CN112984851B

CN112984851B - Semi-overlapping type heat pump double-effect evaporation concentration system

Info

Publication number: CN112984851B
Application number: CN202110346137.2A
Authority: CN
Inventors: 张承虎; 姜瑞岳; 姜沈阳; 项敬来; 赵一波
Original assignee: Wenxiong Holding Group Co ltd
Current assignee: Wenxiong Holding Group Co ltd
Priority date: 2021-03-31
Filing date: 2021-03-31
Publication date: 2022-05-10
Anticipated expiration: 2041-03-31
Also published as: CN112984851A

Abstract

A semi-cascade heat pump double-effect evaporation and concentration system relates to the technical field of double-effect evaporation and concentration systems. The double-effect evaporation concentration system is used for solving the problems of high energy consumption and low vacuum degree of the existing double-effect evaporation concentration system. The invention comprises a first compressor, a first throttle expansion valve, a shell-and-tube heat exchanger, a heat pump second condenser, a first-effect evaporation tank, a second-effect evaporation tank, a condensed water collection tank, a first juice steam pipeline, a second juice steam pipeline, a third juice steam pipeline, a total steam exhaust pipeline and a total condensed water pipeline. The semi-cascade heat pump technology principle is utilized, sensible heat and waste heat of the first-effect and second-effect juice steam condensate are deeply recovered, heat waste of the system is reduced to the maximum extent, energy consumption of the system can be effectively reduced, and the saved energy consumption of the system is about 87% of that of cascade refrigeration; meanwhile, the vacuum degree of the system can be improved, the evaporation concentration effect is 3-4 times of the double-effect evaporation concentration effect, the environment is more green, the economic value and the popularization and application value are obvious, and the purpose of energy-saving production can be realized.

Description

Semi-overlapping type heat pump double-effect evaporation concentration system

Technical Field

The invention relates to the technical field of double-effect evaporation and concentration systems, in particular to a semi-cascade heat pump double-effect evaporation and concentration system.

Background

The evaporation concentration is a typical chemical unit operation in industry, and is widely applied to industrial production processes such as pharmacy, milk powder, amino acid, environmental protection water treatment and the like, so that the improvement of the operation efficiency of an evaporation concentration system and the reduction of process energy consumption have important significance. Currently, many plants use conventional dual-effect evaporative concentration systems, in which raw steam is provided from a boiler as a heat source for single-effect evaporation, and cooling water is used to condense the dual-effect juice steam through a water-steam condenser, and the waste heat of the dual-effect juice steam is discharged out of the system. Through system energy conservation analysis and balance calculation, the waste heat discharged by the water-steam condenser is easily found to be almost equal to the supply heat of the raw steam provided by the boiler, namely the heat of the raw steam is wasted, so that the energy consumption of the double-effect evaporation system is higher, and the operation economic cost is higher.

In addition, in order to guarantee the heat transfer effect and the operation stability of the double-effect evaporation system, the double-effect evaporation system needs a higher vacuum degree. Only when the double-effect juice steam condensate is cooled to a lower temperature, the double-effect evaporation system can maintain a higher vacuum degree, but the traditional method generally adopts a cooling tower to provide cooling water, the temperature of the cooling water is higher and unstable (influenced by weather conditions), so that the cooling effect of the water-steam condenser is poor, the outlet temperature of the double-effect juice steam condensate is generally higher and is generally about 40 ℃, and the double-effect evaporation system is difficult to maintain the higher vacuum degree.

The technical problem to be solved by the invention is as follows:

the existing double-effect evaporation concentration system has the defects that waste heat of double-effect juice steam is wasted, the waste heat is not recycled, and the energy consumption of the system is high; the natural cooling water has higher water temperature and is easy to be influenced by weather conditions and unstable, so that the outlet temperature of the condensed water of the double-effect juice steam is higher, the cooling effect of the water-steam condenser is poor, and the vacuum degree is difficult to maintain at a higher level.

The invention adopts the technical scheme for solving the technical problems that:

the invention provides a semi-cascade heat pump double-effect evaporation concentration system which comprises a first compressor, a first throttle expansion valve, a heat pump first condenser, a first evaporation tank, a second evaporation tank, a shell-and-tube heat exchanger, a heat pump second condenser, a first discharge valve, a first feed valve, a second discharge valve, a third feed valve, a third discharge valve, a discharge pump, a second throttle expansion valve, a third throttle expansion valve, a second compressor, a condensate collection tank, a condensate discharge pump, a condensate check valve, a vacuumizing control valve, a vacuum pump, a first feed pipeline, a second feed pipeline, a third feed pipeline, a first discharge pipeline, a second discharge pipeline, a third discharge pipeline, a first juice steam pipeline, a second juice steam pipeline, a third juice steam pipeline, a total exhaust steam pipeline, a total condensate pipeline, a condensate discharge pipeline, a vacuumizing pipeline, a vacuum pump, a heat pump first condenser, a first evaporator, a second evaporator, a shell-and tube heat exchanger, A first refrigerant pipeline, a second refrigerant pipeline, a first intermediate water circulating pipeline, a second intermediate water circulating pipeline, a third intermediate water pipeline, a fourth intermediate water pipeline, a third intermediate water circulating pipeline and a fourth intermediate water circulating pipeline,

the outlet end of the second intermediate water circulation pipeline is connected with the first heat medium inlet end of the shell-and-tube heat exchanger, a first throttle expansion valve is arranged on the second intermediate water circulation pipeline, the first heat medium outlet end of the shell-and-tube heat exchanger is connected with the inlet end of the first compressor, the outlet end of the first compressor is connected with the inlet end of the first intermediate water circulation pipeline, the inlet end of the third intermediate water pipeline is connected with the middle part of the first intermediate water circulation pipeline, the outlet end of the third intermediate water pipeline is connected with the first heat medium inlet end of the first condenser of the heat pump, the first heat medium outlet end of the first condenser of the heat pump is connected with the inlet end of the fourth intermediate water pipeline, the outlet end of the fourth intermediate water pipeline is connected with the middle part of the second intermediate water circulation pipeline, the outlet end of the first intermediate water circulation pipeline is connected with the inlet end of the first evaporation tank, the heat medium outlet end of the first evaporation tank is connected with the inlet end of the second intermediate water circulation pipeline, the outlet end of the third intermediate water circulation pipeline is connected with the second heat medium inlet end of the first condenser of the heat pump, the inlet end of the fourth intermediate water circulation pipeline is connected with the second heat medium outlet end of the first condenser of the heat pump,

a first feeding valve is arranged on the first feeding pipeline, the outlet end of the first feeding pipeline is respectively connected with the inlet end of the second feeding pipeline and the inlet end of the third feeding pipeline, a second feeding valve is arranged on the second feeding pipeline, the outlet end of the second feeding pipeline is connected with the inlet end of the first evaporating pot, a third feeding valve is arranged on the third feeding pipeline, the outlet end of the third feeding pipeline is connected with the inlet end of the second evaporating pot,

the inlet end of the first discharging pipeline is connected with the discharging port end at the bottom of the first evaporating pot, a first discharging valve is arranged on the first discharging pipeline, the outlet end of the first discharging pipeline and the outlet end of the second discharging pipeline are both connected with the inlet end of a third discharging pipeline, the inlet end of the second discharging pipeline is connected with the discharging port end at the bottom of the second evaporating pot, a second discharging valve is arranged on the second discharging pipeline, a third discharging valve, a discharging pump and a discharging system are sequentially arranged on the third discharging pipeline along the flowing direction of a medium, and the outlet end of the third discharging pipeline is discharged from the system,

an air outlet end of the upper part of the first evaporation tank is connected with an inlet end of a first juice steam pipeline, an outlet end of the first juice steam pipeline is connected with a heat medium inlet end of the second evaporation tank, a heat medium outlet end of the second evaporation tank is connected with an inlet end of a third juice steam pipeline, a second throttle expansion valve is arranged on the third juice steam pipeline, the third juice steam pipeline is connected with the middle part of a total dead steam pipeline, an inlet end of the second juice steam pipeline is connected with an air outlet end of the upper part of the second evaporation tank, an outlet end of the second juice steam pipeline is connected with a second heat medium inlet end of a shell-and-tube heat exchanger, a second heat medium outlet end of the shell-and-tube heat exchanger is connected with an inlet end of the total dead steam pipeline, an outlet end of the total dead steam pipeline is connected with a first heat medium inlet end of a second condenser of a heat pump, a first heat medium outlet end of the second condenser of the heat pump is connected with an inlet end of a total condensed water pipeline, an outlet end of the total condensed water collecting tank is connected with a water inlet end of the condensed water collecting tank, the air exhaust end of the upper part of the condensed water collecting tank is connected with the inlet end of a vacuumizing pipeline, a vacuumizing control valve and a vacuum pump are sequentially arranged on the vacuumizing pipeline along the medium flowing direction, the outlet end of the vacuumizing pipeline is evacuated, the liquid outlet end of the lower part of the condensed water collecting tank is connected with a condensed water discharging pipeline, a condensed water discharging pump, a condensed water check valve and a condensed water discharging system are sequentially arranged on the condensed water discharging pipeline along the medium flowing direction,

the outlet end of the first refrigerant pipeline is connected with the second heat medium inlet end of the heat pump second condenser, a third throttling expansion valve is arranged on the first refrigerant pipeline along the medium flowing direction, the heat medium outlet end of the heat pump second condenser is connected with the inlet end of the second refrigerant pipeline, a second compressor is arranged on the second refrigerant pipeline along the medium flowing direction, the outlet end of the second refrigerant pipeline is connected with the third heat medium inlet end of the shell-and-tube heat exchanger, and the third heat medium outlet end of the shell-and-tube heat exchanger is connected with the inlet end of the first refrigerant pipeline.

