CN113623899B

CN113623899B - Energy-saving process of heat pump evaporation complete equipment

Info

Publication number: CN113623899B
Application number: CN202110946124.9A
Authority: CN
Inventors: 项光武; 项文远; 项亚飞; 项一帆; 林永绍; 阳章
Original assignee: Zhejiang Zhentian Machinery Co ltd
Current assignee: Zhejiang Zhentian Machinery Co ltd
Priority date: 2021-08-17
Filing date: 2021-08-17
Publication date: 2023-04-28
Anticipated expiration: 2041-08-17
Also published as: CN113623899A

Abstract

The invention discloses an energy-saving process of heat pump evaporation complete equipment, which belongs to the technical field of steam heat pumps, and the scheme can realize that when scale is generated on the inner wall of a water pipe, ammonium chloride powder on the inner wall of the pipe is decomposed into ammonia and hydrogen chloride by heating, so that an air bag extrudes a deformation balloon to release scale cleaning agent in the deformation balloon, and the scale cleaning agent on the surface of a diaphragm is cleaned.

Description

Energy-saving process of heat pump evaporation complete equipment

Technical Field

The invention relates to the technical field of steam heat pumps, in particular to an energy-saving process of heat pump evaporation complete equipment.

Background

The heat pump is a high-efficiency energy-saving device which fully utilizes low-grade heat energy, heat can be spontaneously transferred from a high-temperature object to a low-temperature object, but cannot be spontaneously conducted in the opposite direction, the working principle of the heat pump is a mechanical device which forces the heat to flow from the low-temperature object to the high-temperature object in a reverse circulation mode, only a small amount of reverse circulation net work is consumed, larger heat supply amount can be obtained, and the low-grade heat energy which is difficult to apply can be effectively utilized to achieve the purpose of energy saving.

At present, in the use process of the steam heat pump, a layer of scale can be generated on the inner wall due to long-time use and high temperature of the water pipe, and the deposition of the scale reduces the heat transfer efficiency and can also cause local corrosion, so that the water pipe is damaged, the working efficiency is reduced, the water flow sectional area is reduced under long-time deposition of the scale, the water flow resistance is increased, and meanwhile, the cleaning operation treatment cost is also increased.

Disclosure of Invention

1. Technical problem to be solved

Aiming at the problems existing in the prior art, the invention aims to provide an energy-saving process of a heat pump evaporation complete equipment, which can realize that when a layer of scale is generated on the inner wall of a water pipe due to the high temperature effect of a heat exchanger, ammonium chloride powder on the inner wall of the water pipe is decomposed into ammonia gas and hydrogen chloride due to heating, an air bag expands to one side of a diaphragm to extrude a deformation saccule, a scale cleaning agent in the air bag is released to clean the scale on the surface of the diaphragm, the air bag only can extrude half of the scale cleaning agent due to the expansion state, a part of the scale cleaning agent still remains in the deformation saccule, when the temperature is reduced, the air bag is retracted, the deformation saccule is reset, and negative pressure effect is caused in the air bag, the scale cleaning agent which is not cleaned up on the scale outside and a small amount of liquid are adsorbed back into the deformation saccule again, so that the next compression of the deformation saccule and the release of the scale cleaning agent are facilitated, a certain amount of released scale cleaning agent is absorbed by the capillary fiber rope, the capillary fiber rope guides the adsorbed scale cleaning agent to the surface of the diaphragm, the cleaning of the scale cleaning agent on the scale is further improved, the expansion saccule is expanded when being influenced by heat, so that a plurality of magnet blocks start to repel each other, and the expansion saccule shakes back and forth in the lantern ring due to the flowability of the liquid and the mutual repulsion of the magnet blocks, so that the efficiency of the flow of the scale cleaning agent in the lantern ring to contact with the scale is increased.

2. Technical proposal

In order to solve the problems, the invention adopts the following technical scheme.

