CN218544877U

CN218544877U - Carbon dioxide refrigerating and heating and negative-pressure defrosting water recovery integrated system of freeze dryer

Info

Publication number: CN218544877U
Application number: CN202222690540.XU
Authority: CN
Inventors: 王佳文
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-10-12
Filing date: 2022-10-12
Publication date: 2023-02-28
Anticipated expiration: 2032-10-12

Abstract

The utility model relates to a freeze dryer carbon dioxide refrigeration heating and negative pressure defrosting water recovery complete system, which comprises a gas cooler of a carbon dioxide heating part, a heating plate group, a heat medium pump and the like; a low-circulation barrel, a refrigerant pump, a cold trap, an air cooler and the like of the carbon dioxide refrigerating part; supercooling of the common portion, and the like; a negative pressure steam generator, a drainage pump, a recovery water tank and the like of the negative pressure defrosting water recovery part. The method is characterized in that a green environment-friendly working medium is selected, a carbon dioxide transcritical circulation technology is adopted, the excellent low-temperature refrigeration performance and transcritical temperature slippage heat exchange characteristic of carbon dioxide are fully utilized, the effect that the COP is more than 1 in reverse Carnot circulation refrigeration heating is exerted, the freeze-drying refrigeration heating process is combined into a whole, heating equipment with the COP less than 1 and power consumption are saved, and the super effect that the COP is more than 6 is generated; by adopting the negative pressure defrosting technology, the low-quality heat source of the system is fully utilized, the complete recovery of pure plant raw material water is realized, and the utilization rate of the raw material is close to 100 percent.

Description

Carbon dioxide refrigerating and heating and negative-pressure defrosting water recovery integrated system for freeze dryer

Technical Field

The invention belongs to an energy-saving and environment-friendly comprehensive utilization system of a freeze dryer, and particularly relates to a complete system for refrigerating and heating carbon dioxide and recovering negative-pressure defrosting water of the freeze dryer.

Background

Along with the development of society, the progress of times and the improvement of living standard of people, the food industry is advancing towards the direction of nutrition, health care, convenience, rapidness, green and environmental protection. In recent years, purely natural food freeze-drying technology which has high quality guarantee, easy storage and transportation and ecological health is favored, and has attracted extensive attention of the food industry; but the method has the fatal defects of high energy consumption (3 to 5 times of drying), low yield (more than 80 percent of water loss of fruit and vegetable raw materials), environmental pollution (the CWP of a refrigeration working medium is more than 1000, and discharge is caused by heating and defrosting), and also greatly hinders the popularization and application of the high-end drying process. Especially under the new double-circulation pattern of 'country joyful, green development, double-carbon emission reduction and industrial upgrading', the traditional freeze dryer saves energy, reduces consumption, is green and environment-friendly, improves the utilization rate of raw materials, and is a critical urgent need to be solved. The invention adopts green environment-friendly working medium CO ₂ Novel CO ₂ The transcritical refrigeration and heating parallel technology combines the freeze-drying refrigeration and heating processes into a whole, saves heating equipment with COP less than 1 and power consumption, and further generates the super effect of comprehensive COP more than 6; the utilization rate of the raw materials is close to 100% by adopting a negative pressure defrosting water recycling comprehensive utilization technology, so that the energy-saving environment-friendly comprehensive utilization of the freeze dryer is revolutionarily improved.

The food freeze-drying technology is that after the water-containing material is quick-frozen, it is heated in vacuum environment to make the ice crystal in the material directly sublimate so as to obtain the dried product. In the process of freeze-drying food, materials must be subjected to two extremely energy-consuming cold and hot processes of deep quick freezing and heating sublimation, so that the unit dehydration energy consumption index of the traditional freeze-drying equipment is a key place where the food freeze-drying process is difficult to be generally applied; in addition, the freeze-dried fruits and vegetables lose more than 80% of the raw material moisture, and are unacceptable to common food manufacturers. Therefore, on the basis of deep analysis and calculation and theoretical practice of a freeze-drying process and matched equipment, a complete system for carbon dioxide transcritical refrigeration heating and negative pressure defrosting water recovery of a freeze-dryer is designed, the excellent low-temperature refrigeration performance and transcritical temperature slippage heat exchange characteristic of carbon dioxide are fully utilized, the effect that the COP (coefficient of performance) of reverse Carnot cycle refrigeration heating is more than 1 is exerted, the freeze-drying refrigeration heating process is combined into a whole, and the cold and hot double-effect function of the freeze-dryer cooling equipment is exerted; the vacuum unit of the freeze dryer is utilized, so that the negative pressure steam generator can fully utilize the low-quality heat source at the middle temperature stage of the working medium air cooler under the condition of lower temperature, the whole self ice melting process of ice water ice melting without additional energy is realized, the comprehensive utilization rate of resources and the purity of ice melting plant water are further improved, the best economic benefit and social benefit are created.

Disclosure of Invention

The invention aims to solve the problem that the traditional freeze-drying process is high in energy consumption, low in cost and not environment-friendly, and provides a complete system and a process method for refrigerating and heating carbon dioxide and recovering negative-pressure defrosting water of a freeze dryer.

The utility model provides a technical scheme that the problem adopted is: the utility model provides a freeze dryer carbon dioxide refrigeration heating and negative pressure defrosting water recovery integrated system, includes carbon dioxide heating part A: the common portion B: a carbon dioxide refrigeration part C: and a negative pressure defrosting water recovery part D.

