CN217613031U

CN217613031U - Salt solution evaporation crystallization system driven by high-temperature heat pump

Info

Publication number: CN217613031U
Application number: CN202221946093.3U
Authority: CN
Inventors: 张承虎; 师熙隆; 朱添奇; 武剑锋
Original assignee: Harbin Institute of Technology
Current assignee: Harbin Institute of Technology
Priority date: 2022-07-27
Filing date: 2022-07-27
Publication date: 2022-10-21
Anticipated expiration: 2032-07-27

Abstract

The utility model provides a salt solution evaporation crystal system of high temperature heat pump drive belongs to evaporation crystal system technical field. The problems that an existing steam mechanical compression system cannot meet the requirements of low-vacuum low-temperature evaporation crystallization, efficiency is low, and energy consumption is high are solved. The system comprises a crystallizer, a salt separator, a raw liquid tank, a crystal pump, a heat pump condenser, a heat pump evaporator, a water collecting tank, a heat pump compressor, a first heat pump throttling expansion device, a circulating pump, a drainage pump, a vacuum pump, a first regulating valve, a second regulating valve, a check valve and a pressure reducing valve. The high-temperature heat pump is used for replacing a vapor compressor in the MVR technology, under the condition of small amount of steam auxiliary starting, condensation heat is used for replacing a conventional crystallization heat source, meanwhile, cyclic utilization of secondary steam heat is achieved, energy consumption is reduced, energy utilization efficiency is improved, and the salt solution evaporation crystallization system driven by the high-temperature heat pump greatly reduces the usage amount of raw steam in the crystallization process and has important practical significance.

Description

Salt solution evaporation crystallization system driven by high-temperature heat pump

Technical Field

The utility model relates to an evaporation crystal system technical field particularly, relates to a salt solution evaporation crystal system of high temperature heat pump drive.

Background

The conventional evaporative crystallization system means that after a raw material liquid enters an evaporative crystallizer, the raw material liquid is heated by a heater through pressure shock drop to reach a solution bubble point, so that the raw material liquid is violently boiled in a clean room to generate secondary steam. Because the solvent is continuously lost, the supersaturation degree of the solution in the crystallization chamber is increased, and the primary and secondary nucleation processes are continuously carried out under the promotion action of the seed crystal to gradually generate product crystals. In the conventional evaporative crystallization system, the pressure and the taste of water vapor flashed from the crystallization chamber are low, so that the water vapor is mostly directly discharged to the atmosphere or condensed by a cooling system, pollution and energy waste are caused, and the main factor of the production cost of raw steam as a heat source is the coal price.

The Mechanical Vapor compression (MVR) technology uses a compressor to compress low-temperature secondary Vapor, so as to realize conversion of electric energy to heat energy, further improve the temperature, pressure and enthalpy of the Vapor, the Vapor enters a heating chamber of a crystallizer again, heat is provided for the crystallizer through heat exchange, and the Vapor is condensed to release heat to form condensate. The technology greatly improves the heat efficiency while recovering the latent heat of the secondary steam, but the MVR technology is more suitable for the evaporation concentration field of low boiling point temperature rise with the evaporation temperature of more than 90 ℃ and the saturation temperature rise of no more than 10-15 ℃ after compression. And as the core component, the water vapor compressor has high raw material price and harsh manufacturing conditions. Therefore, aiming at the field of low-temperature vacuum evaporation crystallization with materials as heat-sensitive substances and evaporation temperature of 45-90 ℃, a new technology with high matching degree and remarkable energy-saving effect in the industry needs to be researched and developed.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is:

the problems that an existing steam mechanical compression system cannot meet the requirements of low-vacuum low-temperature evaporation crystallization, efficiency is low, and energy consumption is high are solved.

The utility model discloses a solve the technical scheme that above-mentioned technical problem adopted:

scheme one, the utility model provides a salt solution evaporation crystallization system driven by a high-temperature heat pump, which comprises a crystallizer, a salt separator, a raw liquid tank, a crystal pump, a heat pump condenser, a heat pump evaporator, a water collecting tank, a heat pump compressor, a first heat pump throttling expansion device, a circulating pump, a draining pump, a vacuum pump, a first regulating valve, a second regulating valve, a check valve, a pressure reducing valve, a first live steam pipeline, a first secondary steam pipeline, a second secondary steam pipeline, a heat pump condensed water pipeline, a vacuumizing pipeline, a water collecting tank drainage pipeline, a first heat pump working medium gaseous pipeline, a second heat pump working medium gaseous pipeline, a first heat pump working medium liquid pipeline, a second heat pump working medium liquid pipeline, a first salt solution pipeline, a second salt solution pipeline, a third salt solution pipeline, a fourth salt solution pipeline, a fifth salt solution pipeline, a sixth salt solution pipeline, a crystallization pipeline, a salt outlet pipeline, a liquid outlet pipeline and a liquid inlet pipeline,

the steam outlet of the crystallizer is connected with the steam inlet of a first secondary steam pipeline, the steam outlet of the first secondary steam pipeline is connected with the steam inlet of a second secondary steam pipeline after being converged with the steam outlet of a first raw steam pipeline, a first regulating valve is arranged on the first secondary steam pipeline, a pressure reducing valve is arranged on the first raw steam pipeline, the steam outlet of the second secondary steam pipeline is connected with the steam inlet of a heat pump evaporator,

the condensed water outlet of the heat pump evaporator is connected with the liquid inlet of the condensed water pipeline of the heat pump, the liquid outlet of the condensed water pipeline of the heat pump is connected with the liquid inlet of the water collecting tank, the steam outlet of the water collecting tank is connected with the steam inlet of the vacuumizing pipeline, the vacuumizing pipeline is sequentially provided with a second regulating valve and a vacuum pump along the flow direction of water vapor, the liquid outlet of the water collecting tank is connected with the liquid inlet of the water discharging pipeline of the water collecting tank, the water discharging pipeline of the water collecting tank is sequentially provided with a water discharging pump and a check valve along the flow direction of liquid water,

the outlet of the heat pump compressor is connected with the inlet of a second heat pump working medium gas pipeline, the outlet of the second heat pump working medium gas pipeline is connected with the inlet of a heat pump condenser, the liquid outlet of the heat pump condenser is connected with the liquid inlet of a first heat pump working medium liquid pipeline, the liquid outlet of the first heat pump working medium liquid pipeline is connected with the liquid inlet of a first heat pump throttling expansion device, the liquid outlet of the first heat pump throttling expansion device is connected with the liquid inlet of a second heat pump working medium liquid pipeline, the liquid outlet of the second heat pump working medium liquid pipeline is connected with the liquid inlet of a heat pump evaporator, the outlet of the heat pump evaporator is connected with the inlet of the first heat pump working medium gas pipeline, the outlet of the first heat pump working medium gas pipeline is connected with the inlet of the heat pump compressor,

the liquid outlet of the crystallizer is connected with the liquid inlet of the first salt solution pipeline, the liquid outlet of the first salt solution pipeline is connected with the heat medium inlet end of the heat pump condenser, the heat medium outlet end of the heat pump condenser is connected with the liquid inlet of the second salt solution pipeline, a circulating pump is arranged on the first salt solution pipeline, the liquid outlet of the second salt solution pipeline is connected with the liquid inlet of the third salt solution pipeline after being converged with the liquid outlet of the fifth salt solution pipeline, the liquid outlet of the third salt solution pipeline is respectively connected with the liquid inlet of the fourth salt solution pipeline and the liquid inlet of the sixth salt solution pipeline, the liquid outlet of the fourth salt solution pipeline is connected with the liquid inlet of the crystallizer, the liquid outlet of the crystallizer is connected with the bottom of the crystallizer, the discharge port of the crystallizer is connected with the feed inlet of the crystallization pipeline, the discharge port of the crystallization pipeline is connected with the feed inlet of the salt separator, a crystal pump is arranged on the crystallization pipeline, the discharge port of the salt separator is connected with the feed inlet of the salt pipeline, the liquid outlet of the salt separator is connected with the liquid inlet of the liquid tank, the liquid inlet of the salt separator is connected with the liquid inlet of the liquid tank of the liquid outlet of the fifth salt solution pipeline.

Further comprises a second heat pump throttling expansion device, an economizer, a third heat pump working medium liquid pipeline, a fourth heat pump working medium liquid pipeline, a fifth heat pump working medium liquid pipeline, a sixth heat pump working medium liquid pipeline and an economizer return pipeline,

the liquid outlet of the heat pump condenser is connected with the liquid inlet of a sixth heat pump working medium liquid pipeline, the liquid outlet of the sixth heat pump working medium liquid pipeline is respectively connected with the liquid inlet of a fourth heat pump working medium liquid pipeline and the liquid inlet of a first heat pump working medium liquid pipeline, the liquid outlet of the fourth heat pump working medium liquid pipeline is connected with the liquid inlet of a second heat pump throttling expansion device, the liquid outlet of the second heat pump throttling expansion device is connected with the liquid inlet of a fifth heat pump working medium liquid pipeline, the liquid outlet of the fifth heat pump working medium liquid pipeline is connected with the liquid inlet of an economizer, the liquid outlet of the economizer is connected with the liquid inlet of an economizer return pipeline, and the liquid outlet of the economizer return pipeline is connected with the liquid inlet of a heat pump compressor,

the liquid outlet of the first heat pump working medium liquid pipeline is connected with the liquid inlet of the economizer, the liquid outlet of the economizer is connected with the liquid inlet of the third heat pump working medium liquid pipeline, and the liquid outlet of the third heat pump working medium liquid pipeline is connected with the liquid inlet of the first heat pump throttling expansion device.

