CN215876263U

CN215876263U - Evaporator

Info

Publication number: CN215876263U
Application number: CN202122168904.3U
Authority: CN
Inventors: 陈朝宇; 吴燕鹏; 刘翔
Original assignee: Guangzhou My Source Technology Co ltd
Current assignee: Guangzhou My Source Technology Co ltd
Priority date: 2021-09-08
Filing date: 2021-09-08
Publication date: 2022-02-22
Anticipated expiration: 2031-09-08

Abstract

An evaporator comprises a frame, a control unit, a preheater, a heater, a gas-liquid separator, a circulating pump, a steam compressor and a steam generator, wherein the preheater, the heater, the gas-liquid separator, the circulating pump, the steam compressor and the steam generator are connected through pipelines; the preheater, the heater, the gas-liquid separator, the circulating pump and the steam compressor are arranged on the frame in a stacking manner and are electrically connected with the control unit; the preheater, the heater and the gas-liquid separator are sequentially connected; the circulating pump is connected between the liquid outlet of the gas-liquid separator and the heater; the steam compressor is connected between the gas-liquid separator gas outlet and the heater; the steam generator is coupled to the gas-liquid separator and provides steam thereto. Compared with the prior art, the evaporator has the advantages of short preheating time, high efficiency, high steam generation efficiency and evaporation capacity, stable operation and compact structure.

Description

Evaporator

Technical Field

The utility model relates to the technical field of vapor mechanical recompression, in particular to an evaporator.

Background

The MVR is a short name of a mechanical vapor recompression (mechanical vapor compression) technology, and is an energy-saving technology which utilizes the energy of secondary vapor generated by the MVR so as to reduce the requirement on external energy. In the working process, low-temperature steam is compressed by a compressor in an evaporator, the temperature and the pressure are improved, the enthalpy is increased, and then the high-temperature steam enters a heat exchanger for condensation, so that the latent heat of the steam is fully utilized. The MVR technology is mainly applied to evaporation concentration materials and evaporation crystallization materials, and has the advantage of energy conservation compared with the traditional multi-effect evaporation.

However, the liquid material with complex components generally needs to be evaporated in the MVR technology, so that the required process is complex, the operation is complex, and the MVR evaporator in the prior art generally has a huge structure and a wide occupied area. And it takes a certain time to heat to reach the gas-liquid separation temperature, resulting in low efficiency.

SUMMERY OF THE UTILITY MODEL

Based on this, the present invention provides an evaporator, which improves efficiency based on the MVR technology.

The utility model is realized by the following technical scheme:

an evaporator comprises a frame, a control unit, a preheater, a heater, a gas-liquid separator, a circulating pump, a steam compressor and a steam generator, wherein the preheater, the heater, the gas-liquid separator, the circulating pump, the steam compressor and the steam generator are connected through pipelines; the preheater, the heater, the gas-liquid separator, the circulating pump and the steam compressor are arranged on the frame in a stacking manner and are electrically connected with the control unit; the preheater, the heater and the gas-liquid separator are sequentially connected; the circulating pump is connected between the liquid outlet of the gas-liquid separator and the heater; the steam compressor is connected between the gas-liquid separator gas outlet and the heater; the steam generator is coupled to the gas-liquid separator and provides steam thereto.

Compared with the prior art, the evaporator can provide enough heat for the gas-liquid separator through the steam generator when the temperature in the equipment is lower, so that the preheating time is shortened, the efficiency is improved, the preheater is arranged, the steam generation efficiency and the evaporation capacity are improved, and the compact structure of the evaporator reduces the occupied space of the equipment. In addition, the heater is connected with a circulating pump, so that the flow rate of liquid in the heater is improved, and simultaneously, the generated turbulence can reduce scaling and ensure long-term stable operation of equipment.

Further, the device also comprises a condensed water tank and a condensed water pump; the condensed water tank is connected with the heater and stores condensed water generated by the heater; the condensate pump is connected between the condensate water tank and the preheater, and the condensate water is recycled or discharged.

Further, the device also comprises a spray head; the spray head is positioned at the gas outlet of the gas-liquid separator and connected with the condensate pump to spray water mist to the gas outlet, so that the temperature of steam entering the steam compressor is reduced, and the steam compressor is protected.

