Skid-mounted evaporation system

Abstract

The utility model relates to the technical field of evaporation systems, in particular to a skid-mounted evaporation system, which comprises a feed preheating unit, a cooling water tank and a preheater, the cooling water tank is connected with a feed pipeline and provided with a heat exchange coil, and the preheater is connected with the cooling water tank. The preheater comprises a discharge waste heat preheater and a condensate water waste heat preheater; the evaporation separation unit comprises an evaporation separator connected with the discharge waste heat preheater and the condensate water waste heat preheater at the same time, a water vapor compressor connected with the evaporation separator, and a condensate water tank connected with the water vapor compressor; wherein the condensate water tank is connected with the condensate water waste heat preheater through the condensate water pump; and the cooling unit comprises a pipeline arranged between the cooling water tank and the water vapor compressor, and a cooling water pump arranged on the pipeline.

Description

TECHNICAL FIELD

[0001] The utility model relates to evaporative system technical field especially relates to a kind of pry dress formula evaporative system. BACKGROUND

[0002] There is a kind of pry dress formula evaporative system using mechanical steam re-compression technology, which is an energy-saving technology that reduces the demand for external energy by utilizing the energy of secondary steam generated by the system itself. The principle is to increase the temperature and pressure of low-grade steam through a compressor, thereby increasing the enthalpy. Then the steam enters a heat exchanger and exchanges heat with the raw material liquid. The latent heat of the steam is used to evaporate the heated raw material liquid to produce low-grade steam, which is then compressed into high-grade steam by the compressor. This continuous evaporation and concentration process achieves energy saving for the system. The technology has been successfully applied in the fields of chemical industry, food industry, papermaking, pharmaceutical industry, seawater desalination and wastewater treatment.

[0003] For example, the publication number CN217511188U discloses a pry dress formula low-temperature MVR evaporation device. The leachate first enters the feed assembly, which delivers the internal leachate to the preheater. At the same time, the condenser delivers condensed water to the preheater. The preheater exchanges heat with the leachate and condensed water to increase their temperature. Then the leachate enters the evaporator for flash evaporation. The flash-evaporated leachate flows to the separator. There is a pressure difference between the separator and the evaporator. Due to the pressure difference, vaporization occurs instantly until the temperature of the leachate drops to the feed temperature. The flash-evaporated leachate in the separator is pumped back to the evaporator by the first circulating pump, heated and raised in temperature, and then enters the separator for flash evaporation and separation to continuously improve the separation efficiency. When the leachate reaches the designed evaporation concentration, it is discharged from the first pipeline.

[0004] For the pry dress formula low-temperature MVR evaporation device in the above-mentioned technology, the structure improves the efficiency of flash evaporation and separation, but it has the following problems:

[0005] Firstly, the leachate discharged from the first pipeline at the designed evaporation concentration is still in a high-temperature state. Directly discharging the leachate in this high-temperature state requires a high requirement for the discharge collection end and wastes the residual heat it carries.

[0006] Secondly, for the preheater used, including the condensed water preheating component and the non-condensable gas preheating component, although it can preheat the leachate, the preheating temperature is uncontrollable. Directly entering the evaporator and separator for circulation with the leachate in this condition increases the number of cycles of the leachate between the evaporator and the separator due to the pressure difference, thereby reducing the evaporation efficiency.

[0007] In summary, in view of the problems existing in the actual use of the existing pry-mounted evaporation system, the overall structure thereof needs to be further optimized. Utility model content

[0008] The utility model discloses a pry-mounted evaporation system to solve the technical problem of optimizing the overall use effect.

[0009] The pry-mounted evaporation system of the utility model is implemented as follows:

[0010] A pry-mounted evaporation system comprises:

[0011] A feed preheating unit comprising a cooling water tank with heat exchange coil connected with a feed pipeline and a preheater connected with the cooling water tank; the preheater comprises a discharge waste heat preheater and a condensate water waste heat preheater;

[0012] An evaporation separation unit comprising an evaporation separator connected with the discharge waste heat preheater and the condensate water waste heat preheater simultaneously, a water vapor compressor connected with the evaporation separator and a condensate water tank connected with the water vapor compressor; wherein the condensate water tank is connected with the condensate water waste heat preheater through a condensate water pump;

[0013] A cooling unit comprising a pipeline arranged between the cooling water tank and the water vapor compressor and a cooling water pump arranged on the pipeline.

[0014] In the optional implementation of the utility model, the evaporation separator adopts an integrated evaporation separation structure with a separation zone and an evaporation zone simultaneously.

[0015] In the optional implementation of the utility model, the evaporation separator is further connected with an overflow tank.

