A cryogenic evaporation system with machine seal cooling

Abstract

The utility model discloses a low temperature evaporation system with machine seal cooling, and the raw water tank G is connected with the evaporation tower T1 and T2 through the raw liquid pump P1, and the condensation tower T3 and T4 are connected with the water pipeline, the evaporation tower T1 is connected with the heat exchanger R1, R2 1, R2 2 through the tower one circulating pump P2, the heat exchanger R1 is connected with the heat exchanger R2 1 and R2 2, the heat exchanger R2 1 and R2 2 are connected with the evaporation tower T2, the evaporation tower T2, the tower two circulating pump P3, the evaporation tower T1 are connected, the condensation tower T3, the tower three circulating pump P4, the heat exchanger R1, the heat exchanger R3, the condensation tower T4, the tower four circulating pump P5 are closed connection, two evaporation towers are connected with the thick liquid tank N, and the thick liquid tank N is connected with the thick liquid tank N, and each pump is connected with the machine seal circulating tank F. The utility model discloses when running can be adjusted according to actual demand flexibly, effectively prevents the precipitate and has the machine seal cooling function and possesses the machine seal cooling function, and the treatment effect is good.

Description

Technical Field

[0001] This utility model relates to the field of evaporation and condensation technology, and in particular to a low-temperature evaporation system with mechanical seal cooling. Background Technology

[0002] Currently, high-salt liquids are typically treated using low-temperature evaporation. This involves first heating the waste liquid to create a concentrated liquid and vapor, then condensing the vapor back into liquid. This method allows for the recovery of necessary substances from the waste liquid for recycling while also meeting waste liquid discharge requirements. However, most current treatment systems rely on a fixed, single heating and condensation process, lacking flexibility in process adjustments. Furthermore, sediments tend to settle and adhere to the bottom of the tower, resulting in unsatisfactory treatment outcomes. Additionally, long-term operation of the system leads to continuous high temperatures in the pumps, affecting their lifespan. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a low-temperature evaporation system with mechanical seal cooling, which aims to solve the technical problems existing in the prior art, such as the inability to flexibly adjust the processing process, the easy settling of precipitates on the bottom of the tower body affecting the processing effect, and the continuous high temperature of the working pump caused by long-term operation, which affects the service life.

[0004] The technical solution of this utility model is: a low-temperature evaporation system with mechanical seal cooling, including a raw water tank G, an evaporation tower T1, an evaporation tower T2, a condensation tower T3, a condensation tower T4, a heat exchanger R1, a heat exchanger R2-1, a heat exchanger R2-2, a heat exchanger R3, a mechanical seal circulation tank F, and a concentrated liquid tank N. The raw water tank G is connected to the evaporation tower T1 and the evaporation tower T2 respectively via the raw liquid pump P1, and the condensation tower T3 and the condensation tower T4 are respectively connected to pipes for introducing tap water. Evaporation tower T1 is connected to the raw liquid inlets of heat exchangers R1, R2-1, and R2-2 via a tower-one circulation pump P2. The raw liquid outlet of heat exchanger R1 is connected to the raw liquid inlets of heat exchangers R2-1 and R2-2. The raw liquid outlets of heat exchangers R2-1 and R2-2 are connected to evaporation tower T2. Evaporation tower T2 is also connected to evaporation tower T1 via a tower-two circulation pump P3. Condensation tower T3 is connected to the tap water inlet of heat exchanger R1 via a tower-three circulation pump P4. The tap water outlet of heat exchanger R1 is connected to the tap water inlet of heat exchanger R3. The tap water outlet of heat exchanger R3 is connected to condensation tower T4. Condensation tower T4 is also connected to condensation tower T3 via a tower-four circulation pump P5. The evaporator T1 is connected to a pipe for air intake, and the evaporator T1, evaporator T2, condenser T3, and condenser T4 are connected in sequence. The condenser T4 is also connected to a pipe for air outlet. The bottom of the evaporator T1 is connected to a T1 concentrated discharge circulation pipe, and a concentrated discharge circulation pump P7-1 is installed on the T1 concentrated discharge circulation pipe. The bottom of the evaporator T2 is connected to a T2 concentrated discharge circulation pipe, and a concentrated discharge circulation pump P7-2 is installed on the T2 concentrated discharge circulation pipe. The T1 concentrated discharge circulation pipe and the T2 concentrated discharge circulation pipe are also respectively connected to the concentrated liquid tank N. The raw liquid pump P1, tower one circulation pump P2, tower two circulation pump P3, tower three circulation pump P4, tower four circulation pump P5, concentrate discharge circulation pump P7-1, and concentrate discharge circulation pump P7-2 are respectively connected to the mechanical seal circulation tank F for cooling.

[0005] Furthermore, in this utility model, the raw liquid pump P1 is connected to a pipe CWW-0101, which is connected to the bottom of the evaporation tower T1 via pipe CWW-0102 and manual butterfly valve DF02. Pipe CWW-0101 is also connected to the bottom of the evaporation tower T2 via manual butterfly valve DF03 and pipe CWW-0103. The top of the condensation tower T3 is connected to a pipe LW-0104 for introducing tap water, and the top of the condensation tower T4 is connected to a pipe LW-0105 for introducing tap water.

