Low temperature evaporation condensation system

Abstract

The utility model discloses a low temperature evaporation condensing system, and the raw water tank G is connected evaporation tower T1 and T2, and the tap water inlet pipe LW-0101 is connected condensing tower T3 and T4, evaporation tower T1 is connected with heat exchanger R1, R2-1, R2-2, and heat exchanger R1 is connected with heat exchanger R2-1 and R2-2 still, and heat exchanger R2-1 and R2-2 are connected with evaporation tower T2 still, and evaporation tower T2 is connected with evaporation tower T1 still, and condensing tower T3, heat exchanger R1, heat exchanger R3, condensing tower T4 are connected in proper order, and condensing tower T4 is connected with condensing tower T3 still, and fresh fan F1, evaporation tower T1, evaporation tower T2, condensing tower T3, condensing tower T4, exhaust fan F3 are connected in proper order, and circulating fan F2 is set between condensing tower T4 and evaporation tower T1. The utility model discloses adopt two evaporation towers to circulate evaporation high salt liquid, and the system operation can be flexibly adjusted according to actual demand, and can greatly improve the processing effect.

Description

Technical Field

[0001] This utility model relates to the field of evaporation and condensation technology, and in particular to a low-temperature evaporation and condensation system. 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 then condensing it back into liquid. This process allows for the recovery of necessary substances from the waste liquid for recycling while also meeting wastewater discharge requirements. However, current evaporation-condensation systems rely on a single heating and condensation process, lacking flexibility to adapt to specific needs. Consequently, the treatment effectiveness is unsatisfactory and fails to meet actual production requirements. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a low-temperature evaporation and condensation system, which aims to solve the technical problems of existing technologies where the heating and condensation processes are simple, cannot be flexibly adjusted, and affect the treatment effect.

[0004] The technical solution of this utility model is: a low-temperature evaporation and condensation system, including a raw water tank G, a tap water inlet pipe LW-0101, evaporation towers T1, T2, T3, T4, heat exchangers R1, R2-1, R2-2, R3, a fresh air fan F1, a circulating fan F2, and an exhaust fan F3. The raw water tank G is connected to evaporation towers T1 and T2, and the tap water inlet pipe LW-0101 is connected to condensation towers T3 and T4. The bottom of evaporation tower T1 is connected to the raw liquid inlet of heat exchangers R1, R2-1, and R2-2, and the raw liquid outlet of heat exchanger R1 is connected to the raw liquid inlet of heat exchangers R2-1 and R2-2. The raw liquid outlet of heat exchanger R2-2 is connected to the top of evaporator T2, and the bottom of evaporator T2 is connected to the top of evaporator T1 for circulating evaporation. The bottom of condenser T3 is connected to 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, the tap water outlet of heat exchanger R3 is connected to the top of condenser T4, and the bottom of condenser T4 is connected to the top of condenser T3. Fresh air fan F1, evaporator T1, evaporator T2, condenser T3, condenser T4, and exhaust fan F3 are connected in sequence. The air inlet of circulating fan F2 is connected between condenser T4 and exhaust fan F3, and the air outlet of circulating fan F2 is connected between fresh air fan F1 and evaporator T1.

[0005] Furthermore, in this utility model, the raw water tank G is connected to a pipe CWW-0101 via a manual butterfly valve DF01, a flexible connector RJ01, a raw liquid pump P1, a flexible connector RJ02, and a check valve ZH01. The pipe CWW-0101 is connected to the bottom of the evaporation tower T1 via a pipe CWW-0102 and a manual butterfly valve DF02. The pipe CWW-0101 is connected to the bottom of the evaporation tower T2 via a manual butterfly valve DF03 and a pipe CWW-0103.

[0006] Furthermore, in this utility model, the tap water inlet pipe LW-0101 is connected to the top of the condensing tower T3 via ball valve QF03 and pipe LW-0104, and the tap water inlet pipe LW-0101 is connected to the top of the condensing tower T4 via ball valve QF04 and pipe LW-0105.

