TW202009435A - Airtight heat pump drying system with cold condensing and heat recycling having advantages of saving energy for 25% or higher, saving the cost of pipeline and shortening the installation time, and preventing the drying efficiency from being affected by the external environment - Google Patents

Abstract

Provided is an airtight heat pump drying system with cold condensing and heat recycling, which includes a cold condensing and heat recycling module and at least one dehumidifying heat pump module. The cold condensing and heat recycling module has at least one wind outlet. The at least one dehumidifying heat pump module has a condenser disposed in the wind outlet of the cold condensing and heat recycling module. The present invention is advantageous in that: a dehumidifying performance ratio may reach to dehumidify four to five kilos of water per kilowatt-hour, thereby saving energy for 25% or higher; a cooling water pipeline is only distributed in the cold condensing and heat recycling module, so as to save the cost of pipeline and shorten the installation time; and the cold condensing and heat recycling module is disposed at a feeding end, and condensed heat of other dehumidifying heat pump modules is used to perform a temperature raising process on an object, so that the drying efficiency is less affected by the external environment.

Description

Closed heat pump condensing heat recovery and drying system

The invention relates to a drying device, in particular to a closed heat pump condensing heat recovery and drying system.

The closed heat pump low temperature belt dryer (low temperature drying) has the advantages of high safety and good energy saving due to its odor emission and drying process, so it is currently widely used in the market.

Since the heat pump low-temperature belt dryer uses a closed drying mode, the system needs to discharge the waste heat converted by the compressor to the outside during the drying operation. The waste heat discharged is generally treated by water cooling and condensing hot air cooling, which requires additional energy consumption. In the existing equipment, the above-mentioned waste heat is not effectively used, and the waste heat discharged has a high taste (referred to as a high temperature of water temperature or wind temperature).

In order to solve the above technical defects, a multi-effect condensation heat recovery technology has appeared on the market. The multi-effect condensation heat recovery technology uses a heat pump compressor to work the condensation heat to recover the heat and dry the materials, thereby saving electricity costs during operation and saving electricity. It consumes more than 25% and at the same time saves the cost of the heat pump low temperature belt drying system, and has a high application value. However, the current traditional heat pump low-temperature belt drying technology has the following problems: (1) the residual heat converted by the compressor after work is directly discharged to the outside without heat recovery; (2) high energy consumption; (3) the cooling system is more complicated , Many pipelines and large installation workload; (4) Structure, many components and high cost.

Therefore, the purpose of the present invention is to overcome the deficiencies of the above technology and provide a closed heat pump condensing heat recovery and drying system with energy saving, high efficiency, simple and economical structure, and no odor discharge.

Therefore, the closed heat pump condensing heat recovery and drying system of the present invention includes a condensing heat recovery module and at least one dehumidification heat pump module. The condensation heat recovery module includes at least one air outlet. The dehumidification heat pump module includes at least one condenser disposed at the at least one air outlet of the condensation heat recovery module.

The effect of the present invention is that the dehumidification performance ratio can reach 4 to 5 kg per degree of electrical dewatering, which can save energy by more than 25%. The cooling water pipeline is only concentrated on the condensing heat recovery module, which saves the cost of the pipeline and the installation cycle is short, and the condensation The heat recovery module is installed at the feed end, and the condensation heat of other dehumidification heat pump modules is used to heat the material, and the drying efficiency is less affected by the external ambient temperature.

1, 2, and 3, an embodiment of the closed heat pump condensation heat recovery and drying system of the present invention includes a condensation heat recovery module 1 and two dehumidification heat pump modules 2. The condensation heat recovery module 1 includes two condensation heat recovery units 11. Each condensing heat recovery unit 11 has an additional condenser 111, a heat recovery device 112, and an air outlet 113. One of the hot sides A1 of the regenerative device 112 is connected to the additional condenser 111 through an air pipe (indicated by an arrow line in the figure), and one of the cold sides B1 of the regenerative device 112 passes through the air pipe (in the figure (Indicated by an arrow line) connected to the additional condenser 111, and the other cold side B2 corresponds to the air outlet. The additional condensers 111 of the condensing heat recovery unit 11 are connected in series, each additional condenser 111 is connected to a cooling circulation pipe 110, and the cooling circulation pipe 110 is connected to a cooling water inlet 31 and a cooling water outlet 32 Connect to form a cooling cycle.