The heat pump evaporation complete equipment energy-saving process comprises the following steps of:

s1, when the vacuum degree in the whole equipment of the vacuum pump reaches-0.097 Mpa, opening a first control valve, automatically feeding raw material liquid into an I-effect evaporator through a preheater under a negative pressure state, and automatically closing when the liquid level of the material liquid in the I-effect evaporator reaches a set liquid level;

s2, starting the vortex compression type heat pump, enabling low-pressure refrigerant steam to be compressed by the vortex compression type heat pump, increasing temperature, pressure and enthalpy value to become high-pressure saturated refrigerant steam, enabling the high-pressure saturated refrigerant steam to enter an I-effect evaporator to conduct heat exchange with feed liquid, enabling moisture in the feed liquid to be continuously vaporized, generating secondary steam, enabling concentration of the feed liquid to be increased, and enabling a scale removal device on the inner wall of a water pipe to clean scale generated in the high temperature in the heat exchange process;

s3, opening a second control valve to enable the feed liquid in the I-effect evaporator to automatically enter the II-effect evaporator in a negative pressure state, wherein the feed liquid level in the II-effect evaporator is raised and raised, meanwhile, the first control valve is opened to automatically supplement the feed liquid in the I-effect evaporator, and when the set feed liquid in the II-effect evaporator is reached, the second control valve is automatically closed and the liquid level balance in the II-effect evaporator is automatically regulated and controlled by the first control valve and the second control valve;

s4, dividing the heat exchange area in the second control valve into two sections: the heating device comprises a section I heating chamber and a section II heating chamber, wherein the heat source of the section I heating chamber is secondary steam generated by an I-effect evaporator, and the heat source of the section II heating chamber is sensible heat of high-pressure refrigeration liquid.

Further, the heat exchange area in the II-effect evaporator in S4 includes the following steps:

s41, carrying out heat exchange between feed liquid entering the II-effect evaporator and secondary steam generated by the I-effect evaporator in the I-section heating chamber, and simultaneously, carrying out secondary heat exchange between the feed liquid and sensible heat of high-pressure refrigerant liquid in the II-section heating chamber, wherein the feed liquid in the II-effect evaporator is continuously vaporized by vapor-liquid two-phase heat energy to generate secondary steam, the concentration of the feed liquid in the II-effect evaporator is continuously increased to be increased, and when the feed liquid reaches the required concentration, starting a concentrate pump to discharge;

s42, performing heat exchange on secondary steam generated by the I-effect evaporator in an I-section heating chamber in the II-effect evaporator, and enabling the heat to be vaporized to form condensate water, wherein the condensate water enters a condensate water tank through a preheater;

s43, secondary steam generated by heat exchange of the heating chamber in the section I and the heating chamber in the section II enters a working medium condenser in a negative pressure state, the secondary steam entering the working medium condenser exchanges heat with low-temperature refrigerant liquid throttled by an electronic throttle valve, after latent heat of the secondary steam is absorbed by the low-temperature refrigerant liquid, the low-temperature refrigerant liquid is changed into low-temperature refrigerant steam, and the secondary steam is condensed into condensed water to enter a condensate water tank and is discharged by a condensate water pump;

s44, after the sensible heat of the high-pressure refrigeration liquid entering the section II heating chamber is absorbed, the temperature is reduced, and the high-pressure refrigeration liquid enters an inlet of the electronic throttle valve after supercooling degree is generated.