A semi-overlapping heat pump double-effect evaporation concentration system and a device thereof comprise a first compressor, a first throttle expansion valve, a heat pump first condenser, a first evaporation tank, a second evaporation tank, a shell-and-tube heat exchanger, a heat pump second condenser, a first discharge valve, a first feed valve, a second discharge valve, a third feed valve, a third discharge valve, a discharge pump, a second throttle expansion valve, a third throttle expansion valve, a second compressor, a condensed water collection tank, a condensed water discharge pump, a condensed water check valve, a vacuumizing control valve, a vacuum pump, a first feed pipeline, a second feed pipeline, a third feed pipeline, a first discharge pipeline, a second discharge pipeline, a third discharge pipeline, a first juice steam pipeline, a second juice steam pipeline, a third steam pipeline, a total steam exhaust pipeline, a total condensation pipeline, a water pipe, a vacuum pump, a condenser, a, A condensed water discharge pipeline, a vacuum-pumping pipeline, a first refrigerant pipeline, a second refrigerant pipeline, a first intermediate water circulation pipeline, a second intermediate water circulation pipeline, a third intermediate water pipeline, a fourth intermediate water pipeline, a third intermediate water circulation pipeline, a fourth intermediate water circulation pipeline,

the air outlet end of the upper part of the first evaporation tank is connected with the inlet end of a first juice steam pipeline, the outlet end of the first juice steam pipeline is connected with the heat medium inlet end of a second evaporation tank, the heat medium outlet end of the second evaporation tank is connected with the inlet end of a third juice steam pipeline, a second throttle expansion valve is arranged on the third juice steam pipeline, the third juice steam pipeline is connected with the middle part of a total dead steam pipeline, the inlet end of the second juice steam pipeline is connected with the air outlet end of the upper part of the second evaporation tank, the outlet end of the second juice steam pipeline is converged with the outlet end of the third juice steam pipeline through a tee joint and connected with a shell-and-tube heat exchanger along the medium flowing direction, the outlet end of the second heat medium of the shell-and-tube heat exchanger is connected with the inlet end of the total dead steam pipeline after being connected with the outlet end of the second heat medium of the shell-and-tube heat exchanger, the outlet end of the first heat medium of the second condenser of the heat pump is connected with the inlet end of the total condensation water pipeline, the outlet end of the main condensed water pipeline is connected with the water inlet end of the condensed water collecting tank, the air exhaust end at the upper part of the condensed water collecting tank is connected with the inlet end of the vacuumizing pipeline, the vacuumizing pipeline is sequentially provided with a vacuumizing control valve and a vacuum pump along the medium flowing direction, the outlet end of the vacuumizing pipeline is evacuated, the liquid exhaust end at the lower part of the condensed water collecting tank is connected with a condensed water discharging pipeline, the condensed water discharging pipeline is sequentially provided with a condensed water discharging pump and a condensed water check valve along the medium flowing direction, and the outlet end of the condensed water discharging pipeline is discharged from the system,

A semi-overlapping type heat pump double-effect evaporation concentration system comprises a first compressor, a first throttle expansion valve, a feed pump, a first evaporation tank, a second evaporation tank, a shell-and-tube heat exchanger, a heat pump second condenser, a first discharge valve, a first feed valve, a second discharge valve, a third feed valve, a third discharge valve, a discharge pump, a second throttle expansion valve, a third throttle expansion valve, a second compressor, a condensate collection tank, a condensate discharge pump, a condensate check valve, a vacuumizing control valve, a vacuum pump, a first feed pipeline, a second feed pipeline, a third feed pipeline, a first discharge pipeline, a second discharge pipeline, a third discharge pipeline, a first steam pipeline, a second juice steam pipeline, a third juice steam pipeline, a total steam exhaust pipeline, a total condensate pipeline, a condensate discharge pipeline, a vacuumizing pipeline, a first refrigerant pipeline, a second refrigerant pipeline, a condensate pipeline, a third steam pipeline, a second steam pipeline, a third steam exhaust pipeline, a total condensate discharge pipeline, a vacuum pumping pipeline, a vacuum pipeline, a first refrigerant pipeline, a second expansion valve, a second throttle expansion valve, a third discharge valve, a second discharge valve, a third discharge valve, a vacuum pump, a third discharge valve, a vacuum pump, a second feed valve, a third discharge valve, a second feed valve, a third discharge valve, a vacuum pump, a third exhaust pipe, a second exhaust pipe, a third exhaust pipe, a second exhaust pipe, a third exhaust pipe, a second exhaust pipe, a third exhaust pipe, a second exhaust pipe, A first intermediate water circulation pipeline, a second intermediate water circulation pipeline, a feeding preheater, a main feeding pipeline, a third intermediate water circulation pipeline and a fourth intermediate water circulation pipeline,

the outlet end of the second medium water circulation pipeline is connected with the first heat medium inlet end of the shell-and-tube heat exchanger, a first throttle expansion valve is arranged on the second medium water circulation pipeline, the first heat medium outlet end of the shell-and-tube heat exchanger is connected with the inlet end of the first compressor, the outlet end of the first compressor is connected with the inlet end of the first medium water circulation pipeline, the inlet end of the third medium water circulation pipeline is connected with the middle part of the first medium water circulation pipeline, the outlet end of the third medium water circulation pipeline is connected with the first heat medium inlet end of the feeding preheater, the first heat medium outlet end of the feeding preheater is connected with the inlet end of the fourth medium water circulation pipeline, the outlet end of the fourth medium water circulation pipeline is connected with the middle part of the second medium water circulation pipeline, the outlet end of the first medium water circulation pipeline is connected with the inlet end of the first evaporation tank, the heat medium outlet end of the first evaporation tank is connected with the inlet end of the second medium water circulation pipeline,

the outlet end of the main feeding pipeline is connected with the second heat medium inlet end of the feeding preheater, a feeding pump is arranged on the main feeding pipeline along the medium flowing direction, the second heat medium outlet end of the feeding preheater is connected with the inlet end of the first feeding pipeline, a first feeding valve is arranged on the first feeding pipeline, the outlet end of the first feeding pipeline is respectively connected with the inlet end of the second feeding pipeline and the inlet end of the third feeding pipeline, a second feeding valve is arranged on the second feeding pipeline, the outlet end of the second feeding pipeline is connected with the inlet end of the first evaporating pot, a third feeding valve is arranged on the third feeding pipeline, the outlet end of the third feeding pipeline is connected with the inlet end of the second evaporating pot,

the outlet end of the main feeding pipeline is connected with the inlet end of a second heat medium of a feeding preheater, a feeding pump is arranged on the main feeding pipeline along the flow direction of the medium, the outlet end of the second heat medium of the feeding preheater is connected with the inlet end of a first feeding pipeline, a first feeding valve is arranged on the first feeding pipeline, the outlet end of the first feeding pipeline is respectively connected with the inlet end of the second feeding pipeline and the inlet end of a third feeding pipeline, a second feeding valve is arranged on the second feeding pipeline, the outlet end of the second feeding pipeline is connected with the inlet end of a first evaporation tank, a third feeding valve is arranged on the third feeding pipeline, the outlet end of the third feeding pipeline is connected with the inlet end of the second evaporation tank,

an air outlet end of the upper part of the first evaporation tank is connected with an inlet end of a first juice steam pipeline, an outlet end of the first juice steam pipeline is connected with a heat medium inlet end of the second evaporation tank, a heat medium outlet end of the second evaporation tank is connected with an inlet end of a third juice steam pipeline, a second throttle expansion valve is arranged on the third juice steam pipeline, the third juice steam pipeline is connected with the middle part of a total exhaust steam pipeline, an outlet end of the second juice steam pipeline and an outlet end of the third juice steam pipeline are converged through a tee joint and are connected with a shell-and-tube heat exchanger along the medium flowing direction, the heat medium outlet end of the shell-and-tube heat exchanger is connected with an inlet end of a total exhaust steam pipeline after being connected with an outlet end of the heat medium of the shell-and-tube heat exchanger, an outlet end of the total exhaust steam pipeline is connected with a first heat medium inlet end of a second condenser of a heat pump, a first heat medium outlet end of the second condenser of the heat pump is connected with an inlet end of a total condensation water pipeline, and an outlet end of the total condensation water collection tank is connected with an inlet end of the condensation water collection tank, the air exhaust end of the upper part of the condensed water collecting tank is connected with the inlet end of a vacuumizing pipeline, a vacuumizing control valve and a vacuum pump are sequentially arranged on the vacuumizing pipeline along the medium flowing direction, the outlet end of the vacuumizing pipeline is evacuated, the liquid outlet end of the lower part of the condensed water collecting tank is connected with a condensed water discharging pipeline, a condensed water discharging pump, a condensed water check valve and a condensed water discharging system are sequentially arranged on the condensed water discharging pipeline along the medium flowing direction,