[0006] Furthermore, in this invention, the tower-one circulating pump P2 is connected to the bottom of the evaporation tower T1. The tower-one circulating pump P2 is also connected to pipe CWW-0204 via pipe CWW-0202 and manual butterfly valve DF05. Pipe CWW-0202 is connected to the raw liquid inlet of heat exchanger R1 via manual butterfly valve DF06. Pipe CWW-0204 is connected to the raw liquid inlet of heat exchanger R2-1 via manual butterfly valve DF08. Pipe CWW-0204 is connected to the raw liquid inlet of heat exchanger R2-2 via manual butterfly valve DF09. The raw liquid outlet of heat exchanger R1 is connected to pipe CWW-0204 via manual butterfly valve DF07 and pipe CWW-0203. The raw liquid outlet of heat exchanger R2-1 is connected to the top of evaporation tower T2 via manual butterfly valve DF10, pipe CWW-0205, and pipe CWW-0207. The raw liquid outlet of heat exchanger R2-2 is connected to pipe CWW-0207 via manual butterfly valve DF11 and pipe CWW-0206. The second-stage circulation pump P3 is connected between the bottom of evaporation tower T2 and the top of evaporation tower T1.

[0007] Furthermore, in this utility model, the three-stage circulation pump P4 is connected between the bottom of the condensing tower T3 and the tap water inlet of the heat exchanger R1, the tap water outlet of the heat exchanger R1 is connected to the tap water inlet of the heat exchanger R3, and the tap water outlet of the heat exchanger R3 is connected to the top of the condensing tower T4; the four-stage circulation pump P5 is connected between the bottom of the condensing tower T4 and the top of the condensing tower T3.

[0008] Furthermore, in this utility model, the steam inlets of heat exchangers R2-1 and R2-2 are connected to the steam inlet pipes via shut-off valves JZF01 and JZF02, respectively, and the steam outlets of heat exchangers R2-1 and R2-2 are connected to the steam outlet pipes via shut-off valves JZF03 and JZF04, respectively; the cooling water inlet of heat exchanger R3 is connected to the cooling water inlet pipe via a manual butterfly valve DF19, and the cooling water outlet of heat exchanger R3 is connected to the cooling water outlet pipe via a manual butterfly valve DF20.

[0009] Furthermore, in this utility model, the bottom of the evaporator T1 is connected to a pipe GS-0102 for air intake, the top of the evaporator T1 is connected to the bottom of the evaporator T2 via pipe GS-0103, the top of the evaporator T2 is connected to the bottom of the condenser T3 via pipe GS-0104, the top of the condenser T3 is connected to the bottom of the condenser T4 via pipe GS-0105, and the top of the condenser T4 is connected to a pipe GS-0106 for air outlet.

[0010] Furthermore, the T1 condensate discharge circulation pipeline in this utility model includes a manual butterfly valve DF21 connected to one side of the bottom of the evaporator T1. The manual butterfly valve DF21 is connected to the condensate discharge circulation pump P7-1 via pipeline CNW-0101 and flexible joint RJ13. The condensate discharge circulation pump P7-1 is also connected to the bottom of the evaporator T1 via flexible joint RJ15, check valve ZH07, pneumatic butterfly valve QD01, pipeline CNW-0102, and manual butterfly valve DF23. The other side is connected; the T2 condensate discharge circulation pipeline includes a manual butterfly valve DF24 connected to one side of the bottom of the evaporator T2. The manual butterfly valve DF24 is connected to the condensate discharge circulation pump P7-2 through pipeline CNW-0201 and flexible joint RJ14. The condensate discharge circulation pump P7-2 is also connected to the other side of the bottom of the evaporator T2 through flexible joint RJ16, check valve ZH08, pneumatic butterfly valve QD04, pipeline CNW-0202, and manual butterfly valve DF26.

[0011] Furthermore, in this utility model, a manual butterfly valve DF22 is connected to the pipeline between the check valve ZH07 and the pneumatic butterfly valve QD01. The manual butterfly valve DF22 is connected to the concentrate tank N via the pneumatic butterfly valve QD02 and the pipeline CNW-0103. A manual butterfly valve DF25 is connected to the pipeline between the check valve ZH08 and the pneumatic butterfly valve QD04. The manual butterfly valve DF25 is connected to the pipeline CNW-0103 via the pneumatic butterfly valve QD03.

[0012] Furthermore, in this utility model, the outlet of the mechanical seal circulation tank F is connected to pipe CWR-01 via circulation pump P8 and ball valve QF15, and the return outlet of the mechanical seal circulation tank F is connected to pipe CWS-01 via ball valve QF14; the fourth tower circulation pump P5 is connected to pipe CWR-01 and pipe CWS-01 via ball valves QF28 and QF29 respectively; the third tower circulation pump P4 is connected to pipe CWR-01 and pipe CWS-01 via ball valves QF26 and QF27 respectively; and the second tower circulation pump P3 is connected to pipe CWR-01 via ball valves QF24 and QF25 respectively. 1. Connected to the pipeline CWS-01, the tower-1 circulation pump P2 is connected to the pipeline CWR-01 and the pipeline CWS-01 via ball valves QF22 and QF23 respectively, the raw liquid pump P1 is connected to the pipeline CWR-01 and the pipeline CWS-01 via ball valves QF20 and QF21 respectively, the concentrate discharge circulation pump P7-1 is connected to the pipeline CWR-01 and the pipeline CWS-01 via ball valves QF17 and QF16 respectively, and the concentrate discharge circulation pump P7-2 is connected to the pipeline CWR-01 and the pipeline CWS-01 via ball valves QF18 and QF19 respectively.