Furthermore, the circulating pump with vapor compressor's input is connected with the motor through elastic coupling respectively, when improving transmission efficiency, reduces noise and frictional force, increase of service life, and it is convenient to maintain.

Further, the heater, the gas-liquid separator and the steam compressor are wrapped with heat insulation cotton to insulate heat and separate the heater, the gas-liquid separator and the steam compressor, so that mutual interference of heat energy during working is prevented.

Further, the preheater is a shell and tube or plate heat exchanger; the heater is a plate heat exchanger to improve heat exchange efficiency.

Furthermore, the vapor compressor is a roots vapor compressor or a screw compressor, so that the volume of the equipment is reduced, and the compression efficiency is improved.

Further, the salt leg cylinder is connected with the liquid outlet of the gas-liquid separator and is provided with a first outlet and a second outlet which can be opened and closed; first exit linkage the circulating pump, just the second export is located salt leg barrel bottom for the lower liquid flow direction circulating pump of salinity content, the higher liquid outflow system of salinity content, thereby reduce the scale deposit.

Further, the device also comprises a discharge pump; the inlet of the discharging pump is connected with the second outlet, and the outlet of the discharging pump is respectively communicated with the salt leg cylinder and the discharging port through a three-way valve, so that liquid with high salt content can flow out of a system or circularly flow, and scaling is further reduced.

Further, a mechanical seal is arranged in the circulating pump and/or the discharging pump; also includes a cooling system; the cooling system cools the mechanical seal, and the sealing performance is improved.

Further, the cooling system comprises a water pump, a water heat exchanger and a water tank which are sequentially connected through pipelines and form a loop; the mechanical seal is provided with an inlet and an outlet, the water heat exchanger is connected with the inlet of the mechanical seal, and the water tank is connected with the outlet of the mechanical seal to be cooled by introducing cooling water, so that the sealing property is further improved.

Furthermore, the water pump, the water heat exchanger and the inlet and outlet of the water tank all adopt shaft seals to ensure the sealing performance.

Further, the frame is of a 3-layer structure from bottom to top; the preheater is positioned at one side of the lowest layer, and the heater is positioned at the other side and is arranged at the middle layer; the gas-liquid separator is arranged on the uppermost layer and extends to the lowermost layer; the salt leg cylinder is connected below the gas-liquid separator; the steam compressor is positioned at the uppermost layer; the circulating pump is positioned at the lowest layer and is right below the heater; the condensed water tank is positioned below the gas-liquid separator; the condensate pump is positioned at the lowest layer; the water pump and the water tank are both positioned at the lowest layer of the frame, and the water heat exchanger is positioned at the middle layer of the frame; the discharge pump is arranged at the lowest layer of the frame; the control unit is located at the lowermost layer and at the same side as the heater, thereby enabling a compact structure.

For a better understanding and practice, the utility model is described in detail below with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic view showing the overall construction of an evaporator according to the present invention;

FIG. 2 is an overall perspective view of the evaporator of the present invention in one projection direction;

FIG. 3 is an overall perspective view of the evaporator according to the present invention in another projection direction;

FIG. 4 is a schematic view of the arrangement of the circulation pump, the salt leg barrel and the discharge pump of the present invention;

FIG. 5 is a schematic view of the cooling system of the present invention;

fig. 6 is a partial cross-sectional view of a circulation pump in one embodiment of the utility model.

