Modular distilled water machine and distilled water preparation method
By using a multi-stage preheating heat exchanger assembly and atomizing nozzle design in a modular water distillation machine, the problems of limited capacity adjustment, low energy efficiency, and difficulty in controlling steam purity in traditional water distillation machines are solved, achieving flexible capacity adjustment, efficient energy utilization, and guaranteed distilled water purity.
Patent Information
- Application Number
- CN202511578549.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-31
- Publication Date
- 2025-12-16
AI Technical Summary
Traditional water distillation machines suffer from problems such as limited capacity adjustment, low energy efficiency, poor equipment stability, and difficulty in controlling steam purity.
It adopts a modular design, using multiple evaporators and compressors connected in parallel, combined with multi-stage preheating heat exchanger groups and atomizing nozzles to achieve capacity regulation, waste heat recovery and non-condensable gas removal.
It enables flexible adjustment of production capacity, improves energy efficiency, ensures the purity of distilled water and the stability of equipment, and reduces operating costs.
Smart Images
Figure CN121134878A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of distilled water preparation, in particular to a modular distilled water machine and a method for preparing distilled water. BACKGROUND
[0002] As high-purity water, distilled water is indispensable in the preparation of pharmaceutical injection water, the sterile production of food processing, the cleaning of electronic components, and other scenarios. Traditional distilled water machines mostly adopt the structure of a single large evaporator combined with a single compressor, which has the following significant problems: Limited capacity adjustment: The evaporation capacity of a single evaporator is fixed. If the water production needs to be adjusted, the entire equipment needs to be started or stopped, or the operating parameters need to be changed, which is difficult to adapt to water demand at different times, and is prone to energy waste or insufficient capacity; Low energy utilization efficiency: During the heating of raw water, external high-grade energy such as industrial steam is relied on, resulting in high operating costs; Poor equipment stability: When a single compressor or a single evaporator fails, the entire set of equipment needs to be shut down for maintenance, affecting continuous production; Steam purity control difficulty: The dissolved non-condensable gases (such as oxygen and carbon dioxide) in the raw water are not effectively removed, which easily enters the finished water with the steam, resulting in an increase in the electrical conductivity of the distilled water and affecting the purity. SUMMARY
[0003] The present application aims to provide a modular distilled water machine and a method for preparing distilled water, which can solve the above technical problems.
[0004] In a first aspect, the present application provides a modular distilled water machine, comprising a raw water inlet, a preheating heat exchanger group, a heater, a compressor, and multiple parallelly arranged evaporators; The raw water inlet is in communication with the inlet of the preheating heat exchanger group, the outlet of the preheating heat exchanger group is in communication with the inlet of the heater, an atomizing nozzle is arranged at the inlet of the heater, the liquid outlet of the heater is in communication with the inlets of the multiple parallelly arranged evaporators, and the non-condensable gas discharge port of the heater is connected with the preheating heat exchanger group. The evaporators are in communication with the compressor, the compressor is used for pressurizing the steam in the evaporators, and the distilled water outlets of the evaporators and the concentrated water outlet are both in communication with the preheating heat exchanger group.
[0005] In an optional embodiment, the preheating heat exchanger group comprises a first heat exchanger, a second heat exchanger, a third heat exchanger, a fourth heat exchanger, and a fifth heat exchanger; The tube passes of the first heat exchanger, the second heat exchanger, the third heat exchanger, the fourth heat exchanger, and the fifth heat exchanger are in communication in sequence; The shell passes of the first heat exchanger are in communication with the non-condensable gas discharge port of the heater and the outside environment, respectively.
[0006] In an alternative embodiment, the shell side of the second heat exchanger is connected to the concentrated water outlet of the evaporator for recovering heat from the evaporator.
[0007] In an alternative embodiment, the tube side of the third heat exchanger is connected to the tube side of the second heat exchanger and the tube side of the third heat exchanger respectively, the inlet of the shell side of the third heat exchanger is connected to the industrial steam outlet of the heater and the shell side of the fifth heat exchanger, and the outlet of the shell side of the third heat exchanger is connected to the industrial steam condensate outlet of the system.
[0008] In an alternative embodiment, the tube side of the fourth heat exchanger is connected to the tube side of the third heat exchanger and the tube side of the fifth heat exchanger respectively. The shell side of the fourth heat exchanger is connected to the distilled water outlet of the evaporator and the outside respectively.
[0009] In an alternative embodiment, the tube side of the fifth heat exchanger is connected to the tube side of the fourth heat exchanger and the atomizing nozzle of the heater respectively. The shell side of the fifth heat exchanger is connected to the shell side of the third heat exchanger and the industrial steam respectively.
[0010] In an alternative embodiment, the preheating heat exchanger group further comprises a regulating valve. The water inlet of the regulating valve is connected between the tube side of the third heat exchanger and the tube side of the fourth heat exchanger, and the water outlet of the regulating valve is connected to the tube side inlet of the fifth heat exchanger.