[0013] Compared with the prior art, this utility model has the following advantages: This utility model uses two evaporation towers to circulate and evaporate high-salt liquids. The system operation can be flexibly adjusted according to actual needs, including a rapid heating stage and a stable operation stage, which greatly improves the treatment effect compared with traditional treatment systems. By adding a concentrated liquid discharge circulation pipe at the bottom of evaporation towers T1 and T2, the liquid in the tower can be effectively circulated, preventing precipitates from settling and adhering to the tower body. The concentrated liquid is discharged to the concentrated liquid tank N after the raw liquid reaches the set density value. At the same time, the system also has a mechanical seal cooling function, which is always open during operation, thereby effectively helping to cool the mechanical seal of the working pump and ensuring stable pump operation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the system structure of this utility model. Detailed Implementation

[0015] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0016] Example: The accompanying drawings illustrate a specific embodiment of a low-temperature evaporation system with mechanical seal cooling according to this utility model. Figure 1 It mainly includes raw water tank G, evaporator T1, evaporator T2, condenser T3, condenser T4, heat exchanger R1, heat exchanger R2-1, heat exchanger R2-2, heat exchanger R3, mechanical seal circulation tank F, and concentrated liquid tank N.

[0017] Raw water tank G is connected to evaporation towers T1 and T2 via raw liquid pump P1, allowing wastewater to be treated to be introduced into each tower. Raw liquid pump P1 is connected to pipe CWW-0101, which is connected to the bottom of evaporation tower T1 via pipe CWW-0102 and manual butterfly valve DF02. Pipe CWW-0101 is also connected to the bottom of evaporation tower T2 via manual butterfly valve DF03 and pipe CWW-0103.

[0018] The top of condenser T3 is connected to a pipe LW-0104 for supplying tap water, and the top of condenser T4 is connected to a pipe LW-0105 for supplying tap water.

[0019] Evaporator T1 is connected to the raw liquid inlets of heat exchangers R1, R2-1, and R2-2 via a circulating pump P2. Specifically, circulating pump P2 is connected to the bottom of evaporator T1. Circulating pump P2 is also connected to pipe CWW-0204 via pipe CWW-0202 and manual butterfly valve DF05. Pipe CWW-0202 is connected to the raw liquid inlet of heat exchanger R1 via manual butterfly valve DF06. Pipe CWW-0204 is connected to the raw liquid inlet of heat exchanger R2-1 via manual butterfly valve DF08. Pipe CWW-0204 is connected to the raw liquid inlet of heat exchanger R2-2 via manual butterfly valve DF09.

[0020] The raw liquid outlet of heat exchanger R1 is connected to the top of evaporator T2 via manual butterfly valve DF07, pipe CWW-0203, and pipe CWW-0204. The raw liquid outlet of heat exchanger R2-1 is connected to the top of evaporator T2 via manual butterfly valve DF10, pipe CWW-0205, and pipe CWW-0207. The raw liquid outlet of heat exchanger R2-2 is connected to the top of evaporator T2 via manual butterfly valve DF11, pipe CWW-0206, and pipe CWW-0207.

[0021] Evaporator T2 is also connected to evaporator T1 via evaporator circulation pump P3, which is located between the bottom of evaporator T2 and the top of evaporator T1 for circulating evaporation.

[0022] Condensing tower T3 is connected to the tap water inlet of heat exchanger R1 via tower three circulation pump P4. Tower three circulation pump P4 is connected between the bottom of condensing tower T3 and the tap water inlet of heat exchanger R1. The tap water outlet of heat exchanger R1 is connected to the tap water inlet of heat exchanger R3, and the tap water outlet of heat exchanger R3 is connected to the top of condensing tower T4.

[0023] Condensing tower T4 is also connected to condensing tower T3 via tower four circulation pump P5, which is located between the bottom of condensing tower T4 and the top of condensing tower T3.

[0024] Heat exchangers R2-1 and R2-2 are connected to steam pipes. Specifically, the steam inlets of heat exchangers R2-1 and R2-2 are connected to the steam inlet pipes through shut-off valves JZF01 and JZF02, respectively, and the steam outlets of heat exchangers R2-1 and R2-2 are connected to the steam outlet pipes through shut-off valves JZF03 and JZF04, respectively.

[0025] Heat exchanger R3 is connected to a cooling water pipe. Specifically, the cooling water inlet of heat exchanger R3 is connected to a cooling water inlet pipe via a manual butterfly valve DF19, and the cooling water outlet of heat exchanger R3 is connected to a cooling water outlet pipe via a manual butterfly valve DF20.