The carbon dioxide heating part A is composed of a gas cooler; a water inlet of the medium temperature section; a water outlet of the medium temperature section; a medium temperature working medium gas outlet; a high temperature working medium gas inlet; a high temperature section water inlet; a water outlet of the high-temperature section; a high-pressure stage exhaust interface of the carbon dioxide transcritical refrigerating unit; the generator heats the water supply interface; a generator heating water return interface; a heating plate group; a first heating plate group inlet and a second heating plate group inlet; a first heating plate group outlet and a second heating plate group outlet; the heating plate group is provided with an electric water inlet regulating valve; a heating medium pump of the heating plate group; an electric valve of the heating plate group; a three-way pipe for water supply of the heating plate; a water supply electric valve of a heating plate; a water supply interface of the heat recovery system; an electric valve at the outlet of the heating plate group; a heating plate water return three-way pipe; a heating plate water return electric valve; the water return interface of the heat recovery system; the high-pressure stage exhaust interface of the carbon dioxide transcritical refrigerating unit is connected with a high-temperature working medium gas inlet of the gas cooler, is connected to a medium-temperature working medium gas outlet through a high-temperature section radiating pipe and a medium-temperature section radiating pipe of the gas cooler, and is connected to a hot side inlet of a subcooler of the shared part B through a pipeline; the water outlet of the high-temperature section of the gas cooler is connected to a first heating plate group inlet and a second heating plate group inlet through a heating plate water supply three-way pipe, a heating plate group electric valve, a heating plate group heating medium pump and a heating plate group water inlet electric regulating valve; the other port of the heating plate water supply three-way pipe is communicated with a water supply port of the heat recovery system through a heating plate water supply electric valve; the heating plate group outlet I and the heating plate group outlet II are connected to a high-temperature section water inlet of the gas cooler through a heating plate group outlet electric valve and a heating plate water return three-way pipe; the other interface of the heating plate backwater three-way pipe is communicated with a backwater interface of the heat recovery system through a heating plate backwater electric valve; the generator heating water return interface at the water inlet of the middle temperature section of the gas cooler and the generator heating water supply interface at the water outlet of the middle temperature section of the gas cooler are respectively communicated with the gas-cooled middle temperature water return interface at the heating water outlet of the generator and the gas-cooled middle temperature water supply interface at the heating water inlet of the generator through a pipeline valve pump.

The shared part B consists of a subcooler; a hot side inlet; a cold side outlet; a hot side outlet; a cold side inlet; the carbon dioxide transcritical refrigerating unit is composed of a low-pressure suction interface; and the hot side inlet, the cold side outlet, the hot side outlet and the cold side inlet are respectively connected with the medium temperature working medium gas outlet of the heating part, the low-pressure stage air suction interface of the carbon dioxide transcritical refrigerating unit, the electric throttling valve of the refrigerating part and the electric regulating valve.

The carbon dioxide refrigeration part C consists of a low-cycle barrel; a steam inlet and a throttling gas inlet; a vapor outlet; a low-temperature liquid outlet I and a low-temperature liquid outlet II; an electric throttle valve; an electric control valve; cold trap; a cold trap inlet; a cold trap outlet; a cold trap electric regulating valve; a cold trap working medium circulating pump; an electric valve at the outlet of the cold trap; an air cooler; an air cooler inlet; an air cooler outlet; an electric regulating valve of the air cooler; an air cooler working medium circulating pump; an electric valve at the outlet of the air cooler; the low-circulating barrel throttling gas inlet and the steam outlet are respectively communicated with the electric throttling valve and the electric regulating valve; the first low-temperature liquid outlet of the low-circulation barrel is connected with the inlet of the cold trap through a cold trap working medium circulating pump and a cold trap electric regulating valve; the outlet of the cold trap is communicated with the steam inlet of the low-circulation barrel through an electric valve at the outlet of the cold trap; the low-temperature liquid outlet of the low-circulation barrel is communicated with a cold fan working medium circulating pump and an electric regulating valve of an air cooler and is connected with an inlet of the air cooler; the outlet of the air cooler is communicated with the steam inlet of the low circulation barrel through an electric valve at the outlet of the air cooler.

The negative pressure defrosting water recovery part D is composed of a negative pressure steam generator; the generator heats the water outlet; a water heating outlet electric valve; an air-cooled medium-temperature water return interface; the generator heats the water inlet; a water inlet electric valve is heated; an air-cooled medium-temperature water supply interface; a generator steam outlet; a generator steam electric valve; a defrost steam inlet; a generator water replenishing port; a generator water replenishing electric valve; a defrosting water three-way pipe; a defrosting drain outlet; a defrosting and draining electric valve; defrosting and draining pump; a recovery water tank; an electric valve for water inlet of the recovery water tank; an electric valve for water outlet of the recovery water tank; a recovered water precision processing interface; a negative pressure air exhaust port; a negative pressure air exhaust electric valve; a vacuum unit interface; breaking a vacuum port; breaking the vacuum electric valve; an emptying interface; the generator heating water outlet and the generator heating water inlet are respectively connected with a middle-temperature section water return interface and a middle-temperature section water supply interface of the gas cooler through a heating water outlet electric valve and a heating water electric regulating valve; the steam outlet of the generator is communicated with the defrosting steam inlet of the cold trap through an electric steam valve of the generator; the defrosting water outlet is connected with the generator water replenishing inlet through a defrosting water draining electric valve, a defrosting water draining pump, a defrosting water three-way pipe and a generator water replenishing electric valve; the other connector of the defrosting water three-way pipe is communicated with the recovery water tank through a water inlet electric valve of the recovery water tank; the water outlet electric valve of the recovery water tank is communicated with the recovery water fine treatment interface; the negative pressure air exhaust port is connected with the vacuum unit interface through a negative pressure air exhaust electric valve and is communicated with the defrosting steam inlet through the bin body; the vacuum breaking port of the negative pressure system is communicated with the emptying port through an electric vacuum breaking valve.

A carbon dioxide refrigeration heating and negative pressure defrosting water recovery complete system of a freeze dryer adopts the following steps:

the carbon dioxide refrigeration, heating and negative pressure defrosting water recovery parts of the complete system and the freeze dryer control system are completed under the control of a whole automatic program by a computer + configuration, a PLC module + corresponding system measurement and control components, and can be locally and remotely controlled by the computer and the mobile terminal through a 5G network. According to the requirements of the freeze-drying process, a control system of the freeze-dryer is firstly started to be a refrigerating part, and the control system firstly refrigerates quick-frozen materials of an air cooler, then refrigerates water captured by a cold trap and simultaneously stores energy for a heat recovery system; when the system needs to be heated, the heating part is started to provide sublimation heat for the heating plate group; finally, the negative pressure defrosting water recovery part is started to provide defrosting heat for the negative pressure steam generator; when defrosting is finished, the system releases vacuum, defrosting water firstly replenishes water for the generator and then is recovered in the recovery water tank. The whole set system adopts a cold and hot two-in-one parallel scheme, namely, cold and heat in the freeze-drying process are provided by the same carbon dioxide transcritical refrigerating unit, so that the working sequence of the whole set system is a refrigerating part C; heating part A; and a negative pressure defrosting water recovery part D.