A semi-overlapping type heat pump double-effect evaporation concentration system comprises a first compressor, a first throttle expansion valve, a heat pump first condenser, a first evaporation tank, a second evaporation tank, a shell-and-tube heat exchanger, a heat pump second condenser, a first discharge valve, a first feed valve, a second discharge valve, a third feed valve, a third discharge valve, a first discharge pump, a second throttle expansion valve, a third throttle expansion valve, a second compressor, a first condensate collecting tank, a first condensate discharge pump, a first condensate check valve, a first vacuumizing control valve, a first vacuum pump, a first feed pipeline, a second feed pipeline, a third feed pipeline, a first discharge pipeline, a second discharge pipeline, a third discharge pipeline, a first juice steam pipeline, a second juice steam pipeline, a third steam pipeline, a first total steam exhaust pipeline, a total condensate pipeline, a first condensate discharge pipeline, a second condensate discharge pipeline, a third steam pipeline, a first total exhaust steam pipeline, a total condensate discharge pipeline, a second exhaust steam pipeline, a third exhaust steam pipeline, a second exhaust steam pipeline, a third exhaust steam pipeline, a second exhaust steam pipeline, a third exhaust steam pipeline, a second exhaust steam pipeline, a third exhaust steam pipeline, a second exhaust steam pipeline, a third exhaust steam pipeline, a second exhaust steam pipeline, a third exhaust steam pipeline, a second exhaust steam pipeline, a third steam pipeline, a second exhaust steam pipeline, a third exhaust steam pipeline, a second exhaust steam pipeline, a third steam pipeline, a first vacuum pumping pipeline, a first refrigerant pipeline, a second refrigerant pipeline, a first intermediate water circulating pipeline, a second intermediate water circulating pipeline, a third evaporation tank, a fourth feed valve, a fifth feed valve, a sixth feed valve, a fourth discharge valve, a fifth discharge valve, a sixth discharge valve, a second discharge pump, a fourth throttle expansion valve, a second condensate collection tank, a second condensate discharge pump, a second condensate check valve, a second vacuum control valve, a second vacuum pump, a third intermediate water circulating pipeline, a fourth intermediate water circulating pipeline, a fifth intermediate water circulating pipeline, a sixth intermediate water circulating pipeline, a fourth feed pipeline, a fifth feed pipeline, a sixth feed pipeline, a fourth discharge pipeline, a fifth discharge pipeline, a sixth discharge pipeline, a fourth steam pipeline, a fifth juice steam pipeline, a sixth juice steam pipeline, a second total steam exhaust pipeline, a third steam exhaust pipeline, a fourth steam exhaust steam pipeline, a fifth steam exhaust steam pipeline, a third steam exhaust steam pipeline, a fourth steam exhaust steam pipeline, a fourth exhaust steam pipeline, a fourth exhaust steam pipeline, a fourth exhaust steam pipeline, a third vacuum pump, a fourth exhaust steam pipeline, a third vacuum pump, a fourth exhaust steam pipeline, a fourth exhaust steam pipeline, a third vacuum pump, a fourth exhaust steam pipeline, a third vacuum pump, a fourth exhaust steam pipeline, a third vacuum pump, a fourth exhaust steam pipeline, a third vacuum pump, a fourth exhaust steam pipeline, a fourth vacuum pump, a fourth exhaust steam pipeline, a third vacuum pump, a fourth vacuum pump, A second condensed water discharge pipeline, a second vacuum-pumping pipeline,

the outlet end of the second intermediate water circulation pipeline is connected with the first heat medium inlet end of the shell-and-tube heat exchanger, a first throttle expansion valve is arranged on the second intermediate water circulation pipeline, the first heat medium outlet end of the shell-and-tube heat exchanger is connected with the inlet end of the first compressor, the outlet end of the first compressor is connected with the inlet end of the first intermediate water circulation pipeline, the first intermediate water circulation pipeline is respectively connected with the third intermediate water circulation pipeline and the sixth intermediate water circulation pipeline along the medium flowing direction, the outlet end of the third intermediate water circulation pipeline is connected with the heat medium inlet end of the first evaporation tank, the heat medium outlet end of the first evaporation tank is connected with the inlet end of the fourth intermediate water circulation pipeline, the outlet end of the fifth intermediate water circulation pipeline and the inlet end of the second intermediate water circulation pipeline are connected, the outlet end of the sixth intermediate water circulation pipeline is connected with the heat medium inlet end of the third evaporation tank, the outlet end of the heat medium of the third evaporation tank is connected with the inlet end of a fifth intermediate water circulation pipeline,

the outlet end of the first refrigerant pipeline is connected with the second heat medium inlet end of the second condenser of the heat pump, a third throttling expansion valve is arranged on the first refrigerant pipeline along the medium flowing direction, the heat medium outlet end of the second condenser of the heat pump is connected with the inlet end of the second refrigerant pipeline, a second compressor is arranged on the second refrigerant pipeline along the medium flowing direction, the outlet end of the second refrigerant pipeline is connected with the third heat medium inlet end of the shell-and-tube heat exchanger, the third heat medium outlet end of the shell-and-tube heat exchanger is connected with the inlet end of the first refrigerant pipeline,

an air outlet end of the upper part of the third evaporation tank is connected with an inlet end of a fourth juice steam pipeline, an outlet end of the fourth juice steam pipeline is connected with a heat medium inlet end of the fourth evaporation tank, a heat medium outlet end of the fourth evaporation tank is connected with an inlet end of a sixth juice steam pipeline, an air outlet end of the upper part of the fourth evaporation tank is connected with an inlet end of a fifth juice steam pipeline, an outlet end of the sixth juice steam pipeline, an outlet end of the fifth juice steam pipeline and an inlet end of a second main exhaust steam pipeline are connected, an outlet end of the second main exhaust steam pipeline is connected with an water inlet end of a second condensate collecting tank, an upper opening end of the second condensate collecting tank is connected with an inlet end of a second vacuumizing pipeline, a second vacuumizing control valve and a second vacuum pump are sequentially arranged on the second vacuumizing pipeline along the medium flowing direction, a liquid discharge end of the lower part of the second condensate collecting tank is connected with an air suction end of a second condensate discharge pipeline, a second condensed water discharge pump and a second condensed water check valve are sequentially arranged on the second condensed water discharge pipeline along the medium flowing direction, the outlet end of the second condensed water discharge pipeline is discharged from the system,

a fourth feeding valve is arranged on the fourth feeding pipeline, the outlet end of the fourth feeding pipeline is respectively connected with the inlet end of the fifth feeding pipeline and the inlet end of the sixth feeding pipeline, a fifth feeding valve is arranged on the fifth feeding pipeline, the outlet end of the fifth feeding pipeline is connected with the inlet end of the third evaporating pot, a sixth feeding valve is arranged on the sixth feeding pipeline, the outlet end of the sixth feeding pipeline is connected with the inlet end of the fourth evaporating pot,

the inlet end of a fourth discharging pipeline is connected with the discharging port end at the bottom of the third evaporating pot, a fourth discharging valve is arranged on the fourth discharging pipeline, the outlet end of the fourth discharging pipeline and the outlet end of a fifth discharging pipeline are both connected with the inlet end of a sixth discharging pipeline, the inlet end of the fifth discharging pipeline is connected with the discharging port end at the bottom of the fourth evaporating pot, a fifth discharging valve is arranged on the fifth discharging pipeline, a sixth discharging valve and a second discharging pump are sequentially arranged on the sixth discharging pipeline along the medium flowing direction, and the outlet end of the sixth discharging pipeline is discharged out of the system,

the inlet end of the first discharging pipeline is connected with the discharging port end at the bottom of the first evaporating pot, a first discharging valve is arranged on the first discharging pipeline, the outlet end of the first discharging pipeline and the outlet end of the second discharging pipeline are both connected with the inlet end of the third discharging pipeline, the inlet end of the second discharging pipeline is connected with the discharging port end at the bottom of the second evaporating pot, a second discharging valve is arranged on the second discharging pipeline, a third discharging valve and a discharging pump are sequentially arranged on the third discharging pipeline along the medium flowing direction, and the outlet end of the third discharging pipeline is discharged from the system,

the inlet end of the fourth discharging pipeline is connected with the discharging port end of the bottom of the third evaporating pot, a fourth discharging valve is arranged on the fourth discharging pipeline, the outlet end of the fourth discharging pipeline and the outlet end of the fifth discharging pipeline are both connected with the inlet end of the sixth discharging pipeline, the inlet end of the fifth discharging pipeline is connected with the discharging port end of the bottom of the fourth evaporating pot, a fifth discharging valve is arranged on the fifth discharging pipeline, a sixth discharging valve and a second discharging pump are sequentially arranged on the sixth discharging pipeline along the medium flowing direction, and the outlet end of the sixth discharging pipeline is discharged.

Compared with the prior art, the invention has the beneficial effects that:

(1) the invention applies the semi-overlapping heat pump technology, adds the shell-and-tube heat exchanger which has the effect of the semi-overlapping heat pump into the system, replaces the independent vapor compression refrigeration cycle mode of two to three working temperature areas of overlapping refrigeration, utilizes the shell-and-tube heat exchanger to lead the refrigerant in the second juice vapor pipeline and the second refrigerant pipeline to carry out single-direction heat exchange with the condensed water in the second intermediate water cycle pipeline, utilizes the first-stage heat exchange to realize the effect of the overlapping heat pump technology, compared with the conventional double-effect evaporation concentration system, the invention deeply recycles the sensible heat of the condensed water of the first-effect and the second-effect juice vapor, reduces the heat waste of the system to the maximum extent, and can effectively reduce the energy consumption of the system relative to the overlapping refrigeration which needs a plurality of independent vapor compression refrigeration, saves the energy consumption of the system which is about 87 percent of the overlapping refrigeration, and is more environment-friendly, has remarkable economic value and popularization and application value;

(2) because the multi-effect evaporation system needs high vacuum degree guarantee, the temperature of the exhaust steam condensate needs to be reduced to be low, and because the conventional double-effect evaporation concentration system does not adopt a heat pump or only uses a single-stage heat pump for circulation, a large amount of heat energy is wasted, the temperature of the dead steam condensate is overhigh, the vacuum degree of the system is low, the evaporation and concentration effect is poor, and the invention applies the semi-cascade heat pump principle, the cascade evaporation and the cascade compression realize the cascade recovery of the waste heat of the dead steam and the cascade promotion of the energy quality, and simultaneously effectively reduce the temperature of the condensed water of the dead steam, the performance coefficient of the heat pump circulation system is improved, and the evaporation concentration effect is improved, experiments show that the evaporation concentration effect is 3-4 times of the double-effect evaporation concentration effect, and the product quality can be obviously improved;

(3) through energy quality balance analysis, a large amount of waste heat in the condensed water in the first intermediate water circulation pipeline and the second intermediate water circulation pipeline can be utilized, so that the waste heat utilization, feed preheating and hot water supply aspects of the condensed water are realized by additionally connecting the heat pump, the waste heat of the condensed water is effectively utilized, the cyclic utilization of the self energy in the system is realized, and the waste of energy consumption is reduced; meanwhile, the invention also ensures the energy conservation of the system and the feasibility of the system, and has practical application value.

Drawings

FIG. 1 is a schematic diagram of the overall structure of a first embodiment of the present invention;

FIG. 2 is a schematic diagram of the overall structure of a second embodiment of the present invention;

FIG. 3 is a schematic diagram of the overall structure of a third embodiment of the present invention;

FIG. 4 is a schematic diagram of the overall structure of a fourth embodiment of the present invention;

FIG. 5 is a schematic diagram of the overall structure of a fifth embodiment of the present invention;

FIG. 6 is a schematic diagram of the overall structure of a sixth embodiment of the present invention;

wherein the direction of the arrows indicates the direction of the medium flow.

