Isoenthalpy temperature increasing heat source equipment for efficiently recycling NMP

Abstract

The utility model discloses isenthalpy temperature increasing heat source equipment for efficiently recovering NMP (N-Methyl Pyrrolidone). The isenthalpy temperature increasing heat source equipment comprises a heat pipe recovery module, a first-stage temperature increasing module, a second-stage temperature increasing module and a third-stage temperature increasing module, the heat pipe recovery module is in a U shape and comprises a heat pipe pre-cooling end and a heat pipe reheating end which are correspondingly arranged at the two ends. The first-stage temperature increasing module comprises a first-stage compressor, a first-stage condenser, a first-stage throttle valve and a first-stage evaporator which are connected through copper pipes; the second-stage warming module comprises a second-stage compressor, a second-stage condenser, a second-stage throttle valve and a second-stage evaporator which are connected through copper pipes; and an NMP recovery device is arranged below the first-stage evaporator and the second-stage evaporator. The isenthalpy temperature-increasing heat source equipment for efficiently recovering NMP has the advantages of being capable of efficiently recovering NMP, excellent in energy-saving effect and good in environment-friendly performance.

Description

TECHNICAL FIELD

[0001] The utility model relates to NMP recovery equipment technical field especially relates to a kind of NMP efficient recovery's isotherm temperature increasing heat source equipment. BACKGROUND

[0002] In the production and manufacturing process of lithium battery, organic solvent with NMP (N-methyl pyrrolidone) is usually coated on battery chip and dried, and battery chip drying procedure generally needs high-temperature hot air of more than 100 DEG C to make organic solvent volatilize to achieve the purpose of drying, in order to avoid air pollution, NMP cannot be directly discharged into the atmosphere, therefore, battery manufacturers need to recycle NMP.

[0003] At present, the equipment for providing hot air for battery chip drying procedure is mostly oil-fired boiler or gas-fired boiler, however, oil-fired boiler or gas-fired boiler not only has huge energy consumption, which leads to the increase of battery production cost, but also may pollute the environment. In addition, some battery manufacturers use cooling tower to recover NMP, however, the water required by cooling tower is extremely large, which also leads to the increase of battery production cost, and cooling tower is prone to freeze-cracking problem under extremely low temperature working condition in winter, which leads to complex operation and maintenance process and high operation and maintenance cost.

[0004] Patent CN218210846U discloses a "Dual-Effect Heat Pump Type NMP Exhaust Gas Multi-Stage Condensation and Recovery Device," comprising a waste heat recovery heat exchanger and first and second heat pump circulation components. The first heat pump circulation component includes a first evaporator, a first throttling valve, a first condenser, and a first compressor connected in a circulation loop. The second heat pump circulation component includes a second evaporator, a second throttling valve, a second condenser, and a second compressor connected in a circulation loop. The waste heat recovery heat exchanger is connected to a coating machine, the first evaporator, the first condenser, and the second condenser; the first evaporator is connected to the second evaporator; and the second evaporator and the second condenser are connected to each other. The waste heat recovery heat exchanger, the first evaporator, and the second evaporator are all connected to an NMP storage tank. The first condenser is connected to the coating machine via an exhaust gas pipeline. This device can achieve both NMP exhaust gas recovery and waste heat recovery. However, the device has the following problems: 1. The NMP exhaust gas generated by the coating machine passes through the waste heat recovery heat exchanger and exchanges heat with the primary heated exhaust gas passing through the second condenser. The heat recovery effect of the waste heat recovery heat exchanger is poor. 2. The exhaust gas passes through the waste heat recovery heat exchanger, the first evaporator, the second evaporator, and the second condenser in sequence, and then returns to the waste heat recovery heat exchanger and the first condenser. The waste heat recovery heat exchanger, the first evaporator, and the second evaporator are located in the lower layer of the device, while the second condenser and the first condenser are located in the upper layer. This complex air duct results in a large amount of energy loss during the exhaust gas circulation process, leading to a low heat exchange efficiency of the entire device. 3. In order to ensure the negative pressure state of the coating machine, some exhaust gas needs to be discharged and treated before being discharged into the atmosphere. That is, zero emission of NMP exhaust gas cannot be achieved solely by this device.