Detailed Description

Specifically, referring to fig. 1 to 3, the evaporator of the present invention includes a preheater 10, a heater 20, a gas-liquid separator 30, a circulation pump 40, a vapor compressor 50, a frame 60, and a control unit 70 connected by pipes (not labeled). Liquid material enters the preheater 10 from the inlet of the preheater 10 for preheating. The outlet of the preheater 10 is connected to the inlet of the heater 20. An outlet of the heater 20 is connected to an inlet of the gas-liquid separator 30, and the preheated liquid material is heated in the heater 20 and enters the gas-liquid separator 30 for gas-liquid separation. The gas-liquid separator 30 is provided with a gas outlet (not shown) and a liquid outlet (not shown). The gas outlet is connected to the inlet of the vapor compressor 50, and the compressed high-temperature and high-pressure gas reenters the heater 20 from the outlet of the vapor compressor 50 to be heated, so as to supply secondary steam to the heater 20. The liquid outlet is connected to the inlet of the circulation pump 40. The high temperature liquid re-enters the heater 20 from the outlet of the circulation pump 40. The circulation pump 40 increases the flow rate of the liquid material in the heater 20 and forms turbulent flow, thereby reducing the possibility of scaling in the heater 20 and ensuring long-term stable operation. Under the action of the circulating pump 40, the liquid material is circulated into the heater 20 and the gas-liquid separator 30 for multiple times, and the concentration is gradually increased under the action of evaporation. When the liquid material becomes a concentrated solution of a desired concentration, a pipe connected between the heater 20 and the circulation pump 40 is opened to discharge the concentrated solution. The frame 60 supports the preheater 10, the heater 20, the gas-liquid separator 30, the circulation pump 40, and the steam compressor 50, respectively. The control unit 70 is electrically connected to the preheater 10, the heater 20, the gas-liquid separator 30, the circulation pump 40, and the vapor compressor 50, respectively, to control the on/off thereof.

Further, a condensed water tank 80 and a condensed water pump 90 are included. The condensed water tank 80 is connected to the heater 20. The condensed water generated when the secondary steam is cooled by the heater 20 flows into the condensed water tank 80. The condensate pump 90 is connected between the condensate tank 80 and the pre-heater 20 and electrically connected to the control unit 70, and condensate flows from the condensate tank 80 into the pre-heater 20 for reheating or is discharged from the pre-heater 20 to the outside of the evaporator by the condensate pump 90. Further, a spray head 100 is also included. The showerhead 100 is located at the gas outlet and connected to the condensate pump 90. When the temperature of the vapor compressor 50 is too high, the condensed water flows to the spray head 100 under the action of the condensed water pump 90, and water mist is generated for spraying, so that the temperature of the vapor entering the vapor compressor 50 is reduced, and the vapor compressor 50 is protected.

Further, a steam generator 110 is also included. The steam generator 110 is connected to the gas-liquid separator 30. When the evaporator is just started, the temperature in the device is low, and the steam generator 110 provides steam for heating the gas-liquid separator 30, so that the preheating time is shortened, and the efficiency is improved.

Further, the input ends of the circulation pump 40 and the vapor compressor 50 are respectively connected to a motor driving them to operate through an elastic coupling (not shown), so that the transmission efficiency is improved, and simultaneously, the noise and the friction force are reduced, thereby prolonging the service life and facilitating the maintenance.

Further, please refer to fig. 4, which also includes a salt leg cylinder 120. The salt leg cylinder 120 is connected to the liquid outlet of the gas-liquid separator 30 and has a first outlet 121 connected to the circulation pump 40 and a switchable second outlet 122. The first outlet 121 is located above the second outlet 122. Preferably, the second outlet 122 is located at the bottom of the salt leg barrel 120. The crystallized salt in the solid-liquid mixture discharged from the gas-liquid separator 30 is deposited at the bottom of the salt leg cylinder 120 under the action of gravity, and the solid-liquid mixture with higher salt concentration is discharged by opening the second outlet 122. And the solid-liquid mixture with higher salt concentration is discharged from the first outlet 121 to the circulation pump 40, thereby reducing the scaling of the circulation pump 40. Further, a discharge pump 130 is also included. The inlet of the discharging pump 130 is connected with the second outlet 122, the outlet of the discharging pump is respectively connected with the salt leg cylinder 120 and the discharging port 131 through a three-way valve, a normally open first valve 132 is arranged between the salt leg cylinder 120 and the outlet of the discharging pump 130, and a second valve 133 is arranged between the discharging port 131 and the outlet of the discharging pump 130. The second valve 133 is closed, and the solid-liquid mixture with higher salt concentration extracted from the salt leg barrel 120 by the discharge pump 130 flows back into the salt leg barrel 120 again, so that the liquid in the salt leg barrel 120 keeps flowing state without causing blockage. The second valve 133 is opened, and the discharge pump 130 discharges the solid-liquid mixture with higher salt concentration extracted from the salt leg cylinder 120 to the outside of the equipment, thereby realizing stable discharge.