C-refrigeration part: when the air cooler is required to refrigerate, the air cooler liquid supply electric regulating valve, the air cooler working medium circulating pump and the air cooler outlet electric valve are opened (at the moment, the carbon dioxide transcritical refrigerating unit refrigerates in advance, and the air cooler stores energy for the heat recovery system), throttling working medium liquid with the temperature lower than minus 30 ℃ in the low-cycle barrel flows into the coil inlet of the air cooler through the second low-cycle barrel liquid outlet and the air cooler liquid supply electric regulating valve under the action of the air cooler working medium circulating pump, the working medium liquid is evaporated into gas after absorbing heat and returns to the low-cycle barrel through the outlet of the coil of the air cooler and the electric valve at the outlet of the air cooler, primary air cooler refrigerating cycle is completed, continuous cycle is carried out, and the operation is stopped after a process setting program is completed; when cold trap refrigeration is needed, a cold trap liquid supply electric regulating valve, a cold trap working medium circulating pump and a cold trap outlet electric valve are opened (at the moment, a carbon dioxide transcritical refrigerating unit is used for refrigeration in advance, and a gas cooler is used for storing energy for a heat recovery system), throttling working medium liquid with the temperature lower than-30 ℃ in a low-cycle barrel flows into an inlet of a cold trap coil pipe through a first liquid outlet of the low-cycle barrel and the cold trap liquid supply electric regulating valve under the action of the cold trap working medium circulating pump, the working medium liquid absorbs sublimation heat and is evaporated into gas, the gas returns to the low-cycle barrel through an outlet of the cold trap coil pipe and the cold trap outlet electric valve, primary cold trap refrigeration cycle is completed, continuous cycle is carried out, and the operation is stopped after a process setting program is completed.

A-heating section: when the heating plate group is required to be heated, an electric regulating valve of the heating plate group, a heating medium of the heating plate group, an electric valve of the heating plate group and an electric valve of an outlet of the heating plate group are opened, and a water supply and return electric valve which is communicated with a water supply and return interface of a heat recovery system on two three-way pipe branches is closed at the same time, at the moment, a carbon dioxide transcritical refrigerating unit is opened in advance, the temperature of high-temperature working medium gas at an inlet of a heat dissipation coil pipe at a high-temperature section of a gas cooler can reach more than 100 ℃, cooling water flows into a first inlet and a second inlet of the heating plate group through a cooling liquid outlet at the high-temperature section of the gas cooler, a heating plate water supply three-way pipe, the electric valve of the heating plate group and the electric regulating valve of the heating plate group under the action of the heating plate group heat medium pump, the high-temperature working medium gas is cooled to below 90 ℃ and the heating plate group is heated to more than 80 ℃, and the temperature of the heating plate group can be regulated within a certain range according to process requirements; the heated and cooled water flows back to the high-temperature section of the gas cooler through the heating plate group I, the heating plate group II, the heating plate group outlet electric valve and the heating plate backwater tee pipe, so that one heating plate group heating circulation is completed, the heating is continuously and circularly performed, and the operation is stopped after a process setting program is completed; and when the heating plate group stops the heating program, opening the water supply and return electric valves on the two branch pipes of the water supply and return three-way pipes, starting the heat recovery system of the freeze dryer, recovering the heat of the gas cooler by the heat recovery system, and keeping the normal operation of the carbon dioxide transcritical refrigerating unit.

D-negative pressure defrosting water recovery part: after freeze-drying is finished and dry products are taken out of the bin, the defrosting system needs to be pumped to a process set negative pressure value again, at the moment, a negative pressure air pumping electric valve and a steam electric valve are opened, a vacuum unit is started, and the bin body and the generator are pumped to the pressure less than 6000Pa together through a vacuum unit interface, a defrosting steam inlet and a generator steam outlet; after the process set value is reached, the vacuumizing electric valve is closed, and vacuumizing is stopped; opening (or closing) corresponding valve elements and pump sets of a negative pressure steam generator heating water electric regulating valve, a heating water outlet electric valve and the like, and heating vaporized water in the generator by cooling water in a middle temperature section of a gas cooler; at the moment, the carbon dioxide transcritical refrigerating unit is started in advance, working medium flows into a heat dissipation coil pipe at the middle temperature section of the gas cooler, the temperature of the working medium is above 70 ℃, cooling water flows into a coil pipe inlet of the negative pressure steam generator through a cooling liquid outlet at the middle temperature section of the gas cooler and a heating water electric regulating valve under the action of a generator heating pump group, the cooling water continuously absorbs the heat of the working medium, continuously cools the middle temperature working medium gas to below 50 ℃, and vaporizes water in the generator into steam with the pressure of about 6000 Pa; cooling water which releases latent heat of vaporization flows back to the middle temperature section of the gas cooler after passing through a water outlet of a coil pipe of the generator and an electric valve for heating a water outlet, so that heating circulation of the generator is completed once, the heating circulation is continuously performed, and the operation is stopped after a process setting program is completed; when the generator stops the heating program, related valve elements of the heat recovery system are opened, the heat of gas cooling is recovered by the heat recovery system, and the normal operation of the carbon dioxide transcritical refrigerating unit is kept; when the generator is heated, defrosting is started, negative pressure steam generated by the generator continuously flows into the freeze-drying bin through the steam outlet, the steam electric valve and the defrosting steam inlet, is dispersed to the freezing surface of the cold trap under the drive of the energy field, performs heat and heat exchange with the ice surface, releases steam with latent heat of vaporization to melt ice into water, melts all ice into water after continuous heat and heat exchange reaches the process set time, and finishes the defrosting process; closing the electric heating water regulating valve and the electric heating water outlet valve, and stopping the generator heating system; opening a vacuum breaking electric valve, and relieving the vacuum of the defrosting system; after the pressure is balanced, the defrosting and draining electric valve, the defrosting and draining pump and the generator water replenishing electric valve are opened to replenish water for the generator, after the set water level is reached, the generator water replenishing electric valve is closed, the water inlet electric valve of the recovery water tank is opened, and the residual defrosting water is completely stored in the recovery water tank for the defrosting water precision treatment system. And closing the defrosting and draining valve pump, and completely completing part of tasks of negative pressure defrosting water recovery.

The utility model has the advantages that: aiming at the characteristics of a freeze-drying process, the excellent low-temperature refrigeration performance and the transcritical temperature slippage heat exchange characteristic of carbon dioxide are fully utilized, the effect that the COP (coefficient of performance) is more than 1 in the reverse Carnot cycle refrigeration heating is exerted, the freeze-drying refrigeration heating process is combined into a whole, and the cold and hot double-effect function of the cold supply equipment of a freeze dryer is exerted; the vacuum unit is used for generating a negative pressure environment, the low-quality heat source in the medium-temperature section of the working medium air cooler is fully utilized under the condition of negative pressure and low temperature, the full self-ice melting process of ice water ice melting without additional energy is realized, and the comprehensive utilization rate of resources and the purity of the plant water for defrosting are further improved.