Description of reference numerals:

a first compressor (1), a first throttle expansion valve (2), a heat pump first condenser (3), a first evaporating pot (4), a second evaporating pot (5), a shell-and-tube heat exchanger (6), a heat pump second condenser (7), a first discharge valve (8), a first feed valve (9), a second feed valve (10), a second discharge valve (11), a third feed valve (12), a third discharge valve (13), a discharge pump (14), a second throttle expansion valve (15), a third throttle expansion valve (16), a second compressor (17), a condensate collecting tank (18), a condensate discharge pump (19), a condensate check valve (20), a vacuumizing control valve (21), a vacuum pump (22), a first feed pipeline (23), a second feed pipeline (24), a third feed pipeline (25), a first discharge pipeline (26), a second discharge pipeline (27), a third discharge pipeline (28), a first juice steam pipeline (29), a second juice steam pipeline (30), a third juice steam pipeline (31), a total steam exhaust pipeline (32), a total condensed water pipeline (33), a condensed water discharge pipeline (34), a vacuumizing pipeline (35), a first refrigerant pipeline (36), a second refrigerant pipeline (37), a first intermediate water circulation pipeline (38), a second intermediate water circulation pipeline (39), a third intermediate water pipeline (40), a fourth intermediate water pipeline (41), a third intermediate water circulation pipeline (42), a fourth intermediate water circulation pipeline (43), a sixth feed valve (44), a fourth discharge valve (45), a fifth discharge valve (46), a sixth discharge valve (47), a second discharge pump (48), a fourth throttle expansion valve (49), a second condensed water collection tank (50), a second condensed water discharge pump (51), a second condensed water check valve (52), a second vacuum-pumping control valve (53), a second vacuum pump (54), a fifth intermediate water circulation line (57), a sixth intermediate water circulation line (58), a fourth feed line (59), a fifth feed line (60), a sixth feed line (61), a fourth discharge line (62), a fifth discharge line (63), a sixth discharge line (64), a fourth juice steam line (65), a fifth juice steam line (66), a sixth juice steam line (67), a second total steam exhaust line (68), a second condensate discharge line (69), a second vacuum-pumping line (70), a feed pump (71), a feed preheater (72), a total feed line (73), a first discharge pump (74), a first condensate collection tank (75), a first condensate discharge pump (76), a first condensate check valve (77), a first vacuum-pumping control valve (78), a first vacuum pump (79), a first total dead steam pipeline (80), a first condensed water discharge pipeline (81), a first vacuumizing pipeline (82), a third evaporation tank (83), a fourth evaporation tank (84), a fourth feeding valve (85) and a fifth feeding valve (86).

Detailed description of the preferred embodiments

The first specific embodiment is as follows: the invention provides a semi-cascade heat pump double-effect evaporation concentration system which comprises a first compressor, a first throttle expansion valve, a heat pump first condenser, a first evaporation tank, a second evaporation tank, a shell-and-tube heat exchanger, a heat pump second condenser, a first discharge valve, a first feed valve, a second discharge valve, a third feed valve, a third discharge valve, a discharge pump, a second throttle expansion valve, a third throttle expansion valve, a second compressor, a condensate collection tank, a condensate discharge pump, a condensate check valve, a vacuumizing control valve, a vacuum pump, a first feed pipeline, a second feed pipeline, a third feed pipeline, a first discharge pipeline, a second discharge pipeline, a third discharge pipeline, a first juice steam pipeline, a second juice steam pipeline, a third steam pipeline, a total steam exhaust steam pipeline, a first steam pipeline, a second steam pipeline, a third steam pipeline, a total steam exhaust pipeline, a second steam pipeline, a third steam exhaust steam pipeline, a second steam exhaust steam pipeline, a third steam pipeline, a second exhaust steam pipeline, a third steam exhaust steam pipeline, a second exhaust steam pipeline, a third exhaust steam pipeline, a second exhaust steam pipe, a third exhaust steam pipe, a second exhaust steam pipe, a third exhaust steam pipe, a second exhaust steam pipe, a third exhaust steam pipe, a second exhaust steam pipe, a third exhaust steam pipe, a second exhaust steam pipe, a third exhaust steam pipe, a second exhaust steam pipe, a third exhaust steam pipe, a second exhaust steam pipe, a third, A main condensed water pipeline, a condensed water discharge pipeline, a vacuum-pumping pipeline, a first refrigerant pipeline, a second refrigerant pipeline, a first intermediate water circulating pipeline, a second intermediate water circulating pipeline, a third intermediate water pipeline, a fourth intermediate water pipeline, a third intermediate water circulating pipeline and a fourth intermediate water circulating pipeline,

The operation principle of the embodiment is as follows:

before the system is started, all communicating valves between the system and the outside are closed, the vacuum pumping control valve is opened including the first feeding valve and the third discharging valve, the vacuum pump is started, the system is pumped by the vacuum pumping pipeline, and when the vacuum degree of the system meets the requirement, the vacuum pumping control valve is closed, and the vacuum pump is stopped.

When the system is started, the first feeding valve, the second feeding valve and the third feeding valve are opened and adjusted, raw material liquid is injected into the first evaporation tank and the second evaporation tank, and secondary juice steam generated by the first evaporation tank and the second evaporation tank is called as dead steam.

The thermodynamic cycle process of the exhaust steam comprises the following steps: taking exhaust steam of 65 ℃ as an example, the exhaust steam of 65 ℃ discharged from the top end of the first evaporation tank enters the second evaporation tank, after heat exchange in the second evaporation tank, the exhaust steam of 50 ℃ discharged from the top of the second evaporation tank enters the shell-and-tube heat exchanger along the second juice steam pipeline for heat exchange, the exhaust steam of 55 ℃ discharged along the third juice steam pipeline passes through the throttle expansion valve and then is converged with the exhaust steam in the second juice steam pipeline and is connected with the total exhaust steam pipeline, the total exhaust steam pipeline is connected with the second condenser of the heat pump, and the exhaust steam transfers all the condensation latent heat to the refrigerant of the heat pump through one-way heat exchange, so that the recovery of the exhaust steam waste heat is realized.

Thermodynamic cycle process of refrigerant: the refrigerant flows in the first refrigerant pipeline and the second refrigerant pipeline, exchanges heat with the exhaust steam in the second condenser of the heat pump, and transfers heat to circulating water in the second intermediate water circulation pipeline in the shell-and-tube heat exchanger, so that the utilization of waste heat in the exhaust steam is realized. The cooling water passes through third intermediary water pipeline, fourth intermediary water pipeline, realizes one-way heat transfer in the first condenser of heat pump, and third intermediary water circulation pipeline, fourth intermediary water circulation pipeline pass through the first condenser of heat pump, draw out unnecessary heat in the circulating water, have realized the effective utilization of heat energy.

Double-effect evaporation and concentration process: the double-effect evaporation and concentration process is similar to the conventional double-effect evaporation and concentration process, and intermediate water vapor heats the raw material liquid in the first evaporation tank to evaporate and concentrate the raw material liquid, wherein the boiling point of the raw material liquid is 65 ℃, and single-effect juice vapor at 65 ℃ is generated. The first juice steam enters the second evaporation tank through the first juice steam pipeline, and the raw material liquid in the second evaporation tank is heated to be evaporated and concentrated, for example, the boiling point is 50 ℃, the second-effect juice steam of 50 ℃ is generated, and simultaneously, the first-effect juice steam is condensed into liquid.

After the raw material liquid in the first evaporating pot or the second evaporating pot is evaporated and concentrated to reach the target concentration, the first discharge valve or the second discharge valve and the third discharge valve are opened, the discharge pump is started, and the up-to-standard concentrated liquid is discharged out of the system.

After the starting is finished, the system and the device can realize the heat recycling under the driving action of the first compressor, the second compressor and the shell-and-tube heat exchanger which plays a role of a semi-cascade heat pump, thereby achieving the purpose of energy conservation.

The invention analyzes the reason of energy saving:

the two main reasons for realizing energy saving are as follows:

firstly, the heat is recycled by utilizing a semi-cascade heat pump principle. In the conventional double-effect evaporation concentration system, waste heat in the exhaust steam is not extracted and utilized by the shell-and-tube heat exchanger and the second condenser of the heat pump, so that heat loss is caused. On the basis of utilizing the heat pump to recover waste heat in the exhaust steam, the invention considers the influence of the temperature difference of the exhaust steam on the energy consumption of the compressor, and adopts the shell-and-tube heat exchanger which can play the role of a semi-cascade heat pump, thereby effectively recovering the waste heat in the exhaust steam. Meanwhile, through energy quality balance analysis of the whole system, the third intermediate water pipeline and the fourth intermediate water pipeline are connected with the first condenser of the heat pump, waste heat in circulating water is recycled again, and waste heat in the system is effectively recycled.

Secondly, the temperature of the exhaust steam condensate is effectively reduced, so that the system achieves higher vacuum degree, and the effect of evaporative concentration is improved. Because the multi-effect evaporation system needs high vacuum degree, the temperature of the steam exhaust condensate needs to be reduced to be low. The conventional double-effect evaporation concentration system does not adopt a heat pump or only uses a single-stage heat pump cycle, so that a large amount of heat energy is wasted, and simultaneously, the temperature of exhaust steam condensate is overhigh, so that the vacuum degree of the system is low, and the evaporation concentration effect is poor. The invention realizes the cascade recovery of the waste steam and the cascade improvement of the energy quality by using the principle of the semi-cascade heat pump and through the cascade evaporation and the cascade compression, simultaneously effectively reduces the temperature of the waste steam condensate water, and improves the performance coefficient of the heat pump circulating system and the effect of evaporation concentration.

The second specific embodiment: referring to fig. 2, the present invention provides a semi-cascade heat pump dual-effect evaporation concentration system, wherein the outlet end of the second juice steam pipeline and the outlet end of the third juice steam pipeline are joined by a tee joint, and are connected with a shell-and-tube heat exchanger along the medium flowing direction, and are connected with a total exhaust steam pipeline after being connected from the heat medium outlet end of the shell-and-tube heat exchanger. Other combinations and connections of this embodiment are the same as those of the embodiment.

