, comprising a seventh circulation pump, a seventh heater and a seventh separator; The clear liquid evaporation and concentration system also includes an eighth effect station, including an eighth circulation pump, an eighth heater and an eighth separator; In the pipe-side loop, a material inlet is provided on the first separator, the first circulation pump pumps the clear liquid treated by the first effect station into the second circulation pump; the second circulation pump pumps the clear liquid treated by the second effect station into the third circulation pump; the third circulation pump pumps the clear liquid treated by the third effect station into the fourth circulation pump; the fourth circulation pump pumps the clear liquid treated by the fourth effect station into the fifth circulation pump; the fifth circulation pump pumps the clear liquid treated by the fifth effect station into the sixth circulation pump; the sixth discharge pump pumps the clear liquid treated by the sixth effect station into the seventh circulation pump; the seventh circulation pump pumps the clear liquid treated by the seventh effect station into the eighth separator, the eighth circulation pump pumps the clear liquid at the bottom of the eighth separator to the eighth heater, the eighth heater is connected to the eighth separator, and the bottom of the kettle of the eighth separator is provided with a material outlet; In the shell-side loop, the steam is connected to the steam inlet of the first heater, the gas phase outlet of the first separator is connected to the steam inlet of the second heater, the gas phase outlet of the second separator is connected to the steam inlet of the third heater and the steam inlet of the fourth heater, and the gas phase outlet of the third separator and the gas phase outlet of the fourth separator are both connected to the steam inlet of the sixth heater; the first heater is provided with a first steam outlet, the first steam outlet is connected to the steam inlet of the fifth heater, the fifth heater is provided with an exhaust port, and the gas phase outlet of the fifth separator and the gas phase outlet of the sixth separator are both connected to an exhaust device; A secondary flash evaporation device is provided between the sixth effect station and the seventh effect station, the water inlet of the secondary flash evaporation device is connected to a condensed water inlet pipe, and the steam outlet of the secondary flash evaporation device is connected to the steam inlet of the seventh heater and the steam inlet of the eighth heater; A heat exchanger is arranged between the sixth effect station and the seventh effect station, and the shell side of the heat exchanger is respectively connected to the water outlet and the condensate drain pipe of the secondary flash evaporation device; the tube side of the heat exchanger is respectively connected to the outlet of the sixth discharge pump and the inlet of the seventh circulation pump.

2. The clear liquid evaporation and concentration system according to claim 1, characterized in that: The sixth effect station also includes a sixth flash tank, In the shell-side circuit, the second heater, the third heater, the fourth heater, the fifth heater, the seventh heater and the eighth heater are all provided with a condensed water inlet, and the condensed water outlet of the second heater is connected to the condensed water inlet of the third heater; The condensate outlet of the third heater, the condensate outlet of the fourth heater and the condensate outlet of the sixth heater are connected to the inlet of the sixth flash tank, and the steam outlet of the sixth flash tank is connected to the shell side of the sixth heater; The condensate outlet of the seventh heater is connected to the condensate inlet of the eighth heater, and the condensate outlet of the eighth heater is connected to the condensate inlet of the second heater; the condensate outlet of the first heater and the condensate outlet of the fifth heater are connected to a washing water tank.

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