Each dehumidification heat pump module 2 includes two refrigeration units 21 and two air units 22. Each refrigeration unit 21 has two refrigerant mechanisms 211, each refrigerant mechanism 211 has a condenser 212, an evaporator 213, a compressor 214, an expansion valve 215, a connection to the evaporator 213 and the compression The heat exchanger 216 of the engine 214, and a filter 217 disposed between the heat exchanger 216 and the expansion valve 215. The outlet of the condenser 212 is connected to the inlet of the evaporator 213 through the expansion valve 215, the inlet of the condenser 212 is connected to the outlet of the compressor 214, and the outlet of the evaporator 213 is connected to all The inlet of the compressor 214 is connected. In one of the refrigeration units 21 of each dehumidification heat pump module 2, the condenser 212A and the evaporator 213A of one refrigerant mechanism 211 are a primary condenser and a primary evaporator, respectively. In one refrigerant mechanism 211 of the other refrigeration unit 21, the condenser 212B and the evaporator 213B are a secondary condenser and a secondary evaporator, respectively. Each of the condensers 212A, which is a primary condenser, is equipped with a circulation fan 33 for forming an internal gas heat exchange cycle. The condenser 212B, which is a two-stage condenser, is installed at two air outlets 113 of the two condensing heat recovery units 11 respectively, and corresponds to the cooling of the air outlet 113 through the air duct and the regenerative device 112 Side B2 is connected, and the air from the aforementioned condenser 212B is directed to the air outlets 113 each provided with a blower 34.

Each air unit 22 has a regenerator 221 and an air inlet pipe 222. One of the hot sides C1 of the regenerator 221 is connected to the air inlet pipe 222 through an air filter 35, and the other hot side C2 is connected to one of the dehumidification heat pump modules through an air pipe (indicated by arrow lines in the figure) 2, the two evaporators 213A, 213B are connected, and one of the cold sides D1 of the regenerator 221 is connected to the condenser 212B, which is a secondary condenser, through the air duct (indicated by the arrow line in the figure), and the other cold side D2 is connected to the two evaporators 213A and 213B through an air duct (indicated by arrow lines in the figure).

In particular, in this embodiment, the regenerator 221 and the regenerator 112 are plate-fin regenerators, that is, plate-fin heat exchangers. The plate-fin regenerator consists of baffles, fins, seals, and deflectors. Place the fins and deflectors between adjacent baffles to form an interlayer, layer the interlayers together, and weld them into a whole to form a plate bundle , With the necessary head support. The fins may be straight fins, serrated fins, porous fins, or corrugated fins. The evaporator 213 is a finned tube evaporator. The finned tube evaporator is composed of a base tube and fins. The fins are installed on the base tube; the base tube is a copper tube or an internally threaded copper tube; the fins are corrugated aluminum or copper materials, skylight or corrugated skylight formula. The additional condenser 111 and the condenser 212 are finned tube heat exchangers; the finned tube heat exchanger is composed of a base tube and fins, and the fins are installed on the base tube; the base tube is a copper light tube Or internally threaded copper tube; fins are corrugated aluminum or copper material, skylight type or corrugated skylight type. The water receiving tray can be made of corrosion-resistant aluminum plate or stainless steel plate; the condensate drain pipe can be made of hot-dip galvanized steel pipe or stainless steel pipe, and it has a water elbow setting. The condenser 212A, which is a first-level condenser, may be a shell-and-tube type, a brazed plate type, or a sleeve type, and its water flow should consider corrosion resistance.