Furthermore, the device also comprises an eleventh salt solution pipeline, wherein a liquid outlet of the salt separator is connected with a liquid inlet of the eleventh salt solution pipeline, and a liquid outlet of the eleventh salt solution pipeline is connected with a liquid inlet of the raw liquid tank.

The crystallizer comprises a crystallizer body, a salt solution separator, a seventh salt solution pipeline and an eighth salt solution pipeline, wherein the liquid outlet of the salt separator is connected with the liquid inlet of the seventh salt solution pipeline, the liquid outlet of the sixth salt solution pipeline and the liquid outlet of the seventh salt solution pipeline are converged and then connected with the liquid inlet of the eighth salt solution pipeline, and the liquid outlet of the eighth salt solution pipeline is connected with the bottom of the crystallizer.

The heat pump condenser further comprises a ninth salt solution pipeline and a twelfth salt solution pipeline, wherein a liquid outlet of the salt separator is connected with a liquid inlet of the twelfth salt solution pipeline, a liquid outlet of the twelfth salt solution pipeline is connected with a liquid inlet of the ninth salt solution pipeline after being converged with a liquid outlet of the first salt solution pipeline, and a liquid outlet of the ninth salt solution pipeline is connected with a heat medium inlet end of the heat pump condenser.

Scheme two, a salt solution evaporation crystallization system driven by a high-temperature heat pump, which comprises a crystallizer, a salt separator, a raw solution tank, a crystal pump, a heat pump condenser, a heat pump evaporator, a water collecting tank, a heat pump compressor, a first heat pump throttling expansion device, a steam-salt solution heat exchange device, a circulating pump, a draining pump, a vacuum pump, a first regulating valve, a second regulating valve, a check valve, a first secondary steam pipeline, a heat pump condensation water pipeline, a vacuumizing pipeline, a water collecting tank draining pipeline, a second raw steam pipeline, a third raw steam pipeline, a first heat pump working medium gaseous pipeline, a second heat pump working medium gaseous pipeline, a first heat pump working medium liquid pipeline, a second heat pump working medium liquid pipeline, a first salt solution pipeline, a second salt solution pipeline, a third salt solution pipeline, a fourth salt solution pipeline, a fifth salt solution pipeline, a sixth salt solution pipeline, a crystallization pipeline, a tenth salt solution pipeline, a liquid outlet pipeline and a liquid inlet pipeline,

the steam outlet of the crystallizer is connected with the steam inlet of a first secondary steam pipeline, a first regulating valve is arranged on the first secondary steam pipeline, the steam outlet of the first secondary steam pipeline is connected with the steam inlet of the heat pump evaporator,

the condensed water outlet of the heat pump evaporator is connected with the liquid inlet of the heat pump condensed water pipeline, the liquid outlet of the heat pump condensed water pipeline is connected with the liquid inlet of the water collecting tank, the steam outlet of the water collecting tank is connected with the steam inlet of the vacuumizing pipeline, the vacuumizing pipeline is sequentially provided with a second regulating valve and a vacuum pump along the flow direction of water vapor, the liquid outlet of the water collecting tank is connected with the liquid inlet of the water collecting tank drainage pipeline, the water collecting tank drainage pipeline is sequentially provided with a drainage pump and a check valve along the flow direction of liquid water,

the outlet of the heat pump compressor is connected with the inlet of a second heat pump working medium gas pipeline, the outlet of the second heat pump working medium gas pipeline is connected with the steam inlet of the heat pump condenser, the liquid outlet of the heat pump condenser is connected with the liquid inlet of a first heat pump working medium liquid pipeline, the liquid outlet of the first heat pump working medium liquid pipeline is connected with the liquid inlet of a first heat pump throttling expansion device, the liquid outlet of the first heat pump throttling expansion device is connected with the liquid inlet of a second heat pump working medium liquid pipeline, the liquid outlet of the second heat pump working medium liquid pipeline is connected with the liquid inlet of the heat pump evaporator, the steam outlet of the heat pump evaporator is connected with the inlet of the first heat pump working medium gas pipeline, the outlet of the first heat pump working medium gas pipeline is connected with the inlet of the heat pump compressor,

the liquid outlet of the crystallizer is connected with the liquid inlet of a first salt solution pipeline, a circulating pump is arranged on the first salt solution pipeline, the liquid outlet of the first salt solution pipeline is connected with the hot medium inlet end of a heat pump condenser, the hot medium outlet end of the heat pump condenser is connected with the liquid inlet of a second salt solution pipeline, the liquid outlet of the second salt solution pipeline is connected with the liquid inlet of a steam-salt solution heat exchange device, the vapor outlet of a third raw steam pipeline is connected with the hot medium inlet end of the steam-salt solution heat exchange device, the hot medium outlet end of the steam-salt solution heat exchange device is connected with the vapor inlet of the second raw steam pipeline, the liquid outlet of the steam-salt solution heat exchange device is connected with the liquid inlet of a tenth salt solution pipeline, the liquid outlet of the tenth salt solution pipeline and the liquid outlet of a fifth salt solution pipeline are connected with the liquid inlet of the third salt solution pipeline after being converged, the liquid outlet of the third salt solution pipeline is connected with the liquid inlet of the fourth salt solution pipeline and the liquid inlet of the sixth salt solution pipeline, the liquid outlet of the fourth salt solution pipeline is connected with the liquid inlet of the crystallization pipeline, the liquid outlet of the crystallization pipeline, the liquid inlet of the crystallization liquid outlet of the crystallization pipeline is connected with the discharge port of the crystallization liquid of the crystallization pipeline, and the discharge port of the crystallization liquid outlet of the crystallization pipeline, and the crystallization liquid outlet of the crystallization pipeline.

the liquid outlet of the heat pump condenser is connected with the liquid inlet of a sixth heat pump working medium liquid pipeline, the liquid outlet of the sixth heat pump working medium liquid pipeline is respectively connected with the liquid inlet of a fourth heat pump working medium liquid pipeline and the liquid inlet of a first heat pump working medium liquid pipeline, the liquid outlet of the fourth heat pump working medium liquid pipeline is connected with the liquid inlet of a second heat pump throttling expansion device, the liquid outlet of the second heat pump throttling expansion device is connected with the liquid inlet of a fifth heat pump working medium liquid pipeline, the liquid outlet of the fifth heat pump working medium liquid pipeline is connected with the liquid inlet of an economizer, the liquid outlet of the economizer is connected with the liquid inlet of an economizer return pipeline, the liquid outlet of the economizer return pipeline is connected with the liquid inlet of a heat pump compressor, the liquid outlet of the first heat pump working medium liquid pipeline is connected with the liquid inlet of the economizer, the liquid outlet of the economizer is connected with the liquid inlet of a third heat pump working medium liquid pipeline, and the liquid outlet of the third heat pump working medium liquid pipeline is connected with the liquid inlet of the first throttling heat pump expansion device.

Furthermore, the crystallizer comprises a seventh salt solution pipeline and an eighth salt solution pipeline, wherein the liquid outlet of the salt separator is connected with the liquid inlet of the seventh salt solution pipeline, the liquid outlet of the sixth salt solution pipeline and the liquid outlet of the seventh salt solution pipeline are converged and then connected with the liquid inlet of the eighth salt solution pipeline, and the liquid outlet of the eighth salt solution pipeline is connected with the bottom of the crystallizer.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model relates to a salt solution evaporation crystallization system of high temperature heat pump drive replaces the vapor compressor in the MVR technique with the high temperature heat pump, under the supplementary start-up of a small amount of steam, adopts the heat of condensation to replace conventional crystallization heat source, realizes the thermal cyclic utilization of secondary steam simultaneously, has reduced the energy consumption of evaporation crystallization technology, has improved evaporation crystallization system's energy utilization efficiency. Meanwhile, the high-temperature heat pump salt solution evaporation crystallization system started by steam in an auxiliary mode greatly reduces the usage amount of raw steam in the crystallization process, and has important practical significance for guiding low-carbon transformation of the crystallization industry in China.

(1) The economic efficiency is as follows: compared with the conventional evaporative crystallization system, the system does not need to prepare a large amount of water vapor in the operation process, and has the advantages of more energy-saving operation, less operation cost and more reasonable energy structure, thereby having good economical efficiency.