Further, the scale removal device in the step S2 comprises a raw material liquid flow water pipe, a lantern ring is fixedly connected to the inner wall of the raw material liquid flow water pipe, a diaphragm is embedded at one end, close to each other, of the lantern ring, an air bag is fixedly connected to the inner bottom end of the lantern ring, ammonium chloride powder is filled in the air bag, a plurality of uniformly distributed deformation sacculus is filled in the lantern ring, the deformation sacculus is positioned at the outer side of the air bag, a plurality of uniformly distributed flow through holes are cut at the outer end of the deformation sacculus, a valve is fixedly connected between the inner walls of the flow through holes, a scale cleaning agent is filled in the deformation sacculus, a plurality of uniformly distributed capillary fiber ropes are fixedly connected to the lower end of the diaphragm, an expansion sacculus is fixedly connected to the lower end of the capillary fiber ropes, a plurality of mutually abutted magnetic insulation powder is arranged in the inner cavity of the expansion sacculus, and a magnet block is arranged in the expansion sacculus, and two mutually symmetrical traction ropes are fixedly connected between the magnet block and the inner wall of the expansion sacculus.

When the heat exchanger generates a layer of scale on the inner wall of the water pipe under the action of high temperature, ammonium chloride powder on the inner wall of the water pipe is decomposed into ammonia gas and hydrogen chloride due to heating, the air bag expands to one side of the diaphragm due to the gradual increase of hydrogen chloride gas, meanwhile, the air bag extrudes the deformed air bag due to the fact that the plurality of deformed air bags are positioned between the air bag and the diaphragm, the scale cleaning agent in the air bag extrudes out of the valve to clean the scale on the surface of the diaphragm, the air bag cannot completely extrude the deformed air bag due to the fixation of the expansion form, only one half of the scale cleaning agent can be extruded, a part of the scale cleaning agent still remains in the deformed air bag, when the temperature is reduced, the air bag is retracted, the deformed air bag is reset, and the inside of the deformed air bag causes a negative pressure effect due to the fact that the deformed air bag is reset, the scale cleaning agent which is not cleaned up on the scale outside and a small amount of liquid are adsorbed back into the deformation saccule again, so that the next compression of the deformation saccule and the release of the scale cleaning agent are facilitated, a certain amount of released scale cleaning agent is absorbed by the capillary fiber rope, the capillary fiber rope guides the adsorbed scale cleaning agent to the surface of the diaphragm, the cleaning of the scale cleaning agent on the scale is further improved, the expansion saccule is expanded when being influenced by heat, mutually abutted magnetic insulation powder in the inner cavity of the expansion saccule is gradually separated to generate gaps, a plurality of mutually exclusive magnet blocks are made to generate magnetism on the outside, and the expansion saccule shakes back and forth in the lantern ring due to the fluidity and the mutual rejection of the liquid, so that the efficiency of flowing and contacting the scale cleaning agent in the lantern ring is increased.

Further, the vacuum pump is respectively communicated with the I-effect evaporator, the II-effect evaporator, the working medium condenser, the preheater and the condensate water tank, and is communicated with a plurality of components through the arrangement, so that the pressure intensity inside each container can be reduced, the vacuum degree is improved, the boiling point of liquid is reduced, and the evaporation speed of the liquid is further improved.

Further, the pressure in the I-effect evaporator is automatically regulated and controlled by a third control valve connected with the II-effect evaporator in series, the pressure in the II-effect evaporator is automatically regulated and controlled by a fourth control valve connected with the working medium condenser in series, and the pressure in the I-effect evaporator and the pressure in the II-effect evaporator can be accurately controlled by arranging independent control valves.

Furthermore, the refrigerant R22 or R410a is adopted as the heating and cooling refrigerant of the scroll compression heat pump, and is injected at one time, and the refrigerant can be permanently recycled by adopting the refrigerant R22 or R410 a.

Further, be provided with self-cleaning system in I effect evaporimeter and the II effect evaporimeter, by PLC program automatic cycle start, accord with the GMP standard requirement, through setting up self-cleaning system, can be more convenient clear up I effect evaporimeter and the interior remaining stock solution of II effect evaporimeter, reduced the cost of labor when improving work efficiency.

Further, the scale cleaning agent is compounded by various active agents, acid salts, organic acids, penetrants and other components, and can be used for rapidly removing scale, rust and other sediments in a dissolved pipeline by adopting the compounding of various components, and meanwhile, a protective film can be formed on the surface of metal to prevent metal corrosion and rapid formation of scale.