Drawings

The following is a detailed description of an embodiment with reference to fig. 1:

FIG. 1 is a schematic diagram of a complete system for refrigerating and heating carbon dioxide and recovering negative-pressure defrosting water of a freeze dryer.

In FIG. 1

A-carbon dioxide heating section: 2-10-gas cooler; e-1-a water inlet of the medium temperature section; e-2-a water outlet of the medium temperature section; e-3-medium temperature working medium gas outlet; e-4-a high-temperature working medium gas inlet; e-5-a high-temperature section water inlet; e-6-a water outlet of the high-temperature section; 2-100-carbon dioxide transcritical refrigerating unit high-pressure level exhaust interface; 10-1' -heating backwater interface of the generator; 10-2' -the generator heats the interface of water supply; 1-20-heating plate group; 20-1-heating plate group outlet I, 20-2-heating plate group outlet II; 20-3-heating plate group inlet I, 20-4-heating plate group inlet II; 1-21-heating plate group water inlet electric regulating valve; 1-22-heating medium pump of heating plate group; 1-23-heating plate group electric valve; 1-2 a-a water supply three-way pipe of a heating plate; 1-24-heating plate water supply electric valve; 1-200-a water supply interface of a heat recovery system; 1-25-heating plate group outlet electric valve; 1-2 b-a heating plate backwater three-way pipe; 1-26-heating plate backwater electric valve; 1-201-a heat recovery system backwater interface;

b-common moiety: 2-20-a subcooler; f-1-hot side inlet; f-2-cold side outlet; f-3-hot side outlet; f-4-cold side inlet; 2-200-carbon dioxide transcritical refrigerating unit low-pressure stage air suction interface;

c-carbon dioxide refrigeration part: 2-30-low circulation barrel; g-1-steam inlet, g-2-throttling gas inlet; g-3-vapor outlet; g-4-low-temperature liquid outlet I, g-5-low-temperature liquid outlet II; 2-31 electric throttle valve; 2-32 electric control valve; 1-30-cold trap; 30-2-cold trap inlet; 30-1-cold trap outlet; 1-31-cold trap electric control valve; 1-32-cold trap working medium circulating pump; 1-33 cold trap outlet electric valve; 1-40-air cooler; 40-2-air cooler inlet; 40-1-air cooler outlet; 1-41-electric regulating valve of air cooler; 1-42-air cooler working medium circulating pump; 1-43-electric valve at outlet of air cooler;

d-negative pressure defrosting water recovery part: 1-10-negative pressure steam generator; 10-1-the generator heats the water outlet; 1-11-heating water outlet electric valve; e-1' -air cooling medium temperature backwater interface; 10-2-the generator heats the water inlet; 1-15-heating water inlet electric valve; e-2' -air cooling medium temperature water supply interface; 10-3-generator steam outlet; 10-5-generator steam electric valve; d-2-a defrost steam inlet; 10-4-generator water replenishing port; 10-6-generator water replenishing electric valve; d-1 b-a defrosting water three-way pipe; d-1-defrosting drain outlet; d-5-defrosting and draining electric valve; d-6-defrosting drain pump; 5-10-a recovery water tank; 5-1-a water inlet electric valve of a recovery water tank; 5-2-a water outlet electric valve of the recovery water tank; 5-100-a recovered water fine processing interface; d-3-a negative pressure pumping port; 3-1-negative pressure air extraction electric valve; 3-100-vacuum unit interface; d-7-breaking the vacuum port; 7-1-breaking vacuum electric valve; 7-100-emptying interface.

Detailed Description

Example, referring to fig. 1, there is included a carbon dioxide heating section a: the common portion B: a carbon dioxide refrigeration part C: and a negative pressure defrosting water recovery part D.

The carbon dioxide heating part A is composed of a gas cooler 2-10; a water inlet e-1 of the medium temperature section; a water outlet e-2 of the medium temperature section; a medium temperature working medium gas outlet e-3; a high-temperature working medium gas inlet e-4; a high temperature section water inlet e-5; a high-temperature section water outlet e-6; 2-100 parts of a high-pressure stage exhaust interface of the carbon dioxide transcritical refrigerating unit; the generator heating backwater interface 10-1'; the generator heats the water supply interface 10-2'; 1-20 heating plate groups; a first heating plate group outlet 20-1 and a second heating plate group outlet 20-2; a first heating plate group inlet 20-3 and a second heating plate group inlet 20-4; 1-21 electric water inlet regulating valves of the heating plate group; heating medium pump 1-22 of heating plate group; the heating plate group electric valves 1-23; a three-way pipe 1-2a for water supply of the heating plate; heating plate water supply electric valves 1-24; 1-200 parts of a water supply interface of the heat recovery system; an electric valve 1-25 at the outlet of the heating plate group; a heating plate water return three-way pipe 1-2b; heating plate water return electric valves 1-26; the return water interface 1-201 of the heat recovery system; the high-pressure stage exhaust interface 2-100 of the carbon dioxide transcritical refrigerating unit is connected with a high-temperature working medium gas inlet e-4 of a gas cooler 2-10, connected to a medium-temperature working medium gas outlet e-3 through a high-temperature section and a medium-temperature section radiating pipe of the gas cooler 2-10 and connected to a hot side inlet f-1 of a subcooler 2-20 of the common part B through a pipeline; a water outlet e-6 of a high-temperature section of the gas cooler 2-10 is connected to a first heating plate group inlet 20-3 and a second heating plate group inlet 20-4 through a heating plate water supply three-way pipe 1-2a, a heating plate group electric valve 1-23, a heating plate group heat medium pump 1-22 and a heating plate group water inlet electric regulating valve 1-21; the other interface of the heating plate water supply three-way pipe 1-2a is communicated with a water supply interface 1-200 of the heat recovery system through a heating plate water supply electric valve 1-24; the first heating plate group outlet 20-1 and the second heating plate group outlet 20-2 are connected to a high-temperature section water inlet e-5 of the gas cooler 2-10 through a heating plate group outlet electric valve 1-25 and a heating plate water return three-way pipe 1-2b; the other interface of the heating plate water return three-way pipe 1-2b is communicated with a heat recovery system water return interface 1-201 through a heating plate water return electric valve 1-26; the generator heating water return interface 10-1 'of the water inlet e-1 of the middle temperature section of the gas cooler 2-10 and the generator heating water supply interface 10-2' of the water outlet e-2 of the middle temperature section are respectively communicated with the air-cooled middle temperature water return interface e-1 'of the generator heating water outlet 10-1 and the air-cooled middle temperature water supply interface e-2' of the generator heating water inlet 10-2 through a pipeline valve pump.