[0011] In an alternative embodiment, the distilled water outlet of the evaporator is connected to a water storage tank, and the outlet of the water storage tank is connected to the preheating heat exchanger group.
[0012] In an alternative embodiment, a water pump is arranged between the water storage tank and the preheating heat exchanger group.
[0013] In a second aspect, the present application provides a method for producing distilled water using the modular distilled water machine according to any one of the preceding embodiments, comprising the following steps: (1) raw water enters the multi-stage preheating heat exchanger group from the raw water inlet, and is transported to the heater after preheating treatment; (2) before entering the heater, the raw water is atomized by the atomizing nozzle at the inlet of the heater to remove non-condensable gas in the raw water; (3) the atomized raw water is heated to a near evaporation state in the heater, and then is transported to a plurality of parallelly arranged evaporators; (4) the raw water in the near evaporation state is evaporated in the evaporators to generate steam, and the steam is transported to the compressor for pressure and temperature increasing treatment, and the steam after pressure and temperature increasing treatment is transported to the shell side of the evaporator. (5) The steam after being pressurized and heated in the shell side of the evaporator exchanges heat with the near-evaporated raw water in the tube side of the evaporator. The steam condenses to form distilled water, and the near-evaporated raw water in the tube side further evaporates to produce steam, repeating the cycle of step (4). (6) The distilled water produced by the evaporator is collected and transported to the water for injection storage tank. The non-condensable gas discharged from the water for injection storage tank and the non-condensable gas discharged from the heater are transported together to the heat exchanger in the multi-stage preheating heat exchanger group to recover the heat of the non-condensable gas, and exchange heat with the raw water to recover the heat in the non-condensable gas.
[0014] The beneficial effects of this invention are: Modular design, flexible capacity adjustment: The modular structure with multiple evaporators connected in parallel allows for step-by-step capacity adjustment by starting and stopping some evaporators and corresponding compressors, adapting to water demand at different times and avoiding energy waste; when a single evaporator or compressor fails, the remaining modules can operate normally, ensuring continuous production and significantly improving stability. Multi-stage waste heat recovery, significant energy saving effect: The preheating heat exchanger group uses multi-stage heat exchange to recover system waste heat, and at the same time uses a composite heat source to achieve final preheating of raw water, which greatly reduces the dependence on external energy sources such as industrial steam, improves energy utilization efficiency, and significantly reduces operating costs. Removing non-condensable gases and ensuring the purity of distilled water: The atomizing nozzle at the heater inlet can atomize the raw water, promote the full release of non-condensable gases, and prevent non-condensable gases from entering the evaporator and affecting the purity of the steam; at the same time, no impurities are introduced during the waste heat recovery process, further ensuring the high purity of distilled water. Compact structure and strong adaptability: Each module (evaporator, heat exchanger) is independent and easy to connect. The number of evaporators can be increased or decreased according to actual production capacity requirements to adapt to different scale production scenarios. The overall structure of the equipment is compact, occupies a small area, and is easy to install and maintain. Attached Figure Description
[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 This is a schematic diagram of a modular water distillation machine provided in an embodiment of the present invention.
[0017] Icons: A: Raw water inlet; B: Distilled water outlet; C: Industrial steam inlet; D: Non-condensable gas outlet; E: Concentrate outlet; F: Industrial steam condensate outlet; H1: First heat exchanger; H2: Second heat exchanger; H3: Third heat exchanger; H4: Fourth heat exchanger; H5: Fifth heat exchanger; H6: Heater; T1: Control valve; B1: Atomizing nozzle; P1: First evaporator; P2: Second evaporator; P3: Third evaporator; P4: Fourth evaporator; Z1: First compressor; Z2: Second compressor; Z3: Third compressor; Z4: Fourth compressor. Detailed Implementation
[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0019] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.
[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0021] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0022] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0023] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0024] The following is combined Figure 1 The following describes some embodiments of the present invention in detail. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0025] In a first aspect, the present invention provides a modular distillation water machine, comprising a raw water inlet A, a preheating heat exchanger group, a heater H6, a compressor, and multiple evaporators connected in parallel; the raw water inlet A is connected to the inlet of the preheating heat exchanger group, the outlet of the preheating heat exchanger group is connected to the inlet of the heater H6, the inlet of the heater H6 is provided with an atomizing nozzle B1, the liquid outlet of the heater H6 is connected to the inlet of the multiple evaporators connected in parallel, and the non-condensable gas discharge port of the heater H6 is connected to the preheating heat exchanger group; the evaporator is connected to the compressor, the compressor is used to pressurize the steam in the evaporator, and the distilled water outlet and the concentrated water outlet of the evaporator are both connected to the preheating heat exchanger group.