Further, referring to fig. 5 and fig. 6, a cooling system 140 is further included, and a mechanical seal is disposed between the circulation pump 40 and the discharge pump 130. The cooling system 140 provides cooling water to the mechanical seal between the circulating pump 40 and the discharging pump 130 for cooling to ensure the sealing effect, and reduce the outflow of solid-liquid mixture in the circulating pump 40 and the discharging pump 130 due to poor sealing, which causes pollution and corrosion to the equipment. Further, referring to fig. 5, the cooling system 140 includes a water pump 141, a water heat exchanger 142 and a water tank 143 that are connected in sequence through pipes and form a loop, and preferably, the inlets and outlets of the water pump 141, the water heat exchanger 142 and the water tank 143 are shaft-sealed to ensure the sealing performance. The mechanical seal is provided with a communicated inlet and outlet. The water pump 141 is connected between the water tank 143 and the water heat exchanger 142. The outlet of the water heat exchanger 142 is connected to the mechanical seal inlet, and the outlet of the mechanical seal is connected to the water tank 143. The water pump 141 draws cooling water having a relatively low temperature from the water tank 143 and flows the cooling water into the water heat exchanger 142, and then the cooling water flows into the mechanical seal to be cooled, thereby further improving the sealing performance. Further, the water tank 143 is provided with an exhaust port 1431 to prevent thermal expansion and contraction caused by heat exchange. In one embodiment, as shown in fig. 6, taking the circulation pump 40 as an example, which is a pump body manufactured by the hangzhou alkali pump limited and having a model AZ100-80-160, the mechanical seal 41 is located inside the pump body and is disposed near the inlet/outlet 42 of the pump body for sealing, the mechanical seal 41 is provided with a freezing structure 43 for communicating the inside and the outside of the pump body, and the water heat exchanger 14 and the water tank 143 are respectively connected to the inlet and the outlet of the freezing structure 43, so that the cooling system 140 can feed cooling water into the pump body through the freezing structure 43 and circulate and discharge the cooling water for cooling, and the pump body is provided with the mechanical seal having the freezing structure, which is not described in detail herein.

In the present embodiment, the frame 60 is divided into 3 layers from the bottom up. The preheater 10 is a shell and tube or plate heat exchanger and is located on the right side of the lowest layer of the frame 60. The heater 20 is a plate heat exchanger and is located on the left side of the middle layer of the frame 60. The gas-liquid separator 30 is fixed to the uppermost layer of the frame 60 and extends to the lowermost layer of the frame 60. The vapor compressor 50 is a roots vapor compressor or a screw compressor and is installed at the uppermost layer of the frame 60. The circulation pump 40 is located at the lowermost layer of the frame 60 and directly below the heater 20. The condensed water tank 80 is located below the gas-liquid separator 30. The salt leg cylinder 120 is integrally connected to the gas-liquid separator 30. The condensate pump 90 is located at the lowermost layer of the frame 60. The control unit 70 is installed at the left side of the lowermost layer of the frame 60. The water pump 141 and the water tank 143 are both located at the lowest layer of the frame 60, and the water heat exchanger 142 is located at the middle layer of the frame 60. The discharge pump 130 is mounted to the lowermost layer of the frame 60. The preheater 10, the heater 20, the gas-liquid separator 30, the circulation pump 40, the vapor compressor 50, the condensed water tank 80, the condensed water pump 90, the discharge pump 130 and the cooling system 140 are stacked on the frame 60 and connected by pipes, so that the evaporator has a compact structure and occupies a small space.

Preferably, the heater 20, the gas-liquid separator 30 and the steam compressor 50 are wrapped with heat insulation cotton to insulate and separate the heater, the gas-liquid separator 30 and the steam compressor from each other, so as to prevent heat interference during operation.