[0005] To address this, we propose an isenthalpic heating heat source device for high-efficiency NMP recovery. Utility Model Content

[0006] The purpose of this invention is to provide an isenthalpic heating heat source device for efficient NMP recovery, which can efficiently recover NMP, has excellent energy-saving effect, and has good environmental performance.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A high-efficiency NMP recovery isenthalpic heating heat source device includes: a device shell, and a heat pipe recovery module, a primary heating module, a secondary heating module and a tertiary heating module are provided inside the device shell.

[0009] The heat pipe recovery module is U-shaped and includes a heat pipe pre-cooling end and a heat pipe reheating end located at opposite ends.

[0010] The primary heating module includes a primary compressor, a primary condenser, a primary throttling valve, and a primary evaporator connected by copper pipes.

[0011] The secondary temperature increasing module comprises a secondary compressor, a secondary condenser, a secondary throttle valve and a secondary evaporator connected by copper pipes.

[0012] The tertiary temperature increasing module comprises a tertiary compressor, a tertiary condenser, a tertiary throttle valve and a tertiary evaporator connected by copper pipes.

[0013] The device housing is provided with a temperature increasing air duct and a temperature decreasing air duct, the heat pipe pre-cooling end, the first evaporator, the second evaporator, the heat pipe reheating end, the tertiary condenser, the secondary condenser and the first condenser are sequentially arranged in the temperature increasing air duct, one end of the temperature increasing air duct close to the heat pipe pre-cooling end is provided with an air return port, and the other end is provided with an air supply port, the tertiary evaporator is arranged in the temperature decreasing air duct, and the NMP recovery device is arranged below the first evaporator and the second evaporator.

[0014] Further, the temperature increasing air duct is horizontally arranged, the air supply fan is arranged at the air supply port, and the windward surfaces of the heat pipe pre-cooling end, the first evaporator, the second evaporator, the heat pipe reheating end, the tertiary condenser, the secondary condenser and the first condenser are vertically arranged.

[0015] Further, the device housing is provided with a system cavity separated from the temperature increasing air duct, and the first compressor, the first throttle valve, the second compressor, the second throttle valve, the third compressor and the third throttle valve are arranged in the system cavity.

[0016] Further, the heat pipe recovery module, the first evaporator, the second evaporator, the tertiary condenser, the secondary condenser, the first condenser and the surface of the copper pipe in the temperature increasing air duct are subjected to NMP corrosion prevention treatment.

[0017] Further, the air inlet end of the temperature decreasing air duct is communicated with the atmosphere, and the air outlet end is communicated with the indoor.

[0018] Further, the NMP recovery device comprises a water pan arranged directly below the first evaporator and the second evaporator.

[0019] Further, the water pan is connected with a liquid storage container arranged outside the device housing.

[0020] The utility model discloses a heat pipe recycling module, primary temperature increasing module, secondary temperature increasing module and tertiary temperature increasing module, the heat pipe recycling module is U type, including correspondingly setting the heat pipe precooling end and heat pipe reheating end at both ends, the primary temperature increasing module includes through copper pipe connection primary compressor, primary condenser, primary throttle valve and primary evaporator, the secondary temperature increasing module includes through copper pipe connection secondary compressor, secondary condenser, secondary throttle valve and secondary evaporator, and the below of primary evaporator and secondary evaporator is equipped with NMP recovery device. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The system principle schematic diagram of NMP high -efficient recovery's isenthalpic temperature increasing heat source equipment provided by the utility model is provided;

[0022] Figure 2 The structure schematic diagram of NMP high -efficient recovery's isenthalpic temperature increasing heat source equipment provided by the utility model is provided. DETAILED DESCRIPTION

[0023] The utility model provides a kind of NMP high -efficient recovery's isenthalpic temperature increasing heat source equipment, to make the purpose, technical scheme and effect of the utility model more clear, definite, the following referring to drawing and taking example is further detailed to the utility model of the utility model.It should be understood that the specific embodiment described here is only used to explain the utility model, and is not used to limit the utility model.