Referring to FIG. 4, this embodiment may further include a housing 4 that seals the condensation heat recovery module 1 and the dehumidification heat pump module 2 and has a feed end 41. The feed end 41 is provided for the condensing heat recovery module 1 to preheat the wet material of the feed end 41 with the residual heat of condensation to avoid the drying process being affected by the original temperature of the wet material (i.e. outside (Environmental temperature effect). It should be noted that, in FIG. 4, one condensation heat recovery module 1 is combined with three dehumidification heat pump modules 2. The casing 4 is also provided with a belt drying device, which is used for low-temperature drying of the materials in the casing 4.

It should be particularly noted that, in this embodiment, the housing 4 includes a bracket and an insulation board, the insulation board is installed outside the bracket to form an internal enclosed space, and the thickness of the insulation layer of the insulation board is not less than 25 mm. The inner layer plate is a hot-dip galvanized steel plate, aluminum plate or stainless steel plate with good corrosion resistance. The bracket is made of profiled steel, sheet metal processing or aluminum alloy profile. An instrument panel is provided on the housing 4 to monitor the operating status of each device during the work. The instrument panel can be set with parameters such as drying room temperature, humidity, outlet air temperature, power indication, compressor operation, fan operation, auxiliary fan operation, indication setting operation, stop button, fan manual, automatic button fault indication and reset. A control box is arranged in the bracket and the outer casing, and the control box may be provided with a control function module including a compressor, a fan strong power control device, and dehumidification, refrigeration, heating, ventilation and other control functions.

The principles of the various media processes of the present invention are as follows:

1. Refrigerant flow principle (refrigerant contains inorganic compound, pure working substance of fluoride, hydrocarbon or mixed refrigerant)

(1.1) No. 1 primary refrigerant process: the high-temperature and high-pressure superheated medium gas from No. 1 primary compressor 214 passes through No. 1 primary condenser 212 to form a saturated or supercooled liquid, and then passes through No. 1 primary heat exchanger 216, No. 1 Primary filter 217, No. 1 primary expansion valve 215 (thermal or electronic expansion valve), the medium becomes a low-pressure gas and liquid mixture, and then passes through No. 1 primary evaporator 213, No. 1 primary heat exchanger 216 to form a low-temperature low-pressure superheated gas return To No. 1 primary compressor 214.

(1.2) No. 1 secondary refrigerant process: the high-temperature and high-pressure superheated medium gas from the No. 1 secondary compressor 214 passes through the No. 1 secondary condenser 212 to form a saturated or supercooled liquid, and then passes through the No. 1 secondary heat exchanger 216, No. 1 secondary filter 217, No. 1 secondary expansion valve 215 (thermal or electronic expansion valve), the medium forms a low-pressure gas and liquid mixture, and then passes through No. 1 secondary evaporator 213, No. 1 secondary heat exchanger After 216, low-temperature and low-pressure superheated gas is formed and returned to the No. 1 secondary compressor 214.

(2.1) No. 2 primary refrigerant process: the high-temperature and high-pressure superheated medium gas from the No. 2 primary compressor 214 passes through the No. 2 primary condenser 212 and becomes a saturated or supercooled liquid, and then passes through the No. 2 primary heat exchangers 216 and No. 2 The first-stage filter 217 and No. 2 first-stage expansion valve 215 (thermal or electronic expansion valve) form a low-pressure gas and liquid mixture, and then form a low-temperature low-pressure superheated gas after passing through the No. 2 first-stage evaporator 213 and No. 2 first-stage heat exchanger 216到2号 Primary compressor 214.