(2) Energy conservation: for thermosensitive materials with small boiling point rise, in the low-vacuum evaporation and crystallization process of materials at the evaporation temperature of 45-90 ℃, the conventional multiple-effect evaporation and MVR technologies cannot be well solved, the efficiency is low, the energy consumption is large, the system fully utilizes the last-effect secondary steam heat, the energy recycling is realized, and the energy-saving effect is more remarkable.

(3) Safety: the heat pump system is a closed circulating system, and the stability of the system is ensured.

(4) Stability: after the steam starting mode is added, the system can quickly, stably and efficiently enter the working condition of normal operation.

Drawings

FIG. 1 is a first structural diagram of a salt solution evaporative crystallization system driven by a high-temperature heat pump in a first embodiment of the present invention;

FIG. 2 is a second structural diagram of a salt solution evaporative crystallization system driven by a high-temperature heat pump in the first embodiment of the present invention;

fig. 3 is a third structural diagram of a salt solution evaporative crystallization system driven by a high-temperature heat pump in the first embodiment of the present invention;

FIG. 4 is a fourth structural diagram of a salt solution evaporative crystallization system driven by a high-temperature heat pump in the first embodiment of the present invention;

FIG. 5 is a fifth structural diagram of a salt solution evaporative crystallization system driven by a high-temperature heat pump in the first embodiment of the present invention;

FIG. 6 is a first structural diagram of a salt solution evaporative crystallization system driven by a high-temperature heat pump according to a second embodiment of the present invention;

FIG. 7 is a second structural diagram of a salt solution evaporative crystallization system driven by a high temperature heat pump according to a second embodiment of the present invention;

FIG. 8 is a third structural diagram of a salt solution evaporative crystallization system driven by a high-temperature heat pump in a second embodiment of the present invention;

FIG. 9 is a fourth structural diagram of a salt solution evaporative crystallization system driven by a high-temperature heat pump in the second embodiment of the present invention;

fig. 10 is a fifth structural diagram of a salt solution evaporative crystallization system driven by a high-temperature heat pump in the second embodiment of the present invention.

Description of reference numerals:

1-a crystallizer, 2-a heat pump condenser, 3-a heat pump evaporator, 4-a salt separator, 5-a raw liquid tank, 6-a water collecting tank, 7-a heat pump compressor, 8-a first heat pump throttling expansion device, 9-a second heat pump throttling expansion device, 10-an economizer, 11-a steam-salt solution heat exchange device, 21-a crystal pump, 22-a circulating pump, 23-a draining pump, 24-a vacuum pump, 31-a first regulating valve, 32-a second regulating valve, 33-a check valve, 34-a pressure reducing valve, 41-a first raw steam pipeline, 42-a first secondary steam pipeline, 43-a second secondary steam pipeline, 44-a heat pump condensation water pipeline, 45-a vacuum pumping pipeline, 46-a water collecting tank drainage pipeline and 51-a first heat pump working medium gaseous pipeline, 52-a second heat pump working medium gas pipeline, 53-a first heat pump working medium liquid pipeline, 54-a second heat pump working medium liquid pipeline, 55-a third heat pump working medium liquid pipeline, 56-a fourth heat pump working medium liquid pipeline, 57-a fifth heat pump working medium liquid pipeline, 58-a sixth heat pump working medium liquid pipeline, 59-an economizer return pipeline, 61-a first salt solution pipeline, 62-a second salt solution pipeline, 63-a third salt solution pipeline, 64-a fourth salt solution pipeline, 65-a fifth salt solution pipeline, 66-a sixth salt solution pipeline, 67-a crystallization pipeline, 68-a seventh salt solution pipeline, 69-an eighth salt solution pipeline, 70-a ninth salt solution pipeline, 71-a tenth salt solution pipeline, 72-eleventh salt solution pipeline, 73-twelfth salt solution pipeline, 81-salt outlet pipeline, 82-liquid outlet pipeline and 83-liquid inlet pipeline.

Detailed Description

In the description of the present invention, it should be noted that terms such as "upper", "lower", "front", "rear", "left", "right", etc. in the embodiments indicate terms of orientation, and are only used for simplifying the description of positional relationships based on the drawings of the specification, and do not represent that the elements, devices, etc. indicated must be operated according to the specific orientation and defined operation and method, configuration in the specification, and such terms of orientation do not constitute limitations of the present invention.

In the description of the present invention, it should be noted that the terms "first" and "second" mentioned in the embodiments of the present invention are only used for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.

The first specific embodiment is as follows: referring to fig. 1, the present invention provides a salt solution evaporation crystallization system driven by a high temperature heat pump, which comprises a crystallizer 1, a salt separator 4, a raw solution tank 5, a crystal pump 21, a heat pump condenser 2, a heat pump evaporator 3, a water collection tank 6, a heat pump compressor 7, a first heat pump throttling expansion device 8, a circulating pump 22, a drainage pump 23, a vacuum pump 24, a first regulating valve 31, a second regulating valve 32, a check valve 33, a pressure reducing valve 34, a first raw steam pipeline 41, a first secondary steam pipeline 42, a second secondary steam pipeline 43, a heat pump condensation water pipeline 44, a vacuum pumping pipeline 45, a water collection tank drainage pipeline 46, a first heat pump working medium gaseous pipeline 51, a second heat pump working medium gaseous pipeline 52, a first heat pump working medium liquid pipeline 53, a second heat pump working medium liquid pipeline 54, a first salt solution pipeline 61, a second salt solution pipeline 62, a third salt solution pipeline 63, a fourth salt solution pipeline 64, a fifth salt solution pipeline 65, a sixth salt solution pipeline 66, a crystallization pipeline 67, a salt solution outlet pipeline 81, a liquid inlet pipeline 83,

the steam outlet of the crystallizer 1 is connected with the steam inlet of a first secondary steam pipeline 42, the steam outlet of the first secondary steam pipeline 42 is merged with the steam outlet of a first raw steam pipeline 41 and then is connected with the steam inlet of a second secondary steam pipeline 43, the first secondary steam pipeline 42 is provided with a first regulating valve 31, the first raw steam pipeline 41 is provided with a pressure reducing valve 34, the steam outlet of the second secondary steam pipeline 43 is connected with the steam inlet of the heat pump evaporator 3,

the condensed water outlet of the heat pump evaporator 3 is connected with the liquid inlet of the heat pump condensed water pipeline 44, the liquid outlet of the heat pump condensed water pipeline 44 is connected with the liquid inlet of the water collecting tank 6, the steam outlet of the water collecting tank 6 is connected with the steam inlet of the vacuumizing pipeline 45, the vacuumizing pipeline 45 is sequentially provided with a second regulating valve 32 and a vacuum pump 24 along the flow direction of water vapor, the liquid outlet of the water collecting tank 6 is connected with the liquid inlet of the water collecting tank drainage pipeline 46, the water collecting tank drainage pipeline 46 is sequentially provided with a drainage pump 23 and a check valve 33 along the flow direction of liquid water,

the outlet of the heat pump compressor 7 is connected with the inlet of a second heat pump working medium gaseous pipeline 52, the outlet of the second heat pump working medium gaseous pipeline 52 is connected with the inlet of the heat pump condenser 2, the liquid outlet of the heat pump condenser 2 is connected with the liquid inlet of a first heat pump working medium liquid pipeline 53, the liquid outlet of the first heat pump working medium liquid pipeline 53 is connected with the liquid inlet of a first heat pump throttling expansion device 8, the liquid outlet of the first heat pump throttling expansion device 8 is connected with the liquid inlet of a second heat pump working medium liquid pipeline 54, the liquid outlet of the second heat pump working medium liquid pipeline 54 is connected with the liquid inlet of the heat pump evaporator 3, the outlet of the heat pump evaporator 3 is connected with the inlet of a first heat pump working medium gaseous pipeline 51, the outlet of the first heat pump working medium gaseous pipeline 51 is connected with the inlet of the heat pump compressor 7,

the liquid outlet of the crystallizer 1 is connected with the liquid inlet of a first salt solution pipeline 61, the liquid outlet of the first salt solution pipeline 61 is connected with the heat medium inlet end of a heat pump condenser 2, the heat medium outlet end of the heat pump condenser 2 is connected with the liquid inlet of a second salt solution pipeline 62, a circulating pump 22 is arranged on the first salt solution pipeline 61, the liquid outlet of the second salt solution pipeline 62 is connected with the liquid inlet of a third salt solution pipeline 63 after being converged with the liquid outlet of a fifth salt solution pipeline 65, the liquid outlet of the third salt solution pipeline 63 is respectively connected with the liquid inlet of a fourth salt solution pipeline 64 and the liquid inlet of a sixth salt solution pipeline 66, the liquid outlet of the fourth salt solution pipeline 64 is connected with the liquid inlet of the crystallizer 1, the liquid outlet of the sixth salt solution pipeline 66 is connected with the bottom of the crystallizer 1, the discharge port of the crystallizer 1 is connected with the feed inlet of a crystallization pipeline 67, the discharge port of the crystallization pipeline 67 is connected with the feed inlet of the salt separator 4, a crystal pump 21 is arranged on the crystallization pipeline 67, the discharge port of the salt separator 4 is connected with the feed inlet of a salt separator pipeline 81, the liquid inlet of the salt separator 4 is connected with the liquid inlet of a liquid outlet pipeline 82, the liquid outlet of the liquid tank 5, and the liquid inlet of the raw salt solution pipeline 5 is connected with the liquid inlet of the raw salt solution pipeline 65.