The operation principle of the embodiment is as follows: the difference between the first embodiment and the second embodiment is that the outlet end of the second juice steam pipeline and the outlet end of the third juice steam pipeline are converged by a tee joint, which is equivalent to that the exhaust steam in the third juice steam pipeline is subjected to heat exchange in the shell-and-tube heat exchanger, so that the waste heat in the exhaust steam can be more fully recovered.

The third concrete implementation scheme is as follows: referring to fig. 3, a semi-cascade heat pump double-effect evaporation concentration system according to this embodiment includes a first compressor, a first throttle expansion valve, a feed pump, a first evaporation tank, a second evaporation tank, a shell-and-tube heat exchanger, a heat pump second condenser, a first discharge valve, a first feed valve, a second discharge valve, a third feed valve, a third discharge valve, a discharge pump, a second throttle expansion valve, a third throttle expansion valve, a second compressor, a condensed water collection tank, a condensed water discharge pump, a condensed water check valve, a vacuum pumping control valve, a vacuum pump, a first feed pipeline, a second feed pipeline, a third feed pipeline, a first discharge pipeline, a second discharge pipeline, a third discharge pipeline, a first juice steam pipeline, a second juice steam pipeline, a third juice steam pipeline, a total steam exhaust pipeline, a third steam exhaust pipeline, a second steam exhaust steam pipeline, a third steam exhaust steam pipeline, a second steam exhaust steam pipeline, a third steam exhaust steam pipe, a third steam pipe, a fourth steam, A main condensed water pipeline, a condensed water discharge pipeline, a vacuum-pumping pipeline, a first refrigerant pipeline, a second refrigerant pipeline, a first intermediate water circulation pipeline, a second intermediate water circulation pipeline, a feeding preheater, a main feeding pipeline, a third intermediate water circulation pipeline and a fourth intermediate water circulation pipeline,

The operation principle of the embodiment is as follows:

When the system is started, the first feeding valve, the second feeding valve, the third feeding valve and the feeding pump are opened and adjusted, raw material liquid is injected into the first evaporation tank and the second evaporation tank, and secondary juice steam generated by the first evaporation tank and the second evaporation tank is called as dead steam in a unified mode.

Thermodynamic cycle process of refrigerant: the refrigerant flows in the first refrigerant pipeline and the second refrigerant pipeline, exchanges heat with the exhaust steam in the second condenser of the heat pump, and transfers heat to circulating water in the second intermediate water circulation pipeline in the shell-and-tube heat exchanger, so that the waste heat in the exhaust steam is utilized. The cooling water passes through third intermediary hydrologic cycle pipeline, fourth intermediary hydrologic cycle pipeline, realizes one-way heat transfer in the feed preheater, and total feed line is connected with the feed preheater for the feeding is properly preheated, and unnecessary heat is drawed out in the circulating water, has promoted evaporative concentration's efficiency, has realized the effective utilization of heat energy.

Double-effect evaporation and concentration process: the double-effect evaporation and concentration process in the invention is similar to the conventional double-effect evaporation and concentration process, and is briefly described as follows: the raw material liquid in the first evaporation tank is heated by intermediate water vapor to be evaporated and concentrated, for example, the boiling point is 65 ℃, and one-effect juice vapor at 65 ℃ is generated. The first juice steam enters the second evaporation tank through the first juice steam pipeline, and the raw material liquid in the second evaporation tank is heated to be evaporated and concentrated, for example, the boiling point is 50 ℃, the second-effect juice steam of 50 ℃ is generated, and simultaneously, the first-effect juice steam is condensed into liquid.

The fourth specific embodiment: referring to fig. 4, the difference from the third embodiment is that the outlet end of the second juice steam pipeline and the outlet end of the third juice steam pipeline are joined together by a tee, and connected with the shell-and-tube heat exchanger along the medium flowing direction, and connected with the total exhaust steam pipeline after being led out from the heat medium outlet end of the shell-and-tube heat exchanger. Other combinations and connections of this embodiment are the same as those of the third embodiment.

The operation principle of the embodiment is as follows: the difference between the third embodiment and the third embodiment is that the outlet end of the second juice steam pipeline and the outlet end of the third juice steam pipeline are converged by a tee joint, which is equivalent to that the exhaust steam in the third juice steam pipeline is subjected to heat exchange in the shell-and-tube heat exchanger, so that the waste heat in the exhaust steam can be more fully recovered.

The fifth concrete embodiment: referring to fig. 5, the present invention provides a semi-cascade heat pump double-effect evaporation concentration system, which comprises a first compressor, a first throttle expansion valve, a heat pump first condenser, a first evaporation tank, a second evaporation tank, a shell-and-tube heat exchanger, a heat pump second condenser, a first discharge valve, a first feed valve, a second discharge valve, a third feed valve, a third discharge valve, a first discharge pump, a second throttle expansion valve, a third throttle expansion valve, a second compressor, a first condensed water collection tank, a first condensed water discharge pump, a first condensed water check valve, a first vacuum control valve, a first vacuum pump, a first feed pipeline, a second feed pipeline, a third feed pipeline, a first discharge pipeline, a second discharge pipeline, a third discharge pipeline, a first juice vapor pipeline, a second juice vapor pipeline, a third vapor pipeline, a first total exhaust vapor pipeline, a second exhaust vapor pipeline, a third exhaust vapor pipeline, a main condensed water pipeline, a first condensed water discharge pipeline, a first vacuumizing pipeline, a first refrigerant pipeline, a second refrigerant pipeline, a first intermediate water circulation pipeline, a second intermediate water circulation pipeline, a third evaporation tank, a fourth feed valve, a fifth feed valve, a sixth feed valve, a fourth discharge valve, a fifth discharge valve, a sixth discharge valve, a second discharge pump, a fourth throttle expansion valve, a second condensed water collection tank, a second condensed water discharge pump, a second condensed water check valve, a second vacuumizing control valve, a second vacuum pump, a third intermediate water circulation pipeline, a fourth intermediate water circulation pipeline, a fifth intermediate water circulation pipeline, a sixth intermediate water circulation pipeline, a fourth feed pipeline, a fifth feed pipeline, a sixth feed pipeline, a fourth discharge pipeline, a fifth discharge pipeline, a sixth discharge pipeline, a fourth juice vapor pipeline, a fifth vapor pipeline, a fourth condensate vapor pipeline, a fifth condensate vapor discharge pipeline, a third condensate vapor pipeline, a fourth condensate vapor pump, a fourth condensate, A sixth juice steam pipeline, a second total steam exhaust pipeline, a second condensed water discharge pipeline and a second vacuum-pumping pipeline,

The operation principle of the embodiment is as follows:

before the system is started, all communicating valves between the system and the outside are closed, the system comprises a first feeding valve, a third discharging valve, a fourth feeding valve and a sixth discharging valve, a first vacuumizing control valve and a second vacuumizing control valve are opened, a first vacuum pump and a second vacuum pump are started, the system is vacuumized from a first vacuumizing pipeline and a second vacuumizing pipeline, and when the vacuum degree of the system meets the requirement, the first vacuumizing control valve and the second vacuumizing control valve are closed, and the first vacuum pump and the second vacuum pump are stopped.

When the system is started, the first feeding valve, the second feeding valve and the third feeding valve are opened and adjusted, raw material liquid is injected into the first evaporation tank and the second evaporation tank, the fourth feeding valve, the fifth feeding valve and the sixth feeding valve are opened and adjusted, raw material liquid is injected into the third evaporation tank and the fourth evaporation tank, and secondary juice steam generated by the first evaporation tank, the second evaporation tank, the third evaporation tank and the fourth evaporation tank is called as dead steam in a unified mode.

The thermodynamic cycle process of the exhaust steam comprises the following steps: taking exhaust steam of 65 ℃ as an example, the exhaust steam of 65 ℃ discharged from the top end of the first evaporation tank enters the second evaporation tank, after heat exchange in the second evaporation tank, the exhaust steam of 50 ℃ discharged from the top of the second evaporation tank enters the shell-and-tube heat exchanger along the second juice steam pipeline for heat exchange, the exhaust steam of 55 ℃ discharged along the third juice steam pipeline passes through the throttle expansion valve and then is converged with the exhaust steam in the second juice steam pipeline and is connected with the first total exhaust steam pipeline, the first total exhaust steam pipeline is connected with the second condenser of the heat pump, and the exhaust steam transfers all condensation latent heat to the refrigerant of the heat pump through one-way heat exchange, so that the recovery of the exhaust steam waste heat is realized. And after heat exchange is carried out in the fourth evaporation tank, the dead steam at the temperature of 50 ℃ discharged from the top of the fourth evaporation tank is mixed with the dead steam at the temperature of 55 ℃ discharged from the sixth juice steam pipeline along the fifth juice steam pipeline and is connected with a second total dead steam pipeline.

Thermodynamic cycle process of refrigerant: the refrigerant flows in the first refrigerant pipeline and the second refrigerant pipeline, exchanges heat with the exhaust steam in the second condenser of the heat pump, and transfers heat to circulating water in the second intermediate water circulation pipeline in the shell-and-tube heat exchanger, so that the utilization of waste heat in the exhaust steam is realized. The cooling water provides redundant heat in the condensed water for the third evaporation tank and the fourth evaporation tank for concentration and evaporation through the third medium water circulation pipeline, the fourth medium water circulation pipeline and the fifth medium water circulation pipeline, and the effective utilization of heat energy is realized.

Double-effect evaporation and concentration process: the double-effect evaporation and concentration process is similar to the conventional double-effect evaporation and concentration process, and the intermediate water vapor heats the raw material liquid in the first evaporation tank to evaporate and concentrate the raw material liquid, wherein the boiling point of the raw material liquid is 65 ℃, and single-effect juice vapor at 65 ℃ is generated. The first juice steam enters the second evaporation tank through the first juice steam pipeline, and the raw material liquid in the second evaporation tank is heated to be evaporated and concentrated, for example, the boiling point is 50 ℃, the second-effect juice steam of 50 ℃ is generated, and simultaneously, the first-effect juice steam is condensed into liquid. The same applies to the evaporation and concentration processes in the third evaporation tank and the fourth evaporation tank.

