Vapor compression system
Through the independent heating subsystem and refrigerant compression solution, the problems of easy corrosion of steam compressor and accumulation of inert gas are solved, the versatility and efficient and stable operation of the system are achieved, and the cost is reduced.
Patent Information
- Application Number
- CN202422619583.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2034-10-29
AI Technical Summary
The steam compressor in the existing MVR system has poor versatility and is easily corroded, resulting in high purchase and maintenance costs. It is also inefficient in negative pressure environments, and the accumulation of inert gas causes the system to fail to operate normally.
Adopting independent first heating subsystem and second heating subsystem, the steam compressor does not come into direct contact with the material, uses refrigerant for compression, and combines with intermediate heat exchanger and pressure reducing valve to achieve the versatility and stable operation of the steam compressor.
It reduces the purchase and maintenance costs of the steam compression system, improves the efficiency of the system in a negative pressure environment, avoids the accumulation of inert gas, and ensures the stable operation of the system.
Smart Images
Figure CN223392905U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of evaporation and concentration, and in particular to a vapor compression system. Background Art
[0002] At present, MVR (Mechanical vapor recompression) system is widely used in the field of evaporation and concentration. Figure 1 As shown, a conventional MVR system includes key components such as a preheater 10', a circulating pump 20', a heater 30', an evaporation chamber 40', and a steam compressor 60'. The general principle is that the feedstock liquid is preheated in the preheater 10' and then, driven by the circulating pump 20', enters the heater 30'. In the heater 30', the feedstock liquid exchanges heat with high-temperature steam, raising its temperature. The heated feedstock liquid then flows through the circulating pump into the evaporation chamber 40'. Secondary steam generated in the evaporation chamber 40' overflows from the feedstock liquid, concentrating it and discharging it supersaturated. The unsaturated feedstock liquid, driven by the circulating pump 20', re-enters the heater 30' along with fresh feedstock liquid, continuing the evaporation and concentration cycle. The secondary steam generated in the evaporation chamber 40' is then transported to the steam compressor 60', which compresses the secondary steam and then transports it to the heater 30' and preheater 10' as heating steam, thus utilizing thermal energy.
[0003] However, during use, the existing MVR system has the following disadvantages:
[0004] 1. The steam compressor 30' used has poor versatility. For some acidic or alkaline materials that need to be concentrated and distilled, the secondary steam from the evaporation chamber 40' enters the steam compressor 60' due to its corrosiveness, which will corrode its internal components. Therefore, it needs to be customized and developed according to the acidity and alkalinity of the material, and the machine must be used for a specific purpose, which makes the purchase cost high.
[0005] 2. When the steam compressor 60' and the pipe connection components are corroded, the airtightness of the entire system will be lost. In some specific application scenarios, such as negative pressure and low temperature environments, the loss of airtightness will cause the operating conditions of the entire system to change, and ultimately the concentrated distillation products will not achieve the expected results.
[0006] 3. When the system needs to operate in a negative pressure environment, the volume of the negative pressure gas will expand, the efficiency of the steam compressor 60' will decrease, the power of the steam compressor 60' will increase, and the volume of the steam compressor 60' will also be very large, and the airtightness cannot be guaranteed.
[0007] 4. When inert gas exists in the secondary steam, as the system operation time increases, the non-condensable inert gas will continue to accumulate in the steam compressor 60', eventually causing the entire system to fail to operate normally. Therefore, the system must be shut down regularly to discharge the accumulated inert gas before it can be restarted, which reduces operating efficiency. Utility Model Content
[0008] In response to the problems in the prior art, the purpose of this application is to provide a steam compression system that eliminates the need for customized development of the steam compressor, thereby reducing the purchase cost and maintenance cost of the system.
[0009] The embodiment of the present application provides a vapor compression system, comprising a preheating subsystem, a first heating subsystem, a second heating subsystem and an evaporation subsystem, wherein:
[0010] The first inlet of the first heating subsystem is connected to the first outlet of the preheating subsystem;
[0011] The first outlet of the first heating subsystem is connected to the inlet of the evaporation subsystem, and the first outlet of the evaporation subsystem is used to discharge the evaporated concentrated raw material; the second outlet of the evaporation subsystem is connected to the second heating subsystem, and is used to exchange heat between the steam generated in the evaporation subsystem and the second heating subsystem;
[0012] The outlet of the second heating subsystem is connected to the second inlet of the first heating subsystem, and the inlet of the second heating subsystem is connected to the second outlet of the first heating subsystem; the first inlet and the second inlet of the first heating subsystem are connected to form a first connecting path, and the second inlet and the second outlet of the first heating subsystem are connected to form a second connecting path, and the first connecting path and the second connecting path are not connected.