[0016] The overflow tank is provided with a third liquid level meter.

[0017] In the optional implementation of the utility model, the evaporation separator comprises a separator and an evaporator connected through a connecting pipe; wherein

[0018] The connecting pipe comprises a first connecting pipe and a second connecting pipe which are independent of each other; the first connecting pipe is provided with a first circulating pump;

[0019] The discharge waste heat preheater and the condensate water waste heat preheater are connected with the separator respectively.

[0020] In the optional implementation of the utility model, the evaporator is further connected with the condensate water tank.

[0021] In the optional implementation of the utility model, the separator is provided with a first liquid level meter and a first temperature sensor.

[0022] In optional implementation of the utility model, the separator is further provided with a heater for preheating the feed liquid in the separator.

[0023] The heater is arranged at the bottom of the separator or on the pipeline between the separator and the first circulating pump.

[0024] In optional implementation of the utility model, a discharge pipe is further arranged between the discharge waste heat preheater and the separator, and a discharge pump is arranged on the discharge pipe.

[0025] A discharge flow meter is further arranged on the discharge pipe.

[0026] In optional implementation of the utility model, a water spraying pipe is further arranged between the condensate tank and the water vapor compressor, and a water spraying pump suitable for pumping the condensate in the condensate tank into the water vapor compressor is arranged on the water spraying pipe.

[0027] By adopting the above technical scheme, the utility model has the following beneficial effects: the pry-mounted evaporation system of the utility model can reuse the waste heat of the discharged feed liquid, adjust the discharge temperature, reduce the requirements for the discharge collection end, and make the pry-mounted evaporation system capable of accepting the change of the feed liquid crystallization temperature within a certain range.

[0028] In addition, the separator is further provided with a heater for preheating the feed liquid in the separator, which facilitates heating of the feed liquid in the separator, reduces the circulation frequency of the feed liquid between the separators, and improves the overall feed liquid evaporation efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 Fig. 1 is a structure schematic view of a pry-mounted evaporation system of the utility model, which adopts a corresponding structure of an evaporator and a separator in connection;

[0030] Figure 2 Fig. 2 is a structure schematic view of a pry-mounted evaporation system of the utility model, which adopts a corresponding structure of an integrated evaporation and separation structure.

[0031] In the figure: separator 1, first circulating pump 2, water vapor compressor 3, evaporator 4, discharge pump 5, condensate tank 6, discharge waste heat preheater 7, condensate pump 8, water spraying pump 9, condensate waste heat preheater 10, cooling water tank 11, cooling water pump 12, integrated evaporation and separation structure 13, overflow tank 14, heater 15, second circulating pump 16, adjusting valve V1, fourth liquid level meter L4, second temperature sensor T2, third liquid level meter L3, first liquid level meter L1, first temperature sensor T1, second liquid level meter L2, discharge flow meter F1. DETAILED DESCRIPTION

[0032] In order to make the content of the utility model more easily be clearly understood, the following according to specific embodiment and combining with the drawings, the utility model is further explained in detail.

[0033] Please refer to Figure 1 And Figure 2 As shown in the embodiment, a pry-mounted evaporation system is provided, comprising: a feed preheating unit, an evaporation separation unit and a cooling unit.

[0034] Specifically, first, the feed preheating unit includes a cooling water tank 11 with heat exchange coil connected with the feed pipeline, and a preheater connected with the cooling water tank 11; the preheater includes a discharge waste heat preheater 7 and a condensate waste heat preheater 10. The cooling water tank 11 is provided with a fourth liquid level meter L4 and a second temperature sensor T2.

[0035] Here, the discharge waste heat preheater 7 can reuse the waste heat of the discharged feed liquid, and can also adjust the discharge temperature, reducing the requirements for the discharge collection end, so that the pry-mounted evaporation system can accept changes in the feed liquid crystallization temperature within a certain range.

[0036] An adjusting valve V1 is further arranged between the feed pipeline and the cooling water tank 11 to adjust the amount of feed entering the cooling water tank 11. The feed liquid first passes through the heat exchange coil of the cooling water tank 11 to reduce the temperature rise of the cooling water in the cooling water tank 11, reduce the discharge of the cooling water and preheat the feed liquid itself.

[0037] Secondly, the evaporation separation unit includes an evaporation separator connected with the discharge waste heat preheater 7 and the condensate waste heat preheater 10, a water vapor compressor 3 connected with the evaporation separator, and a condensate tank 6 connected with the water vapor compressor 3; the condensate tank 6 is connected with the condensate waste heat preheater 10 through a condensate pump 8, and the condensate in the condensate tank flows into the condensate waste heat preheater 10 as a heat source to preheat the feed liquid in the condensate waste heat preheater 10 for the second time, and the condensed water after heat exchange is discharged from the system to realize the recycling of heat. The condensate tank 6 is provided with a second liquid level meter L2.