Furthermore, the surfaces of the components in contact with the liquid of the I-effect evaporator and the II-effect evaporator are coated with special corrosion-resistant materials, and the special corrosion-resistant materials can prevent the components from being corroded easily in the process of treating sewage containing high chloride or fluoride, so that the service life of the components is prolonged.

3. Advantageous effects

Compared with the prior art, the invention has the advantages that:

according to the scheme, when the heat exchanger generates a layer of scale due to the high temperature effect, ammonium chloride powder on the inner wall of the pipeline is decomposed into ammonia and hydrogen chloride due to heating, the air bag expands to one side of the diaphragm to extrude the deformed saccule, the scale cleaning agent inside the air bag is released to the surface of the diaphragm, the scale cleaning agent is cleaned, the air bag can only extrude by half due to expansion, a part of the scale cleaning agent still remains in the deformed saccule, when the temperature is reduced, the air bag is retracted, the deformed saccule is reset, negative pressure effect is caused inside the deformed saccule, the scale cleaning agent which is not cleaned by the outside and a small amount of liquid are adsorbed back into the deformed saccule again, the next time of compression of the deformed saccule and release of the scale cleaning agent are facilitated, a certain amount of the scale cleaning agent after release is absorbed by the capillary fiber rope, the capillary fiber rope guides the adsorbed scale cleaning agent to the surface of the diaphragm, the scale cleaning agent is further improved, the expanded saccule is influenced by heat, a plurality of magnet blocks are enabled to be mutually repelled when the expanded, and the expanded saccule and the liquid and the fluidity of the magnet block are enabled to be in contact with the scale cleaning agent in a lantern ring.

Drawings

FIG. 1 is a flow chart of the apparatus of the present invention;

FIG. 2 is a schematic view of the structure of the feed-water pipe of the feed-water flow in accordance with the present invention;

FIG. 3 is a schematic cross-sectional view of a feed-water conduit according to the present invention;

FIG. 4 is a schematic structural view of an airbag of the present invention;

FIG. 5 is a schematic view of the structure of a deformed balloon according to the present invention;

FIG. 6 is a schematic view of the structure of a diaphragm of the present invention;

fig. 7 is a schematic structural view of an inflatable balloon of the present invention.

The reference numerals in the figures illustrate:

a 1I-effect evaporator, an E01I section heating chamber, a 2 II-effect evaporator, an E02 II section heating chamber, a 3 electronic throttle valve, a 4-working medium condenser, a 5-concentrate pump, a 6-vortex compression heat pump, a 7-preheater, an 8-condensate water tank, a 9-vacuum pump, a 10-condensate water pump, a 11 first control valve, a 12 second control valve, a 13 third control valve, a 14 fourth control valve, a 15-raw material liquid flow water pipe, a 16-lantern ring, a 17-diaphragm, an 18-gasbag, 19-ammonium chloride powder, a 20-deformation balloon, a 21-flow through hole, a 22-scale cleaning agent, a 23-capillary fiber rope, a 24-expansion balloon, 25-magnetic insulation powder, 26-magnet blocks, a 27-hauling rope and 28 valves.

Detailed Description

The drawings in the embodiments of the present invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only a few embodiments of the present invention; but not all embodiments, are based on embodiments in the present invention; all other embodiments obtained by those skilled in the art without undue burden; all falling within the scope of the present invention.