[0007] Furthermore, in this utility model, the bottom of the evaporator T1 is connected to pipe CWW-0204 via manual butterfly valve DF04, pipe CWW-0201, flexible joint RJ03, tower-one circulation pump P2, flexible joint RJ04, check valve ZH02, 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... The outlet of heat exchanger R2-1 is connected to the top of evaporator T2 via manual butterfly valve DF07, pipe CWW-0203, and pipe CWW-0204. The outlet of the raw liquid 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 outlet of the raw liquid of heat exchanger R2-2 is connected to the top of evaporator T1 via manual butterfly valve DF11, pipe CWW-0206, and pipe CWW-0207. The bottom of evaporator T2 is connected to the top of evaporator T1 via manual butterfly valve DF12, pipe CWW-0301, flexible joint RJ06, tower two circulation pump P3, flexible joint RJ05, check valve ZH03, and pipe CWW-0302.

[0008] Furthermore, in this utility model, the bottom of the condensing tower T3 is connected to the tap water inlet of the heat exchanger R1 via a manual butterfly valve DF13, pipe CWW-0401, flexible joint RJ08, tower three circulation pump P4, flexible joint RJ07, check valve ZH04, and manual butterfly valve DF14. The tap water outlet of the heat exchanger R1 is connected to the tap water inlet of the heat exchanger R3 via a manual butterfly valve DF15, pipe CWW-0402, and manual butterfly valve DF16. The tap water outlet of the heat exchanger R3 is connected to the top of the condensing tower T4 via a manual butterfly valve DF17 and pipe CWW-0406. The bottom of the condensing tower T4 is connected to the top of the condensing tower T3 via a manual butterfly valve DF28, pipe CWW-0501, flexible joint RJ10, tower four circulation pump P5, flexible joint RJ09, check valve ZH05, pipe CWW-0502, and manual butterfly valve DF18.

[0009] Furthermore, in this utility model, the steam inlets of heat exchangers R2-1 and R2-2 are respectively connected to pneumatic proportional regulating valve QDT01 via shut-off valves JZF01 and JZF02. The pneumatic proportional regulating valve QDT01 is connected to a steam inlet pipe. The steam outlet of heat exchanger R2-1 is connected to a steam outlet pipe via a steam trap SSQ01 and shut-off valve JZF03. The steam outlet of heat exchanger R2-2 is connected to a steam outlet pipe via a steam trap SSQ02 and shut-off valve JZF04.

[0010] Furthermore, in this utility model, the cooling water inlet of the heat exchanger R3 is connected to a cooling water inlet pipe via a manual butterfly valve DF19, and the cooling water outlet of the heat exchanger R3 is connected to a cooling water outlet pipe via a manual butterfly valve DF20.

[0011] Furthermore, in this utility model, the fresh air fan F1 is connected to the bottom of the evaporation tower T1 via pipe GS-0201, pneumatic butterfly valve QD05, and pipe GS-0102. The top of the evaporation tower T1 is connected to the bottom of the evaporation tower T2 via pipe GS-0103. The top of the evaporation tower T2 is connected to the bottom of the condensation tower T3 via pipe GS-0104. The top of the condensation tower T3 is connected to the bottom of the condensation tower T4 via pipe GS-0105. The top of the condensation tower T4 is connected to the exhaust fan F3 via pipe GS-0106 and pneumatic butterfly valve QD06. The air inlet of the circulating fan F2 is connected to pipe GS-0106 via pipe GS-0107, and the air outlet of the circulating fan F2 is connected to pipe GS-0102 via pipe GS-0101.

[0012] Furthermore, the pipeline GS-0107 described in this utility model is equipped with a remote pressure gauge PI002.

[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 mainly includes two stages: the first stage is the rapid heating stage of evaporation towers T1, T2, T3, and T4; the second stage is the stable evaporation stage of evaporation towers T1 and T2, and the stable condensation stage of condensation towers T3 and T4. The system operation can be flexibly adjusted according to actual needs. The middle of each of the four towers is a packing layer. Its function is to expand the surface area of ​​the liquid flowing down from the top of the tower when it encounters the packing. The air enters from the bottom of the tower and exits from the top. The liquid in evaporation towers T1 and T2 is at a higher temperature than the circulating air, which causes the raw liquid to evaporate rapidly. The circulating air carries away the evaporated raw liquid. The liquid in condensation towers T3 and T4 is at a lower temperature than the circulating air. The water vapor and other substances carried by the circulating air are quickly condensed and collected in condensation towers T3 and T4. Compared with traditional treatment systems, this can greatly improve the treatment effect. 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 and condensation system according to this invention. Figure 1 It mainly includes raw water tank G, tap water inlet pipe LW-0101, evaporator T1, evaporator T2, condenser T3, condenser T4, heat exchanger R1, heat exchanger R2-1, heat exchanger R2-2, heat exchanger R3, fresh air fan F1, circulating fan F2, and exhaust fan F3.