[0026] The bottom of evaporator T1 is connected to a duct GS-0102 for air intake. The top of evaporator T1 is connected to the bottom of evaporator T2 via duct GS-0103. The top of evaporator T2 is connected to the bottom of condenser T3 via duct GS-0104. The top of condenser T3 is connected to the bottom of condenser T4 via duct GS-0105. The top of condenser T4 is connected to a duct GS-0106 for air outlet.

[0027] Furthermore, the bottom of evaporator T1 is connected to a T1 condensate discharge circulation pipeline, on which a condensate discharge circulation pump P7-1 is installed. Specifically, the T1 condensate discharge circulation pipeline includes a manual butterfly valve DF21 connected to one side of the bottom of evaporator T1. Manual butterfly valve DF21 is connected to condensate discharge circulation pump P7-1 via pipeline CNW-0101 and flexible connector RJ13. Concentrate discharge circulation pump P7-1 is also connected to the other side of the bottom of evaporator T1 via flexible connector RJ15, check valve ZH07, pneumatic butterfly valve QD01, pipeline CNW-0102, and manual butterfly valve DF23. The height of the pipeline connecting manual butterfly valve DF21 to evaporator T1 is lower than the height of the pipeline connecting manual butterfly valve DF23 to evaporator T1.

[0028] The bottom of evaporator T2 is connected to a T2 condensate discharge circulation pipeline, which is equipped with a condensate discharge circulation pump P7-2. Specifically, the T2 condensate discharge circulation pipeline includes a manual butterfly valve DF24 connected to one side of the bottom of evaporator T2. Manual butterfly valve DF24 is connected to condensate discharge circulation pump P7-2 via pipeline CNW-0201 and flexible connector RJ14. Concentrate discharge circulation pump P7-2 is also connected to the other side of the bottom of evaporator T2 via flexible connector RJ16, check valve ZH08, pneumatic butterfly valve QD04, pipeline CNW-0202, and manual butterfly valve DF26. The height of the pipeline connecting manual butterfly valve DF24 to evaporator T2 is lower than the height of the pipeline connecting manual butterfly valve DF26 to evaporator T2.

[0029] The T1 and T2 concentrated liquid discharge circulation pipelines are also connected to the concentrated liquid tank N for discharging concentrated liquid. Specifically, a manual butterfly valve DF22 is connected to the pipeline between check valve ZH07 and pneumatic butterfly valve QD01. The manual butterfly valve DF22 is connected to the concentrated liquid tank N via pneumatic butterfly valve QD02 and pipeline CNW-0103. A manual butterfly valve DF25 is connected to the pipeline between check valve ZH08 and pneumatic butterfly valve QD04. The manual butterfly valve DF25 is connected to the pipeline CNW-0103 via pneumatic butterfly valve QD03.

[0030] Furthermore, the raw liquid pump P1, the first tower circulation pump P2, the second tower circulation pump P3, the third tower circulation pump P4, the fourth tower circulation pump P5, the concentrate discharge circulation pump P7-1, and the concentrate discharge circulation pump P7-2 are respectively connected to the mechanical seal circulation tank F for cooling. Specifically, the outlet of the mechanical seal circulation tank F is connected to pipe CWR-01 via circulating water pump P8 and ball valve QF15, and the return water outlet of the mechanical seal circulation tank F is connected to pipe CWS-01 via ball valve QF14. Tower 4 circulation pump P5 is connected to pipelines CWR-01 and CWS-01 via ball valves QF28 and QF29 respectively. Tower 3 circulation pump P4 is connected to pipelines CWR-01 and CWS-01 via ball valves QF26 and QF27 respectively. Tower 2 circulation pump P3 is connected to pipelines CWR-01 and CWS-01 via ball valves QF24 and QF25 respectively. Tower 1 circulation pump P2 is connected to pipelines CWR-01 and CWS-01 via ball valves QF22 and QF23 respectively. Do not connect to pipelines CWR-01 and CWS-01. The raw material pump P1 is connected to pipelines CWR-01 and CWS-01 via ball valves QF20 and QF21, respectively. The concentrate discharge circulation pump P7-1 is connected to pipelines CWR-01 and CWS-01 via ball valves QF17 and QF16, respectively. The concentrate discharge circulation pump P7-2 is connected to pipelines CWR-01 and CWS-01 via ball valves QF18 and QF19, respectively.

[0031] When the system of this utility model is in operation, it includes the following steps: I. Before starting the equipment 1.1 Add raw liquid of appropriate level to evaporator T1 through raw water tank G, raw liquid pump P1, pipeline CWW-0101, pipeline CWW-0102, and manual butterfly valve DF02. Manual butterfly valve DF03 is closed throughout the process.

[0032] 1.2 Add raw liquid to evaporator T2 at the appropriate level through raw water tank G, raw liquid pump P1, pipeline CWW-0101, manual butterfly valve DF03, and pipeline CWW-0103. Manual butterfly valve DF02 is closed throughout the entire process.

[0033] 1.3 Add tap water to the appropriate level into the condenser T3 through pipe LW-0104.

[0034] 1.4 Add tap water to the appropriate level into the condenser T4 through pipe LW-0105.