[0024] The utility model provides a kind of NMP high -efficient recovery's isenthalpic temperature increasing heat source equipment, its structure as Figure 1 、 Figure 2 As shown in the figure, including: equipment shell 10, equipment shell 10 is equipped with heat pipe recycling module 20, primary temperature increasing module 30, secondary temperature increasing module 40 and tertiary temperature increasing module 50;The heat pipe recycling module 20 is U type, including correspondingly setting the heat pipe precooling end 21 and heat pipe reheating end 22 at both ends;The primary temperature increasing module 30 includes through copper pipe connection primary compressor 31, primary condenser 32, primary throttle valve 33 and primary evaporator 34;The secondary temperature increasing module 40 includes through copper pipe connection secondary compressor 41, secondary condenser 42, secondary throttle valve 43 and secondary evaporator 44;The tertiary temperature increasing module 50 includes through copper pipe connection tertiary compressor 51, tertiary condenser 52, tertiary throttle valve 53 and tertiary evaporator 54.

[0025] The device housing 10 is internally provided with a temperature-increasing air duct 60 and a temperature-reducing air duct 70, the heat pipe pre-cooling end 21, the first-stage evaporator 34, the second-stage evaporator 44, the heat pipe re-heating end 22, the third-stage condenser 52, the second-stage condenser 42 and the first-stage condenser 32 are sequentially arranged in the temperature-increasing air duct 60, the temperature-increasing air duct 60 is provided with an air return port 61 at one end close to the heat pipe pre-cooling end 21 and an air supply port 62 at the other end, and the third-stage evaporator 54 is arranged in the temperature-reducing air duct 70, and the NMP recovery device 63 is arranged below the first-stage evaporator 34 and the second-stage evaporator 44.

[0026] The equal-enthalpy temperature-increasing heat source device for NMP efficient recovery provided by the utility model adopts heat pipe heat recovery technology, which is a kind of physical phenomenon that utilizes the evaporation and condensation of working medium in itself to carry out heat transfer, and does not need other components and energy loss.The heat pipe pre-cooling end 21 and the heat pipe re-heating end 22 of the heat pipe recovery module 20 are connected by pipeline, when higher temperature air passes through the heat pipe pre-cooling end 21, the working medium of the heat pipe pre-cooling end 21 changes from liquid state to gaseous state, the pressure rises, and reaches the heat pipe re-heating end 22 through the upper connecting pipeline, and the temperature of the passing higher temperature air decreases, when lower temperature air passes through the heat pipe re-heating end 22, the working medium of the heat pipe pre-cooling end 21 condenses, the temperature decreases, and returns to the heat pipe pre-cooling end 21 through the lower connecting pipeline, and the temperature of the passing lower temperature air rises, and so on, through the change of the working medium in itself, heat exchange is carried out with the passing air, without increasing other energy consumption, waste heat is recycled, and high heat recovery efficiency is achieved.

[0027] The first-stage compressor 31, the first-stage condenser 32, the first-stage throttle valve 33 and the first-stage evaporator 34 in the first-stage temperature-increasing module 30 are connected by copper pipes to form a first-stage refrigeration cycle system, the compressor 31 compresses low-temperature and low-pressure refrigerant to form high-temperature and high-pressure gaseous refrigerant, the gaseous refrigerant is condensed into liquid refrigerant by releasing heat through the first-stage condenser 32, and the liquid refrigerant is cooled and decompressed through the first-stage throttle valve 33 to reach the first-stage evaporator 34 to absorb heat, and the liquid refrigerant returns to the compressor 31 as low-temperature and low-pressure gaseous refrigerant, in the process of repeated circulation, the air passing through the first-stage condenser 32 is heated, the air passing through the first-stage evaporator 34 is cooled, and after reaching the dew point temperature, the water vapor in the air is condensed into liquid water, and the NMP dissolved in the water forms an organic solution with the liquid water and is collected in the NMP recovery device 63, so that the NMP recovery function is realized.

[0028] The isenthalpic temperature increasing mechanism refers to a process of transferring heat to an object through an isenthalpic process to increase the temperature of the object. The isenthalpic process refers to a process in which the system does not do work on the outside world when heated, and the enthalpy of the system increases at the same time. The isenthalpic temperature increasing technology adopts an energy closed cycle, and through starting energy and supplementing operation loss, the energy closed cycle is realized. The air outlet 61 of the NMP efficient recovery isenthalpic temperature increasing heat source equipment is communicated with the air outlet pipeline of the coating machine room, the air inlet 62 is communicated with the air inlet pipeline of the coating machine room, and the energy closed cycle is formed, only a small amount of electric energy is provided to the first temperature increasing module 30, the second temperature increasing module 40 and the third temperature increasing module 50, the waste heat is recycled and utilized, and the high-temperature air is converted into the coating machine room to continue the drying process, and the energy efficiency ratio is high.