The first heat pump expansion device 8 may be a first heat pump expansion device, and the second heat pump expansion device 9 may be a second heat pump expansion device.

The operation principle of the embodiment is as follows:

the starting process comprises the following steps: the high-temperature and high-pressure raw steam flows into the system through the first raw steam line 41, passes through the pressure reducing valve 34, and flows into the second secondary steam line 43. The decompressed raw steam enters the heat pump evaporator 3 through the second secondary steam pipeline 43, releases heat therein, condenses into liquid, and enters the water collection tank 6 through the heat pump condensed water pipeline 44. The heat released by the generated steam in the heat pump evaporator 3 provides heat for the evaporation of the refrigerant working medium in the heat pump evaporator 3, at this time, the heat pump compressor 7 is started, the gaseous refrigerant working medium generated in the heat pump evaporator 3 enters the heat pump compressor 7 through the first heat pump working medium gaseous pipeline 51 under the suction effect of the gaseous refrigerant working medium, the pressure and the temperature are both increased, then the gaseous refrigerant flows into the heat pump condenser 2 through the second heat pump working medium gaseous pipeline 52 for condensation, and the condensed heat continuously heats the salt solution flowing in through the first salt solution pipeline 61. And continuously operating until the heat pump compressor 7 stably operates, the pressure difference between the heat pump condenser 2 and the heat pump evaporator 3 is stably formed, the heat pump cycle is formed and maintained stably, the reducing valve 34 is closed, the raw steam is stopped being supplied to the system, and the system is started completely.

And (3) a crystallization process: the salt solution is by feed liquor pipeline 83 entering raw liquor tank 5, the raw materials liquid of saving in raw liquor tank 5 passes through fifth salt solution pipeline 65 entering system, this raw materials liquid divides into two strands behind third salt solution pipeline 63 after converging with the salt solution in the second salt solution pipeline 62, one strand passes through fourth salt solution pipeline 64 and gets into in crystallizer 1, another strand flows into the bottom of crystallizer 1 through sixth salt solution pipeline 66, play the suspension effect, make the crystal of the less than main granularity of product float under the solution effect from bottom to top, and the qualified crystal of granularity then can continue to subside to the bottom. When the solution in the crystallizer 1 reaches a certain liquid level, namely 2/3 of the crystallizer 1, the salt solution in the first salt solution pipeline 61 flows into the heat pump condenser 2 from the crystallizer 1 under the action of the circulating pump 22, the temperature of the salt solution is raised after the heat is obtained in the heat pump condenser 2, and the heated salt solution is converged with the raw material solution through the second salt solution pipeline 62, so that the crystallization cycle is completed. The salt solution in the circulation pipeline is continuously heated, is boiled and evaporated in the crystallizer 1 to generate secondary steam, passes through the first secondary steam pipeline 42 and the second secondary steam pipeline 43, enters the heat pump evaporator 3 through the first regulating valve 31, and releases heat in the heat pump evaporator 3 to provide heat for the evaporation of the refrigerant working medium. Under the action of the crystal pump 21, salt crystals with partially saturated salt solution enter the salt separator 4 from the crystallizer 1 through the crystallization pipeline 67, the salt crystals separated by the salt separator 4 are discharged from the salt outlet pipeline 81, and the salt solution separated by the salt separator 4 enters the liquid outlet pipeline 82.

The heat pump cycle process: the heat released by the raw steam in the heat pump evaporator 3 provides heat for the evaporation of the refrigerant working medium therein, at this time, under the suction action of the heat pump compressor 7, the gaseous refrigerant working medium generated in the heat pump evaporator 3 enters the heat pump compressor 7 through the first heat pump working medium gaseous pipeline 51, the pressure and the temperature are both increased to a certain degree, then the gaseous refrigerant working medium flows into the heat pump condenser 2 through the second heat pump working medium gaseous pipeline 52 for condensation, the condensed liquid refrigerant working medium flows into the second heat pump working medium liquid pipeline 54 after throttling and pressure reduction through the first heat pump working medium liquid pipeline 53 and the first heat pump throttling expansion device 8, and then the condensed liquid refrigerant working medium enters the heat pump evaporator 3 for continuous evaporation, thereby completing the heat pump cycle.

In addition, the steam in the second secondary steam pipeline 43 flows into the heat pump evaporator 3 to release heat and condense, the condensed liquid enters the water collecting tank 6 through the heat pump condensed water pipeline 44, when the water in the water collecting tank 6 reaches a certain liquid level, namely 1/3-2/3 of the water collecting tank 6, and then is discharged out of the system through the water collecting tank drainage pipeline 46 and the check valve 33 under the action of the drainage pump 23. In order to ensure the vacuum degree in the system, under the continuous action of the vacuum pump 24, the non-condensable gas in each cavity of the system is exhausted out of the system through the vacuum-pumping pipeline 45 and the second regulating valve 32.

The second specific embodiment: referring to fig. 2, the system further comprises a second heat pump throttling expansion device 9, an economizer 10, a third heat pump working medium liquid pipeline 55, a fourth heat pump working medium liquid pipeline 56, a fifth heat pump working medium liquid pipeline 57, a sixth heat pump working medium liquid pipeline 58 and an economizer return pipeline 59,

the liquid outlet of the heat pump condenser 2 is connected with the liquid inlet of a sixth heat pump working medium liquid pipeline 58, the liquid outlet of the sixth heat pump working medium liquid pipeline 58 is respectively connected with the liquid inlet of a fourth heat pump working medium liquid pipeline 56 and the liquid inlet of a first heat pump working medium liquid pipeline 53, the liquid outlet of the fourth heat pump working medium liquid pipeline 56 is connected with the liquid inlet of a second heat pump throttling expansion device 9, the liquid outlet of the second heat pump throttling expansion device 9 is connected with the liquid inlet of a fifth heat pump working medium liquid pipeline 57, the liquid outlet of the fifth heat pump working medium liquid pipeline 57 is connected with the liquid inlet of the economizer 10, the liquid outlet of the economizer 10 is connected with the liquid inlet of an economizer return pipeline 59, the liquid outlet of the economizer return pipeline 59 is connected with the liquid inlet of the heat pump compressor 7, the liquid outlet of the first heat pump working medium liquid pipeline 53 is connected with the liquid inlet of the economizer 10, the liquid outlet of the economizer 10 is connected with the liquid inlet of a third heat pump working medium liquid pipeline 55, and the liquid outlet of the third heat pump working medium liquid pipeline 55 is connected with the liquid inlet of the first heat pump throttling expansion device 8. Other combinations and connections of this embodiment are the same as those of the first embodiment.

The difference between this embodiment and the first embodiment is that: in the heat pump cycle process, the condensed liquid refrigerant enters a sixth heat pump working medium liquid pipeline 58 and then is divided into two parts, one part of the condensed liquid refrigerant passes through a fourth heat pump working medium liquid pipeline 56 and a fifth heat pump working medium liquid pipeline 57, is throttled and decompressed by a second heat pump throttling expansion device 9 and then enters an economizer 10 as cold fluid, and after exchanging heat with the other part of the refrigerant, the cold fluid reaches an overheat state and is introduced into a heat pump compressor 7 through an economizer return pipeline 59 to be mixed and compressed. The other heat pump working medium passes through the first heat pump working medium liquid pipeline 53, then the supercooling degree of the other heat pump working medium liquid pipeline is improved in the economizer 10, and the other heat pump working medium liquid pipeline passes through the third heat pump working medium liquid pipeline 55, is throttled and decompressed by the first heat pump throttling expansion device 8, then flows into the second heat pump working medium liquid pipeline 54, and then enters the heat pump evaporator 3 to continue to evaporate, so that the heat pump cycle is completed. The economizer 10 improves the heat pump cycle efficiency, continuously recovers the heat of the secondary steam, and greatly improves the stability and the energy utilization efficiency of the whole system.

The third concrete implementation scheme is as follows: as shown in fig. 3, the system further includes an eleventh salt solution pipeline 72, wherein a liquid outlet of the salt separator 4 is connected to a liquid inlet of the eleventh salt solution pipeline 72, and a liquid outlet of the eleventh salt solution pipeline 72 is connected to a liquid inlet of the raw liquid tank 5. Other combinations and connections of this embodiment are the same as those of the second embodiment.

The difference between this embodiment and the second embodiment is that: the saturated salt solution with small salt particles in the eleventh salt solution line 72 flows directly into the raw solution tank 5. The method improves the concentration of the solution entering the system from the raw solution tank 5, accelerates the generation of secondary steam and the crystallization rate of the solution, and improves the operation efficiency.