[0035] 1.5 The air duct system is as follows: fresh air is discharged through duct GS-0102, evaporator T1, duct GS-0103, evaporator T2, duct GS-0104, condenser T3, duct GS-0105, condenser T4, and duct GS-0106, and is completely shut off after a certain period of time.

[0036] II. Equipment Start-up 2.1 Mechanical Seal Cooling System The mechanical seal circulating water in the mechanical seal circulation tank F flows to the fourth tower circulation pump P5 via circulating water pump P8, ball valve QF15, pipeline CWR-01, and ball valve QF28, and then flows back to the mechanical seal circulation tank F via ball valve QF29, pipeline CWS-01, and ball valve QF14. This process cools the mechanical seal of the fourth tower circulation pump P5.

[0037] The mechanical seal circulating water in the mechanical seal circulation tank F flows to the tower three circulation pump P4 via circulating water pump P8, ball valve QF15, pipeline CWR-01, and ball valve QF26, and then flows back to the mechanical seal circulation tank F via ball valve QF27, pipeline CWS-01, and ball valve QF14. This serves to cool the mechanical seal of the tower three circulation pump P4.

[0038] The mechanical seal circulating water in the mechanical seal circulation tank F flows to the second tower circulation pump P3 via circulating water pump P8, ball valve QF15, pipeline CWR-01, and ball valve QF24, and then flows back to the mechanical seal circulation tank F via ball valve QF25, pipeline CWS-01, and ball valve QF14. This serves to cool the mechanical seal of the second tower circulation pump P3.

[0039] The mechanical seal circulating water in the mechanical seal circulation tank F flows to the tower-one circulation pump P2 via circulating water pump P8, ball valve QF15, pipeline CWR-01, and ball valve QF22, and then flows back to the mechanical seal circulation tank F via ball valve QF23, pipeline CWS-01, and ball valve QF14. This process cools the mechanical seal of the tower-one circulation pump P2.

[0040] The mechanical seal circulating water in the mechanical seal circulation tank F flows to the raw material pump P1 through the circulating water pump P8, ball valve QF15, pipeline CWR-01, and ball valve QF20, and then flows back to the mechanical seal circulation tank F through ball valve QF21, pipeline CWS-01, and ball valve QF14. This serves to cool the mechanical seal of the raw material pump P1.

[0041] The mechanical seal circulating water in the mechanical seal circulation tank F flows to the concentrate removal circulation pump P7-1 via circulating water pump P8, ball valve QF15, pipeline CWR-01, and ball valve QF17, and then flows back to the mechanical seal circulation tank F via ball valve QF16, pipeline CWS-01, and ball valve QF14. This serves to cool the mechanical seal of the concentrate removal circulation pump P7-1.

[0042] The mechanical seal circulating water in the mechanical seal circulation tank F flows to the concentrate removal circulation pump P7-2 via circulating water pump P8, ball valve QF15, pipeline CWR-01, and ball valve QF18, and then flows back to the mechanical seal circulation tank F via ball valve QF19, pipeline CWS-01, and ball valve QF14. This serves to cool the mechanical seal of the concentrate removal circulation pump P7-2.

[0043] Note: The mechanical seal cooling system is always open during equipment startup.

[0044] 2.2 Rapid Heating Stage During Start-up of Evaporator T1, Evaporator T2, Condensator T3, and Condensator T4 2.2.1 The raw liquid inside evaporator T1 flows from the bottom of evaporator T1 to the top of evaporator T2 via circulating pump P2, pipe CWW-0202, manual butterfly valve DF05, pipe CWW-0204, manual butterfly valve DF08, heat exchanger R2-1 (S2 inlet, S1 outlet), manual butterfly valve DF10, pipe CWW-0205, and pipe CWW-0207. At this time, manual butterfly valves DF06, DF07, DF09, and DF11 are closed, stop valves JZF01 and JZF03 are open, and stop valves JZF02 and JZF04 are closed. The raw liquid from evaporator T1 to evaporator T2 is heated to the expected evaporation temperature through heat exchanger R2-1.

[0045] 2.2.2 The raw liquid inside evaporator T2 flows from the bottom of evaporator T2 to the top of evaporator T1 through the second circulation pump P3.

[0046] 2.2.3 The tap water inside the condenser T3 flows from the bottom of the condenser T3 through the three-stage circulation pump P4, heat exchanger R1 (S3 inlet, S4 outlet) and heat exchanger R3 (S4 inlet, S3 outlet) to the top of the condenser T4. At this time, manual butterfly valves DF19 and DF20 are closed.

[0047] 2.2.4 The tap water inside condenser T4 flows from the bottom of condenser T4 to the top of condenser T3 through the four-tower circulation pump P5.

[0048] 2.2.5 Steam in the steam pipeline is discharged into the sewer through shut-off valve JZF01, heat exchanger R2-1 (S3 inlet and S4 outlet of heat exchanger R2-1), and shut-off valve JZF03. At this time, shut-off valves JZF02 and JZF04 are in the closed state.

[0049] 2.2.6 The manual butterfly valves DF19 and DF20 of the cooling water pipeline are closed.

[0050] 2.2.7 Air duct system: Fresh air is discharged into RTO via duct GS-0102, evaporator T1, duct GS-0103, evaporator T2, duct GS-0104, condenser T3, duct GS-0105, condenser T4, and duct GS-0106.