[0038] In an optional embodiment, a shock absorber can be further arranged under the base of the water vapor compressor 3, and a soundproof cover is mounted around the water vapor compressor 3, and the soundproof cover is provided with a cooling fan.

[0039] The water vapor compressor 3 can be selected to adopt variable frequency starting or soft starting mode. The condensate in the condensate tank 6 can be supplemented into the cooling water tank 11 according to the liquid level of the cooling water tank 11 after the temperature is reduced by using the waste heat, so as to reduce the use amount of water resources outside the pry-mounted evaporation system.

[0040] Based on the above, in addition, in the first alternative embodiment, the evaporation separator adopts an integrated evaporation separation structure 13 having both a separation zone and an evaporation zone. In this regard, the evaporation separator is further connected with an overflow tank 14 through a second circulating pump 16; the overflow tank 14 is provided with a third liquid level meter L3. Here, according to the liquid level of the material liquid in the overflow tank 14 detected by the third liquid level meter L3, the frequency of the second circulating pump 16 is controlled according to the set liquid level.

[0041] In the second alternative embodiment, in detail in combination with the drawings, the evaporation separator includes a separator 1 and an evaporator 4 connected through a connecting pipe; the evaporator 4 adopts, for example but not limited to, a plate-type evaporator 4. The connecting pipe includes a first connecting pipe and a second connecting pipe which are independent of each other; the first connecting pipe is provided with a first circulating pump 2; a discharge waste heat preheater 7 and a condensate water waste heat preheater 10 are connected with the separator 1 respectively. The separator 1 is provided with a first liquid level meter L1 and a first temperature sensor T1. The evaporator 4 is further connected with a condensate water tank 6, and in an optional case, the evaporator 4 is further provided with a balance pipe between the evaporator 4 and the condensate water, which is beneficial to the outflow of the condensate water.

[0042] Based on the above structure, in addition, a discharge pipe is further provided between the discharge waste heat preheater 7 and the separator 1, and a discharge pump 5 is further provided on the discharge pipe; and a discharge flow meter F1 is further provided on the discharge pipe. Through the design of the discharge waste heat preheater 7, the waste heat of the discharged material liquid can be reused, and the discharge temperature can be adjusted, which reduces the requirements for the discharge collection end, so that the skid-mounted evaporation system can accept the change of the material liquid crystallization temperature within a certain range.

[0043] In addition, in an optional implementation, the separator 1 is further provided with a heater 15 for preheating the material liquid in the separator 1; it should be noted that the heater 15 is arranged at the bottom of the separator 1 or on the pipeline between the separator 1 and the first circulating pump 2.

[0044] On the basis of the above structure, it is necessary to note that a water injection pipe is further provided between the condensate water tank 6 and the water vapor compressor 3, and a water injection pump 9 suitable for pumping the condensate water in the condensate water tank 6 into the water vapor compressor 3 is further provided on the water injection pipe.

[0045] Finally, the cooling unit includes a pipeline arranged between the cooling water tank 11 and the water vapor compressor 3, and a cooling water pump 12 arranged on the pipeline.

[0046] In addition, it should be noted that the pry-mounted evaporation system of the embodiment is fixed on a frame, which at least includes door plates and sealing plates located on the outer layer and frame strips located in the interior. In order to reduce the noise of the overall system in operation, shock-absorbing rubber pads are laid on the bottom of the frame, reinforcing ribs are welded on the inner surfaces of the door plates and the sealing plates, and gasket pads are arranged between the door plates and the frame, and sound-absorbing materials are laid in the interiors of the door plates and the sealing plates.

[0047] It can be understood that the pry-mounted evaporation system of the embodiment further includes a controller connected with the first liquid level meter L1, the third liquid level meter L3, the third liquid level meter L3, the fourth liquid level meter L4, the first temperature sensor T1, the second temperature sensor T2, the regulating valve V1, the discharge flow meter and the heater 15. Specifically, the controller can be selected to use the mature means in the prior art to control the use states of the plurality of components. The control principle and mode of the embodiment are not improved, and the mature means can be used. The embodiment is not absolutely limited. Roughly, the controller can use the PID control technology, adopt the PLC control, and perform real-time monitoring and intelligent control on the parameters of each component in the operation of the device, so that the control of the pry-mounted evaporation system is more flexible, the working processes of the components are coordinated with each other, and the reliability of the operation of the pry-mounted evaporation system is improved.