The shared part B is formed by a subcooler 2-20; a hot side inlet f-1; a cold side outlet f-2; a hot side outlet f-3; a cold side inlet f-4; the carbon dioxide transcritical refrigerating unit low-pressure stage air suction interface is 2-200; a hot side inlet f-1 and a cold side outlet f-2 are respectively connected with a medium temperature working medium gas outlet e-3 of the carbon dioxide heating part (A) and a low-pressure stage air suction interface 2-200 of the carbon dioxide transcritical refrigerating unit; the hot side outlet f-3 and the cold side inlet f-4 are respectively communicated with the electric throttle valve 2-31 and the electric regulating valve 2-32 of the carbon dioxide refrigerating part (C).

The carbon dioxide refrigeration part C consists of 2-30 parts of a low-cycle barrel; a steam inlet g-1 and a throttling gas inlet g-2; a vapor outlet g-3; a first low-temperature liquid outlet g-4 and a second low-temperature liquid outlet g-5; electric throttle valve 2-31; 2-32 of an electric control valve; 1-30 parts of a cold trap; a cold trap inlet 30-2; a cold trap outlet 30-1; cold trap electric control valves 1-31; 1-32 of a cold trap working medium circulating pump; electric valve 1-33 at the outlet of the cold trap; 1-40 parts of an air cooler; an air cooler inlet 40-2; an air cooler outlet 40-1; electric regulating valves 1-41 of the air cooler; 1-42 of an air cooler working medium circulating pump; electric valve 1-43 at the outlet of the air cooler; the throttle gas inlet g-2 and the steam outlet g-3 of the low-circulation barrel 2-30 are respectively communicated with an electric throttle valve 2-31 and an electric regulating valve 2-32; the low-temperature liquid outlet g-4 of the low-circulation barrel 2-30 is connected with the cold trap inlet 30-2 through a cold trap working medium circulating pump 1-32 and a cold trap electric regulating valve 1-31; the cold trap outlet 30-1 is communicated with a steam inlet g-1 of the low circulation barrel 2-30 through an electric valve 1-33 of the cold trap outlet; the second g-5 low-temperature liquid outlet of the low-circulation barrel 2-30 is connected with the air cooler inlet 40-2 through an air cooler working medium circulating pump 1-42 and an air cooler electric regulating valve 1-41; the air cooler outlet 40-1 is communicated with the steam inlet g-1 of the low-cycle barrel 2-30 through an electric valve 1-43 of the air cooler outlet.

The negative pressure defrosting water recovery part D is composed of a negative pressure steam generator 1-10; the generator heats the water outlet 10-1; electric valves 1-11 are arranged at the heating water outlet; an air-cooled medium-temperature water return interface e-1'; the generator heats the water inlet 10-2; electrically operated valve 1-15 for heating water inlet; air-cooled medium-temperature water supply interface e-2'; a generator steam outlet 10-3; a generator steam electric valve 10-5; a defrosting steam inlet d-2; 10-4 parts of a generator water replenishing port; a generator water replenishing electric valve 10-6; a defrosting water three-way pipe d-1b; a defrosting drain port d-1; defrosting and draining electric valve d-5; d-6, a defrosting drain pump; 5-10 parts of a recovery water tank; an electric valve 5-1 for water inlet of the recovery water tank; an electric valve 5-2 for water outlet of the recovery water tank; 5-100 parts of a recovered water fine processing interface; a negative pressure pumping port d-3; a negative pressure air extraction electric valve 3-1; 3-100 parts of a vacuum unit interface; breaking a vacuum port d-7; a vacuum breaking electric valve 7-1; an emptying interface 7-100; the generator heating water outlet 10-1 and the generator heating water inlet 10-2 are respectively connected with an air-cooled middle-temperature section water return interface e-1 'and an air-cooled middle-temperature section water supply interface e-2' through a heating water outlet electric valve 1-11 and a heating water inlet electric valve 1-15; the generator steam outlet 10-3 is communicated with the cold trap defrosting steam inlet d-2 through a generator steam electric valve 10-5; the defrosting water outlet d-1 is connected with a generator water replenishing port 10-4 through a defrosting water draining electric valve d-5, a defrosting water draining pump d-6, a defrosting water three-way pipe d-1b and a generator water replenishing electric valve 10-6; the other connector of the defrosting water three-way pipe d-1b is communicated with a recovery water tank 5-10 through a recovery water tank water inlet electric valve 5-1; the electric valve 5-2 for the water outlet of the recovery water tank is communicated with the fine treatment interface 5-100 for the recovery water; the negative pressure air exhaust port d-3 is connected with a vacuum unit interface 3-100 through a negative pressure air exhaust electric valve 3-1 and is communicated with a defrosting steam inlet d-2 through a bin body; the vacuum breaking port d-7 of the negative pressure system is communicated with the emptying port 7-100 through the vacuum breaking electric valve 7-1.

the carbon dioxide refrigeration, heating and negative pressure defrosting water recovery parts of the complete system and the freeze dryer control system are completed under the control of a whole automatic program by a computer + configuration, a PLC module + corresponding system measurement and control component, and can be locally and remotely controlled by the computer and the mobile terminal through a 5G network. According to the requirements of the freeze-drying process, a control system of the freeze-drying machine is firstly started to be a refrigerating part, firstly, a cold air blower 1-40 quick-frozen material is refrigerated, then, a cold trap 1-30 water is refrigerated, and simultaneously, energy is stored for a heat recovery system; when the system needs heating, the heating part is started to provide sublimation heat for the heating plate groups 1-20; finally, opening the negative pressure defrosting water recovery part to provide defrosting heat for the negative pressure steam generators 1-10; when defrosting is finished, the system releases vacuum, defrosting water is firstly supplemented for the generator, and then the defrosting water is recovered in the recovery water tank. The whole set system adopts a cold and hot two-in-one parallel scheme, namely, cold and heat in the freeze-drying process are provided by the same carbon dioxide transcritical refrigerating unit, so that the working sequence of the whole set system is a refrigerating part C; heating part A; and a negative pressure defrosting water recovery part D.