[0017] Raw water tank G is connected to both evaporation towers T1 and T2, allowing wastewater to be treated to be introduced into each tower. Raw water tank G is connected to pipe CWW-0101 via manual butterfly valve DF01, flexible connector RJ01, raw liquid pump P1, flexible connector RJ02, and check valve ZH01. Pipe CWW-0101 is connected to the bottom of evaporation tower T1 via pipe CWW-0102 and manual butterfly valve DF02. Pipe CWW-0101 is connected to the bottom of evaporation tower T2 via manual butterfly valve DF03 and pipe CWW-0103.

[0018] The tap water inlet pipe LW-0101 is connected to both condenser towers T3 and T4, allowing tap water to flow into each tower. Specifically, the tap water inlet pipe LW-0101 is connected to the top of condenser tower T3 via ball valve QF03 and pipe LW-0104, and to the top of condenser tower T4 via ball valve QF04 and pipe LW-0105.

[0019] The bottom of evaporator T1 is connected to the raw liquid inlet of heat exchangers R1, R2-1, and R2-2, respectively. Specifically, the bottom of evaporator T1 is connected to pipe CWW-0204 via manual butterfly valve DF04, pipe CWW-0201, flexible joint RJ03, tower-one circulation pump P2, flexible joint RJ04, check valve ZH02, 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, and 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] The bottom of evaporator T2 is connected to the top of evaporator T1 via manual butterfly valve DF12, pipe CWW-0301, flexible joint RJ06, tower two circulation pump P3, flexible joint RJ05, check valve ZH03, and pipe CWW-0302 for circulating evaporation.

[0022] The bottom of condenser tower T3 is connected to the tap water inlet of heat exchanger R1 via manual butterfly valve DF13, pipe CWW-0401, flexible joint RJ08, tower three circulation pump P4, flexible joint RJ07, check valve ZH04, and manual butterfly valve DF14. The tap water outlet of heat exchanger R1 is connected to the tap water inlet of heat exchanger R3 via manual butterfly valve DF15, pipe CWW-0402, and manual butterfly valve DF16. The tap water outlet of heat exchanger R3 is connected to the top of condenser tower T4 via manual butterfly valve DF17 and pipe CWW-0406.

[0023] The bottom of condensing tower T4 is connected to the top of condensing tower T3 via manual butterfly valve DF28, pipe CWW-0501, flexible joint RJ10, tower four circulation pump P5, flexible joint RJ09, check valve ZH05, pipe CWW-0502, and manual butterfly valve DF18.

[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 pneumatic proportional control valve QDT01 via shut-off valves JZF01 and JZF02, respectively. Pneumatic proportional control valve QDT01 is connected to a steam inlet pipe. The steam outlet of heat exchanger R2-1 is connected to the steam outlet pipe via steam trap SSQ01 and shut-off valve JZF03, and the steam outlet of heat exchanger R2-2 is connected to the steam outlet pipe via steam trap SSQ02 and shut-off valve JZF04.

[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] Fresh air fan F1, evaporator T1, evaporator T2, condenser T3, condenser T4, and exhaust fan F3 are connected in sequence. Specifically, fresh air fan F1 is connected to the bottom of evaporator T1 via pipe GS-0201, pneumatic butterfly valve QD05, and pipe GS-0102. The top of evaporator T1 is connected to the bottom of evaporator T2 via pipe GS-0103. The top of evaporator T2 is connected to the bottom of condenser T3 via pipe GS-0104. The top of condenser T3 is connected to the bottom of condenser T4 via pipe GS-0105. The top of condenser T4 is connected to exhaust fan F3 via pipe GS-0106 and pneumatic butterfly valve QD06.