After the raw material liquid in the first evaporating pot or the second evaporating pot is evaporated and concentrated to reach the target concentration, the first discharge valve or the second discharge valve and the third discharge valve are opened, the first discharge pump is started, and the up-to-standard concentrated liquid is discharged out of the system. In the same way, after the raw material liquid in the third evaporating pot or the fourth evaporating pot is evaporated and concentrated to reach the target concentration, the fourth discharge valve or the fifth discharge valve and the sixth discharge valve are opened, the second discharge pump is started, and the up-to-standard concentrated liquid is discharged out of the system.

The sixth specific embodiment: with reference to fig. 6, the fifth difference from the fifth embodiment is that the outlet end of the second juice steam pipeline and the outlet end of the third juice steam pipeline are joined together by a tee, and connected to the shell-and-tube heat exchanger along the medium flowing direction, and connected to the first total exhaust steam pipeline after being led out from the heat medium outlet end of the shell-and-tube heat exchanger. The technical features not disclosed in this embodiment are the same as those in the fifth embodiment.

The operation principle of the embodiment is as follows: the difference between the fifth embodiment and the fifth embodiment is that the outlet end of the second juice steam pipeline and the outlet end of the third juice steam pipeline are converged by a tee joint, which is equivalent to that the exhaust steam in the third juice steam pipeline is subjected to heat exchange in the shell-and-tube heat exchanger, so that the waste heat in the exhaust steam can be more fully recovered.

The subject of the embodiments of the invention is a general inventive concept, which is technically interrelated and comprises a plurality of identical or similar specific technical features, thus satisfying the requirement of unity, and being proposed as an application.

Claims

1. The utility model provides a half overlapping formula heat pump economic benefits and social benefits evaporation concentration system which characterized in that: the semi-cascade heat pump double-effect evaporation and concentration system and device comprises a first compressor (1), a first throttle expansion valve (2), a heat pump first condenser (3), a first evaporation tank (4), a second evaporation tank (5), a shell-and-tube heat exchanger (6), a heat pump second condenser (7), a first discharge valve (8), a first feed valve (9), a second feed valve (10), a second discharge valve (11), a third feed valve (12), a third discharge valve (13), a discharge pump (14), a second throttle expansion valve (15), a third throttle expansion valve (16), a second compressor (17), a condensed water collection tank (18), a condensed water discharge pump (19), a condensed water check valve (20), a vacuumizing control valve (21), a vacuum pump (22), a first feed pipeline (23), a second feed pipeline (24), a third feed pipeline (25), A first discharging pipeline (26), a second discharging pipeline (27), a third discharging pipeline (28), a first juice steam pipeline (29), a second juice steam pipeline (30), a third juice steam pipeline (31), a total steam exhaust pipeline (32), a total condensed water pipeline (33), a condensed water discharging pipeline (34), a vacuumizing pipeline (35), a first refrigerant pipeline (36), a second refrigerant pipeline (37), a first intermediate water circulating pipeline (38), a second intermediate water circulating pipeline (39), a third intermediate water pipeline (40), a fourth intermediate water pipeline (41), a third intermediate water circulating pipeline (42) and a fourth intermediate water circulating pipeline (43),

the outlet end of a second intermediate water circulating pipeline (39) is connected with the first heat medium inlet end of the shell-and-tube heat exchanger (6), a first throttle expansion valve (2) is arranged on the second intermediate water circulating pipeline (39), the first heat medium outlet end of the shell-and-tube heat exchanger (6) is connected with the inlet end of a first compressor (1), the outlet end of the first compressor (1) is connected with the inlet end of a first intermediate water circulating pipeline (38), the inlet end of a third intermediate water pipeline (40) is connected with the middle part of the first intermediate water circulating pipeline (38), the outlet end of the third intermediate water pipeline (40) is connected with the first heat medium inlet end of a first condenser (3) of the heat pump, the first heat medium outlet end of the first condenser (3) of the heat pump is connected with the inlet end of a fourth intermediate water pipeline (41), the outlet end of the fourth intermediate water pipeline (41) is connected with the middle part of the second intermediate water circulating pipeline (39), the outlet end of a first intermediate water circulation pipeline (38) is connected with the inlet end of a first evaporation tank (4), the outlet end of a heat medium of the first evaporation tank (4) is connected with the inlet end of a second intermediate water circulation pipeline (39), the outlet end of a third intermediate water circulation pipeline (42) is connected with the second heat medium inlet end of a first condenser (3) of the heat pump, the inlet end of a fourth intermediate water circulation pipeline (43) is connected with the second heat medium outlet end of the first condenser (3) of the heat pump,

a first feeding valve (9) is arranged on the first feeding pipeline (23), the outlet end of the first feeding pipeline (23) is respectively connected with the inlet end of the second feeding pipeline (24) and the inlet end of the third feeding pipeline (25), a second feeding valve (10) is arranged on the second feeding pipeline (24), the outlet end of the second feeding pipeline (24) is connected with the inlet end of the first evaporating pot (4), a third feeding valve (12) is arranged on the third feeding pipeline (25), the outlet end of the third feeding pipeline (25) is connected with the inlet end of the second evaporating pot (5),

the inlet end of a first discharging pipeline (26) is connected with the discharging port end at the bottom of a first evaporating pot (4), a first discharging valve (8) is arranged on the first discharging pipeline (26), the outlet end of the first discharging pipeline (26) and the outlet end of a second discharging pipeline (27) are both connected with the inlet end of a third discharging pipeline (28), the inlet end of the second discharging pipeline (27) is connected with the discharging port end at the bottom of a second evaporating pot (5), a second discharging valve (11) is arranged on the second discharging pipeline (27), a third discharging valve (13) and a discharging pump (14) are sequentially arranged on the third discharging pipeline (28) along the medium flowing direction, and the outlet end of the third discharging pipeline (28) is discharged out of the system,

an air outlet end at the upper part of the first evaporation tank (4) is connected with an inlet end of a first juice steam pipeline (29), an outlet end of the first juice steam pipeline (29) is connected with a heat medium inlet end of the second evaporation tank (5), a heat medium outlet end of the second evaporation tank (5) is connected with an inlet end of a third juice steam pipeline (31), a second throttle expansion valve (15) is arranged on the third juice steam pipeline (31), the third juice steam pipeline (31) is connected with the middle part of a total dead steam pipeline (32), an inlet end of the second juice steam pipeline (30) is connected with an air outlet end at the upper part of the second evaporation tank (5), an outlet end of the second juice steam pipeline (30) is connected with a second heat medium inlet end of a shell-and-tube heat exchanger (6), a second heat medium outlet end of the shell-and-tube heat exchanger (6) is connected with an inlet end of the total dead steam pipeline (32), and an outlet end of the total dead steam pipeline (32) is connected with a first heat medium inlet end of a second condenser (7) of a heat pump, a first heat medium outlet end of a heat pump second condenser (7) is connected with an inlet end of a main condensed water pipeline (33), an outlet end of the main condensed water pipeline (33) is connected with a water inlet end of a condensed water collecting tank (18), an air exhaust end at the upper part of the condensed water collecting tank (18) is connected with an inlet end of a vacuumizing pipeline (35), a vacuumizing control valve (21) and a vacuum pump (22) are sequentially arranged on the vacuumizing pipeline (35) along the medium flowing direction, an outlet end of the vacuumizing pipeline (35) is evacuated, a liquid exhaust end at the lower part of the condensed water collecting tank (18) is connected with a condensed water exhaust pipeline (34), a condensed water exhaust pump (19) and a condensed water check valve (20) are sequentially arranged on the condensed water exhaust pipeline (34) along the medium flowing direction, and an outlet end exhaust system of the condensed water exhaust pipeline (34),

the outlet end of the first refrigerant pipeline (36) is connected with the second heat medium inlet end of the heat pump second condenser (7), a third throttling expansion valve (16) is arranged on the first refrigerant pipeline (36) along the medium flowing direction, the heat medium outlet end of the heat pump second condenser (7) is connected with the inlet end of the second refrigerant pipeline (37), a second compressor (17) is arranged on the second refrigerant pipeline (37) along the medium flowing direction, the outlet end of the second refrigerant pipeline (37) is connected with the third heat medium inlet end of the shell-and-tube heat exchanger (6), and the third heat medium outlet end of the shell-and-tube heat exchanger (6) is connected with the inlet end of the first refrigerant pipeline (36).

2. The utility model provides a half overlapping formula heat pump economic benefits and social benefits evaporation concentration system which characterized in that: the semi-cascade heat pump double-effect evaporation and concentration system and device comprises a first compressor (1), a first throttle expansion valve (2), a heat pump first condenser (3), a first evaporation tank (4), a second evaporation tank (5), a shell-and-tube heat exchanger (6), a heat pump second condenser (7), a first discharge valve (8), a first feed valve (9), a second feed valve (10), a second discharge valve (11), a third feed valve (12), a third discharge valve (13), a discharge pump (14), a second throttle expansion valve (15), a third throttle expansion valve (16), a second compressor (17), a condensed water collection tank (18), a condensed water discharge pump (19), a condensed water check valve (20), a vacuumizing control valve (21), a vacuum pump (22), a first feed pipeline (23), a second feed pipeline (24), a third feed pipeline (25), A first discharging pipeline (26), a second discharging pipeline (27), a third discharging pipeline (28), a first juice steam pipeline (29), a second juice steam pipeline (30), a third juice steam pipeline (31), a total steam exhaust pipeline (32), a total condensed water pipeline (33), a condensed water discharging pipeline (34), a vacuumizing pipeline (35), a first refrigerant pipeline (36), a second refrigerant pipeline (37), a first intermediate water circulating pipeline (38), a second intermediate water circulating pipeline (39), a third intermediate water pipeline (40), a fourth intermediate water circulating pipeline (41), a third intermediate water circulating pipeline (42) and a fourth intermediate water circulating pipeline (43),