The fourth concrete implementation scheme is as follows: as shown in fig. 4, the system further includes a seventh saline solution pipeline 68 and an eighth saline solution pipeline 69, a liquid outlet of the salt separator 4 is connected to a liquid inlet of the seventh saline solution pipeline 68, a liquid outlet of the sixth saline solution pipeline 66 and a liquid outlet of the seventh saline solution pipeline 68 are merged and then connected to a liquid inlet of the eighth saline solution pipeline 69, and a liquid outlet of the eighth saline solution pipeline 69 is connected to the bottom of the crystallizer 1. Other combinations and connections of this embodiment are the same as those of the second embodiment.

The operation principle of the present embodiment is substantially the same as that of the third embodiment, except that the saturated salt solution with small salt particles in the eleventh salt solution pipeline 72 in the third embodiment directly flows into the raw solution tank 5, and the saturated salt solution with small salt particles in the seventh salt solution pipeline 68 in the present embodiment joins the salt solution in the sixth salt solution pipeline 66 and then flows into the bottom of the crystallizer 1 through the eighth salt solution pipeline 69. In this way, the saturated salt solution in the seventh salt solution pipeline 68 can continue to absorb heat to evaporate and crystallize in the crystallizer 1, and simultaneously, the saturated salt solution plays a role of suspension, so that crystals with the particle size less than the main particle size of the product float under the action of the solution from bottom to top, and crystals with qualified particle size continue to settle to the bottom.

The fifth concrete implementation scheme is as follows: as shown in fig. 5, the heat pump system further includes a ninth salt solution pipeline 70 and a twelfth salt solution pipeline 73, wherein a liquid outlet of the salt separator 4 is connected to a liquid inlet of the twelfth salt solution pipeline 73, a liquid outlet of the twelfth salt solution pipeline 73 is connected to a liquid inlet of the ninth salt solution pipeline 70 after being merged with a liquid outlet of the first salt solution pipeline 61, and a liquid outlet of the ninth salt solution pipeline 70 is connected to a heat medium inlet of the heat pump condenser 2. Other combinations and connections of this embodiment are the same as those of the second embodiment.

The operation principle of the present embodiment is substantially the same as that of the fourth embodiment, except that the saturated salt solution with small salt particles in the seventh saline solution pipeline 68 in the fourth embodiment is merged with the saline solution in the sixth saline solution pipeline 66 and flows into the bottom of the crystallizer 1 through the eighth saline solution pipeline 69, and the saturated salt solution with small salt particles in the twelfth saline solution pipeline 73 in the present embodiment is merged with the saline solution in the first saline solution pipeline 61 and flows into the heat pump condenser 2 through the ninth saline solution pipeline 70. In the mode, the mixed solution is added before entering the heat pump condenser 2 for heat exchange, so that the solution is fully heated, and the stability of system operation is improved.

The sixth specific embodiment: referring to fig. 6, the present invention provides a high temperature heat pump driven salt solution evaporation crystallization system, which comprises a crystallizer 1, a salt separator 4, a raw solution tank 5, a crystal pump 21, a heat pump condenser 2, a heat pump evaporator 3, a water collecting tank 6, a heat pump compressor 7, a first heat pump throttling expansion device 8, a steam-salt solution heat exchange device 11, a circulating pump 22, a draining pump 23, a vacuum pump 24, a first regulating valve 31, a second regulating valve 32, a check valve 33, a first secondary steam pipeline 42, a heat pump condensed water pipeline 44, a vacuum pumping pipeline 45, a water collecting tank draining pipeline 46, a second raw steam pipeline 47, a third raw steam pipeline 48, a first heat pump working medium gaseous pipeline 51, a second heat pump working medium gaseous pipeline 52, a first heat pump working medium liquid pipeline 53, a second heat pump working medium liquid pipeline 54, a first salt solution pipeline 61, a second salt solution pipeline 62, a third salt solution pipeline 63, a fourth salt solution pipeline 64, a fifth salt solution pipeline 65, a sixth salt solution pipeline 66, a crystallization pipeline 67, a tenth salt solution pipeline 81, a salt solution outlet pipeline 82, a liquid pipeline 82,

the steam outlet of the crystallizer 1 is connected with the steam inlet of the first secondary steam pipeline 42, the steam outlet of the first secondary steam pipeline 42 is connected with the steam inlet of the heat pump evaporator 3, the first secondary steam pipeline 42 is provided with a first regulating valve 31,

the condensed water outlet of the heat pump evaporator 3 is connected with the liquid inlet of the heat pump condensed water pipeline 44, the liquid outlet of the heat pump condensed water pipeline 44 is connected with the liquid inlet of the water collecting tank 6, the steam outlet of the water collecting tank 6 is connected with the steam inlet of the vacuumizing pipeline 45, the vacuumizing pipeline 45 is sequentially provided with a second regulating valve 32 and a vacuum pump 24 along the flow direction of water steam, the liquid outlet of the water collecting tank 6 is connected with the liquid inlet of the water collecting tank drainage pipeline 46, the water collecting tank drainage pipeline 46 is sequentially provided with a drainage pump 23 and a check valve 33 along the flow direction of liquid water,

the outlet of the heat pump compressor 7 is connected with the inlet of a second heat pump working medium gas pipeline 52, the outlet of the second heat pump working medium gas pipeline 52 is connected with the steam inlet of the heat pump condenser 2, the liquid outlet of the heat pump condenser 2 is connected with the liquid inlet of a first heat pump working medium liquid pipeline 53, the liquid outlet of the first heat pump working medium liquid pipeline 53 is connected with the liquid inlet of a first heat pump throttling expansion device 8, the liquid outlet of the first heat pump throttling expansion device 8 is connected with the liquid inlet of a second heat pump working medium liquid pipeline 54, the liquid outlet of the second heat pump working medium liquid pipeline 54 is connected with the liquid inlet of the heat pump evaporator 3, the steam outlet of the heat pump evaporator 3 is connected with the inlet of a first heat pump working medium gas pipeline 51, the outlet of the first heat pump working medium gas pipeline 51 is connected with the inlet of the heat pump compressor 7,

the liquid outlet of the crystallizer 1 is connected with the liquid inlet of a first salt solution pipeline 61, the liquid outlet of the first salt solution pipeline 61 is connected with the heat medium inlet end of a heat pump condenser 2, the heat medium outlet end of the heat pump condenser 2 is connected with the liquid inlet of a second salt solution pipeline 62, a circulating pump 22 is arranged on the first salt solution pipeline 61, the steam outlet of a third raw steam pipeline 48 is connected with the heat medium inlet end of a steam-salt solution heat exchange device 11, the heat medium outlet end of the steam-salt solution heat exchange device 11 is connected with the steam inlet of a second raw steam pipeline 47, the liquid outlet of the second salt solution pipeline 62 is connected with the liquid inlet of the steam-salt solution heat exchange device 11, the liquid outlet of the steam-salt solution heat exchange device 11 is connected with the liquid inlet of a tenth salt solution pipeline 71, the liquid outlet of the tenth salt solution pipeline 71 and the liquid outlet of a fifth salt solution pipeline 65 are converged and then connected with the liquid inlet of a third salt solution pipeline 63, the liquid outlet of the third salt solution pipeline 63 is respectively connected with the liquid inlet of a fourth salt solution pipeline 64 and the liquid inlet of a sixth salt solution pipeline 66, the liquid outlet of the fourth salt solution pipeline 64 is connected with the liquid inlet of the crystallizer 1, the liquid outlet of the sixth salt solution pipeline 66 is connected with the bottom of the crystallizer 1, the discharge port of the crystallizer 1 is connected with the feed port of a crystallization pipeline 67, the discharge port of the crystallization pipeline 67 is connected with the feed port of a salt separator 4, the crystallization pipeline 67 is provided with a crystal pump 21, the discharge port of the salt separator 4 is connected with the feed port of a salt outlet pipeline 81, the liquid outlet of the salt separator 4 is connected with the liquid inlet of a liquid outlet pipeline 82, the liquid outlet of a liquid inlet pipeline 83 is connected with the liquid inlet of the raw liquid tank 5, and the liquid outlet of the raw liquid tank 5 is connected with the liquid inlet of a fifth salt solution pipeline 65, the outlet of the fifth saline solution line 65 is connected to the outlet of the second saline solution line 62.

The steam-salt solution heat exchange device 11 may be a steam-salt solution heat exchanger.