[0048] Based on the above structure, the material liquid after gas-liquid separation is discharged by the discharge pump 5, enters the discharge preheater for heat exchange and is then discharged, and the steam enters the water vapor compressor 3. The water vapor compressor 3 increases the temperature and pressure of the steam, discharges the steam into the evaporator 4 for heat exchange, and the steam is condensed after heat release and flows into the condensate tank 6. Most of the water in the condensate tank 6 is discharged after heat exchange in the condensate preheater, and a small part is used for water vapor compression and lubrication to eliminate overheating. An external water source is supplemented into the cooling water tank 11 through the cooling water pump 12 for circulating cooling of the water vapor compressor 3. The material liquid in the heat exchange coil of the cooling water tank 11 is preheated while cooling the cooling water.

[0049] Based on the pry-mounted evaporation system, the corresponding operation method is as follows, including:

[0050] First, the preheating process: according to the liquid level in the separator 1 detected by the first liquid level meter L1, the amount of material entering the cooling water tank 11 through the feed pipe is adjusted by the regulating valve V1. After heat exchange of the material liquid in the cooling water tank 11, two routes of material liquid are formed. One route of material liquid enters the discharge waste heat preheater 7 for heat exchange, and the other route of material liquid enters the condensate waste heat preheater 10 for heat exchange.

[0051] Secondly, the evaporation separation process: here still combined with the drawings, for example, the evaporation separator is used separately in the case of the evaporator 4 and the separator 1. The two preheated liquid enters the evaporation separator, according to the first temperature sensor T1 detects the temperature of the liquid phase in the separator 1, according to the set temperature control heater 15 in the separator 1 of the liquid preheating, the liquid in the separator 1 by the first circulating pump 2 is transported to the evaporator 4 heat exchange after returning to the separator 1, start water vapor compressor 3, the liquid in the evaporation separator flash or with the liquid phase separation of secondary water vapor rising into the water vapor compressor 3, after the water vapor compressor 3 temperature rise into the evaporator 4 heating evaporation cycle liquid, secondary water vapor condensation into the condensate tank 6, according to the second liquid level meter L2 detection of the liquid level in the condensate tank 6, according to the set liquid level will condensate water discharge to the condensate water waste heat preheater 10; condensate water heat exchange after discharge or according to the fourth liquid level meter L4 detection of the liquid level of the cooling water tank 11, according to the set liquid level control condensate water to the cooling water tank 11, water pump 99 continuously spray into the water vapor compressor 3 for eliminating overheating and lubrication; according to the discharge flow meter detects the discharge flow, according to the set discharge flow will be concentrated in the separator 1 of the liquid continuously hit to the discharge waste heat preheater 7 after discharge;

[0052] Finally, the cooling process: the water in the cooling water tank 11 by the cooling water pump 12 into the water cavity of the water vapor compressor 3 heat exchange after returning to the cooling water tank 11, according to the second temperature sensor T2 detects the water temperature in the cooling water tank 11, according to the set temperature drainage water supplement.

[0053] In addition, for the pry dress type evaporation system, cleaning can be carried out by the following way:

[0054] Process one: about the separator-circulating pump-evaporator and discharge waste heat preheater cleaning

[0055] The cleaning solution of about 1m³ is prepared at 25-30℃, for example, but not limited to PO-63 cleaning agent, which is added to the storage tank connected with the feed pipeline (the storage tank volume is 0.2m³), and then is pumped into the separator 1 by the feed pump. After the cleaning solution is completely added, the storage tank is filled with water, and the feed pump is started to clean the cleaning solution in the pipeline. The first circulating pump 2 and the second circulating pump 16 are started to circulate and clean. The discharge port of the discharge waste heat preheater 7 is connected to the sampling detection port through a tee joint, and the other port is connected to the standby port of the separator 1 through a hose. The discharge pump 5 is started to circulate and clean. After cleaning, the residual cleaning solution is discharged through the discharge pipeline by opening the corresponding blowdown valve. Here, a set of bucket and metering pump for adding scale inhibitor can be arranged at the position of the storage tank. According to the feed speed of 2000L / h, the metering pump is set to supplement the scale inhibitor to the storage tank according to the requirement of the scale inhibitor.

[0056] Process two: about the cleaning of the feed pipeline

[0057] If only water is planned to be used for cleaning, water is added to the storage tank, and is pumped into the separator by the feed pump, the blowdown valve of the separator 1 is opened throughout, until the water out of the blowdown port is as clear as the water in.