[0026] In this embodiment, the raw water inlet A is directly connected to the inlet of the preheating heat exchanger group, forming the initial path for the raw water to enter the system; the outlet of the preheating heat exchanger group is connected to the inlet of the heater H6 through a pipeline, allowing the raw water that has been preheated multiple times to enter the heater H6; an atomizing nozzle B1 is fixedly installed at the inlet of the heater H6, and the nozzle B1 is integrated with the inlet pipe of the heater H6; the liquid outlet of the heater H6 is connected to the inlets of multiple parallel evaporators through a connecting pipeline, ensuring that the heated raw water can be distributed to each evaporator; the non-condensable gas outlet of the heater H6 is connected to a specific interface of the preheating heat exchanger group through a pipeline for heat recovery of non-condensable gas.
[0027] Specifically, in this embodiment, there are four evaporators: a first evaporator P1, a second evaporator P2, a third evaporator P3, and a fourth evaporator P4. Each evaporator corresponds to at least one compressor, that is, the first evaporator P1 corresponds to the first compressor Z1, the second evaporator P2 corresponds to the second compressor Z2, the third evaporator P3 corresponds to the third compressor Z3, and the fourth evaporator P4 corresponds to the fourth compressor Z4.
[0028] The operation of the evaporator, taking the first evaporator P1 as an example, is explained as follows: After being heated, the raw water enters the first evaporator P1 below it. The heating equipment inside the first evaporator P1 heats the incoming raw water, forming steam that rises to the upper cavity. The steam in the upper cavity is pressurized and heated by the first compressor Z1, and some of it enters the lower part of the first evaporator P1 to exchange heat with the raw water in the heating equipment. The steam condenses, and the heated raw water forms steam again, which is then pressurized and heated, thus forming a heat recycling process.
[0029] After the steam is condensed, part of the condensed distilled water flows through the distilled water outlet of the first evaporator P1 to the preheating heat exchanger group. After exchanging heat with the raw water, it is discharged through the system's distilled water drain outlet B, realizing the recovery and utilization of the heat of the distilled water. The other part flows through the concentrated water outlet of the first evaporator P1 to the preheating heat exchanger group. After exchanging heat with the raw water, it is discharged through the system's concentrated water drain outlet E, realizing the recovery and utilization of the heat of the concentrated water.
[0030] In this embodiment, the raw water inlet A is used to receive the raw water to be treated and provide raw materials for the system. The core function of the preheating heat exchanger group is to use the waste heat in the system, such as non-condensable gases, concentrated water, and distilled water, to preheat the raw water in order to reduce the energy consumption of subsequent heating stages. The heater H6 is used to heat the preheated raw water to a near-evaporation state, close to the boiling point but not completely evaporated. The atomizing nozzle B1 at its inlet can atomize the raw water, increase the contact area between the raw water and the air, and promote the rapid release of non-condensable gases such as oxygen and carbon dioxide dissolved in the raw water, thereby reducing the impact of non-condensable gases on the purity of subsequent steam.
[0031] Multiple evaporators connected in parallel are used to achieve efficient evaporation of raw water. The near-evaporation state of the raw water forms a rising film along the tube wall inside the evaporator. Due to the flow rate and heating effect, the raw water rises and evaporates in a thin film form on the tube wall, which can improve the evaporation efficiency. The compressor is used to pressurize and heat the steam generated by the evaporator, making the steam a higher-temperature heat source, which is reused in the heating process of the evaporator to form an energy cycle. The distilled water outlet of the evaporator is used to output pure distilled water, and the concentrated water outlet is used to discharge the unevaporated impurity concentrate. Both are connected to the preheating heat exchanger group, which can transfer the waste heat they carry to the raw water to achieve energy recovery.
[0032] In operation, raw water enters the preheating heat exchanger group through raw water inlet A, where it absorbs waste heat and its temperature rises. It then enters the heater H6 inlet, where it is atomized by atomizing nozzle B1. The released non-condensable gas enters the preheating heat exchanger group through the non-condensable gas outlet of heater H6. The atomized raw water is heated to a near-evaporation state in heater H6 and distributed to multiple parallel evaporators through the liquid outlet. The raw water evaporates in the evaporators to produce steam, which is then pressurized and heated by the compressor before being transported to the shell side of the evaporator. The high-temperature steam in the shell side exchanges heat with the raw water in the tube side, condenses into distilled water, and is discharged from the distilled water outlet. The raw water in the tube side continues to evaporate to produce new steam, repeating the cycle. The concentrated water and distilled water discharged from the evaporator enter the preheating heat exchanger group respectively, transferring waste heat to the newly entering raw water. Finally, the distilled water is collected in a storage tank and output as pure steam.
[0033] In an optional embodiment, the preheating heat exchanger group includes a first heat exchanger H1, a second heat exchanger H2, a third heat exchanger H3, a fourth heat exchanger H4, and a fifth heat exchanger H5; the tube sides of the first heat exchanger H1, the second heat exchanger H2, the third heat exchanger H3, the fourth heat exchanger H4, and the fifth heat exchanger H5 are sequentially connected; the shell side of the first heat exchanger H1 is connected to the non-condensable gas discharge port of the heater H6 and the outside.