an air outlet end at the upper part of the first evaporation tank (4) is connected with an inlet end of a first juice steam pipeline (29), an outlet end of the first juice steam pipeline (29) is connected with a heat medium inlet end of the second evaporation tank (5), a heat medium outlet end of the second evaporation tank (5) is connected with an inlet end of a third juice steam pipeline (31), a second throttle expansion valve (15) is arranged on the third juice steam pipeline (31), the third juice steam pipeline (31) is connected with the middle part of a total exhaust steam pipeline (32), an inlet end of the second juice steam pipeline (30) is connected with an air outlet end at the upper part of the second evaporation tank (5), an outlet end of the second juice steam pipeline (30) is converged with an outlet end of the third juice steam pipeline (31) through a tee joint and is connected with the shell-and tube heat exchanger (6) along the medium flowing direction, and is connected with an inlet end of the total exhaust steam pipeline (32) after being connected with a second heat medium outlet end of the shell-and tube heat exchanger (6), the outlet end of a main steam exhaust pipeline (32) is connected with the first heat medium inlet end of a heat pump second condenser (7), the first heat medium outlet end of the heat pump second condenser (7) is connected with the inlet end of a main condensed water pipeline (33), the outlet end of the main condensed water pipeline (33) is connected with the water inlet end of a condensed water collecting tank (18), the air exhaust end of the upper part of the condensed water collecting tank (18) is connected with the inlet end of a vacuumizing pipeline (35), a vacuumizing control valve (21) and a vacuum pump (22) are sequentially arranged on the vacuumizing pipeline (35) along the medium flowing direction, the outlet end of the vacuumizing pipeline (35) is evacuated, the liquid exhaust end of the lower part of the condensed water collecting tank (18) is connected with a condensed water discharging pipeline (34), and a condensed water discharging pump (19) and a condensed water reverse stopping valve (20) are sequentially arranged on the condensed water discharging pipeline (34) along the medium flowing direction, the outlet end of the condensed water discharge pipeline (34) is discharged out of the system,

3. The utility model provides a half overlapping formula heat pump economic benefits and social benefits evaporation concentration system which characterized in that: the semi-cascade heat pump double-effect evaporation and concentration system and device comprise a first compressor (1), a first throttle expansion valve (2), a feeding pump (71), a first evaporation tank (4), a second evaporation tank (5), a shell-and-tube heat exchanger (6), a heat pump second condenser (7), a first discharge valve (8), a first feeding valve (9), a second feeding valve (10), a second discharge valve (11), a third feeding valve (12), a third discharge valve (13), a discharge pump (14), a second throttle expansion valve (15), a third throttle expansion valve (16), a second compressor (17), a condensed water collecting tank (18), a condensed water discharge pump (19), a condensed water check valve (20), a vacuum pumping control valve (21), a vacuum pump (22), a first feeding pipeline (23), a second feeding pipeline (24), a third feeding pipeline (25), A first discharging pipeline (26), a second discharging pipeline (27), a third discharging pipeline (28), a first juice steam pipeline (29), a second juice steam pipeline (30), a third juice steam pipeline (31), a total steam exhaust pipeline (32), a total condensed water pipeline (33), a condensed water discharging pipeline (34), a vacuumizing pipeline (35), a first refrigerant pipeline (36), a second refrigerant pipeline (37), a first intermediate water circulating pipeline (38), a second intermediate water circulating pipeline (39), a feeding preheater (72), a total feeding pipeline (73), a third intermediate water circulating pipeline (42) and a fourth intermediate water circulating pipeline (43),

the outlet end of a second intermediate water circulating pipeline (39) is connected with the first heat medium inlet end of the shell-and-tube heat exchanger (6), a first throttle expansion valve (2) is arranged on the second intermediate water circulating pipeline (39), the first heat medium outlet end of the shell-and-tube heat exchanger (6) is connected with the inlet end of a first compressor (1), the outlet end of the first compressor (1) is connected with the inlet end of a first intermediate water circulating pipeline (38), the inlet end of a third intermediate water circulating pipeline (42) is connected with the middle part of the first intermediate water circulating pipeline (38), the outlet end of the third intermediate water circulating pipeline (42) is connected with the first heat medium inlet end of a feeding preheater (72), the first heat medium outlet end of the feeding preheater (72) is connected with the inlet end of a fourth intermediate water circulating pipeline (43), the outlet end of the fourth intermediate water circulating pipeline (43) is connected with the middle part of the second intermediate water circulating pipeline (39), the outlet end of the first intermediate water circulation pipeline (38) is connected with the inlet end of the first evaporation tank (4), the outlet end of the heat medium of the first evaporation tank (4) is connected with the inlet end of the second intermediate water circulation pipeline (39),

the outlet end of a main feeding pipeline (73) is connected with the second heat medium inlet end of a feeding preheater (72), a feeding pump (71) is arranged on the main feeding pipeline (73) along the medium flowing direction, the second heat medium outlet end of the feeding preheater (72) is connected with the inlet end of a first feeding pipeline (23), a first feeding valve (9) is arranged on the first feeding pipeline (23), the outlet end of the first feeding pipeline (23) is respectively connected with the inlet end of a second feeding pipeline (24) and the inlet end of a third feeding pipeline (25), a second feeding valve (10) is arranged on the second feeding pipeline (24), the outlet end of the second feeding pipeline (24) is connected with the feeding port end of a first evaporation tank (4), a third feeding valve (12) is arranged on the third feeding pipeline (25), the outlet end of the third feeding pipeline (25) is connected with the feeding port end of a second evaporation tank (5),

4. The utility model provides a half overlapping formula heat pump economic benefits and social benefits evaporation concentration system which characterized in that: the semi-cascade heat pump double-effect evaporation and concentration system and device comprise a first compressor (1), a first throttle expansion valve (2), a feeding pump (71), a first evaporation tank (4), a second evaporation tank (5), a shell-and-tube heat exchanger (6), a heat pump second condenser (7), a first discharge valve (8), a first feeding valve (9), a second feeding valve (10), a second discharge valve (11), a third feeding valve (12), a third discharge valve (13), a discharge pump (14), a second throttle expansion valve (15), a third throttle expansion valve (16), a second compressor (17), a condensed water collecting tank (18), a condensed water discharge pump (19), a condensed water check valve (20), a vacuum pumping control valve (21), a vacuum pump (22), a first feeding pipeline (23), a second feeding pipeline (24), a third feeding pipeline (25), A first discharging pipeline (26), a second discharging pipeline (27), a third discharging pipeline (28), a first juice steam pipeline (29), a second juice steam pipeline (30), a third juice steam pipeline (31), a total steam exhaust pipeline (32), a total condensed water pipeline (33), a condensed water discharging pipeline (34), a vacuumizing pipeline (35), a first refrigerant pipeline (36), a second refrigerant pipeline (37), a first intermediate water circulating pipeline (38), a second intermediate water circulating pipeline (39), a feeding preheater (72), a total feeding pipeline (73), a third intermediate water circulating pipeline (42) and a fourth intermediate water circulating pipeline (43),

an air outlet end at the upper part of the first evaporation tank (4) is connected with an inlet end of a first juice steam pipeline (29), an outlet end of the first juice steam pipeline (29) is connected with a heat medium inlet end of the second evaporation tank (5), a heat medium outlet end of the second evaporation tank (5) is connected with an inlet end of a third juice steam pipeline (31), a second throttle expansion valve (15) is arranged on the third juice steam pipeline (31), the third juice steam pipeline (31) is connected with the middle part of a total exhaust steam pipeline (32), an outlet end of the second juice steam pipeline (30) is converged with an outlet end of the third juice steam pipeline (31) through a tee joint and is connected with a shell-and-tube heat exchanger (6) along the medium flowing direction, the outlet end of the heat medium of the shell-and-tube heat exchanger (6) is connected with an inlet end of the total exhaust steam pipeline (32), an outlet end of the total exhaust steam pipeline (32) is connected with a first heat medium inlet end of a second condenser (7) of the heat pump, a first heat medium outlet end of a heat pump second condenser (7) is connected with an inlet end of a main condensed water pipeline (33), an outlet end of the main condensed water pipeline (33) is connected with a water inlet end of a condensed water collecting tank (18), an air exhaust end at the upper part of the condensed water collecting tank (18) is connected with an inlet end of a vacuumizing pipeline (35), a vacuumizing control valve (21) and a vacuum pump (22) are sequentially arranged on the vacuumizing pipeline (35) along the medium flowing direction, an outlet end of the vacuumizing pipeline (35) is evacuated, a liquid exhaust end at the lower part of the condensed water collecting tank (18) is connected with a condensed water exhaust pipeline (34), a condensed water exhaust pump (19) and a condensed water check valve (20) are sequentially arranged on the condensed water exhaust pipeline (34) along the medium flowing direction, and an outlet end exhaust system of the condensed water exhaust pipeline (34),