In the description of the present invention, it should be noted that the positional or positional relationship indicated by the terms such as "upper", "lower", "inner", "outer", "top/bottom", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "configured to," "engaged with," "connected to," and the like are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Examples:

referring to fig. 1-7, the heat pump evaporation plant energy saving process comprises the following steps:

s1, when the vacuum degree in the whole equipment of a vacuum pump 9 reaches-0.097 Mpa, a first control valve 11 is opened, raw material liquid automatically enters the I-effect evaporator 1 through the preheater 7 in a negative pressure state, the liquid level of the material liquid in the I-effect evaporator 1 rises and rises, and when the set liquid level is reached, the first control valve 11 is automatically closed;

s2, starting the vortex compression heat pump 6, so that low-pressure refrigerant steam is compressed by the vortex compression heat pump 6, and then the temperature, the pressure and the enthalpy are increased to become high-pressure saturated refrigerant steam, the high-pressure saturated refrigerant steam enters the I-effect evaporator 1 to exchange heat with feed liquid, water in the feed liquid is continuously vaporized to generate secondary steam, the concentration of the feed liquid is increased, and in the heat exchange process, a scale removal device on the inner wall of a water pipe cleans scale generated in the high temperature;

s3, opening a second control valve 12 to enable the feed liquid in the I-effect evaporator 1 to automatically enter the II-effect evaporator 2 in a negative pressure state, wherein the feed liquid level in the II-effect evaporator 2 is raised and raised, meanwhile, the first control valve 11 is opened to automatically supplement the feed liquid in the I-effect evaporator 1, and when the set liquid level in the II-effect evaporator 2 is reached, the second control valve 12 automatically closes the liquid level balance in the I-effect evaporator 1 and the II-effect evaporator 2 and is automatically regulated and controlled by the first control valve 11 and the second control valve 12;

s4, the heat exchange area in the second control valve 12 is divided into two sections: the heat source of the I-section heating chamber E01 and the II-section heating chamber E02 is secondary steam generated by the I-effect evaporator 1, and the heat source of the II-section heating chamber E02 is sensible heat of high-pressure refrigeration liquid.

Referring to fig. 1 to 7, the heat exchange area in the II-effect evaporator 2 in S4 includes the steps of:

v41, carrying out heat exchange on feed liquid entering the II-effect evaporator 2 and secondary steam generated by the I-effect evaporator 1 in the I-section heating chamber E01, carrying out heat exchange on the sensible heat of the feed liquid and high-pressure refrigerant liquid in the II-section heating chamber E02 again, continuously vaporizing the feed liquid in the II-effect evaporator 2 by vapor-liquid two-phase heat energy to generate secondary steam, continuously increasing the concentration of the feed liquid in the II-effect evaporator 2 and increasing the concentration, and starting the concentrate pump 5 to discharge when the feed liquid reaches the required concentration;

s42, carrying out heat exchange on secondary steam generated by the I-effect evaporator 1 in an I-section heating chamber E01 in the II-effect evaporator 2, and enabling the heat to be vaporized to form condensate water, wherein the condensate water enters a condensate water tank 8 through a preheater 7;

s43, the secondary steam generated by heat exchange of the heating chambers E01 and E02 of the heating chambers I and II enters the working medium condenser 4 in a negative pressure state, the secondary steam entering the working medium condenser 4 exchanges heat with the low-temperature refrigerant liquid throttled by the electronic throttle valve 3, after the latent heat of the secondary steam is absorbed by the low-temperature refrigerant liquid, the low-temperature refrigerant liquid is changed into low-temperature refrigerant steam, and the secondary steam is condensed into condensed water to enter the condensed water tank 8 and is discharged by the condensed water pump 10;

s44, after the sensible heat of the high-pressure refrigeration liquid entering the section II heating chamber E02 is absorbed, the temperature is reduced, and the high-pressure refrigeration liquid enters an inlet of the electronic throttle valve 3 after supercooling degree is generated.