[0034] In this embodiment, the shell side of the first heat exchanger H1 is connected to the non-condensable gas discharge port of the heater H6 and the outside through two branch pipes respectively. That is, one branch pipe receives the non-condensable gas discharged from the heater H6, and the other branch pipe is used to discharge the non-condensable gas after heat exchange through the system's non-condensable gas discharge port D. The tube side inlet of the first heat exchanger H1 is directly used as the total inlet of the preheating heat exchanger group, that is, as the input end of the raw water. The tube side outlet is connected to the tube side inlet of the second heat exchanger H2 through a pipeline, forming a series preheating path for the raw water. Specifically, in this embodiment, the function of the first heat exchanger H1 is to recover the heat from the non-condensable gas. The non-condensable gas discharged from the heater H6 enters the shell side of the first heat exchanger H1 and exchanges heat with the raw water in the tube side. After releasing heat, the temperature of the non-condensable gas decreases and it is discharged from the shell side outlet; the temperature of the raw water increases after absorbing heat, laying the foundation for the subsequent preheating process. By setting up the first heat exchanger H1, the heat of the non-condensable gas that was originally directly emitted can be recovered, reducing the system's demand for external energy. At the same time, the temperature of the non-condensable gas decreases during the heat exchange process, which can reduce the thermal pollution to the environment caused by direct emissions, thus combining energy saving and environmental protection value. It is understandable that the first heat exchanger H1 can be the shell-and-tube heat exchanger mentioned above, but it is not limited to this structure. It can also be other types of heat exchangers, such as spiral plate heat exchangers, which use spiral channels to make the fluid flow path longer and the heat exchange more complete. In other words, as long as heat exchange can be used to recover heat from non-condensable gases and preheat the raw water, it is acceptable.
[0035] In an optional embodiment, the shell side of the second heat exchanger H2 is connected to the concentrate drain end of the evaporator for recovering heat from the evaporator.
[0036] In this embodiment, the shell side of the second heat exchanger H2 is connected to the concentrate drain end of the evaporator through a main pipe. The concentrate drain end of each evaporator is connected to the main pipe through a branch pipe. The tube side inlet of the second heat exchanger H2 is connected to the tube side outlet of the first heat exchanger H1, and the tube side outlet is connected to the tube side inlet of the third heat exchanger H3 through a pipe, forming a continuous preheating path for the raw water.
[0037] In this embodiment, the second heat exchanger H2 can recover the heat from the concentrated water discharged from the evaporator. The concentrated water discharged from the evaporator is not completely evaporated and its temperature is close to the evaporation temperature, so it contains a lot of waste heat. Direct discharge would result in energy waste. The second heat exchanger H2 receives the concentrated water through the shell side and transports the raw water preheated by the first heat exchanger H1 through the tube side, so that the heat of the concentrated water is transferred to the raw water, thereby realizing waste heat recovery.
[0038] Meanwhile, the temperature of the concentrate decreases during the heat exchange process, which can reduce the thermal shock to subsequent concentrate treatment equipment and extend the equipment life.
[0039] In operation, the raw water preheated by the first heat exchanger H1 enters the tube side of the second heat exchanger H2 and flows along the tube side to the third heat exchanger H3. Simultaneously, the concentrate discharged from each evaporator enters the shell side of the second heat exchanger H2 through a collection pipe, flowing counter-currently to the raw water in the tube side. During this flow, the heat from the concentrate is transferred to the raw water through the tube walls, further increasing the raw water temperature while gradually decreasing the concentrate temperature.
[0040] After heat exchange, the raw water enters the third heat exchanger H3 from the tube side outlet of the second heat exchanger H2; the concentrated water after heat exchange is discharged from the shell side outlet of the second heat exchanger H2 and can be directly entered into the concentrated water treatment system or reused.
[0041] In an optional embodiment, the tube side of the third heat exchanger H3 is connected to the tube side of the second heat exchanger H2 and the tube side of the third heat exchanger H3, respectively. The inlet end of the shell side of the third heat exchanger H3 is connected to the industrial steam outlet of the heater H6 and the shell side of the fifth heat exchanger H5. The outlet end of the shell side of the third heat exchanger H3 is connected to the industrial steam condensate outlet F of the system.
[0042] In this embodiment, the tube-side inlet of the third heat exchanger H3 is connected to the tube-side outlet of the second heat exchanger H2, and the tube-side outlet is connected to the tube-side inlet of the fourth heat exchanger H4; the shell-side inlet of the third heat exchanger H3 is connected to the industrial steam outlet of the heater H6 through two pipelines, respectively, to receive the industrial steam condensate discharged from the heater H6 and the industrial steam condensate output from the shell side of the fifth heat exchanger H5, forming a waste heat recovery path for the industrial steam condensate.