[0013] In some embodiments, the first heating subsystem includes a heater, the second heating subsystem includes a steam compressor, the second inlet of the heater is connected to the outlet of the steam compressor, and the second outlet of the heater is connected to the inlet of the steam compressor.
[0014] In some embodiments, the second heating subsystem further includes an intermediate heat exchanger, wherein a second inlet of the intermediate heat exchanger is connected to an outlet of the steam compressor, and a second outlet of the intermediate heat exchanger is connected to an inlet of the steam compressor.
[0015] In some embodiments, the evaporation subsystem includes an evaporation chamber, a first outlet of the evaporation chamber is used to discharge the evaporated concentrated raw material, and a second outlet of the evaporation chamber is connected to the first inlet of the intermediate heat exchanger.
[0016] In some embodiments, the third outlet of the evaporation subsystem is connected to the first outlet of the preheating subsystem to transport the unsaturated solution in the evaporation subsystem to the first heating subsystem.
[0017] In some embodiments, the preheating subsystem includes a preheater, wherein the first inlet of the preheater is connected to the outlet of the feed subsystem, the first outlet of the preheater is connected to the first inlet of the heater, the second inlet of the preheater is connected to the first outlet of the intermediate heat exchanger, and the second outlet of the preheater is used to discharge condensed water.
[0018] In some embodiments, the second heating subsystem further includes a pressure reducing valve disposed between the second outlet of the heater and the second inlet of the intermediate heat exchanger.
[0019] In some embodiments, the steam compressor is a centrifugal compressor.
[0020] In some embodiments, the centrifugal compressor contains refrigerant.
[0021] In some embodiments, a feed subsystem is further included, and the feed subsystem includes a raw material buffer tank and a feed pump arranged in series, and the outlet of the feed pump is connected to the first inlet of the preheater.
[0022] The steam compression system provided by this application has the following advantages:
[0023] In the technical solution of this application, the material is transformed from the liquid phase to the vapor phase after passing through the preheating subsystem, the first heating subsystem, and the second heating subsystem. The vapor phase material then enters the evaporation subsystem, which utilizes the different volatilities of the material components to separate substances with different boiling points. The first and second heating subsystems operate independently to heat the material, and the second heating subsystem does not come into direct contact with the material. Therefore, the steam compressor in the second heating subsystem does not need to be customized based on the acidity or alkalinity of the material, resulting in high versatility and reduced acquisition costs for the steam compression system. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Other features, objects and advantages of the present application will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings.
[0025] Figure 1 is a schematic diagram of an MVR system in the prior art;
[0026] Figure 2 is a schematic diagram of a steam compression system provided in one embodiment of the present application;
[0027] Figure 3is a schematic diagram of a preheater provided in one embodiment of the present application;
[0028] Figure 4 is a schematic diagram of a heater provided in one embodiment of the present application;
[0029] Figure 5 is a schematic diagram of an intermediate heater provided in one embodiment of the present application;
[0030] Figure 6 Schematic diagram of an evaporation chamber provided in one embodiment of the present application.
[0031] Reference numerals:
[0032] 10 Preheater 40 evaporation chamber
[0033] 10a1 First inlet of preheater 40a1 First inlet of evaporation chamber
[0034] 10b1 First outlet of preheater 40b1 First outlet of evaporation chamber
[0035] 10a2 Second inlet of preheater 40b2 Second outlet of evaporation chamber
[0036] 10b2 Second outlet of preheater 40b3 Third outlet of evaporation chamber
[0037] 20 Circulation pump 50 Intermediate heat exchanger
[0038] 30 Heater 50a1 First inlet of intermediate heat exchanger
[0039] 30a1 First inlet of the heater 50b1 First outlet of the intermediate heat exchanger
[0040] 30b1 First outlet of heater 50a2 Second inlet of intermediate heat exchanger
[0041] 30a2 Second inlet of the heater 50b2 Second outlet of the intermediate heat exchanger
[0042] 30b2 Second outlet of heater 60 Steam compressor
[0043] 70 pressure reducing valve DETAILED DESCRIPTION
[0044] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Identical reference numerals in the drawings represent identical or similar structures, and thus repeated descriptions thereof will be omitted.