Referring to fig. 2-7, the scale removing device in S2 includes a raw material liquid flow water pipe 15, a collar 16 is fixedly connected to an inner wall of the raw material liquid flow water pipe 15, a diaphragm 17 is embedded at one end of the collar 16 close to each other, an air bag 18 is fixedly connected to an inner bottom end of the collar 16, ammonium chloride powder 19 is filled in the air bag 18, a plurality of uniformly distributed deformation sacculus 20 is filled in the collar 16, the deformation sacculus 20 is positioned outside the air bag 18, a plurality of uniformly distributed flow through holes 21 are cut at an outer end of the deformation sacculus 20, a valve 28 is fixedly connected between inner walls of the flow through holes 21, a scale cleaning agent 22 is filled in the deformation sacculus 20, a plurality of uniformly distributed capillary fiber ropes 23 are fixedly connected to a lower end of the diaphragm 17, an expansion sacculus 24 is fixedly connected to a lower end of the capillary fiber ropes 23, a plurality of mutually abutted magnetic insulation powder 25 is arranged in an inner cavity of the expansion sacculus 24, a magnet block 26 is arranged in the expansion sacculus 24, and two mutually symmetrical traction ropes 27 are fixedly connected between the magnet block 26 and the inner wall of the expansion sacculus 24;

when the heat exchanger generates a layer of scale on the inner wall of the water pipe under the action of high temperature, the ammonium chloride powder 19 on the inner wall of the water pipe is decomposed into ammonia gas and hydrogen chloride under the action of the gradual increase of the hydrogen chloride gas, the air bag 18 expands towards the side of the diaphragm 17, meanwhile, the air bag 18 extrudes the deformed air bag 20 due to the plurality of deformed air bags 20 positioned between the air bag 18 and the diaphragm 17, the scale cleaning agent 22 in the air bag is extruded out of the valve 28 to clean the scale on the surface of the diaphragm 17, the air bag 18 can not completely extrude the deformed air bag 20 due to the fixation of the expansion form, only half of the scale cleaning agent 22 can be extruded, a part of the scale cleaning agent 22 still remains in the deformed air bag 20, when the temperature is reduced, the air bag 18 is retracted, and the deformed air bag 20 is reset, because the deformation saccule 20 is reset and negative pressure effect is caused in the deformation saccule 20, the scale cleaning agent 22 which is not cleaned by the outside and a small amount of liquid are adsorbed back into the deformation saccule 20 again, so that the next compression of the deformation saccule 20 and the release of the scale cleaning agent 22 are facilitated, a certain amount of released scale cleaning agent 22 is absorbed by the capillary fiber rope 23, the capillary fiber rope 23 guides the adsorbed scale cleaning agent 22 to the surface of the diaphragm 17, the cleaning of the scale cleaning agent 22 is further improved, the expansion saccule 24 is expanded while being influenced by heat, mutually abutted magnetic insulation powder 25 in the inner cavity of the expansion saccule is gradually separated to generate gaps, a plurality of mutually repulsive magnet blocks 26 generate magnetism to the outside, the expansion saccule 24 shakes back and forth at the lantern ring 16 due to the fluidity and the mutual repulsive property of the liquid, the efficiency of the scale cleaner 22 flowing in the collar 16 in contact with the scale is increased.

Referring to fig. 1, the vacuum pump 9 is respectively connected with the I-effect evaporator 1, the II-effect evaporator 2, the working medium condenser 4, the preheater 7 and the condensate tank 8, and is connected with a plurality of components, so that the pressure inside each container can be reduced, the vacuum degree is improved, the boiling point of liquid is reduced, and the evaporation rate of liquid is further improved.

Referring to fig. 1, the pressure in the I-effect evaporator 1 is automatically regulated and controlled by a third control valve 13 connected in series with the II-effect evaporator 2, and the pressure in the II-effect evaporator 2 is automatically regulated and controlled by a fourth control valve 14 connected in series with the working medium condenser 4, so that the pressures in the I-effect evaporator 1 and the II-effect evaporator 2 can be controlled more accurately by providing independent control valves.

Referring to fig. 1, the scroll compression heat pump 6 heats and cools the refrigerant with the refrigerant R22 or R410a, and is injected at one time, and the refrigerant can be permanently recycled by using the refrigerant R22 or R410 a.