[0029] During the operation of the NMP efficient recovery isenthalpic temperature increasing heat source equipment, the NMP-containing high-temperature waste gas (about 110 DEG C) sent back by the coating machine room reaches the heat pipe pre-cooling end 21 through the air return port 61, exchanges heat with the working medium in the heat pipe pre-cooling end 21, and the temperature of the NMP waste gas decreases (about 90 DEG C). After heat absorption of the first evaporator 34 and the second evaporator 44, the temperature of the NMP waste gas decreases twice (about 30 DEG C), and at the same time, the water vapor in the NMP waste gas is condensed, so that most of the NMP dissolved in water is collected into the NMP recovery device 63. Through two times of temperature reduction, the NMP recovery efficiency is high. The low-concentration NMP waste gas exchanges heat with the working medium in the heat pipe reheating end 22, and the temperature of the low-concentration NMP waste gas increases (about 50 DEG C). After heat release of the third condenser 52, the second condenser 42 and the first condenser 32, the temperature of the low-concentration NMP waste gas increases by three stages (about 140 DEG C), and is sent into the coating machine room for use in the drying process of the coating machine room.

[0030] The NMP efficient recovery isenthalpic temperature increasing heat source equipment recovers the high-temperature NMP waste gas in the coating machine room through the heat pipe recovery module 20, has high recovery efficiency, and heats the high-temperature waste gas by the first temperature increasing module 30, the second temperature increasing module 40 and the third temperature increasing module 50 to obtain high-temperature drying gas for use in the drying process of the coating machine room. The heating energy efficiency ratio of the whole equipment is high, a large amount of energy is saved, and the economic value is high. The NMP waste gas is dehumidified by condensation, the NMP organic matter in the NMP waste gas is recovered, the whole process realizes closed cycle, the NMP waste gas is prevented from being discharged to pollute the environment, and the environmental protection performance is good.

[0031] Specifically, the temperature increasing air duct 60 is horizontally arranged, the air supply fan 64 is arranged at the air supply port 62, and the windward surfaces of the heat pipe pre-cooling end 21, the first evaporator 34, the second evaporator 44, the heat pipe reheating end 22, the third condenser 52, the second condenser 42 and the first condenser 32 are vertically arranged. The air duct arranged in this way is linear, the air resistance is small, unnecessary heat loss is reduced, and the heat exchange efficiency of the whole device is high.

[0032] Specifically, the system cavity 80 is arranged in the device shell 10 and is separated from the temperature increasing air duct 60, and the first compressor 31, the first throttle valve 33, the second compressor 41, the second throttle valve 43, the third compressor 51 and the third throttle valve 53 are arranged in the system cavity 80. The heat pipe pre-cooling end 21, the first evaporator 34, the second evaporator 44, the heat pipe reheating end 22, the third condenser 52, the second condenser 42 and the first condenser 32 in the temperature increasing air duct 60 and the surface of the copper pipe are subjected to NMP anti-corrosion treatment. Since NMP has a certain corrosive effect on copper metal, NMP waste gas is easy to corrode the copper pipe and the heat exchanger after long-term use. By separating the heat exchanger from other refrigeration system components and subjecting the heat exchanger and the copper pipe to anti-corrosion treatment, the device has good durability.

[0033] Specifically, the air inlet end of the temperature decreasing air duct 70 is in communication with the atmosphere, and the air outlet end is in communication with the indoor environment. When the air temperature is high, the temperature decreasing air duct 70 sends the air in the environment into the indoor environment after decreasing the temperature, so that the production personnel have a more comfortable environment, and the function of the device is diversified.

[0034] Specifically, the NMP recovery device 63 includes a water pan 631 arranged directly below the first evaporator 34 and the second evaporator 44. The water pan 631 is connected with a liquid storage container 632 arranged outside the device shell 10, so that the more concentrated NMP solution condensed in the liquid storage container 632 can be recycled and utilized, and the manufacturing cost of the enterprise is reduced.