C-refrigeration part: when the air cooler 1-40 is required to refrigerate, the air cooler 1-40, the air cooler electric regulating valve 1-41, the air cooler working medium circulating pump 1-42 and the air cooler outlet electric valve 1-43 are opened (at the moment, the carbon dioxide transcritical refrigerating unit refrigerates in advance, and the air cooler stores energy for a heat recovery system), throttling working medium liquid with the temperature lower than-30 ℃ in the low-circulation barrel 2-30 flows into the air cooler inlet 40-2 through the low-temperature liquid outlet two g-5 and the air cooler electric regulating valve 1-41 under the action of the air cooler working medium circulating pump 1-42, the working medium liquid absorbs heat and evaporates into gas, and returns to the low-circulation barrel 2-30 through the air cooler outlet 40-1 and the air cooler outlet electric valve 1-43 to complete the primary air cooler 1-40 refrigerating cycle, the continuous cycle is carried out, and the operation is stopped after the process setting program is completed; when the cold trap 1-30 is needed to refrigerate, the cold trap electric regulating valve 1-31, the cold trap working medium circulating pump 1-32 and the cold trap outlet electric valve 1-33 are opened (at the moment, the carbon dioxide transcritical refrigerating unit refrigerates in advance, and meanwhile, the gas cooler stores energy for the heat recovery system), throttling working medium liquid with the temperature lower than minus 30 ℃ in the low-cycle barrel 2-30 flows into the cold trap inlet 30-2 through the low-temperature liquid outlet g-4 and the cold trap electric regulating valve 1-31 under the action of the cold trap working medium circulating pump 1-32, the working medium liquid absorbs the sublimation heat and is evaporated into gas, and the gas returns to the low-cycle barrel 2-30 through the cold trap outlet 30-1 and the cold trap outlet electric valve 1-33 to complete the primary cold trap 1-30 refrigerating cycle and continuously circulate, and stops running after the process setting program is completed.

A-heating section: when the heating plate group 1-20 is required to be heated, the heating plate group water inlet electric regulating valve 1-21, the heating plate group heat medium pump 1-22, the heating plate group electric valve 1-23 and the heating plate group outlet electric valve 1-25 are opened, and the heating plate water supply electric valve 1-24 and the heating plate water return electric valve 1-26 of the two three-way pipe branches leading to the heat recovery system interface are closed at the same time, at the moment, the carbon dioxide transcritical refrigerating unit is opened in advance, the high-temperature working medium gas temperature of the gas cooler 2-10 high-temperature working medium gas inlet e-4 can reach more than 100 ℃, cooling water flows into the heating plate group inlet one 20-3 and the heating plate group inlet two 20-4 through the gas cooler 2-10 high-temperature section water outlet e-6, the heating plate water supply three-way pipe 1-2a, the heating plate group electric valve 1-23 and the heating plate group water inlet electric regulating valve 1-21 under the effect of the heating plate group heat medium pump 1-22, the cooling water continuously absorbs heat, and cools the high-temperature working medium gas to below 90 ℃ and heats the heating plate group to more than 80 ℃, and the temperature of the heating plate group can be regulated within a certain range according to the process requirement; the heated and cooled water flows back to the high-temperature section of the gas cooler 2-10 through the first heating plate group outlet 20-1, the second heating plate group outlet 20-2, the electric valve 1-25 of the heating plate group outlet, the heating plate return water three-way pipe 1-2b, the primary heating plate group 1-20 heating circulation is completed, the continuous circulation is carried out, and the operation is stopped after the process setting program is completed; and (3) opening the heating plate water supply electric valve 1-24 and the heating plate water return electric valve 1-26 of the two three-way pipe branches communicated with the interface of the heat recovery system while the heating plate group 1-20 stops the heating program, starting the heat recovery system of the freeze dryer, recovering the heat of the gas cooler 2-10 by the heat recovery system, and keeping the normal operation of the carbon dioxide transcritical refrigerating unit.

D-negative pressure defrosting water recovery part: after freeze-drying is finished and dry products are taken out of the bin, the defrosting system needs to be pumped to a process set negative pressure value again, at the moment, the negative pressure air pumping electric valve 3-1 and the generator steam electric valve 10-5 are opened, the vacuum unit is started, and the bin body and the generator are pumped to the pressure less than 6000Pa through the vacuum unit interface 3-100, the defrosting steam inlet d-2 and the generator steam outlet 10-3; after the process set value is reached, closing the negative pressure air exhaust electric valve 3-1 and stopping evacuating; opening (or closing) corresponding valve elements and pump groups of a negative pressure steam generator 1-10 heating water inlet electric valve 1-15, a heating water outlet electric valve 1-11 and the like, and heating vaporized water in the generator by cooling water in a middle temperature section of a gas cooler 2-10; at the moment, the carbon dioxide transcritical refrigerating unit is started in advance, the temperature of working media flowing into a heat dissipation coil pipe at the middle temperature section of a gas cooler 2-10 is above 70 ℃, cooling water flows into a heating water inlet 10-2 of the generator through a water outlet e-2 at the middle temperature section of the gas cooler 2-10, a heating water supply interface 10-2' of the generator and an electric valve 1-15 of the heating water inlet under the action of a heating pump group of the generator, the cooling water continuously absorbs the heat of the working media, continuously cools the middle temperature working media gas to below 50 ℃, and vaporizes water in a negative pressure steam generator 1-10 into steam with the pressure of about 6000 Pa; cooling water releasing latent heat of vaporization flows back to the middle temperature section of the gas cooler 2-10 through a generator heating water outlet 10-1, a heating water outlet electric valve 1-11 and a gas cooling middle temperature section water return interface e-1', a primary negative pressure steam generator 1-10 heating cycle is completed, the continuous cycle is carried out, and the operation is stopped after a process setting program is completed; when the negative pressure steam generator 1-10 stops the heating program, relevant valve elements of the heat recovery system are opened, the heat recovery system cools the gas for 2-10 heat recovery, and the normal operation of the carbon dioxide transcritical refrigerating unit is kept; when the negative pressure steam generator 1-10 is heated, defrosting is started, negative pressure steam generated by the negative pressure steam generator 1-10 continuously flows into the freeze-drying bin through the steam outlet 10-3 of the generator, the electric steam valve 10-5 of the generator and the defrosting steam inlet d-2, is dispersed to the icing surface of the cold trap 1-30 under the drive of the energy field, and is subjected to heat exchange with the ice surface, the steam with latent heat of vaporization is released to melt ice into water, after the continuous heat exchange reaches the process set time, the ice is completely melted into water, and the defrosting process is finished; closing the electric valves 1-15 of the heating water inlet and 1-11 of the heating water outlet, and stopping heating the negative pressure steam generator 1-10; opening the electric vacuum breaking valve 7-1, and removing the vacuum of the defrosting system; after pressure is balanced, the defrosting and draining electric valve d-5, the defrosting and draining pump d-6 and the generator water replenishing electric valve 10-6 are started to replenish water for the negative pressure steam generator 1-10, after the set water level is reached, the generator water replenishing electric valve 10-6 is closed, the recovery water tank water inlet electric valve 5-1 is opened, and the residual defrosting water is completely stored in the recovery water tank 5-10 for use by a defrosting water fine treatment system. And at this moment, the defrosting and draining valve pump is closed, and the negative pressure defrosting water recovery part D is completely finished.