(2.2) No. 2 secondary refrigerant process: the high-temperature and high-pressure superheated medium gas from the No. 2 secondary compressor 214 passes through the No. 2 secondary condenser 212 to become a saturated or supercooled liquid, and then passes through the No. 2 secondary heat exchanger 216, No. 2 secondary filter 217, No. 2 secondary expansion valve 215 (thermal or electronic expansion valve) to form a low-pressure gas and liquid mixture, and then through No. 2 secondary evaporator 213, No. 2 secondary heat exchanger 216 After forming low-temperature and low-pressure superheated gas, it returns to No. 2 secondary compressor 214.

2. Air flow principle

(1.1) No. 1 air process (dehumidifying air circulation): the return air of the drying chamber flows through the primary air filter 35 and the secondary air filter 35, enters the hot side C1 of the recuperator 1 221, and then passes through the primary evaporator No. 1 The No. 1 secondary evaporator 213 returns to the hot side C2 of the No. 1 regenerator 221, and then returns to the drying chamber under the drive of the No. 1 secondary condenser 212B under the drive of the No. 1 blower 34.

(1.2) Air flow No. 2 (dehumidifying air circulation): The return air of the drying chamber flows through the primary air filter 35 and the secondary air filter 35 into the hot side C1 of the No. 2 regenerator, and then passes through the No. 2 primary evaporator 213, 2 The second-stage evaporator 213 returns to the hot side C2 of the second-stage regenerator 221, and then passes through the second-stage condenser 212B and is driven by the second-stage blower 34 to return to the drying chamber.

(1.3) Loop air circulation: the return air of the drying chamber flows through the No. 2 primary condenser 212A and the circulation fan 33, and then enters the drying chamber.

Third, the drying medium (air, etc.) process: the inlet air is hot and humid air, which is cooled by the hot side C2 of the plate-fin regenerator 221, and then cooled by the first-stage evaporator 213 to form condensate, and then passed by the second-stage evaporator 213 The secondary cooling is performed to form condensed water, the temperature is increased by the cold side D2 of the plate-fin regenerator 221, and then the wind is driven by the blower 34 through the secondary condenser 212.

In summary, the present invention adopts centralized condensation heat recovery for the heat converted by the compressor 214 after working, to meet the needs of closed water cooling; it can save the power consumption of the heat pump in the low-temperature belt drying and save the power consumption 20% or more; save at least one heat pump system, simplify the cooling system structure, facilitate equipment on-site installation, and save installation costs; use condensing waste heat to preheat the wet material at the feed end 41, to avoid the drying process from being affected by the original temperature of the wet material (That is, the temperature of the external environment), so it can indeed achieve the purpose of cost invention.

However, the above are only examples of the present invention, and should not be used to limit the scope of the present invention. Any simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the patent specification are still classified as This invention covers the patent.

1‧‧‧Condensation heat recovery module 11‧‧‧Condensation heat recovery unit 111‧‧‧Additional condenser 112‧‧‧‧Regeneration device 113‧‧‧Outlet 2‧‧‧Dehumidification heat pump module 21‧‧‧Refrigeration Unit 211‧‧‧Refrigerant mechanism 212‧‧‧Condenser 212A‧‧‧Condenser 212B‧‧‧‧Condenser 213‧‧‧Evaporator 213A‧‧‧Evaporator 213B‧‧‧Evaporator 214‧‧‧Compressor 215‧‧‧ Expansion valve 216‧‧‧ Heat exchanger 217‧‧‧ Filter 22‧‧‧Air unit 221‧‧‧Reheater 222‧‧‧Intake duct 31‧‧‧Cooling water inlet 32‧‧‧ Cooling water outlet 33 ‧ ‧ ‧ Circulation fan 34 ‧ ‧ ‧ blower 35 ‧ ‧ ‧ air filter 4 ‧ ‧ ‧ shell 41 ‧ ‧ ‧ feed end A1 ‧ ‧ ‧ hot side A2 ‧ ‧ ‧ hot side B1 ‧ ‧ ‧ Cold side B2‧‧‧cold side C1‧‧‧hot side C2‧‧‧hot side D1‧‧‧cold side D2‧‧‧cold side

Other features and functions of the present invention will be clearly presented in the embodiment with reference to the drawings, in which: FIG. 1 is a schematic diagram illustrating an embodiment of the closed heat pump condensing heat recovery and drying system of the present invention; FIG. 2 is a A schematic diagram illustrating a condensing heat recovery module in this embodiment; FIG. 3 is a schematic diagram illustrating a dehumidification heat pump module in this embodiment; and FIG. 4 is a schematic diagram illustrating that this embodiment is provided in a housing .