[0043] In operation, the raw water preheated by the second heat exchanger H2 enters the tube side of the third heat exchanger H3 and flows towards the fourth heat exchanger H4. The industrial steam condensate discharged from the heater H6 and the industrial steam condensate discharged from the shell side of the fifth heat exchanger H5 merge and enter the shell side of the third heat exchanger H3 through pipelines, flowing counter-currently to the raw water in the tube side. During this flow, the heat of the condensate is transferred to the raw water through the tube walls, significantly increasing the raw water temperature and decreasing the condensate temperature.
[0044] After heat exchange, the raw water enters the fourth heat exchanger H4 from the tube side outlet of the third heat exchanger H3; the condensate after heat exchange flows out from the shell side outlet of the third heat exchanger H3 and is discharged from the system through the industrial steam condensate outlet F.
[0045] In an optional embodiment, the tube side of the fourth heat exchanger H4 is connected to the tube side of the third heat exchanger H4 and the tube side of the fifth heat exchanger H5, respectively; the shell side of the fourth heat exchanger H4 is connected to the distilled water outlet of the evaporator and the outside.
[0046] In this embodiment, the tube-side inlet of the fourth heat exchanger H4 is connected to the tube-side outlet of the third heat exchanger H3, and the tube-side outlet is connected to the tube-side inlet of the fifth heat exchanger H5. The shell side of the fourth heat exchanger H4 is connected to the distilled water outlet of the evaporator and the outside through two pipes respectively, receiving the distilled water generated by the evaporator, and discharging the distilled water after heat exchange through the system's distilled water drain outlet B, forming a waste heat recovery path for distilled water.
[0047] Specifically, in this embodiment, the function of the fourth heat exchanger H4 is to recover the heat from the distilled water produced by the evaporator. The distilled water produced by the evaporator needs to be cooled to the operating temperature before being output. The fourth heat exchanger H4 receives the distilled water through the shell side and transports the raw water preheated by the third heat exchanger H3 through the tube side, so that the residual heat of the distilled water can be transferred to the raw water, achieving simultaneous cooling and preheating.
[0048] This process avoids the heat waste caused by directly cooling distilled water, and further increases the temperature of the raw water, thus reducing the energy consumption of heater H6.
[0049] In operation, the raw water preheated by the third heat exchanger H3 enters the tube side of the fourth heat exchanger H4 and flows towards the fifth heat exchanger H5; the distilled water produced by the evaporator enters the shell side of the fourth heat exchanger H4 through the collection pipe, flowing counter-currently to the raw water in the tube side. During the flow, the heat of the distilled water is transferred to the raw water through the tube wall, further increasing the raw water temperature while reducing the distilled water temperature to the target operating temperature.
[0050] After heat exchange, the raw water enters the fifth heat exchanger H5 from the tube side outlet of the fourth heat exchanger H4; the distilled water after heat exchange is discharged from the shell side outlet of the fourth heat exchanger H4 and is directly delivered to the user end as pure steam product, such as the sterilization process in a pharmaceutical production line.
[0051] In an optional embodiment, the tube side of the fifth heat exchanger H5 is connected to the tube side of the fourth heat exchanger H4 and the atomizing nozzle B1 of the heater H6, respectively; the shell side of the fifth heat exchanger H5 is connected to the shell side of the third heat exchanger H3 and industrial steam, respectively.
[0052] In this embodiment, the tube-side inlet of the fifth heat exchanger H5 is connected to the tube-side outlet of the fourth heat exchanger H4, and the tube-side outlet is connected to the atomizing nozzle B1 of the heater H6. That is, the raw water directly enters the heater H6 after passing through the fifth heat exchanger H5. The shell side of the fifth heat exchanger H5 is connected to the industrial steam supply end and the shell side of the third heat exchanger H3 through two pipelines respectively. The industrial steam exchanges heat with the raw water, and the cooled industrial steam condensate is transported to the shell side of the third heat exchanger H3 to exchange heat with the low-temperature raw water in the third heat exchanger H3 again, and finally outputs low-temperature industrial steam condensate.
[0053] The function of the fifth heat exchanger H5 is to preheat the raw water to the preset temperature for entering the heater H6, which is usually close to the boiling point.
[0054] By preheating the water in the fifth heat exchanger H5, it can be ensured that the raw water entering the heater H6 only needs a small amount of heating to reach a near-evaporation state, thereby reducing the load on the heater H6 and stabilizing the temperature of the raw water entering the evaporator, thus ensuring evaporation efficiency.
[0055] In an optional embodiment, the preheating heat exchanger assembly further includes a regulating valve T1; the inlet of the regulating valve T1 is connected between the tube side of the third heat exchanger H3 and the fourth heat exchanger H4, and the outlet of the regulating valve T1 is connected to the tube side inlet of the fifth heat exchanger H5.