The operation principle of the embodiment is as follows:

the starting process comprises the following steps: high-temperature and high-pressure raw steam enters the steam-salt solution heat exchange device 11 through the third raw steam pipeline 48 to exchange heat with salt solution in the circulating pipeline, the salt solution is boiled and evaporated in the crystallizer 1 after being continuously heated to generate secondary steam, the secondary steam enters the heat pump evaporator 3 through the first secondary steam pipeline 42 and the first regulating valve 31, heat is released in the heat pump evaporator, and the secondary steam is condensed into liquid and then enters the water collecting tank 6 through the heat pump condensed water pipeline 44. The heat that the secondary steam released in heat pump evaporator 3 provides the heat for the evaporation of refrigerant working medium therein, at this moment, open heat pump compressor 7, under its effect of breathing in, the gaseous refrigerant working medium that produces in heat pump evaporator 3 gets into heat pump compressor 7 through first heat pump working medium gaseous state pipeline 51, pressure and temperature all obtain rising, then rethread second heat pump working medium gaseous state pipeline 52 flows into heat pump condenser 2 and condenses, the heat of condensation lasts the heating and passes through the salt solution of first salt solution pipeline 61 inflow. And continuously operating until the heat pump compressor 7 stably operates, the pressure difference between the heat pump condenser 2 and the heat pump evaporator 3 is stably formed, the heat pump cycle is formed and maintained stably, the raw steam is stopped from being supplied into the third raw steam pipeline 48, and the system is started.

And (3) a crystallization process: the salt solution is by feed liquor pipeline 83 entering raw liquor tank 5, the raw materials liquid of saving in raw liquor tank 5 passes through fifth salt solution pipeline 65 entering system, this raw materials liquid divides into two strands behind third salt solution pipeline 63 after converging with the salt solution in the tenth salt solution pipeline 71, one strand gets into crystallizer 1 through fourth salt solution pipeline 64, another strand flows into the bottom of crystallizer 1 through sixth salt solution pipeline 66, thereby play the suspension effect, the crystal that makes the less than main granularity of product floats under the solution effect from bottom to top, and the qualified crystal of granularity then can continue to subside to the bottom. When the solution in the crystallizer 1 reaches a certain liquid level, namely 2/3 of the crystallizer 1, the salt solution in the first salt solution pipeline 61 flows into the heat pump condenser 2 from the crystallizer 1 under the action of the circulating pump 22, the temperature of the salt solution is raised after heat is obtained in the heat pump condenser 2, the heated salt solution is converged with the raw material solution after passing through the second salt solution pipeline 62 and the tenth salt solution pipeline 71, and at the moment, the heat exchanger is in a stop state, so that the crystallization cycle is completed. The salt solution in the circulation pipeline is continuously heated, boils and evaporates in the crystallizer 1 to generate secondary steam, enters the heat pump evaporator 3 through the first secondary steam pipeline 42 and the first regulating valve 31, and releases heat in the heat pump evaporator 3 to provide heat for the evaporation of the refrigerant working medium. Salt crystals with partially saturated salt solution enter the salt separator 4 from the crystallizer 1 through the crystallization pipeline 67 under the action of the crystal pump 21, the salt crystals separated by the salt separator 4 are discharged from the salt outlet pipeline 81, and the salt solution separated by the salt separator 4 enters the liquid outlet pipeline 82.

The heat pump cycle process: the heat released by the raw steam in the heat pump evaporator 3 provides heat for the evaporation of the refrigerant working medium therein, at the moment, under the suction action of the heat pump compressor 7, the gaseous refrigerant working medium generated in the heat pump evaporator 3 enters the heat pump compressor 7 through the first heat pump working medium gaseous pipeline 51, the pressure and the temperature are increased to a certain degree, then the gaseous refrigerant working medium flows into the heat pump condenser 2 through the second heat pump working medium gaseous pipeline 52 for condensation, the condensed liquid refrigerant working medium flows into the second heat pump working medium liquid pipeline 54 after throttling and pressure reducing through the first heat pump working medium liquid pipeline 53 and the first heat pump throttling expansion device 8, and then the condensed liquid refrigerant working medium enters the heat pump evaporator 3 for continuous evaporation, thereby completing the heat pump cycle.

On the whole, under the good starting condition formed by the method, the heat pump condenser 2 serves as a high-temperature heat source of the crystallization system, and the heat of the secondary steam is continuously recovered, so that the stability and the energy utilization efficiency of the whole system are greatly improved.

The seventh specific embodiment: referring to fig. 7, the system further comprises a second heat pump throttling expansion device 9, an economizer 10, a third heat pump working medium liquid pipeline 55, a fourth heat pump working medium liquid pipeline 56, a fifth heat pump working medium liquid pipeline 57, a sixth heat pump working medium liquid pipeline 58 and an economizer return pipeline 59,

the liquid outlet of the heat pump condenser 2 is connected with the liquid inlet of a sixth heat pump working medium liquid pipeline 58, the liquid outlet of the sixth heat pump working medium liquid pipeline 58 is respectively connected with the liquid inlet of a fourth heat pump working medium liquid pipeline 56 and the liquid inlet of a first heat pump working medium liquid pipeline 53, the liquid outlet of the fourth heat pump working medium liquid pipeline 56 is connected with the liquid inlet of a second heat pump throttling expansion device 9, the liquid outlet of the second heat pump throttling expansion device 9 is connected with the liquid inlet of a fifth heat pump working medium liquid pipeline 57, the liquid outlet of the fifth heat pump working medium liquid pipeline 57 is connected with the liquid inlet of the economizer 10, the liquid outlet of the economizer 10 is connected with the liquid inlet of an economizer return pipeline 59, the liquid outlet of the economizer return pipeline 59 is connected with the liquid inlet of the heat pump compressor 7, the liquid outlet of the first heat pump working medium liquid pipeline 53 is connected with the liquid inlet of the economizer 10, the liquid outlet of the economizer 10 is connected with the liquid inlet of a third heat pump working medium pipeline 55, and the liquid outlet of the third heat pump working medium pipeline 55 is connected with the liquid inlet of the first heat pump throttling expansion device 8. Other combinations and connections of this embodiment are the same as those of the sixth embodiment.

The difference between this embodiment and the sixth embodiment is that: in the heat pump cycle process, the condensed liquid refrigerant enters a sixth heat pump working medium liquid pipeline 58 and then is divided into two parts, one part of the condensed liquid refrigerant passes through a fourth heat pump working medium liquid pipeline 56 and a fifth heat pump working medium liquid pipeline 57, is throttled and decompressed by a second heat pump throttling expansion device 9 and then enters an economizer 10 as cold fluid, and after exchanging heat with the other part of the refrigerant, the cold fluid reaches an overheat state and is introduced into a heat pump compressor 7 through an economizer return pipeline 59 to be mixed and compressed. The other heat pump working medium passes through the first heat pump working medium liquid pipeline 53, then the supercooling degree of the other heat pump working medium liquid pipeline is improved in the economizer 10, and the other heat pump working medium liquid pipeline passes through the third heat pump working medium liquid pipeline 55, is throttled and decompressed by the first heat pump throttling expansion device 8, then flows into the second heat pump working medium liquid pipeline 54, and then enters the heat pump evaporator 3 to continue to evaporate, so that the heat pump cycle is completed. The economizer 10 improves the heat pump cycle efficiency, continuously recovers the heat of the secondary steam, and greatly improves the stability and the energy utilization efficiency of the whole system.

The specific embodiment eight: as shown in fig. 8, the system further includes an eleventh salt solution pipeline 72, wherein a liquid outlet of the salt separator 4 is connected to a liquid inlet of the eleventh salt solution pipeline 72, and a liquid outlet of the eleventh salt solution pipeline 72 is connected to a liquid inlet of the raw liquid tank 5. Other combinations and connections of this embodiment are the same as those of the seventh embodiment.

The present embodiment differs from the seventh embodiment in that: the saturated salt solution with small salt particles in the eleventh salt solution line 72 flows directly into the raw solution tank 5. The method improves the concentration of the solution entering the system from the raw solution tank 5, accelerates the generation of secondary steam and the crystallization rate of the solution, and improves the operation efficiency.

The specific embodiment is nine: as shown in fig. 9, the system further includes a seventh salt solution pipeline 68 and an eighth salt solution pipeline 69, a liquid outlet of the salt separator 4 is connected to a liquid inlet of the seventh salt solution pipeline 68, a liquid outlet of the sixth salt solution pipeline 66 and a liquid outlet of the seventh salt solution pipeline 68 are merged and then connected to a liquid inlet of the eighth salt solution pipeline 69, and a liquid outlet of the eighth salt solution pipeline 69 is connected to the bottom of the crystallizer 1. Other combinations and connections of this embodiment are the same as those of the seventh embodiment.

The operation principle of the present embodiment is substantially the same as that of the eighth embodiment, except that in the eighth embodiment, the saturated salt solution with small salt particles in the eleventh salt solution pipeline 72 directly flows into the raw solution tank 5, and in the present embodiment, the saturated salt solution with small salt particles in the seventh salt solution pipeline 68 and the salt solution in the sixth salt solution pipeline 66 join and then flow into the bottom of the crystallizer 1 through the eighth salt solution pipeline 69. In this way, the saturated salt solution in the seventh salt solution pipeline 68 can continue to absorb heat to evaporate and crystallize in the crystallizer 1, and simultaneously, the saturated salt solution plays a role of suspension, so that crystals with the particle size less than the main particle size of the product float under the action of the solution from bottom to top, and crystals with qualified particle size continue to settle to the bottom.