[0027] The air inlet of circulating fan F2 is connected between condenser tower T4 and exhaust fan F3. Specifically, the air inlet of circulating fan F2 is connected to pipe GS-0106 via pipe GS-0107. The air outlet of circulating fan F2 is connected between fresh air fan F1 and evaporator tower T1. Specifically, the air outlet of circulating fan F2 is connected to pipe GS-0102 via pipe GS-0101. Pipe GS-0107 is also equipped with a remote pressure gauge PI002.

[0028] 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, manual butterfly valve DF01, flexible connector RJ01, raw liquid pump P1, flexible connector RJ02, check valve ZH01, pipeline CWW-0101, pipeline CWW-0102, and manual butterfly valve DF02. Manual butterfly valve DF03 is closed throughout the entire process.

[0029] 1.2 Add raw liquid to the evaporator T2 at the appropriate level through the raw water tank G, manual butterfly valve DF01, flexible connector RJ01, raw liquid pump P1, flexible connector RJ02, check valve ZH01, pipeline CWW-0101, manual butterfly valve DF03, and pipeline CWW-0103. Manual butterfly valve DF02 is closed throughout the entire process.

[0030] 1.3 Add tap water to the condenser T3 at an appropriate level through pipe LW-0101, ball valve QF03, and pipe LW-0104.

[0031] 1.4 Add tap water to the condenser T4 at an appropriate level through pipe LW-0101, ball valve QF04, and pipe LW-0105.

[0032] 1.5 When the pneumatic butterfly valves QD05 and QD06 of the air duct system are opened, the fresh air fan F1, circulating fan F2, and exhaust fan F3 are started. Fresh air is discharged through fresh air fan F1, pipe GS-0201, pipe GS-0102, evaporator T1, pipe GS-0103, evaporator T2, pipe GS-0104, condenser T3, pipe GS-0105, condenser T4, pipe GS-0106, and exhaust fan F3. After a certain period of time, all are shut off.

[0033] II. Equipment Start-up 2.1 Rapid temperature rise stage during start-up of evaporator T1, evaporator T2, condenser T3, and condenser T4 2.1.1 The raw liquid inside evaporator T1 flows from the bottom of evaporator T1 to the top of evaporator T2 via manual butterfly valve DF04, pipe CWW-0201, flexible joint RJ03, circulating pump P2, flexible joint RJ04, check valve ZH02, 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.

[0034] 2.1.2 The raw liquid inside evaporator T2 flows from the bottom of evaporator T2 to the top of evaporator T1 through manual butterfly valve DF12, pipe CWW-0301, flexible joint RJ06, tower two circulation pump P3, flexible joint RJ05, check valve ZH03, and pipe CWW-0302.

[0035] 2.1.3 The tap water inside condenser T3 flows from the bottom of condenser T3 through manual butterfly valve DF13, pipe CWW-0401, flexible joint RJ08, tower circulation pump P4, flexible joint RJ07, check valve ZH04, manual butterfly valve DF14, heat exchanger R1 (S3 inlet, S4 outlet), manual butterfly valve DF15, pipe CWW-0402, manual butterfly valve DF16, heat exchanger R3 (S4 inlet, S3 outlet), manual butterfly valve DF17, and pipe CWW-0406 to the top of condenser T4. At this time, manual butterfly valves DF19 and DF20 are closed.

[0036] 2.1.4 The tap water inside the condenser T4 flows from the bottom of the condenser T4 through the manual butterfly valve DF28, pipe CWW-0501, flexible joint RJ10, tower four circulation pump P5, flexible joint RJ09, check valve ZH05, pipe CWW-0502, and manual butterfly valve DF18 to the top of the condenser T3.

[0037] 2.1.5 Steam in the steam pipeline is discharged into the sewer through pneumatic proportional regulating valve QDT01, shut-off valve JZF01, heat exchanger R2-1 (S3 inlet and S4 outlet of heat exchanger R2-1), steam trap SSQ01, and shut-off valve JZF03. At this time, shut-off valves JZF02 and JZF04 are in the closed state.

[0038] 2.1.6 The manual butterfly valves DF19 and DF20 of the cooling water pipeline are closed.