[0045] To solve the problems in the prior art, an embodiment of the present application provides a steam compression system, including a preheating subsystem, a first heating subsystem, a second heating subsystem and an evaporation subsystem, wherein the first inlet of the first heating subsystem is connected to the first outlet of the preheating subsystem; the first outlet of the first heating subsystem is connected to the inlet of the evaporation subsystem, and the first outlet of the evaporation subsystem is used to discharge the concentrated raw material after evaporation; the second outlet of the evaporation subsystem is connected to the second heating subsystem to exchange heat between the steam generated in the evaporation subsystem and the second heating subsystem; the outlet of the second heating subsystem is connected to the second inlet of the first heating subsystem, and the inlet of the second heating subsystem is connected to the second outlet of the first heating subsystem; the first inlet and the second inlet of the first heating subsystem are connected to form a first connecting path, the second inlet and the second outlet of the first heating subsystem are connected to form a second connecting path, and the first connecting path and the second connecting path are not connected.
[0046] In the technical solution of this application, the material is transformed from the liquid phase to the vapor phase after passing through the preheating subsystem, the first heating subsystem, and the second heating subsystem. The vapor phase material then enters the evaporation subsystem, which utilizes the different volatilities of the material components to separate substances with different boiling points. The first and second heating subsystems operate independently to heat the material, and the second heating subsystem does not come into direct contact with the material. Therefore, the steam compressor in the second heating subsystem does not need to be customized based on the acidity or alkalinity of the material, resulting in high versatility and reduced acquisition costs for the steam compression system.
[0047] The steam compression system provided in this application will be explained below with reference to specific embodiments.
[0048] Specifically, such as Figures 2 to 6 As shown, an embodiment of the present application provides a vapor compression system, including a preheating subsystem, a first heating subsystem, a second heating subsystem and an evaporation subsystem.
[0049] like Figure 2 and Figure 4 As shown, the first heating subsystem includes a heater 30 , the second heating subsystem includes a steam compressor 60 , the second inlet 30 a 2 of the heater 30 is connected to the outlet of the steam compressor 60 , and the second outlet 30 b 2 of the heater 30 is connected to the inlet of the steam compressor 60 .
[0050] Furthermore, in the embodiment of the present application, the heater 30 may be a shell-and-tube heat exchanger. The first inlet 30a1 of the heater 30 is a tube-side inlet, the first outlet 30b1 of the heater 30 is a tube-side outlet, the second inlet 30a2 of the heater 30 is a shell-side inlet, and the second outlet 30b2 of the heater 30 may be a shell-side outlet.
[0051] Furthermore, in the embodiment of the present application, the steam compressor 60 may be a centrifugal compressor. A centrifugal steam compressor converts mechanical energy into gas pressure energy by using an impeller to perform work on the gas, utilizing centrifugal pressure-increasing and speed-down pressure-expanding effects. During this process, the gas is compressed, causing its temperature and pressure to increase accordingly. In this embodiment, the centrifugal compressor contains refrigerant, and the refrigerant's temperature and pressure are increased by compressing the refrigerant.
[0052] The second inlet 30a2 and the second outlet 30b2 of the heater 30 are connected to form a second communication path (shell side). The refrigerant compressed by the steam compressor 60 undergoes heat exchange with the liquid entering the heater 30 through the second communication path (i.e., heat is released to increase the temperature of the material), and then returns to the steam compressor 60 to begin a new round of compression, repeating the cycle. It should be noted that the refrigerant has a small specific volume, and the use of refrigerant eliminates the need to oversize the compressor. The steam compressor 60 operates independently and does not interfere with the material. Therefore, no inert gas accumulates in the steam compressor 60, and the system does not need to exhaust inert gas for maintenance, reducing the maintenance cost of the system.
[0053] In other embodiments, the steam compressor may also be a Roots steam compressor, a single-screw steam compressor, and a scroll steam compressor. Those skilled in the art may select the type of steam compressor according to actual needs, and no specific limitation is made here.