The specific embodiment ten: as shown in fig. 10, the heat pump system further includes a ninth salt solution pipeline 70 and a twelfth salt solution pipeline 73, wherein a liquid outlet of the salt separator 4 is connected to a liquid inlet of the twelfth salt solution pipeline 73, a liquid outlet of the twelfth salt solution pipeline 73 is connected to a liquid inlet of the ninth salt solution pipeline 70 after being merged with a liquid outlet of the first salt solution pipeline 61, and a liquid outlet of the ninth salt solution pipeline 70 is connected to a heat medium inlet of the heat pump condenser 2. Other combinations and connections of this embodiment are the same as those of the seventh embodiment.

The operation principle of the present embodiment is substantially the same as that of the ninth embodiment, except that in the ninth embodiment, the saturated salt solution with small salt particles in the seventh saline solution pipeline 68 and the saline solution in the sixth saline solution pipeline 66 are merged and then flow into the bottom of the crystallizer 1 through the eighth saline solution pipeline 69, and in the present embodiment, the saturated salt solution with small salt particles in the twelfth saline solution pipeline 73 and the saline solution in the first saline solution pipeline 61 are merged and then flow into the heat pump condenser 2 through the ninth saline solution pipeline 70. In the mode, the mixed solution is added before entering the heat pump condenser 2 for heat exchange, so that the solution is fully heated, and the stability of system operation is improved.

Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. The utility model discloses a field technical personnel can carry out various changes and amending under the prerequisite of the spirit and scope that do not deviate from the utility model discloses, and these changes all will fall into with the amendment the utility model discloses a protection scope.

Claims

1. The utility model provides a salt solution evaporation crystallization system of high temperature heat pump drive, includes crystallizer (1), salt separator (4), stock solution jar (5), crystal pump (21), its characterized in that: also comprises a heat pump condenser (2), a heat pump evaporator (3), a water collecting tank (6), a heat pump compressor (7), a first heat pump throttling expansion device (8), a circulating pump (22), a draining pump (23), a vacuum pump (24), a first regulating valve (31), a second regulating valve (32), a check valve (33), a pressure reducing valve (34), a first raw steam pipeline (41), a first secondary steam pipeline (42), a second secondary steam pipeline (43), a heat pump condensed water pipeline (44), a vacuumizing pipeline (45), a water collecting tank draining pipeline (46), a first heat pump working medium gaseous pipeline (51), a second heat pump working medium gaseous pipeline (52), a first heat pump working medium liquid pipeline (53), a second heat pump working medium liquid pipeline (54), a first salt solution pipeline (61), a second salt solution pipeline (62), a third salt solution pipeline (63), a fourth salt solution pipeline (64), a fifth salt solution pipeline (65), a sixth salt solution pipeline (66), a crystallization pipeline (67), a salt solution pipeline (81), a liquid outlet pipeline (82) and a liquid inlet pipeline (83),

the steam outlet of the crystallizer (1) is connected with the steam inlet of a first secondary steam pipeline (42), the steam outlet of the first secondary steam pipeline (42) and the steam outlet of a first raw steam pipeline (41) are converged and then connected with the steam inlet of a second secondary steam pipeline (43), the first secondary steam pipeline (42) is provided with a first regulating valve (31), the first raw steam pipeline (41) is provided with a pressure reducing valve (34), the steam outlet of the second secondary steam pipeline (43) is connected with the steam inlet of a heat pump evaporator (3),

a condensed water outlet of the heat pump evaporator (3) is connected with a liquid inlet of a heat pump condensed water pipeline (44), a liquid outlet of the heat pump condensed water pipeline (44) is connected with a liquid inlet of a water collecting tank (6), a steam outlet of the water collecting tank (6) is connected with a steam inlet of a vacuumizing pipeline (45), a second regulating valve (32) and a vacuum pump (24) are sequentially arranged on the vacuumizing pipeline (45) along the flow direction of water vapor, a liquid outlet of the water collecting tank (6) is connected with a liquid inlet of a water collecting tank drainage pipeline (46), a drainage pump (23) and a check valve (33) are sequentially arranged on the water collecting tank drainage pipeline (46) along the flow direction of liquid water,

the outlet of the heat pump compressor (7) is connected with the inlet of a second heat pump working medium gas pipeline (52), the outlet of the second heat pump working medium gas pipeline (52) is connected with the inlet of the heat pump condenser (2), the liquid outlet of the heat pump condenser (2) is connected with the liquid inlet of a first heat pump working medium liquid pipeline (53), the liquid outlet of the first heat pump working medium liquid pipeline (53) is connected with the liquid inlet of a first heat pump throttling expansion device (8), the liquid outlet of the first heat pump throttling expansion device (8) is connected with the liquid inlet of a second heat pump working medium liquid pipeline (54), the liquid outlet of the second heat pump working medium liquid pipeline (54) is connected with the liquid inlet of the heat pump evaporator (3), the outlet of the heat pump evaporator (3) is connected with the inlet of a first heat pump working medium gas pipeline (51), the outlet of the first heat pump working medium gas pipeline (51) is connected with the inlet of the heat pump compressor (7),

the liquid outlet of the crystallizer (1) is connected with the liquid inlet of a first salt solution pipeline (61), the liquid outlet of the first salt solution pipeline (61) is connected with the heat medium inlet end of a heat pump condenser (2), the heat medium outlet end of the heat pump condenser (2) is connected with the liquid inlet of a second salt solution pipeline (62), a circulating pump (22) is arranged on the first salt solution pipeline (61), the liquid outlet of the second salt solution pipeline (62) is connected with the liquid inlet of a third salt solution pipeline (63) after being converged with the liquid outlet of a fifth salt solution pipeline (65), the liquid outlet of the third salt solution pipeline (63) is respectively connected with the liquid inlet of a fourth salt solution pipeline (64) and the liquid inlet of a sixth salt solution pipeline (66), the liquid outlet of the fourth salt solution pipeline (64) is connected with the liquid inlet of the crystallizer (1), the liquid outlet of the sixth salt solution pipeline (66) is connected with the bottom of the crystallizer (1), the liquid outlet of the crystallizer (1) is connected with the feed inlet of a crystallization pipeline (67), the liquid outlet of the crystallization pipeline (67) is connected with the liquid inlet of the salt separator (4), the liquid outlet of the salt separator (83) is connected with the liquid inlet of a salt separator (21) and the liquid inlet of a salt separator (4), and a liquid inlet of a salt separator (82) of a salt separator (83) is connected with a salt separator tube (21), the liquid outlet of the stock solution tank (5) is connected with the liquid inlet of the fifth salt solution pipeline (65).

2. The salt solution evaporative crystallization system driven by a high-temperature heat pump as claimed in claim 1, wherein: also comprises a second heat pump throttling expansion device (9), an economizer (10), a third heat pump working medium liquid pipeline (55), a fourth heat pump working medium liquid pipeline (56), a fifth heat pump working medium liquid pipeline (57), a sixth heat pump working medium liquid pipeline (58) and an economizer return pipeline (59),

the liquid outlet of the heat pump condenser (2) is connected with the liquid inlet of a sixth heat pump working medium liquid pipeline (58), the liquid outlet of the sixth heat pump working medium liquid pipeline (58) is respectively connected with the liquid inlet of a fourth heat pump working medium liquid pipeline (56) and the liquid inlet of a first heat pump working medium liquid pipeline (53), the liquid outlet of the fourth heat pump working medium liquid pipeline (56) is connected with the liquid inlet of a second heat pump throttling expansion device (9), the liquid outlet of the second heat pump throttling expansion device (9) is connected with the liquid inlet of a fifth heat pump working medium liquid pipeline (57), the liquid outlet of the fifth heat pump working medium liquid pipeline (57) is connected with the liquid inlet of an economizer (10), the liquid outlet of the economizer (10) is connected with the liquid inlet of an economizer return pipeline (59), the liquid outlet of the economizer return pipeline (59) is connected with the liquid inlet of a heat pump compressor (7),

the liquid outlet of the first heat pump working medium liquid pipeline (53) is connected with the liquid inlet of the economizer (10), the liquid outlet of the economizer (10) is connected with the liquid inlet of the third heat pump working medium liquid pipeline (55), and the liquid outlet of the third heat pump working medium liquid pipeline (55) is connected with the liquid inlet of the first heat pump throttling expansion device (8).

3. The system according to claim 2, wherein the system comprises: the device is characterized by further comprising an eleventh salt solution pipeline (72), wherein a liquid outlet of the salt separator (4) is connected with a liquid inlet of the eleventh salt solution pipeline (72), and a liquid outlet of the eleventh salt solution pipeline (72) is connected with a liquid inlet of the stock solution tank (5).