[0039] 2.1.7 Open the pneumatic butterfly valves QD05 and QD06 in the air duct system, then start the fresh air fan F1, circulating fan F2, and exhaust fan F3. Fresh air is discharged into the RTO through fresh air fan F1, pipe GS-0201, pipe GS-0102, evaporator T1, pipe GS-0103, evaporator T2, pipe GS-0104, condenser T3, pipe GS-0105, condenser T4, pipe GS-0106, and exhaust fan F3. After a certain period of time, close the fresh air fan F1, exhaust fan F3, pneumatic butterfly valves QD05 and QD06. At this time, under the action of the circulating fan F2, the air in the system circulates sequentially through pipes GS-0101, GS-0102, evaporator T1, GS-0103, evaporator T2, GS-0104, condenser T3, GS-0105, condenser T4, GS-0106, and GS-0107. As the raw liquid in evaporators T1 and T2 evaporates, the internal pressure of the system gradually increases (which can be obtained through the remote pressure gauge PI002 on pipe GS-0107). When it reaches the set value, the system will start... Turn on exhaust fan F3 and pneumatic butterfly valve QD06 to gradually expel internal air. When the internal pressure of the system gradually decreases to the set value, turn off exhaust fan F3 and pneumatic butterfly valve QD06. Then turn on fresh air fan F1 and pneumatic butterfly valve QD05 to continuously introduce fresh air into the system. When the internal pressure of the system gradually increases to the set value, turn off fresh air fan F1 and pneumatic butterfly valve QD05. As the raw liquid in evaporation towers T1 and T2 evaporates, when the internal pressure of the system gradually increases to the set value, turn on exhaust fan F3 and pneumatic butterfly valve QD06 to enter the next cycle.

[0040] 2.1.8 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 of appropriate 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.

[0041] 2.2 Stable evaporation stages in evaporator T1 and T2, and stable condensation stages in condenser T3 and T4. 2.2.1 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.

[0042] 2.2.2 The flow from evaporator T2 to evaporator T1 is the same as in 2.1.2. 2.2.3 The flow from condenser T3 to condenser T4 is the same as in 2.1.3. 2.2.4 The flow from condenser T4 to condenser T3 is the same as in 2.1.4. 2.2.5 Steam piping is the same as 2.1.5 2.2.6 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).

[0043] 2.2.7 The ventilation system is the same as 2.1.7. Evaporation towers T1, T2, T3, and T4 all have a packing layer in the middle. Its function is to increase the surface area of ​​the liquid flowing down from the top of the tower when it encounters the packing. The 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 raw liquid to evaporate rapidly. The circulating air carries away the evaporated raw liquid. The liquid in condensation towers T3 and T4 is at a lower temperature than the circulating air, and the water vapor and other substances carried by the circulating air are quickly condensed and collected in condensation towers T3 and T4.

[0044] 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 and condensation system, characterized in that: The system includes a raw water tank G, a tap water inlet pipe LW-0101, evaporators T1 and T2, condensers T3 and T4, heat exchangers R1, R2-1, R2-2, and R3, a fresh air fan F1, a circulating fan F2, and an exhaust fan F3. The raw water tank G is connected to both evaporators T1 and T2. The tap water inlet pipe LW-0101 is connected to both condensers T3 and T4. The bottom of evaporator T1 is connected to the raw liquid inlets of heat exchangers R1, R2-1, and R2-2. 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... The top of the evaporator T2 is connected to the top of the evaporator T1 for circulating evaporation; the bottom of the condenser T3 is connected to 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, the tap water outlet of the heat exchanger R3 is connected to the top of the condenser T4, and the bottom of the condenser T4 is connected to the top of the condenser T3; the fresh air fan F1, evaporator T1, evaporator T2, condenser T3, condenser T4, and exhaust fan F3 are connected in sequence; the air inlet of the circulating fan F2 is connected between the condenser T4 and the exhaust fan F3, and the air outlet of the circulating fan F2 is connected between the fresh air fan F1 and the evaporator T1.

2. The low-temperature evaporation and condensation system according to claim 1, characterized in that: The raw water tank G is connected to pipe CWW-0101 via manual butterfly valve DF01, flexible connector RJ01, raw liquid pump P1, flexible connector RJ02, and check valve ZH01. Pipe CWW-0101 is connected to the bottom of evaporation tower T1 via pipe CWW-0102 and manual butterfly valve DF02. Pipe CWW-0101 is connected to the bottom of evaporation tower T2 via manual butterfly valve DF03 and pipe CWW-0103.