1‧‧‧Condensation heat recovery module

11‧‧‧Condensation heat recovery unit

113‧‧‧Outlet

2‧‧‧Dehumidification heat pump module

21‧‧‧Refrigeration unit

212‧‧‧Condenser

212A‧‧‧Condenser

212B‧‧‧Condenser

22‧‧‧Air unit

34‧‧‧Blower

Claims (10)

A closed-type heat pump condensing heat recovery and drying system includes: a condensing heat recovery module, including at least one air outlet; and at least one dehumidification heat pump module, including at least one of the at least one of the condensing heat recovery modules Condenser at the air outlet. The enclosed heat pump condensing heat recovery and drying system according to claim 1, wherein the condensing heat recovery module includes at least one condensing heat recovery unit, and the at least one condensing heat recovery unit has at least one additional condenser and one return Heat device, the hot side of the regenerative device is connected to the at least one additional condenser, the cold side of the regenerative device is connected to the at least one condenser, and the outlet of the at least one condenser is connected to the at least one An outlet. The enclosed heat pump condensing heat recovery and drying system according to claim 2, wherein the condensing heat recovery module includes two condensing heat recovery units, and the additional condensers of the condensing heat recovery unit are connected in series with each other. The sealed heat pump condensing heat recovery and drying system according to claim 2 or 3, wherein the at least one dehumidification heat pump module includes at least one refrigerant mechanism and at least one air unit, and the at least one refrigerant mechanism has a The condenser, an evaporator, a compressor, and an expansion valve, the compressor outlet is connected to the inlet of the condenser, the expansion valve is connected to the outlet of the condenser and the inlet of the evaporator , The outlet of the evaporator is connected to the inlet of the compressor, the at least one air unit has a regenerator and an air inlet pipe, one of the hot sides of the regenerator is connected to the evaporator, and the other One hot side is connected to the air inlet pipe, the two cold sides of the regenerator are respectively connected to the evaporator and the condenser, and the air discharged from the condenser is led to the air outlet. The sealed heat pump condensing heat recovery and drying system according to claim 4, wherein the at least one dehumidification heat pump module includes two refrigeration units and two air units, and each refrigeration unit has two of the refrigerant mechanisms . The enclosed heat pump condensing heat recovery and drying system as described in claim 5 includes two dehumidification heat pump modules, and the condenser of one of the refrigeration units in one of the refrigeration units of each dehumidification heat pump module is installed in the condensation recovery module The air outlet of the group. The enclosed heat pump condensing heat recovery and drying system as described in claim 6, wherein a circulating fan is installed on the condenser of one of the refrigerating units of the other refrigeration unit of each dehumidification heat pump module. The enclosed heat pump condensing heat recovery and drying system according to claim 4, wherein the at least one refrigeration mechanism further has a heat exchanger connected to the evaporator and the compressor. The sealed heat pump condensing heat recovery and drying system according to claim 4, wherein the at least one refrigeration mechanism further has a heat exchanger connected to the evaporator and the compressor, and a heat exchanger provided at the heat exchange And the filter between the expansion valve. The sealed heat pump condensing heat recovery and drying system according to claim 7, further comprising a housing sealed and provided for the condensing heat recovery module and the at least one dehumidification heat pump module and having a feed end, the The feed end is provided for the condensation heat recovery module.

Images