4. The salt solution evaporative crystallization system driven by a high-temperature heat pump as claimed in claim 2, wherein: the crystallizer is characterized by further comprising a seventh salt solution pipeline (68) and an eighth salt solution pipeline (69), wherein a liquid outlet of the salt separator (4) is connected with a liquid inlet of the seventh salt solution pipeline (68), a liquid outlet of the sixth salt solution pipeline (66) and a liquid outlet of the seventh salt solution pipeline (68) are converged and then connected with a liquid inlet of the eighth salt solution pipeline (69), and a liquid outlet of the eighth salt solution pipeline (69) is connected with the bottom of the crystallizer (1).

5. The salt solution evaporative crystallization system driven by a high-temperature heat pump as claimed in claim 2, wherein: the heat pump condenser is characterized by further comprising a ninth salt solution pipeline (70) and a twelfth salt solution pipeline (73), wherein a liquid outlet of the salt separator (4) is connected with a liquid inlet of the twelfth salt solution pipeline (73), a liquid outlet of the twelfth salt solution pipeline (73) is connected with a liquid inlet of the ninth salt solution pipeline (70) after being converged with a liquid outlet of the first salt solution pipeline (61), and a liquid outlet of the ninth salt solution pipeline (70) is connected with a heat medium inlet end of the heat pump condenser (2).

6. The utility model provides a salt solution evaporation crystallization system of high temperature heat pump drive, it includes crystallizer (1), salt separator (4), stock solution jar (5), crystal pump (21), its characterized in that: the system also comprises a heat pump condenser (2), a heat pump evaporator (3), a water collecting tank (6), a heat pump compressor (7), a first heat pump throttling expansion device (8), a steam-salt solution heat exchange device (11), a circulating pump (22), a drainage pump (23), a vacuum pump (24), a first regulating valve (31), a second regulating valve (32), a check valve (33), a first secondary steam pipeline (42), a heat pump condensed water pipeline (44), a vacuumizing pipeline (45), a water collecting tank drainage pipeline (46), a second raw steam pipeline (47), a third raw steam pipeline (48), a first heat pump working medium gas pipeline (51), a second heat pump working medium gas pipeline (52), a first heat pump working medium liquid pipeline (53), a second heat pump working medium liquid pipeline (54), a first salt solution pipeline (61), a second salt solution pipeline (62), a third salt solution pipeline (63), a fourth salt solution pipeline (64), a fifth salt solution pipeline (65), a sixth salt solution pipeline (66), a crystallization pipeline (67), a tenth salt solution pipeline (71), a salt solution pipeline (81), a liquid inlet pipe (83) and a liquid outlet pipe (83),

the steam outlet of the crystallizer (1) is connected with the steam inlet of a first secondary steam pipeline (42), a first regulating valve (31) is arranged on the first secondary steam pipeline (42), the steam outlet of the first secondary steam pipeline (42) is connected with the steam inlet of a heat pump evaporator (3),

the outlet of the heat pump compressor (7) is connected with the inlet of a second heat pump working medium gas pipeline (52), the outlet of the second heat pump working medium gas pipeline (52) is connected with the steam inlet of the heat pump condenser (2), the liquid outlet of the heat pump condenser (2) is connected with the liquid inlet of a first heat pump working medium liquid pipeline (53), the liquid outlet of the first heat pump working medium liquid pipeline (53) is connected with the liquid inlet of a first heat pump throttling expansion device (8), the liquid outlet of the first heat pump throttling expansion device (8) is connected with the liquid inlet of a second heat pump working medium liquid pipeline (54), the liquid outlet of the second heat pump working medium liquid pipeline (54) is connected with the liquid inlet of the heat pump evaporator (3), the steam outlet of the heat pump evaporator (3) is connected with the inlet of the first heat pump working medium gas pipeline (51), the outlet of the first heat pump working medium gas pipeline (51) is connected with the inlet of the heat pump compressor (7),

the liquid outlet of the crystallizer (1) is connected with the liquid inlet of a first salt solution pipeline (61), a circulating pump (22) is arranged on the first salt solution pipeline (61), the liquid outlet of the first salt solution pipeline (61) is connected with the hot medium inlet end of a heat pump condenser (2), the hot medium outlet end of the heat pump condenser (2) is connected with the liquid inlet of a second salt solution pipeline (62), the liquid outlet of the second salt solution pipeline (62) is connected with the liquid inlet of a steam-salt solution heat exchange device (11), the steam outlet of a third raw steam pipeline (48) is connected with the hot medium inlet end of the steam-salt solution heat exchange device (11), the hot medium outlet end of the steam-salt solution heat exchange device (11) is connected with the steam inlet of a second raw steam pipeline (47), the liquid outlet of the steam-salt solution heat exchange device (11) is connected with the liquid inlet of a tenth salt solution pipeline (71), the liquid outlet of the tenth salt solution pipeline (71) and the liquid outlet of a fifth salt solution pipeline (65) are merged and then connected with the liquid inlet of a third salt solution pipeline (63), the liquid outlet of the tenth salt solution pipeline (71) is connected with the liquid inlet of a sixth salt solution pipeline (64) of a fourth salt solution pipeline (64), and a liquid inlet of a fourth salt solution pipeline (64) are respectively connected with the liquid inlet of the salt solution pipeline (1), the discharge gate of crystallizer (1) is connected with the feed inlet of crystallization pipeline (67), the discharge gate of crystallization pipeline (67) is connected with the feed inlet of salt separator (4), be equipped with crystal pump (21) on crystallization pipeline (67), the discharge gate of salt separator (4) is connected with the feed inlet of salt pipeline (81), the liquid outlet of salt separator (4) is connected with the inlet of drain pipe (82), the liquid outlet of feed pipe (83) is connected with the inlet of raw materials jar (5), the liquid outlet of raw materials jar (5) is connected with the inlet of fifth salt solution pipeline (65).

7. The salt solution evaporative crystallization system driven by a high-temperature heat pump as claimed in claim 6, wherein: also comprises a second heat pump throttling expansion device (9), an economizer (10), a third heat pump working medium liquid pipeline (55), a fourth heat pump working medium liquid pipeline (56), a fifth heat pump working medium liquid pipeline (57), a sixth heat pump working medium liquid pipeline (58) and an economizer return pipeline (59),

the liquid outlet of the heat pump condenser (2) is connected with the liquid inlet of a sixth heat pump working medium liquid pipeline (58), the liquid outlet of the sixth heat pump working medium liquid pipeline (58) is respectively connected with the liquid inlet of a fourth heat pump working medium liquid pipeline (56) and the liquid inlet of a first heat pump working medium liquid pipeline (53), the liquid outlet of the fourth heat pump working medium liquid pipeline (56) is connected with the liquid inlet of a second heat pump throttling expansion device (9), the liquid outlet of the second heat pump throttling expansion device (9) is connected with the liquid inlet of a fifth heat pump working medium liquid pipeline (57), the liquid outlet of the fifth heat pump working medium liquid pipeline (57) is connected with the liquid inlet of an economizer (10), the liquid outlet of the economizer (10) is connected with the liquid inlet of an economizer return pipeline (59), the liquid outlet of the economizer return pipeline (59) is connected with the liquid inlet of a heat pump compressor (7), the liquid outlet of the first heat pump working medium liquid pipeline (53) is connected with the liquid inlet of the economizer (10), the liquid outlet of the economizer (10) is connected with the liquid inlet of a third heat pump working medium liquid pipeline (55), and the liquid inlet of a first heat pump working medium throttling expansion device (8) are connected with the liquid inlet of the economizer.

8. The salt solution evaporative crystallization system driven by a high-temperature heat pump as claimed in claim 7, wherein: the device is characterized by further comprising an eleventh salt solution pipeline (72), wherein a liquid outlet of the salt separator (4) is connected with a liquid inlet of the eleventh salt solution pipeline (72), and a liquid outlet of the eleventh salt solution pipeline (72) is connected with a liquid inlet of the stock solution tank (5).

9. The salt solution evaporative crystallization system driven by a high-temperature heat pump as claimed in claim 7, wherein: the crystallizer is characterized by further comprising a seventh salt solution pipeline (68) and an eighth salt solution pipeline (69), wherein a liquid outlet of the salt separator (4) is connected with a liquid inlet of the seventh salt solution pipeline (68), a liquid outlet of the sixth salt solution pipeline (66) and a liquid outlet of the seventh salt solution pipeline (68) are converged and then connected with a liquid inlet of the eighth salt solution pipeline (69), and a liquid outlet of the eighth salt solution pipeline (69) is connected with the bottom of the crystallizer (1).

10. The salt solution evaporative crystallization system driven by a high-temperature heat pump as claimed in claim 7, wherein: the heat pump system is characterized by further comprising a ninth salt solution pipeline (70) and a twelfth salt solution pipeline (73), wherein a liquid outlet of the salt separator (4) is connected with a liquid inlet of the twelfth salt solution pipeline (73), a liquid outlet of the twelfth salt solution pipeline (73) is connected with a liquid inlet of the ninth salt solution pipeline (70) after being converged with a liquid outlet of the first salt solution pipeline (61), and a liquid outlet of the ninth salt solution pipeline (70) is connected with a heat medium inlet end of the heat pump condenser (2).