3. The low-temperature evaporation and condensation system according to claim 1, characterized in that: The tap water inlet pipe LW-0101 is connected to the top of the condensing tower T3 via ball valve QF03 and pipe LW-0104, and the tap water inlet pipe LW-0101 is connected to the top of the condensing tower T4 via ball valve QF04 and pipe LW-0105.

4. The low-temperature evaporation and condensation system according to claim 1, characterized in that: The bottom of the evaporator T1 is connected to pipe CWW-0204 via manual butterfly valve DF04, pipe CWW-0201, flexible joint RJ03, tower-one circulation pump P2, flexible joint RJ04, check valve ZH02, 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 via manual... Butterfly valve DF07 and pipe CWW-0203 are connected to pipe CWW-0204. The raw liquid outlet of heat exchanger R2-1 is connected to the top of evaporation tower T2 through 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 through manual butterfly valve DF11, pipe CWW-0206, and pipe CWW-0207. The bottom of evaporation tower T2 is connected to the top of evaporation tower T1 through manual butterfly valve DF12, pipe CWW-0301, flexible joint RJ06, tower two circulation pump P3, flexible joint RJ05, check valve ZH03, and pipe CWW-0302.

5. A low-temperature evaporation and condensation system according to claim 1, characterized in that: The bottom of the condensing tower T3 is connected to the tap water inlet of the heat exchanger R1 via manual butterfly valve DF13, pipe CWW-0401, flexible joint RJ08, tower three circulation pump P4, flexible joint RJ07, check valve ZH04, and manual butterfly valve DF14. The tap water outlet of the heat exchanger R1 is connected to the tap water inlet of the heat exchanger R3 via manual butterfly valve DF15, pipe CWW-0402, and manual butterfly valve DF16. The tap water outlet of the heat exchanger R3 is connected to the top of the condensing tower T4 via manual butterfly valve DF17 and pipe CWW-0406. The bottom of the condensing tower T4 is connected to the top of the condensing tower T3 via manual butterfly valve DF28, pipe CWW-0501, flexible joint RJ10, tower four circulation pump P5, flexible joint RJ09, check valve ZH05, pipe CWW-0502, and manual butterfly valve DF18.

6. A low-temperature evaporation and condensation system according to claim 1, characterized in that: The steam inlets of heat exchangers R2-1 and R2-2 are connected to pneumatic proportional control valve QDT01 via shut-off valves JZF01 and JZF02, respectively. The pneumatic proportional control valve QDT01 is connected to a steam inlet pipe. The steam outlet of heat exchanger R2-1 is connected to a steam outlet pipe via a steam trap SSQ01 and shut-off valve JZF03. The steam outlet of heat exchanger R2-2 is connected to a steam outlet pipe via a steam trap SSQ02 and shut-off valve JZF04.

7. The low-temperature evaporation and condensation system according to claim 1, characterized in that: The cooling water inlet of the heat exchanger R3 is connected to a cooling water inlet pipe via a manual butterfly valve DF19, and the cooling water outlet of the heat exchanger R3 is connected to a cooling water outlet pipe via a manual butterfly valve DF20.

8. A low-temperature evaporation and condensation system according to claim 1, characterized in that: The fresh air fan F1 is connected to the bottom of the evaporator tower T1 via pipe GS-0201, pneumatic butterfly valve QD05, and pipe GS-0102. The top of the evaporator tower T1 is connected to the bottom of the evaporator tower T2 via pipe GS-0103. The top of the evaporator tower T2 is connected to the bottom of the condenser tower T3 via pipe GS-0104. The top of the condenser tower T3 is connected to the bottom of the condenser tower T4 via pipe GS-0105. The top of the condenser tower T4 is connected to the exhaust fan F3 via pipe GS-0106 and pneumatic butterfly valve QD06. The air inlet of the circulating fan F2 is connected to pipe GS-0106 via pipe GS-0107, and the air outlet of the circulating fan F2 is connected to pipe GS-0102 via pipe GS-0101.

9. A low-temperature evaporation and condensation system according to claim 8, characterized in that: The pipeline GS-0107 is equipped with a remote pressure gauge PI002.

Images