[0056] In this embodiment, the preheating heat exchanger group also includes a regulating valve T1; the inlet of the regulating valve T1 is connected between the tube side of the third heat exchanger H3 and the fourth heat exchanger H4 through a branch pipe, that is, the branch pipe is led out from the tube side outlet of the third heat exchanger H3 and connected to the regulating valve T1, and the outlet of the regulating valve T1 is connected to the tube side inlet of the fifth heat exchanger H5 through a branch pipe, that is, the branch pipe is connected to the main pipe of the tube side inlet of the fifth heat exchanger H5, forming a bypass regulation path for the raw water.
[0057] The core function of regulating valve T1 is to regulate the temperature of raw water before it enters the fifth heat exchanger H5. When the temperature of the raw water preheated by the third heat exchanger H3 is too high, such as exceeding the processing capacity of the fourth heat exchanger H4, or too low and needs to bypass the fourth heat exchanger H4 for direct heating, the opening of regulating valve T1 can be adjusted to control a portion of the raw water to bypass the fourth heat exchanger H4 and directly enter the fifth heat exchanger H5. This allows for flexible adjustment of the raw water mixing temperature entering the fifth heat exchanger H5, ensuring that the raw water reaches the preset value after final preheating.
[0058] This adjustment function can cope with operating conditions such as fluctuations in the initial temperature of raw water and changes in system load, thereby improving the stability and adaptability of system operation.
[0059] During operation, temperature sensors monitor the raw water temperature at the outlet of the third heat exchanger H3, the outlet of the fourth heat exchanger H4, and the inlet of the fifth heat exchanger H5 in real time. When the mixed water temperature is higher than the preset value, the opening of regulating valve T1 is increased to increase the bypass flow; when the mixed water temperature is lower than the preset value, the opening of regulating valve T1 is decreased to reduce the bypass flow, allowing more raw water to absorb heat through the fourth heat exchanger H4 before entering the fifth heat exchanger H5. Through dynamic adjustment, the temperature of the raw water entering the fifth heat exchanger H5 is ensured to remain stable.
[0060] In an optional embodiment, the distilled water outlet of the evaporator is connected to a water storage tank, and the outlet of the water storage tank is connected to the preheating heat exchanger assembly.
[0061] In this embodiment, the distilled water outlet of the evaporator is connected to a water storage tank through a connecting pipeline. The water storage tank has an air inlet at the top and a water outlet at the bottom. The water outlet of the water storage tank is connected to the preheating heat exchanger group through a pipeline, specifically the shell-side inlet of the fourth heat exchanger H4, forming a path for temporary storage of distilled water and recovery of waste heat.
[0062] The core function of the water storage tank is to temporarily store the distilled water produced by the evaporator, balancing the system's water production and usage rhythm. When the user's water consumption is less than the evaporator's water production, the distilled water is temporarily stored in the water storage tank to avoid system pressure fluctuations; when the user's water consumption is high, the water storage tank releases the stored water to ensure continuous water supply.
[0063] Meanwhile, the outlet of the water storage tank is connected to the preheating heat exchanger group, so that the temporarily stored distilled water enters the fourth heat exchanger H4 to release waste heat before being output, thus combining water storage with energy saving and avoiding the natural loss of heat caused by long-term storage of distilled water.
[0064] During operation, the distilled water produced by the evaporator continuously flows into the storage tank through the collection pipeline, and the water level in the tank gradually rises. When the water level reaches the upper limit, the number of evaporators in operation can be appropriately reduced to decrease water production and avoid overflow. When the user needs distilled water, the valve at the outlet of the storage tank is opened, and the distilled water flows out under the pressure inside the tank. It then enters the shell side of the fourth heat exchanger H4 through the pipeline, exchanges heat with the raw water in the tube side, and is output to the user from the shell side outlet of the fourth heat exchanger H4.
[0065] In an optional embodiment, a water pump is provided between the water storage tank and the preheating heat exchanger assembly.
[0066] In this embodiment, a water pump is installed on the pipeline between the water storage tank and the shell side of the fourth heat exchanger H4. The water pump inlet is connected to the water outlet of the water storage tank, and the outlet is connected to the shell side inlet of the fourth heat exchanger H4, forming a forced delivery path for distilled water.
[0067] Specifically, in this embodiment, the water pump provides power to the distilled water in the storage tank, ensuring its stable flow into the fourth heat exchanger H4. There may be a height difference or resistance loss between the storage tank and the fourth heat exchanger H4, such as due to long pipeline lengths or numerous valves. Relying solely on gravity or tank pressure is insufficient to guarantee a stable flow rate of the distilled water. The water pump, through mechanical work, pressurizes and delivers the distilled water, allowing for precise flow control and ensuring stable heat exchange efficiency of the fourth heat exchanger H4.
[0068] Meanwhile, the water pump can adjust the output flow rate according to the heat exchange requirements of the fourth heat exchanger H4, such as changes in the raw water flow rate, to achieve dynamic matching of waste heat recovery of distilled water.