Please refer to fig. 1, be provided with self-cleaning system in I effect evaporimeter 1 and the II effect evaporimeter 2, by the automatic circulation start of PLC program, accord with GMP standard requirement, through setting up self-cleaning system, can be more convenient clear up I effect evaporimeter 1 and the interior remaining stock solution of II effect evaporimeter 2, reduced the cost of labor when improving work efficiency.

Referring to fig. 1, the scale cleaner 22 is composed of a plurality of active agents, acid salts, organic acids, penetrants, and the like, and by adopting the combination of the plurality of active agents, the scale, rust and other sediments in the dissolved pipeline can be rapidly removed, and meanwhile, a protective film can be formed on the surface of the metal to prevent metal corrosion and rapid formation of scale.

Referring to fig. 1, the surfaces of the components in contact with the liquid of the i-effect evaporator 1 and the II-effect evaporator 2 are coated with special corrosion-resistant materials, and by arranging the special corrosion-resistant materials, the components are not easy to corrode in the process of treating sewage containing high chloride or fluoride, and the service life of the components is prolonged.

The above; is only a preferred embodiment of the present invention; the scope of the invention is not limited in this respect; any person skilled in the art is within the technical scope of the present disclosure; equivalent substitutions or changes are made according to the technical proposal of the invention and the improved conception thereof; are intended to be encompassed within the scope of the present invention.

Claims

1. The heat pump evaporation complete equipment energy-saving process is characterized in that: the method comprises the following steps:

s1, when the vacuum degree in the whole equipment of a vacuum pump (9) reaches-0.097 Mpa, a first control valve (11) is opened, raw material liquid automatically enters an I-effect evaporator (1) through a preheater (7) in a negative pressure state, the liquid level of the material liquid in the I-effect evaporator (1) rises and rises, and when the set liquid level is reached, the first control valve (11) is automatically closed;

s2, starting a vortex compression heat pump (6), enabling low-pressure refrigerant steam to be compressed by the vortex compression heat pump (6), enabling temperature, pressure and enthalpy to be increased, changing the low-pressure refrigerant steam into high-pressure saturated refrigerant steam, enabling the high-pressure saturated refrigerant steam to enter an I-effect evaporator (1) to exchange heat with feed liquid, enabling moisture in the feed liquid to be continuously vaporized, generating secondary steam, enabling concentration of the feed liquid to be increased, and enabling a descaling device on the inner wall of a water pipe to clean scale generated in the high temperature in the heat exchange process;

s3, opening a second control valve (12) to enable feed liquid in the first-effect evaporator (1) to automatically enter the second-effect evaporator (2) under a negative pressure state, wherein the feed liquid level in the second-effect evaporator (2) is raised and raised, meanwhile, the first control valve (11) is opened to automatically supplement the feed liquid in the first-effect evaporator (1), when the set liquid level is reached in the second-effect evaporator (2), the second control valve (12) is automatically closed, and the liquid level balance in the first-effect evaporator (1) and the second-effect evaporator (2) is automatically regulated and controlled by the first control valve (11) and the second control valve (12);

s4, dividing the heat exchange area in the second control valve (12) into two sections: a first-stage heating chamber (E01) and a second-stage heating chamber (E02), wherein the heat source of the first-stage heating chamber (E01) is secondary steam generated by an I-effect evaporator (1), and the heat source of the second-stage heating chamber (E02) is sensible heat of high-pressure liquid;

the scale removal device in S2 includes raw materials liquid flow water pipe (15), raw materials liquid flow water pipe (15) inner wall fixedly connected with lantern ring (16), the one end that lantern ring (16) are close to each other inlays and is equipped with diaphragm (17), the inner bottom fixedly connected with gasbag (18) of lantern ring (16), gasbag (18) intussuseption is filled with ammonium chloride powder (19), the intussuseption of lantern ring (16) is filled with a plurality of evenly distributed deformation sacculus (20), deformation sacculus (20) are located the gasbag (18) outside, deformation sacculus (20) outer end is excavated and is had a plurality of evenly distributed flow through hole (21), fixedly connected with valve (28) between flow through hole (21) inner wall, deformation sacculus (20) intussuseption is filled with scale cleaner (22), a plurality of evenly distributed capillary fiber ropes (23) lower extreme fixedly connected with inflation sacculus (24), inflation sacculus (24) inner chamber is equipped with a plurality of mutually tight deformation sacculus (20), inflation sacculus (24) inner wall and magnet (26) are connected with magnet (27).