[0058] Process three: about the compressor-evaporator-condensate tank-condenser pipeline water spray pipeline cleaning:

[0059] If cleaning with scale remover is planned, cleaning liquid is added to the condensate tank 6, and is circulated by the water spray pump 9, the condensate discharge port hose is connected back to the condensate tank 6 standby port, and is circulated by the condensate pump 8, and the cleaning method is the same as process one.

[0060] Process four: cleaning of the compressor cooling circulation system:

[0061] If only water is planned to be used for cleaning, water is added to the storage tank connected with the feed pipeline, and is circulated by the cooling water pump 12, the drain valve is opened throughout, until the backwater is as clear as the water in.

[0062] If cleaning with scale remover is planned, the process is executed at the same time as process one, cleaning liquid is added to the water storage tank, the cooling water pump 12 is opened for circulation, and if the cleaning liquid is insufficient, it is continuously supplemented.

[0063] Process five: cleaning of the blowdown pipeline:

[0064] The process is executed at the same time as process one and process two, the total blowdown port valve of the whole device is closed, the evaporator 4 and the separator 1 blowdown valve are opened, and the blowdown valves of other equipment are closed, so that the cleaning liquid fills the blowdown pipeline during the cleaning process, and is discharged with water for cleaning in the following process one.

[0065] The above specific embodiments further illustrate the purpose, technical scheme and beneficial effects of the utility model, and it should be understood that the above is only a specific embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

[0066] In the description of the utility model, it should be understood that the terms indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0067] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and so on terms should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated; can be mechanical connection, also can be electrical connection; can be direct connection, also can indirectly connect through intermediate medium, can be two element internal communication or two element mutual action relation. For ordinary skilled person in the art, can understand the concrete meaning of above-mentioned terms in the utility model according to specific circumstances.

[0068] In the utility model, unless another definite provision and limitation, first feature is on or under second feature can include that first and second features are directly contacted, also can include that first and second features are not directly contacted but are contacted through additional feature between them. Moreover, first feature is on, above and on top of second feature includes that first feature is directly above and obliquely above second feature, or just indicates that the horizontal height of first feature is higher than second feature. First feature is under, below and under second feature includes that first feature is directly below and obliquely below second feature, or just indicates that the horizontal height of first feature is less than second feature.

Claims

1. A skid-mounted evaporation system, characterized in that The application relates to a feed preheating unit, an evaporation separation unit and a cooling unit. The feed preheating unit comprises a cooling water tank with heat exchange coils connected with a feed pipeline, and a preheater connected with the cooling water tank; the preheater comprises a discharge waste heat preheater and a condensate waste heat preheater; The evaporation separation unit comprises an evaporation separator connected with the discharge waste heat preheater and the condensate waste heat preheater, a water vapor compressor connected with the evaporation separator, and a condensate water tank connected with the water vapor compressor; the condensate water tank is connected with the condensate waste heat preheater through a condensate pump; The cooling unit comprises a pipeline arranged between the cooling water tank and the water vapor compressor, and a cooling water pump arranged on the pipeline.

2. The skid-mounted evaporation system of claim 1, wherein, The evaporation separator adopts an integrated evaporation separation structure with a separation zone and an evaporation zone.

3. The skid-mounted evaporation system of claim 2, wherein, The evaporation separator is further connected with an overflow tank. The overflow tank is provided with a third liquid level meter.

4. The skid-mounted evaporation system of claim 1, wherein, The evaporation separator comprises a separator and an evaporator connected through a connecting pipe; wherein The connecting pipe comprises a first connecting pipe and a second connecting pipe which are independent of each other; the first connecting pipe is provided with a first circulating pump; The discharge waste heat preheater and the condensate waste heat preheater are respectively connected with the separator.

5. The skid-mounted evaporation system of claim 4, wherein, The evaporator is further connected with the condensate water tank.

6. The skid-mounted evaporation system of claim 4, wherein, The separator is provided with a first liquid level meter and a first temperature sensor.

7. A skid-mounted evaporation system according to any of claims 4-6, characterized in that The separator is further provided with a heater for preheating the liquid in the separator; The heater is arranged at the bottom of the separator or on the pipeline between the separator and the first circulating pump.

8. The skid-mounted evaporation system of claim 4, wherein, A discharge pipeline is further arranged between the discharge waste heat preheater and the separator, and a discharge pump is arranged on the discharge pipeline; and A discharge flow meter is further arranged on the discharge pipeline.

9. The skid-mounted evaporation system of claim 1, wherein, A water injection pipeline is further arranged between the condensate water tank and the water vapor compressor, and a water injection pump suitable for pumping the condensate in the condensate water tank into the water vapor compressor is arranged on the water injection pipeline.

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