[0069] Secondly, the present invention provides a method for preparing distilled water using a modular distillation water machine as described in any of the foregoing embodiments, comprising the following steps: (1) Raw water enters the multi-stage preheating heat exchanger group from the raw water inlet A, and after multi-stage preheating treatment, it is delivered to the heater H6; (2) Before the raw water enters the heater H6, it is atomized through the atomizing nozzle B1 at the inlet of the heater H6 to remove non-condensable gas in the raw water; (3) The atomized raw water is heated to a near-evaporation state in heater H6 and then transported to multiple evaporators connected in parallel; (4) The near-evaporation state of raw water evaporates in the evaporator to generate steam, and the steam is sent to the compressor for pressurization and heating. The pressurized and heated steam is then sent to the shell side of the evaporator. (5) The steam after being pressurized and heated in the shell side of the evaporator exchanges heat with the near-evaporated raw water in the tube side of the evaporator. The steam condenses to form distilled water, and the near-evaporated raw water in the tube side further evaporates to produce steam, repeating the cycle of step (4). (6) The distilled water produced by the evaporator is collected and transported to the water for injection storage tank. The non-condensable gas discharged from the water for injection storage tank and the non-condensable gas discharged from the heater H6 are transported together to the heat exchanger in the multi-stage preheating heat exchanger group to recover the heat of the non-condensable gas, and exchange heat with the raw water to recover the heat in the non-condensable gas.
[0070] In this embodiment, distilled water is prepared using the modular distillation water machine provided in the previous embodiment. The preparation process is achieved through six steps, each step corresponding to the operation flow of the equipment, forming a complete closed loop of raw water pretreatment - heating - evaporation - steam circulation - waste heat recovery.
[0071] Step (1) The temperature of the raw water is increased by multi-stage preheating to reduce the energy consumption of subsequent heating. The raw water enters the preheating heat exchanger group from the raw water inlet A, and absorbs the residual heat of non-condensable gas, concentrated water, industrial steam condensate and distilled water in sequence. The temperature gradually increases, laying the foundation for subsequent heating to a near-evaporation state.
[0072] Step (2) can remove non-condensable gases from the raw water. Before entering the heater H6, the raw water is atomized by the atomizing nozzle B1. The large surface area of the small droplets promotes the release of dissolved non-condensable gases, preventing them from entering the evaporator and affecting the purity of the steam.
[0073] Step (3) Heat the raw water to a near-evaporation state. The atomized raw water absorbs heat in heater H6 and reaches a state close to the boiling point, which facilitates rapid evaporation in the evaporator.
[0074] Step (4) realizes the recycling of steam. The steam generated by the evaporator is pressurized and heated by the compressor to become a high-temperature heat source, which can be reused for heating the evaporator to improve energy utilization efficiency.
[0075] Step (5) continuously produces distilled water. High-temperature steam condenses and releases heat in the shell side of the evaporator, causing the raw water in the tube side to continuously evaporate, forming a cycle of evaporation-pressurization-condensation-re-evaporation, and stably producing distilled water.
[0076] Step (6) Recover waste heat from the system. The waste heat from distilled water, concentrated water, and non-condensable gases is transferred to the raw water through a preheating heat exchanger group, realizing the cascade utilization of energy while ensuring the purity and stability of the distilled water.
[0077] In this embodiment, through multi-stage preheating in step (1), the raw water absorbs low-grade waste heat in the system, such as non-condensable gas and concentrated water, reducing the dependence on high-grade energy such as industrial steam; the atomization degassing in step (2) is based on the principle of gas-liquid balance. After atomization, the surface pressure of the droplets decreases, and the dissolved gas is more likely to escape, thus improving the purity of the steam from the source; the circulation in steps (3)-(5) is based on the principle of heat pump. The compressor consumes a small amount of electrical energy to pressurize the low-pressure steam into high-pressure steam, and the temperature rises, realizing the transfer of heat from low temperature to high temperature, so that the steam can be used as a heat source for recycling; the waste heat recovery in step (6) maximizes the temperature difference through countercurrent heat exchange, thereby improving the heat recovery efficiency.
[0078] The beneficial effects of the embodiments of the present invention are: Modular design, flexible capacity adjustment: The modular structure with multiple evaporators connected in parallel allows for step-by-step capacity adjustment by starting and stopping some evaporators and corresponding compressors, adapting to water demand at different times and avoiding energy waste; when a single evaporator or compressor fails, the remaining modules can operate normally, ensuring continuous production and significantly improving stability. Multi-stage waste heat recovery, significant energy saving effect: The preheating heat exchanger group uses multi-stage heat exchange to recover system waste heat, and at the same time uses a composite heat source to achieve final preheating of raw water, which greatly reduces the dependence on external energy sources such as industrial steam, improves energy utilization efficiency, and significantly reduces operating costs. Removing non-condensable gases and ensuring the purity of distilled water: The atomizing nozzle at the heater inlet can atomize the raw water, promote the full release of non-condensable gases, and prevent non-condensable gases from entering the evaporator and affecting the purity of the steam; at the same time, no impurities are introduced during the waste heat recovery process, further ensuring the high purity of distilled water. Compact structure and strong adaptability: Each module (evaporator, heat exchanger) is independent and easy to connect. The number of evaporators can be increased or decreased according to actual production capacity requirements to adapt to different scale production scenarios. The overall structure of the equipment is compact, occupies a small area, and is easy to install and maintain.