5. The utility model provides a half overlapping formula heat pump economic benefits and social benefits evaporation concentration system which characterized in that: the semi-cascade heat pump double-effect evaporation and concentration system and device comprise a first compressor (1), a first throttle expansion valve (2), a heat pump first condenser (3), a first evaporation tank (4), a second evaporation tank (5), a shell-and-tube heat exchanger (6), a heat pump second condenser (7), a first discharge valve (8), a first feed valve (9), a second feed valve (10), a second discharge valve (11), a third feed valve (12), a third discharge valve (13), a first discharge pump (74), a second throttle expansion valve (15), a third throttle expansion valve (16), a second compressor (17), a first condensed water collection tank (75), a first condensed water discharge pump (76), a first condensed water check valve (77), a first vacuumizing control valve (78), a first vacuum pump (79), a first feed pipeline (23), a second feed pipeline (24), A third feeding pipeline (25), a first discharging pipeline (26), a second discharging pipeline (27), a third discharging pipeline (28), a first juice steam pipeline (29), a second juice steam pipeline (30), a third juice steam pipeline (31), a first total exhaust steam pipeline (80), a total condensed water pipeline (33), a first condensed water discharging pipeline (81), a first vacuumizing pipeline (82), a first refrigerant pipeline (36), a second refrigerant pipeline (37), a first intermediate water circulating pipeline (38), a second intermediate water circulating pipeline (39), a third evaporating tank (83), a fourth evaporating tank (84), a fourth feeding valve (85), a fifth feeding valve (86), a sixth feeding valve (44), a fourth discharging valve (45), a fifth discharging valve (46), a sixth discharging valve (47), a second discharging pump (48), a fourth throttle expansion valve (49), a second condensed water tank (50), A second condensed water discharge pump (51), a second condensed water check valve (52), a second vacuum control valve (53), a second vacuum pump (54), a third intermediate water circulation pipeline (42), a fourth intermediate water circulation pipeline (43), a fifth intermediate water circulation pipeline (57), a sixth intermediate water circulation pipeline (58), a fourth feed pipeline (59), a fifth feed pipeline (60), a sixth feed pipeline (61), a fourth discharge pipeline (62), a fifth discharge pipeline (63), a sixth discharge pipeline (64), a fourth juice steam pipeline (65), a fifth juice steam pipeline (66), a sixth juice steam pipeline (67), a second total steam exhaust pipeline (68), a second condensed water discharge pipeline (69) and a second vacuum pipeline (70),

the outlet end of a second intermediate water circulation pipeline (39) is connected with the first heat medium inlet end of the shell-and-tube heat exchanger (6), a first throttle expansion valve (2) is arranged on the second intermediate water circulation pipeline (39), the first heat medium outlet end of the shell-and-tube heat exchanger (6) is connected with the inlet end of a first compressor (1), the outlet end of the first compressor (1) is connected with the inlet end of a first intermediate water circulation pipeline (38), the first intermediate water circulation pipeline (38) is respectively connected with a third intermediate water circulation pipeline (42) and a sixth intermediate water circulation pipeline (58) along the medium flowing direction, the outlet end of the third intermediate water circulation pipeline (42) is connected with the heat medium inlet end of a first evaporation tank (4), the heat medium outlet end of the first evaporation tank (4) is connected with the inlet end of a fourth intermediate water circulation pipeline (43), the outlet end of the fourth intermediate water circulation pipeline (43), The outlet end of a fifth intermediate water circulating pipeline (57) is connected with the inlet end of a second intermediate water circulating pipeline (39), the outlet end of a sixth intermediate water circulating pipeline (58) is connected with the heat medium inlet end of a third evaporation tank (83), the heat medium outlet end of the third evaporation tank (83) is connected with the inlet end of the fifth intermediate water circulating pipeline (57),

the outlet end of the first refrigerant pipeline (36) is connected with the second heat medium inlet end of the heat pump second condenser (7), a third throttling expansion valve (16) is arranged on the first refrigerant pipeline (36) along the medium flowing direction, the heat medium outlet end of the heat pump second condenser (7) is connected with the inlet end of the second refrigerant pipeline (37), a second compressor (17) is arranged on the second refrigerant pipeline (37) along the medium flowing direction, the outlet end of the second refrigerant pipeline (37) is connected with the third heat medium inlet end of the shell-and-tube heat exchanger (6), the third heat medium outlet end of the shell-and-tube heat exchanger (6) is connected with the inlet end of the first refrigerant pipeline (36),

an air outlet end at the upper part of the third evaporation tank (83) is connected with an inlet end of a fourth juice steam pipeline (65), an outlet end of the fourth juice steam pipeline (65) is connected with a heat medium inlet end of a fourth evaporation tank (84), a heat medium outlet end of the fourth evaporation tank (84) is connected with an inlet end of a sixth juice steam pipeline (67), an air outlet end at the upper part of the fourth evaporation tank (84) is connected with an inlet end of a fifth juice steam pipeline (66), an outlet end of the sixth juice steam pipeline (67), an outlet end of the fifth juice steam pipeline (66) and an inlet end of a second total exhaust steam pipeline (68), an outlet end of the second total exhaust steam pipeline (68) is connected with an water inlet end of a second condensation water collection tank (50), an air exhaust end at the upper part of the second condensation water collection tank (50) is connected with an inlet end of a second vacuum pumping pipeline (70), and a second vacuum pumping control valve (53) and a second vacuum pump (54) are sequentially arranged on the second vacuum pumping pipeline (70) along the medium flowing direction, a liquid discharge end at the lower part of the second condensed water collecting tank (50) is connected with an inlet end of a second condensed water discharge pipeline (69), a second condensed water discharge pump (51) and a second condensed water check valve (52) are sequentially arranged on the second condensed water discharge pipeline (69) along the medium flowing direction, and an outlet end discharge system of the second condensed water discharge pipeline (69),

a fourth feeding valve (85) is arranged on the fourth feeding pipeline (59), the outlet end of the fourth feeding pipeline (59) is respectively connected with the inlet end of the fifth feeding pipeline (60) and the inlet end of the sixth feeding pipeline (61), a fifth feeding valve (86) is arranged on the fifth feeding pipeline (60), the outlet end of the fifth feeding pipeline (60) is connected with the inlet end of the third evaporation tank (83), a sixth feeding valve (44) is arranged on the sixth feeding pipeline (61), the outlet end of the sixth feeding pipeline (61) is connected with the inlet end of the fourth evaporation tank (84),

the inlet end of a fourth discharging pipeline (62) is connected with the discharging port end at the bottom of a third evaporating pot (83), a fourth discharging valve (45) is arranged on the fourth discharging pipeline (62), the outlet end of the fourth discharging pipeline (62) and the outlet end of a fifth discharging pipeline (63) are both connected with the inlet end of a sixth discharging pipeline (64), the inlet end of the fifth discharging pipeline (63) is connected with the discharging port end at the bottom of the fourth evaporating pot (84), a fifth discharging valve (46) is arranged on the fifth discharging pipeline (63), a sixth discharging valve (47) and a second discharging pump (48) are sequentially arranged on the sixth discharging pipeline (64) along the medium flowing direction, and the outlet end of the sixth discharging pipeline (64) is discharged out of the system.

6. The utility model provides a half overlapping formula heat pump economic benefits and social benefits evaporation concentration system which characterized in that: the semi-cascade heat pump double-effect evaporation and concentration system and device comprise a first compressor (1), a first throttle expansion valve (2), a heat pump first condenser (3), a first evaporation tank (4), a second evaporation tank (5), a shell-and-tube heat exchanger (6), a heat pump second condenser (7), a first discharge valve (8), a first feed valve (9), a second feed valve (10), a second discharge valve (11), a third feed valve (12), a third discharge valve (13), a first discharge pump (74), a second throttle expansion valve (15), a third throttle expansion valve (16), a second compressor (17), a first condensed water collection tank (75), a first condensed water discharge pump (76), a first condensed water check valve (77), a first vacuumizing control valve (78), a first vacuum pump (79), a first feed pipeline (23), a second feed pipeline (24), A third feeding pipeline (25), a first discharging pipeline (26), a second discharging pipeline (27), a third discharging pipeline (28), a first juice steam pipeline (29), a second juice steam pipeline (30), a third juice steam pipeline (31), a first total exhaust steam pipeline (80), a total condensed water pipeline (33), a first condensed water discharging pipeline (81), a first vacuumizing pipeline (82), a first refrigerant pipeline (36), a second refrigerant pipeline (37), a first intermediate water circulating pipeline (38), a second intermediate water circulating pipeline (39), a third evaporating tank (83), a fourth evaporating tank (84), a fourth feeding valve (85), a fifth feeding valve (86), a sixth feeding valve (44), a fourth discharging valve (45), a fifth discharging valve (46), a sixth discharging valve (47), a second discharging pump (48), a fourth throttle expansion valve (49), a second condensed water tank (50), A second condensed water discharge pump (51), a second condensed water check valve (52), a second vacuum control valve (53), a second vacuum pump (54), a third intermediate water circulation pipeline (42), a fourth intermediate water circulation pipeline (43), a fifth intermediate water circulation pipeline (57), a sixth intermediate water circulation pipeline (58), a fourth feed pipeline (59), a fifth feed pipeline (60), a sixth feed pipeline (61), a fourth discharge pipeline (62), a fifth discharge pipeline (63), a sixth discharge pipeline (64), a fourth juice steam pipeline (65), a fifth juice steam pipeline (66), a sixth juice steam pipeline (67), a second total steam exhaust pipeline (68), a second condensed water discharge pipeline (69) and a second vacuum pipeline (70),

an air outlet end at the upper part of the first evaporation tank (4) is connected with an inlet end of a first juice steam pipeline (29), an outlet end of the first juice steam pipeline (29) is connected with a heat medium inlet end of the second evaporation tank (5), a heat medium outlet end of the second evaporation tank (5) is connected with an inlet end of a third juice steam pipeline (31), a second throttle expansion valve (15) is arranged on the third juice steam pipeline (31), the third juice steam pipeline (31) is connected with the middle part of a total exhaust steam pipeline (32), an inlet end of the second juice steam pipeline (30) is connected with an air outlet end at the upper part of the second evaporation tank (5), an outlet end of the second juice steam pipeline (30) is converged with an outlet end of the third juice steam pipeline (31) through a tee joint and is connected with the shell-tube heat exchanger (6) along the medium flowing direction, and is connected with an inlet end of the first total exhaust steam pipeline (32) after being connected from a heat medium outlet end of the shell-tube heat exchanger (6), the outlet end of a main steam exhaust pipeline (32) is connected with the first heat medium inlet end of a heat pump second condenser (7), the first heat medium outlet end of the heat pump second condenser (7) is connected with the inlet end of a main condensed water pipeline (33), the outlet end of the main condensed water pipeline (33) is connected with the water inlet end of a condensed water collecting tank (18), the air exhaust end of the upper part of the condensed water collecting tank (18) is connected with the inlet end of a vacuumizing pipeline (35), a vacuumizing control valve (21) and a vacuum pump (22) are sequentially arranged on the vacuumizing pipeline (35) along the medium flowing direction, the outlet end of the vacuumizing pipeline (35) is evacuated, the liquid exhaust end of the lower part of the condensed water collecting tank (18) is connected with a condensed water discharging pipeline (34), and a condensed water discharging pump (19) and a condensed water reverse stopping valve (20) are sequentially arranged on the condensed water discharging pipeline (34) along the medium flowing direction, the outlet end of the condensed water discharge pipeline (34) is discharged out of the system,