Compared with the prior art, the evaporator disclosed by the utility model is compact in structure, high in steam generation efficiency and evaporation capacity, less in scaling condition and stable in operation. Even when the operation is started and the internal temperature of the equipment is low, the temperature is still enough to operate, the efficiency is high, and the operation of the heater, the gas-liquid separator and the steam compressor is not influenced mutually. Can retrieve comdenstion water and concentrate, can utilize the comdenstion water to cool down, when protecting equipment, make full use of liquid material. In addition, the device has the advantages of low noise and friction during operation, less scaling, high sealing performance, low energy consumption, long service life and convenient maintenance.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.

Claims

1. An evaporator, characterized by: comprises a frame, a control unit, a preheater, a heater, a gas-liquid separator, a circulating pump, a steam compressor and a steam generator which are connected by pipelines; the preheater, the heater, the gas-liquid separator, the circulating pump and the steam compressor are arranged on the frame in a stacking manner and are electrically connected with the control unit; the preheater, the heater and the gas-liquid separator are sequentially connected; the circulating pump is connected between the liquid outlet of the gas-liquid separator and the heater; the steam compressor is connected between the gas-liquid separator gas outlet and the heater; the steam generator is coupled to the gas-liquid separator and provides steam thereto.

2. An evaporator according to claim 1 wherein: the device also comprises a condensed water tank and a condensed water pump; the condensed water tank is connected with the heater and stores condensed water generated by the heater; the condensate pump is connected between the condensate water tank and the preheater.

3. An evaporator according to claim 2 wherein: also comprises a spray head; the spray head is positioned at the gas outlet of the gas-liquid separator and is connected with the condensate pump so as to spray water mist to the gas outlet.

4. An evaporator according to claim 1 wherein: the circulating pump and the input end of the steam compressor are respectively connected with the motor through an elastic coupling.

5. An evaporator according to claim 1 wherein: the heater, the gas-liquid separator and the steam compressor are wrapped by heat insulation cotton.

6. An evaporator according to claim 1 wherein: the preheater is a shell and tube or plate heat exchanger; the heater is a plate heat exchanger.

7. An evaporator according to claim 1 wherein: the vapor compressor is a Roots vapor compressor or a screw compressor.

8. An evaporator according to claim 2 wherein: also comprises a salt leg cylinder body; the salt leg cylinder is connected with the liquid outlet of the gas-liquid separator and is provided with a first outlet and a second outlet which can be opened and closed; the first outlet is connected with the circulating pump, and the second outlet is positioned at the bottom of the salt leg cylinder.

9. An evaporator according to claim 8 wherein: the device also comprises a discharge pump; and the inlet of the discharging pump is connected with the second outlet, and the outlet of the discharging pump is respectively communicated with the salt leg cylinder and the discharging hole through a three-way valve.

10. An evaporator according to claim 9 wherein: a mechanical seal is arranged in the circulating pump and/or the discharging pump; also includes a cooling system; the cooling system cools the mechanical seal.

11. An evaporator according to claim 10 wherein: the cooling system comprises a water pump, a water heat exchanger and a water tank which are sequentially connected through pipelines and form a loop; the mechanical seal is provided with an inlet and an outlet, the water heat exchanger is connected with the inlet of the mechanical seal, and the water tank is connected with the outlet of the mechanical seal to be cooled by introducing cooling water.

12. An evaporator according to claim 11 wherein: and the water pump, the water heat exchanger and the inlet and outlet of the water tank are all provided with shaft seals.

13. An evaporator according to claim 11 wherein: the frame is of a 3-layer structure from bottom to top; the preheater is positioned at one side of the lowest layer, and the heater is positioned at the other side and is arranged at the middle layer; the gas-liquid separator is arranged on the uppermost layer and extends to the lowermost layer; the salt leg cylinder is connected below the gas-liquid separator; the steam compressor is positioned at the uppermost layer; the circulating pump is positioned at the lowest layer and is right below the heater; the condensed water tank is positioned below the gas-liquid separator; the condensate pump is positioned at the lowest layer; the water pump and the water tank are both positioned at the lowest layer of the frame, and the water heat exchanger is positioned at the middle layer of the frame; the discharge pump is arranged at the lowest layer of the frame; the control unit is positioned at the lowest layer and is positioned at the same side of the heater.