The design principle of the utility model is as follows: no matter what kind of freeze dryer, refrigeration equipment for providing freezing and desublimation cold energy is required to be equipped in the process of completing the freeze-drying process; heating equipment for sublimation and defrosting is provided; a vacuum apparatus providing a vacuum environment; and a large amount of raw materials (fruit and vegetable raw materials are more than 80 percent) are dehydrated while the dry product is produced; at present, refrigerating equipment matched with a traditional freeze dryer is generally a refrigerating machine of HFCs mixed working medium (CWP is more than 1000); the matched heating equipment is a boiler (COP < 1); the matched defrosting scheme is water defrosting generally; therefore, the traditional freeze dryer consumes much energy, is remarkably wasted and is not environment-friendly; the method is not suitable for the current environment of energy conservation, emission reduction and green development, and is the maximum pain point of the high-end drying process which cannot be generally applied; the invention selects green and environment-friendly CO ₂ Working medium (GWP = 1) adopts a transcritical bipolar refrigeration compressor set, a sectional gas cooler 2-10, a subcooler 2-20 and a low-cycle barrel 2-30 are additionally arranged, and the excellent low-temperature refrigeration performance and transcritical temperature of carbon dioxide are fully utilized to realize sliding and exchangingThe heat characteristic, exert the efficiency that the heating energy efficiency ratio of the refrigeration of reverse Carnot cycle is greater than 1, freeze-drying the refrigeration heating process to unite two into one, make the freeze-dryer cooling equipment exert the double-effect function of refrigerating and heating, cooperate with the heat recovery system (ZL 202023232256.5) of the freeze-dryer to omit the heating equipment and power consumption that COP is less than 1, and then produce the super efficiency that the comprehensive COP is greater than 6; a vacuum unit equipped with a freeze dryer is utilized, a negative pressure steam generator 1-10 (ZL 201620676267.7) and a recovery water tank 5-10 (ZL 202021599215.7) are additionally arranged, and heat provided by a gas cooler 2-10 in a middle temperature section is utilized to completely melt ice-catching of a cold trap 1-30 (ZL 201620676268.1) and completely recycle the ice-catching, so that the utilization rate of freeze-drying raw materials is close to 100%.

The utility model aims at the characteristics of the freeze-drying process, effectively utilizes the low-temperature cold source and the high-temperature heat source generated by the transcritical circulation of carbon dioxide, is additionally provided with a sectional gas cooler 2-10, and respectively meets the heating requirements of a heating plate group 1-20 (ZL 2016385248.5) and a negative pressure steam generator 1-10; the low-cycle barrel 2-30 working medium multiplying power cycle is used for directly evaporating to meet the requirements of low-temperature, uniform and efficient refrigeration of 1-30 cold traps and 1-40 air coolers; a subcooler 2-20 and an electric throttle valve 2-31 are additionally arranged, so that the problems of low critical temperature (31.1 ℃) and large throttling loss of carbon dioxide are solved; the negative pressure steam generator 1-10 and the recovery water tank 5-10 are additionally arranged, a vacuum unit is used for generating a negative pressure environment, the low-temperature low-quality heat source in the medium-temperature section of the gas cooler 2-10 is fully utilized under the condition of negative pressure and low temperature, the full self ice melting process of ice water ice melting without additional energy sources is realized, and the comprehensive utilization rate of resources and the purity of plant water are further improved.

The system control of the utility model is that the local and remote automatic program control is carried out on the system through the programmable PLC module, the configuration upper computer, the 5G network and the mobile terminal and through the special sensor and the executive component of each control point; the carbon dioxide transcritical refrigerating unit completes the refrigerating processes of the heating plate groups 1-20 and the negative pressure steam generators 1-10 while completing the refrigerating of the air coolers 1-40 and the cold traps 1-30; and the recycling of low-quality heat sources in the middle temperature section of the air cooler and the complete recycling of the ice melting water are realized through the negative-pressure defrosting water recycling system, the comprehensive utilization rate of resources and the purity of plant water are improved, and the ultrahigh use value is created.

Claims

1. A complete system for refrigerating and heating carbon dioxide and recovering negative-pressure defrosting water of a freeze dryer is characterized by comprising a carbon dioxide heating part (A); a common portion (B); a carbon dioxide refrigeration section (C); a negative pressure defrosting water recovery section (D); the carbon dioxide heating part (A) consists of a gas cooler (2-10), a middle temperature section water inlet (e-1), a middle temperature section water outlet (e-2), a middle temperature working medium gas outlet (e-3), a high temperature working medium gas inlet (e-4), a high temperature section water inlet (e-5), a high temperature section water outlet (e-6), a carbon dioxide transcritical refrigerating unit high-pressure stage exhaust interface (2-100), a generator heating water return interface (10-1 '), a generator heating water supply interface (10-2'), a heating plate group (1-20), a heating plate group outlet I (20-1) and a heating plate group outlet II (20-2), the system comprises a heating plate group inlet I (20-3), a heating plate group inlet II (20-4), a heating plate group water inlet electric regulating valve (1-21), a heating plate group heat medium pump (1-22), a heating plate group electric valve (1-23), a heating plate water supply three-way pipe (1-2 a), a heating plate water supply electric valve (1-24), a heat recovery system water supply interface (1-200), a heating plate group outlet electric valve (1-25), a heating plate water return three-way pipe (1-2 b), a heating plate water return electric valve (1-26) and a heat recovery system water return interface (1-201); the shared part (B) consists of a subcooler (2-20), a hot side inlet (f-1), a cold side outlet (f-2), a hot side outlet (f-3), a cold side inlet (f-4) and a carbon dioxide transcritical refrigerating unit low-pressure stage air suction interface (2-200); the carbon dioxide refrigerating part (C) consists of a low-circulation barrel (2-30), a steam inlet (g-1), a throttling gas inlet (g-2), a steam outlet (g-3), a low-temperature liquid outlet I (g-4), a low-temperature liquid outlet II (g-5), an electric throttle valve (2-31), an electric regulating valve (2-32), a cold trap (1-30), a cold trap inlet (30-2), a cold trap outlet (30-1), a cold trap electric regulating valve (1-31), a cold trap working medium circulating pump (1-32), a cold trap outlet electric valve (1-33), an air cooler (1-40), an air cooler inlet (40-2), an air cooler outlet (40-1), an air cooler electric regulating valve (1-41), an air cooler working medium circulating pump (1-42) and an air cooler outlet electric valve (1-43); the negative pressure defrosting water recovery part (D) consists of a negative pressure steam generator (1-10), a generator heating water outlet (10-1), a heating water outlet electric valve (1-11), an air-cooling medium-temperature water return interface (e-1 '), a generator heating water inlet (10-2), a heating water inlet electric valve (1-15), an air-cooling medium-temperature water supply interface (e-2'), a generator steam outlet (10-3), a generator steam electric valve (10-5), a defrosting steam inlet (D-2), a generator water replenishing port (10-4), a generator water replenishing electric valve (10-6), a defrosting water three-way pipe (D-1 b), a defrosting water outlet (D-1), a water drainage electric valve (D-5), a defrosting drain pump (D-6), a recovery water tank electric valve (5-10), a recovery water tank water inlet electric valve (5-1), a recovery water tank water outlet electric valve (5-2), a recovery water fine treatment interface (5-100), an air suction port (D-3), a negative pressure vacuum pump (3-1), a vacuum unit air discharge port (3-100), a vacuum breaking vacuum air suction port (7-1) and a vacuum air suction port (7-100).