2. The heat pump evaporation plant energy saving process according to claim 1, characterized in that: the heat exchange area in the second-effect evaporator (2) in the S4 comprises the following steps:

s41, carrying out heat exchange between feed liquid entering the II-effect evaporator (2) and secondary steam generated by the I-effect evaporator (1) in a section I heating chamber (E01), simultaneously carrying out secondary heat exchange between the feed liquid and sensible heat of high-pressure refrigerant liquid in a section II heating chamber (E02), continuously vaporizing the feed liquid in the II-effect evaporator (2) by vapor-liquid two-phase heat energy to generate secondary steam, continuously increasing the concentration of the feed liquid in the II-effect evaporator (2) to increase, and starting a concentrate pump (5) to discharge when the feed liquid reaches the required concentration;

s42, carrying out heat exchange on secondary steam generated by the first-effect evaporator (1) in a first-stage heating chamber (E01) in the second-effect evaporator (2), vaporizing the heat to obtain condensed water, and enabling the condensed water to enter a condensed water tank (8) through a preheater (7);

s43, secondary steam generated by heat exchange of the heating chambers (E01) and the heating chambers (E02) in the section I enters the working medium condenser (4) under a negative pressure state, the secondary steam entering the working medium condenser (4) exchanges heat with low-temperature refrigerant liquid throttled by the electronic throttle valve (3), after the secondary steam latent heat is absorbed by the low-temperature refrigerant liquid, the low-temperature refrigerant liquid is changed into low-temperature refrigerant steam, and the secondary steam is condensed into condensed water to enter the condensed water tank (8) and is discharged by the condensed water pump (10);

s44, after the sensible heat of the high-pressure refrigeration liquid entering the section II heating chamber (E02) is absorbed, the temperature is reduced, and the high-pressure refrigeration liquid enters an inlet of the electronic throttle valve (3) after supercooling degree is generated.

3. The heat pump evaporation plant energy saving process according to claim 1, characterized in that: the vacuum pump (9) is respectively communicated with the first-effect evaporator (1), the second-effect evaporator (2), the working medium condenser (4), the preheater (7) and the condensate water tank (8).

4. The heat pump evaporation plant energy saving process according to claim 1, characterized in that: the pressure in the first-effect evaporator (1) is automatically regulated and controlled by a third control valve (13) connected in series with the second-effect evaporator (2), and the pressure in the second-effect evaporator (2) is automatically regulated and controlled by a fourth control valve (14) connected in series with the working medium condenser (4).

5. The heat pump evaporation plant energy saving process according to claim 1, characterized in that: the vortex compression type heat pump (6) heats and cools the refrigerant by adopting a refrigerant R22 or R410a, and is injected at one time.

6. The heat pump evaporation plant energy saving process according to claim 1, characterized in that: the automatic cleaning system is arranged in the I-effect evaporator (1) and the II-effect evaporator (2), and is automatically and circularly started by a PLC program, so that the requirements of GMP standards are met.

7. The heat pump evaporation plant energy saving process according to claim 1, characterized in that: the scale cleaner (22) is formulated from a plurality of active agents, acid salts, organic acids and penetrant components.

8. The heat pump evaporation plant energy saving process according to claim 1, characterized in that: the surfaces of the components in contact with the liquid of the first-effect evaporator (1) and the second-effect evaporator (2) are coated with special corrosion-resistant materials.