[0051] 2.2.8 There is no liquid flow in the T1 concentrated discharge circulation pipe of evaporator T1.

[0052] 2.2.9 There is no liquid flow in the T2 concentrated discharge circulation pipe of evaporator T2.

[0053] 2.2.10 Raw material pipeline system: As evaporation proceeds in evaporator T1 and evaporator T2, when the liquid level in evaporator T1 reaches the set minimum value, raw material at a suitable level is added to evaporator T1 through raw water tank G. When the liquid level rises to the set value, raw material pump P1 is shut off. The manual butterfly valve DF03 is closed throughout the entire process.

[0054] 2.3 Stable evaporation stages in evaporator T1 and T2, and stable condensation stages in condenser T3 and T4. 2.3.1 The raw liquid inside evaporator T1 flows from the bottom of evaporator T1 through the circulation pump P2, manual butterfly valve DF06, heat exchanger R1 (S2 inlet, S1 outlet), manual butterfly valve DF07, pipes CWW-0203 and CWW-0204, manual butterfly valve DF08, heat exchanger R2-1 (S2 inlet, S1 outlet), manual butterfly valve DF10, pipes CWW-0205 and CWW-0207 to the top of evaporator T2. At this time, manual butterfly valves DF05, DF09, and DF11 are closed, stop valves JZF01 and JZF03 are open, and stop valves JZF02 and JZF04 are closed. The raw liquid in evaporation towers T1 and T2 is first preheated through heat exchanger R1, and then further heated to the expected evaporation temperature through heat exchanger R2-1 (the liquid in evaporation towers T1 and T2 absorbs heat from the liquid in condensation towers T3 and T4 through heat exchanger R1, and the liquid in evaporation towers T1 and T2 is heated to the set temperature through heat exchanger R2-1). It should be noted that heat exchanger R2-2 can be used interchangeably with heat exchanger R2-1 as needed. The raw liquid enters from S4 and exits from S3 in heat exchanger R2-2, and the steam in the steam pipeline enters from S1 and exits from S2 in heat exchanger R2-2.

[0055] 2.3.2 The flow from evaporator T2 to evaporator T1 is the same as in 2.2.2. 2.3.3 The flow from condenser T3 to condenser T4 is the same as in 2.2.3. 2.3.4 The flow from condenser T4 to condenser T3 is the same as in 2.2.4. 2.3.5 Steam piping is the same as 2.2.5. 2.3.6 When the manual butterfly valves DF19 and DF20 of the cooling water pipeline are opened, the cooling water flows through the heat exchanger R3 (S1 inlet and S2 outlet of heat exchanger R3).

[0056] 2.3.7 The ventilation system is the same as 2.2.7. 2.3.8 When the density of the raw liquid inside evaporator T1 falls below the set value, at regular intervals, manual butterfly valve DF21, pneumatic butterfly valve QD01, manual butterfly valve DF23, and the concentrate removal circulation pump P7-1 open, while pneumatic butterfly valve QD02 closes. The raw liquid flows back to evaporator T1 through manual butterfly valve DF21, pipeline CNW-0101, flexible joint RJ13, concentrate removal circulation pump P7-1, flexible joint RJ15, check valve ZH07, pneumatic butterfly valve QD01, pipeline CNW-0102, and manual butterfly valve DF23. Circulation of the concentrated liquid at the bottom stops after the set time. Its function is to circulate the liquid inside evaporator T1 and prevent sediment from settling and adhering to the tower body.

[0057] 2.3.9 When the density of the raw liquid inside evaporator T2 falls below the set value, at regular intervals, manual butterfly valve DF24, pneumatic butterfly valve QD04, manual butterfly valve DF26, and the concentrate removal circulation pump P7-2 open, while pneumatic butterfly valve QD03 closes. The raw liquid flows back to evaporator T2 through manual butterfly valve DF24, pipeline CNW-0201, flexible connector RJ14, concentrate removal circulation pump P7-2, flexible connector RJ16, check valve ZH08, pneumatic butterfly valve QD04, pipeline CNW-0202, and manual butterfly valve DF26. Circulation of the concentrated liquid at the bottom stops after the set time. Its function is to circulate the liquid inside evaporator T2 and prevent sediment from settling and adhering to the tower body.

[0058] 2.4 Concentration Removal Stage When the raw liquid inside evaporator T1 or evaporator T2 reaches the set density value, all equipment except the mechanical seal cooling system is shut down. On the T1 discharge circulation pipeline of evaporator T1, the manual butterfly valve DF21, discharge circulation pump P7-1, manual butterfly valve DF22, and pneumatic butterfly valve QD02 are opened. The raw liquid flows through manual butterfly valve DF21, pipeline CNW-0101, flexible joint RJ13, discharge circulation pump P7-1, flexible joint RJ15, check valve ZH07, manual butterfly valve DF22, pneumatic butterfly valve QD02, and pipeline CNW-0103 to discharge into the concentrate tank N.