2. The complete system for refrigerating and heating carbon dioxide and recovering negative-pressure defrosting water of the freeze dryer according to claim 1, characterized in that the carbon dioxide heating part (A) is connected with a high-temperature working medium gas inlet (e-4) of a gas cooler (2-10) through a high-temperature section and a medium-temperature section radiating pipe of the gas cooler (2-10) and is connected with a medium-temperature working medium gas outlet (e-3) through a high-temperature section and a medium-temperature section radiating pipe of the gas cooler (2-10) and is connected with a hot side inlet (f-1) of a subcooler (2-20) of a shared part (B) through a pipeline; a water outlet (e-6) of a high-temperature section of the gas cooler (2-10) is connected to a first heating plate group inlet (20-3) and a second heating plate group inlet (20-4) through a heating plate water supply three-way pipe (1-2 a), a heating plate group electric valve (1-23), a heating plate group heat medium pump (1-22) and a heating plate group water inlet electric regulating valve (1-21); the other interface of the heating plate water supply three-way pipe (1-2 a) is communicated with a water supply interface (1-200) of the heat recovery system through a heating plate water supply electric valve (1-24); the heating plate group outlet I (20-1) and the heating plate group outlet II (20-2) are connected to a high-temperature section water inlet (e-5) of the gas cooler (2-10) through a heating plate group outlet electric valve (1-25) and a heating plate water return three-way pipe (1-2 b); the other interface of the heating plate backwater three-way pipe (1-2 b) is communicated with a backwater interface (1-201) of the heat recovery system through a heating plate backwater electric valve (1-26); a generator heating water return interface (10-1 ') of a medium-temperature section water inlet (e-1) of the gas cooler (2-10) and a generator heating water supply interface (10-2') of a medium-temperature section water outlet (e-2) are respectively communicated with a gas-cooling medium-temperature water return interface (e-1 ') of a generator heating water outlet (10-1) and a gas-cooling medium-temperature water supply interface (e-2') of a generator heating water inlet (10-2) through a pipeline valve pump.

3. The complete set of system for refrigerating, heating and recovering negative pressure defrosting water of the carbon dioxide of the freeze dryer according to claim 1, characterized in that the subcooler (2-20) of the common part (B) is provided with a hot side inlet (f-1) and a cold side outlet (f-2) which are respectively connected with a medium temperature working medium gas outlet (e-3) of the carbon dioxide heating part (A) and a low pressure stage air suction interface (2-200) of a carbon dioxide transcritical refrigerating unit; the hot side outlet (f-3) and the cold side inlet (f-4) are respectively communicated with the carbon dioxide refrigerating part (C), the electric throttle valve (2-31) and the electric regulating valve (2-32).

4. The carbon dioxide refrigeration heating and negative pressure defrosting water recovery complete set system of the freeze dryer according to claim 1, characterized in that the carbon dioxide refrigeration part (C) is provided with a throttling gas inlet (g-2) and a steam outlet (g-3) of a low-circulation barrel (2-30), which are respectively communicated with an electric throttling valve (2-31) and an electric regulating valve (2-32); a first low-temperature liquid outlet (g-4) of the low-circulation barrel (2-30) is connected with a cold trap inlet (30-2) through a cold trap working medium circulating pump (1-32) and a cold trap electric regulating valve (1-31); the cold trap outlet (30-1) is communicated with the steam inlet (g-1) of the low circulation barrel (2-30) through an electric valve (1-33) of the cold trap outlet; a second low-temperature liquid outlet (g-5) of the low-circulation barrel (2-30) is connected with an air cooler inlet (40-2) through an air cooler working medium circulating pump (1-42) and an air cooler electric regulating valve (1-41); the outlet (40-1) of the air cooler is communicated with the steam inlet (g-1) of the low-circulation barrel (2-30) through an electric valve (1-43) at the outlet of the air cooler.

5. The carbon dioxide refrigerating and heating and negative pressure defrosting water recycling complete set system of the freeze dryer according to claim 1, characterized in that the negative pressure defrosting water recycling part (D) is connected with the air-cooled medium-temperature water returning interface (e-1 ') and the air-cooled medium-temperature water supplying interface (e-2') through the electric heating water outlet valve (1-11) and the electric heating water inlet valve (1-15) of the generator heating water outlet (10-1) and the generator heating water inlet (10-2), respectively; the generator steam outlet (10-3) is communicated with the defrosting steam inlet (d-2) through a generator steam electric valve (10-5); the defrosting water outlet (d-1) is connected with the generator water replenishing port (10-4) through a defrosting water draining electric valve (d-5), a defrosting water draining pump (d-6), a defrosting water three-way pipe (d-1 b) and a generator water replenishing electric valve (10-6); the other connector of the defrosting water three-way pipe d-1b is communicated with a recovery water tank (5-10) through a recovery water tank water inlet electric valve (5-1); the electric valve (5-2) for the water outlet of the recovery water tank is communicated with the fine treatment interface (5-100) for the recovered water; the negative pressure air extraction port (d-3) is connected with the vacuum unit interface (3-100) through a negative pressure air extraction electric valve (3-1) and is communicated with the defrosting steam inlet (d-2) through the bin body; the vacuum breaking port (d-7) of the negative pressure system is communicated with the emptying port (7-100) through a vacuum breaking electric valve (7-1).