[0079] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. A modular water distiller, characterized in that, It includes the raw water inlet, preheating heat exchanger group, heater, compressor and multiple evaporators connected in parallel; The raw water inlet is connected to the inlet of the preheating heat exchanger group, the outlet of the preheating heat exchanger group is connected to the inlet of the heater, the inlet of the heater is provided with an atomizing nozzle, the liquid outlet of the heater is connected to the inlet of multiple parallel evaporators, and the non-condensable gas outlet of the heater is connected to the preheating heat exchanger group. The evaporator is connected to the compressor, which is used to pressurize the steam in the evaporator. The distilled water outlet and the concentrated water outlet of the evaporator are both connected to the preheating heat exchanger assembly.
2. The modular water distiller according to claim 1, characterized in that, The preheating heat exchanger group includes a first heat exchanger, a second heat exchanger, a third heat exchanger, a fourth heat exchanger, and a fifth heat exchanger. The tube sides of the first heat exchanger, the second heat exchanger, the third heat exchanger, the fourth heat exchanger, and the fifth heat exchanger are connected in sequence; The shell side of the first heat exchanger is connected to the non-condensable gas outlet of the heater and the outside.
3. The modular distillation water machine according to claim 2, characterized in that, The shell side of the second heat exchanger is connected to the concentrate drain end of the evaporator for recovering heat from the evaporator.
4. The modular water distiller according to claim 2, characterized in that, The tube side of the third heat exchanger is connected to the tube side of the second heat exchanger and the tube side of the third heat exchanger respectively. The inlet end of the shell side of the third heat exchanger is connected to the industrial steam outlet of the heater and the shell side of the fifth heat exchanger. The outlet end of the shell side of the third heat exchanger is connected to the industrial steam condensate outlet of the system.
5. The modular water distiller according to claim 2, characterized in that, The tubes of the fourth heat exchanger are connected to the tubes of the third and fifth heat exchangers at both ends, respectively. The shell side of the fourth heat exchanger is connected to the distilled water outlet of the evaporator and the outside.
6. The modular water distiller according to claim 2, characterized in that, The tube side of the fifth heat exchanger is connected to the tube side of the fourth heat exchanger and the atomizing nozzle of the heater, respectively. The shell side of the fifth heat exchanger is connected to the shell side of the third heat exchanger and industrial steam, respectively.
7. The modular water distiller according to claim 2, characterized in that, The preheating heat exchanger assembly also includes a regulating valve; The inlet of the regulating valve is connected between the tube side of the third heat exchanger and the fourth heat exchanger, and the outlet of the regulating valve is connected to the tube side inlet of the fifth heat exchanger.
8. The modular water distiller according to claim 1, characterized in that, The distilled water outlet of the evaporator is connected to a water storage tank, and the outlet of the water storage tank is connected to the preheating heat exchanger assembly.
9. The modular water distiller according to claim 8, characterized in that, A water pump is provided between the water storage tank and the preheating heat exchanger assembly.
10. A method for preparing distilled water using a modular distillation water machine according to any one of claims 1-9, characterized in that, Includes the following steps: (1) Raw water enters the multi-stage preheating heat exchanger group from the raw water inlet, and is then transported to the heater after multi-stage preheating treatment; (2) Before the raw water enters the heater, it is atomized through the atomizing nozzle at the heater inlet to remove non-condensable gases from the raw water; (3) The atomized raw water is heated to a near-evaporation state in the heater and then transported to multiple evaporators connected in parallel; (4) The near-evaporation state of raw water evaporates in the evaporator to generate steam, and the steam is sent to the compressor for pressurization and heating. The pressurized and heated steam is then sent to the shell side of the evaporator. (5) The steam after being pressurized and heated in the shell side of the evaporator exchanges heat with the near-evaporated raw water in the tube side of the evaporator. The steam condenses to form distilled water, and the near-evaporated raw water in the tube side further evaporates to produce steam, repeating the cycle of step (4). (6) The distilled water produced by the evaporator is collected and transported to the water for injection storage tank. The non-condensable gas discharged from the water for injection storage tank and the non-condensable gas discharged from the heater are transported together to the heat exchanger in the multi-stage preheating heat exchanger group to recover the heat of the non-condensable gas, and exchange heat with the raw water to recover the heat in the non-condensable gas.