[0054] like Figure 2 and Figure 5 As shown, the second heating subsystem further includes an intermediate heat exchanger 50 , a second inlet 50 a 2 of the intermediate heat exchanger 50 is connected to the outlet of the steam compressor 60 , and a second outlet 50 b 2 of the intermediate heat exchanger 50 is connected to the inlet of the steam compressor 60 .
[0055] Furthermore, in this embodiment, the intermediate heat exchanger 50 may be a shell-and-tube heat exchanger. The first inlet 50a1 of the intermediate heat exchanger 50 is a tube-side inlet, the first outlet 50b1 of the intermediate heat exchanger 50 is a tube-side outlet, the second inlet 50a2 of the intermediate heat exchanger 50 is a shell-side inlet, and the second outlet 50b2 of the intermediate heat exchanger 50 is a shell-side outlet.
[0056] like Figure 2 and Figure 6As shown, the evaporation subsystem includes an evaporation chamber 40. A first outlet 40b1 of the evaporation chamber 40 is used to discharge the evaporated concentrated feedstock. A second outlet 40b2 of the evaporation chamber 40 is connected to a first inlet 50a1 of the intermediate heat exchanger 50. The second outlet of the evaporation chamber 40 is used to discharge secondary steam, which exchanges heat with the refrigerant passing through the intermediate heat exchanger 50 through the shell side of the intermediate heat exchanger 50, thereby recovering the waste heat of the secondary steam.
[0057] Furthermore, in this embodiment, the evaporation chamber 40 may include an evaporator, and the evaporator may be a falling film evaporator, a forced circulation evaporator, or a natural circulation evaporator.
[0058] like Figure 2 As shown, the third outlet of the evaporation subsystem is connected to the first outlet of the preheating subsystem to transport the unsaturated solution in the evaporation subsystem to the first heating subsystem. Figure 2 and Figure 3 As shown, the preheating subsystem includes a preheater 10, a first inlet 10a1 of the preheater 10 is connected to the outlet of the feeding subsystem (not shown in the figure), a first outlet 10b1 of the preheater 10 is connected to the first inlet 30a1 of the heater 30, and a second inlet 10a2 of the preheater 10 is connected to the first outlet 50b1 of the intermediate heat exchanger 50. The secondary steam after heat exchange in the intermediate heat exchanger 50 will enter the preheater 10 again for secondary heat exchange, and then the second outlet 10b2 of the preheater 10 will discharge the condensed water after heat exchange; the second outlet 50b2 of the evaporation chamber 40 is connected to the first outlet 10b1 of the preheater 10 to re-transport the unsaturated solution in the evaporation chamber 40 to the first heating subsystem for a new round of evaporation and concentration.
[0059] Furthermore, in this embodiment, the preheater 10 may be a shell and tube heat exchanger.
[0060] The first inlet 10a1 of the preheater 10 is a tube-side inlet, the first outlet 10b1 of the preheater 10 is a tube-side outlet, the second inlet 10a2 of the preheater 10 is a shell-side inlet, and the second outlet 10b2 of the preheater 10 is a shell-side outlet.
[0061] The second heating subsystem further includes a pressure reducing valve 70 disposed between the second outlet 30b2 of the heater 30 and the second inlet a2 of the intermediate heat exchanger 50. The pressure reducing valve 70 enables the steam compressor to operate stably under various operating conditions, thereby stabilizing the operation of the steam compression system.
[0062] Furthermore, the feed subsystem includes a raw material buffer tank and a feed pump which are sequentially connected in series, and the outlet of the feed pump is connected to the first inlet 10a1 of the preheater 10. The feed subsystem is used to continuously input materials into the preheating subsystem.
[0063] The working principle of the steam compression system provided by the present application is explained below. The material is preheated by the preheater 10, and the material enters the heater 30 under the action of the circulating pump 20. The heater 30 converts the material from liquid to gas, and the gaseous material then enters the evaporation chamber 40. The concentrated and evaporated saturated solution is discharged from the first outlet 40b1 of the evaporation chamber 40, and the secondary steam generated is discharged from the second outlet 40b2 of the evaporation chamber 40. The unsaturated solution is discharged from the third outlet 40b3 of the evaporation chamber 40 and re-enters the heater 30. The steam compressor 60 continuously provides heat energy to the heater 3 through compression work, converting the liquid material into gas. The secondary steam passes through the intermediate heat exchanger 50 and the preheater 10, and the refrigerant and the material use the waste heat of the secondary steam to exchange heat, thereby improving the utilization rate of thermal energy.