[0059] After the liquid in evaporator T1 is emptied, the manual butterfly valve DF24, the concentrated liquid circulation pump P7-2, the manual butterfly valve DF25, and the pneumatic butterfly valve QD03 on the T2 concentrated liquid circulation pipeline of evaporator T2 are opened. The raw liquid flows through the manual butterfly valve DF24, pipeline CNW-0201, flexible joint RJ14, concentrated liquid circulation pump P7-2, flexible joint RJ16, check valve ZH08, manual butterfly valve DF25, pneumatic butterfly valve QD03, and pipeline CNW-0103 to the concentrated liquid tank N.

[0060] The above process constitutes one cycle. After draining the liquid, repeat steps 1.1 and 1.2 to replenish the original liquid, and then continue with steps 2.2, 2.3, and 2.4.

[0061] In this invention, the middle sections of evaporation towers T1, T2, T3, and T4 are all filled with packing layers. Their function is to increase the surface area of ​​the liquid flowing down from the top of the tower when it encounters the packing. Air enters from the bottom and exits from the top of the tower. The liquid in evaporation towers T1 and T2 is at a higher temperature than the circulating air, causing the original liquid to evaporate rapidly. The circulating air carries away the evaporated original liquid. The liquid in condensation towers T3 and T4 is at a lower temperature than the circulating air, causing the water vapor and other substances carried by the circulating air to condense rapidly and be collected in condensation towers T3 and T4.

[0062] Of course, the above embodiments are only for illustrating the technical concept and features of this utility model, and their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the protection scope of this utility model. All modifications made in accordance with the spirit and essence of the main technical solution of this utility model should be covered within the protection scope of this utility model.

Claims

1. A low-temperature evaporation system with mechanical seal cooling, characterized in that: It includes raw water tank G, evaporator T1, evaporator T2, condenser T3, condenser T4, heat exchanger R1, heat exchanger R2-1, heat exchanger R2-2, heat exchanger R3, mechanical seal circulation tank F, and concentrated liquid tank N; The raw water tank G is connected to the evaporation tower T1 and the evaporation tower T2 respectively via the raw liquid pump P1, and the condensation tower T3 and the condensation tower T4 are respectively connected to pipes for introducing tap water. Evaporation tower T1 is connected to the raw liquid inlets of heat exchangers R1, R2-1, and R2-2 via a tower-one circulation pump P2. The raw liquid outlet of heat exchanger R1 is connected to the raw liquid inlets of heat exchangers R2-1 and R2-2. The raw liquid outlets of heat exchangers R2-1 and R2-2 are connected to evaporation tower T2. Evaporation tower T2 is also connected to evaporation tower T1 via a tower-two circulation pump P3. Condensation tower T3 is connected to the tap water inlet of heat exchanger R1 via a tower-three circulation pump P4. The tap water outlet of heat exchanger R1 is connected to the tap water inlet of heat exchanger R3. The tap water outlet of heat exchanger R3 is connected to condensation tower T4. Condensation tower T4 is also connected to condensation tower T3 via a tower-four circulation pump P5. The evaporator T1 is connected to a pipe for air intake, and the evaporator T1, evaporator T2, condenser T3, and condenser T4 are connected in sequence. The condenser T4 is also connected to a pipe for air outlet. The bottom of the evaporator T1 is connected to a T1 concentrated discharge circulation pipe, and a concentrated discharge circulation pump P7-1 is installed on the T1 concentrated discharge circulation pipe. The bottom of the evaporator T2 is connected to a T2 concentrated discharge circulation pipe, and a concentrated discharge circulation pump P7-2 is installed on the T2 concentrated discharge circulation pipe. The T1 concentrated discharge circulation pipe and the T2 concentrated discharge circulation pipe are also respectively connected to the concentrated liquid tank N. The raw liquid pump P1, tower one circulation pump P2, tower two circulation pump P3, tower three circulation pump P4, tower four circulation pump P5, concentrate discharge circulation pump P7-1, and concentrate discharge circulation pump P7-2 are respectively connected to the mechanical seal circulation tank F for cooling.

2. The low-temperature evaporation system with mechanical seal cooling according to claim 1, characterized in that: The raw liquid pump P1 is connected to pipe CWW-0101. Pipe CWW-0101 is connected to the bottom of evaporator T1 via pipe CWW-0102 and manual butterfly valve DF02. Pipe CWW-0101 is connected to the bottom of evaporator T2 via manual butterfly valve DF03 and pipe CWW-0103. The top of condenser T3 is connected to pipe LW-0104 for introducing tap water. The top of condenser T4 is connected to pipe LW-0105 for introducing tap water.

3. The low-temperature evaporation system with mechanical seal cooling according to claim 1, characterized in that: The circulating pump P2 is connected to the bottom of the evaporation tower T1. The circulating pump P2 is also connected to pipe CWW-0204 via pipe CWW-0202 and manual butterfly valve DF05. Pipe CWW-0202 is connected to the raw liquid inlet of heat exchanger R1 via manual butterfly valve DF06. Pipe CWW-0204 is connected to the raw liquid inlet of heat exchanger R2-1 via manual butterfly valve DF08. Pipe CWW-0204 is connected to the raw liquid inlet of heat exchanger R2-2 via manual butterfly valve DF09. The heat exchanger... The raw liquid outlet of R1 is connected to the CWW-0204 via manual butterfly valve DF07 and pipe CWW-0203. The raw liquid outlet of heat exchanger R2-1 is connected to the top of evaporation tower T2 via manual butterfly valve DF10, pipe CWW-0205, and pipe CWW-0207. The raw liquid outlet of heat exchanger R2-2 is connected to the CWW-0207 via manual butterfly valve DF11 and pipe CWW-0206. The second-stage circulation pump P3 is connected between the bottom of evaporation tower T2 and the top of evaporation tower T1.