[0035] In summary, the device comprises a heat pipe recovery module, a first temperature increasing module, a second temperature increasing module and a third temperature increasing module. The heat pipe recovery module is in a U shape and comprises a heat pipe pre-cooling end and a heat pipe reheating end arranged at two ends correspondingly. The first temperature increasing module comprises a first compressor, a first condenser, a first throttle valve and a first evaporator connected by a copper pipe. The second temperature increasing module comprises a second compressor, a second condenser, a second throttle valve and a second evaporator connected by a copper pipe. An NMP recovery device is arranged below the first evaporator and the second evaporator. The NMP high-efficiency recovery isotherm temperature increasing heat source device has the advantages that NMP can be efficiently recovered by cooling NMP waste gas, the recovered NMP waste gas is sent into a coating machine room by the heat pipe technology and the three-stage temperature increasing system, the energy saving effect is excellent, NMP waste gas is not discharged to the outside during the whole operation process of the device, and the device has good environmental protection performance.

[0036] It is to be understood that all the improvements and changes that can be added to the above-described explanation are to be considered as belonging to the scope of the present invention, as defined by the following claims.

Claims

1. An isenthalpic temperature-increasing heat source device for efficient recovery of NMP, characterized by comprising: The utility model relates to a heat pipe recycling device for NMP recovery and temperature increasing, comprising: a device shell, in which a heat pipe recycling module, a first-stage temperature increasing module, a second-stage temperature increasing module and a third-stage temperature increasing module are arranged; the heat pipe recycling module is in a U shape, comprising a heat pipe pre-cooling end and a heat pipe reheating end arranged at two ends respectively; the first-stage temperature increasing module comprises a first-stage compressor, a first-stage condenser, a first-stage throttling valve and a first-stage evaporator connected by copper pipes; the second-stage temperature increasing module comprises a second-stage compressor, a second-stage condenser, a second-stage throttling valve and a second-stage evaporator connected by copper pipes; the third-stage temperature increasing module comprises a third-stage compressor, a third-stage condenser, a third-stage throttling valve and a third-stage evaporator connected by copper pipes; the device shell is provided with a temperature increasing air duct and a temperature decreasing air duct, the heat pipe pre-cooling end, the first-stage evaporator, the second-stage evaporator, the heat pipe reheating end, the third-stage condenser, the second-stage condenser and the first-stage condenser are arranged in the temperature increasing air duct in sequence, one end of the temperature increasing air duct close to the heat pipe pre-cooling end is provided with an air return port, the other end is provided with an air supply port, the third-stage evaporator is arranged in the temperature decreasing air duct, and the NMP recovery device is arranged below the first-stage evaporator and the second-stage evaporator.

2. The isenthalpic heat boosting heat source apparatus for efficient recovery of NMP according to claim 1, characterized by: The temperature increasing air duct is arranged horizontally, an air supply fan is arranged at the air supply port, and the windward surfaces of the heat pipe pre-cooling end, the first-stage evaporator, the second-stage evaporator, the heat pipe reheating end, the third-stage condenser, the second-stage condenser and the first-stage condenser are arranged vertically.

3. The isenthalpic heat boosting heat source apparatus for efficient recovery of NMP as claimed in claim 1, wherein: The device shell is provided with a system cavity separated from the temperature increasing air duct, and the first-stage compressor, the first-stage throttling valve, the second-stage compressor, the second-stage throttling valve, the third-stage compressor and the third-stage throttling valve are arranged in the system cavity.

4. The isenthalpic boosted heat source apparatus for efficient NMP recovery of claim 3, wherein: The heat pipe recycling module, the first-stage evaporator, the second-stage evaporator, the third-stage condenser, the second-stage condenser, the first-stage condenser and the surfaces of the copper pipes in the temperature increasing air duct are subjected to NMP corrosion prevention treatment.

5. The isenthalpic boosted heat source apparatus for efficient NMP recovery of claim 3, wherein: The air inlet end of the temperature decreasing air duct is communicated with the atmosphere, and the air outlet end is communicated with the indoor environment.

6. The isenthalpic boosted heat source apparatus for efficient NMP recovery of claim 1, wherein: The NMP recovery device comprises a water pan arranged directly below the first-stage evaporator and the second-stage evaporator.

7. The isenthalpic boosted heat source apparatus for efficient NMP recovery of claim 6, wherein: The water pan is connected with a liquid storage container arranged outside the device shell.

Images