[0064] In summary, the steam compression system provided by this application has the following advantages:
[0065] The first heating subsystem and the second heating subsystem operate independently. The steam compressor in the second subsystem does not come into direct contact with the material, so the steam compressor is not affected by the material and does not require customized development, which can save system purchase costs.
[0066] The refrigerant is used in the steam compressor to compress and heat the steam. The refrigerant has a small specific volume, so the volume of the steam compressor does not need to be designed too large.
[0067] The first heating subsystem and the second heating subsystem operate independently, and the inert gas will not accumulate in the steam compressor. There is no need to shut down the steam compressor for maintenance, which improves the working efficiency of the system and reduces the maintenance cost of the system.
[0068] The above content is a further detailed description of the present application in conjunction with specific preferred embodiments, and the specific implementation of the present application cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, several simple deductions or substitutions can be made without departing from the concept of the present application, and all of them should be considered to fall within the scope of protection of the present application.
Claims
1. A steam compression system, characterized in that: It includes a preheating subsystem, a first heating subsystem, a second heating subsystem and an evaporation subsystem, wherein: The first inlet of the first heating subsystem is connected to the first outlet of the preheating subsystem; The first outlet of the first heating subsystem is connected to the inlet of the evaporation subsystem, and the first outlet of the evaporation subsystem is used to discharge the evaporated concentrated raw material; the second outlet of the evaporation subsystem is connected to the second heating subsystem, and is used to exchange heat between the steam generated in the evaporation subsystem and the second heating subsystem; The outlet of the second heating subsystem is connected to the second inlet of the first heating subsystem, and the inlet of the second heating subsystem is connected to the second outlet of the first heating subsystem; the first inlet and the second inlet of the first heating subsystem are connected to form a first connecting path, and the second inlet and the second outlet of the first heating subsystem are connected to form a second connecting path, and the first connecting path and the second connecting path are not connected.
2. The vapor compression system according to claim 1, wherein: The first heating subsystem includes a heater, the second heating subsystem includes a steam compressor, the second inlet of the heater is connected to the outlet of the steam compressor, and the second outlet of the heater is connected to the inlet of the steam compressor.
3. The vapor compression system according to claim 2, wherein: The second heating subsystem further includes an intermediate heat exchanger, wherein a second inlet of the intermediate heat exchanger is connected to an outlet of the steam compressor, and a second outlet of the intermediate heat exchanger is connected to an inlet of the steam compressor.
4. The vapor compression system according to claim 3, wherein: The evaporation subsystem includes an evaporation chamber, a first outlet of the evaporation chamber is used to discharge the evaporated concentrated raw material, and a second outlet of the evaporation chamber is connected to the first inlet of the intermediate heat exchanger.
5. The vapor compression system according to claim 4, characterized in that The third outlet of the evaporation subsystem is connected to the first outlet of the preheating subsystem for transporting the unsaturated solution in the evaporation subsystem to the first heating subsystem.
6. The vapor compression system according to claim 5, characterized in that The preheating subsystem includes a preheater, a first inlet of the preheater is connected to the outlet of the feed subsystem, a first outlet of the preheater is connected to the first inlet of the heater, a second inlet of the preheater is connected to the first outlet of the intermediate heat exchanger, and a second outlet of the preheater is used to discharge condensed water.
7. The vapor compression system according to claim 6, wherein: The second heating subsystem further includes a pressure reducing valve disposed between the second outlet of the heater and the second inlet of the intermediate heat exchanger.
8. The vapor compression system according to claim 2, wherein: The steam compressor is a centrifugal compressor.
9. The vapor compression system according to claim 8, wherein: The centrifugal compressor contains refrigerant.
10. The vapor compression system according to claim 6, wherein: The feeding subsystem includes a raw material buffer tank and a feeding pump which are sequentially arranged in series, and the outlet of the feeding pump is connected to the first inlet of the preheater.