4. The low-temperature evaporation system with mechanical seal cooling according to claim 1, characterized in that: The third-stage circulation pump P4 is connected between the bottom of the condensing tower T3 and the tap water inlet of the heat exchanger R1. The tap water outlet of the heat exchanger R1 is connected to the tap water inlet of the heat exchanger R3, and the tap water outlet of the heat exchanger R3 is connected to the top of the condensing tower T4. The fourth-stage circulation pump P5 is connected between the bottom of the condensing tower T4 and the top of the condensing tower T3.

5. A low-temperature evaporation system with mechanical seal cooling according to claim 1, characterized in that: The steam inlets of heat exchangers R2-1 and R2-2 are connected to the steam inlet pipes via shut-off valves JZF01 and JZF02, respectively. The steam outlets of heat exchangers R2-1 and R2-2 are connected to the steam outlet pipes via shut-off valves JZF03 and JZF04, respectively. The cooling water inlet of heat exchanger R3 is connected to the cooling water inlet pipe via a manual butterfly valve DF19, and the cooling water outlet of heat exchanger R3 is connected to the cooling water outlet pipe via a manual butterfly valve DF20.

6. A low-temperature evaporation system with mechanical seal cooling according to claim 1, characterized in that: The bottom of the evaporator T1 is connected to a pipe GS-0102 for air intake. The top of the evaporator T1 is connected to the bottom of the evaporator T2 via pipe GS-0103. The top of the evaporator T2 is connected to the bottom of the condenser T3 via pipe GS-0104. The top of the condenser T3 is connected to the bottom of the condenser T4 via pipe GS-0105. The top of the condenser T4 is connected to a pipe GS-0106 for air outlet.

7. A low-temperature evaporation system with mechanical seal cooling according to claim 1, characterized in that: The T1 condensate discharge circulation pipeline includes a manual butterfly valve DF21 connected to one side of the bottom of the evaporator T1. The manual butterfly valve DF21 is connected to the condensate discharge circulation pump P7-1 via pipeline CNW-0101 and flexible joint RJ13. The condensate discharge circulation pump P7-1 is also connected to the other side of the bottom of the evaporator T1 via flexible joint RJ15, check valve ZH07, pneumatic butterfly valve QD01, pipeline CNW-0102, and manual butterfly valve DF23. The T2 condensate discharge circulation pipeline includes a manual butterfly valve DF24 connected to one side of the bottom of the evaporator T2. The manual butterfly valve DF24 is connected to the condensate discharge circulation pump P7-2 via pipeline CNW-0201 and flexible joint RJ14. The condensate discharge circulation pump P7-2 is also connected to the other side of the bottom of the evaporator T2 via flexible joint RJ16, check valve ZH08, pneumatic butterfly valve QD04, pipeline CNW-0202, and manual butterfly valve DF26.

8. A low-temperature evaporation system with mechanical seal cooling according to claim 7, characterized in that: A manual butterfly valve DF22 is connected to the pipeline between the check valve ZH07 and the pneumatic butterfly valve QD01. The manual butterfly valve DF22 is connected to the concentrate tank N via the pneumatic butterfly valve QD02 and the pipeline CNW-0103. A manual butterfly valve DF25 is connected to the pipeline between the check valve ZH08 and the pneumatic butterfly valve QD04. The manual butterfly valve DF25 is connected to the pipeline CNW-0103 via the pneumatic butterfly valve QD03.

9. A low-temperature evaporation system with mechanical seal cooling according to claim 1, characterized in that: The outlet of the mechanical seal circulation tank F is connected to pipe CWR-01 via circulation pump P8 and ball valve QF15. The return outlet of the mechanical seal circulation tank F is connected to pipe CWS-01 via ball valve QF14. The fourth tower circulation pump P5 is connected to pipe CWR-01 and pipe CWS-01 via ball valves QF28 and QF29, respectively. The third tower circulation pump P4 is connected to pipe CWR-01 and pipe CWS-01 via ball valves QF26 and QF27, respectively. The second tower circulation pump P3 is connected to pipe CWR-01 and pipe CWS-01 via ball valves QF24 and QF25, respectively. The CWS-01 connection is established. The first circulation pump P2 is connected to the CWR-01 and the CWS-01 pipeline via ball valves QF22 and QF23, respectively. The raw liquid pump P1 is connected to the CWR-01 and the CWS-01 pipeline via ball valves QF20 and QF21, respectively. The concentrate discharge circulation pump P7-1 is connected to the CWR-01 and the CWS-01 pipeline via ball valves QF17 and QF16, respectively. The concentrate discharge circulation pump P7-2 is connected to the CWR-01 and the CWS-01 pipeline via ball valves QF18 and QF19, respectively.

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