TWI668400B - Closed heat pump condensing heat recovery drying system - Google Patents

Abstract

A closed heat pump condensation heat recovery drying system comprises a condensation heat recovery module and at least one dehumidification heat pump module. The condensing heat recovery module includes at least one air outlet, and the at least one dehumidification heat pump module includes a condenser disposed at an air outlet of the condensing heat recovery module. The invention has the following advantages: the dehumidification performance ratio can reach 4~5 kilograms per degree of electric water removal, energy saving can be more than 25%, and the cooling water pipeline is only concentrated on the condensation heat recovery module, saving pipeline cost and short installation period, condensation The heat recovery module is installed at the feeding end, and the material is heated and heated by the condensation heat of other dehumidification heat pump modules, and the drying efficiency is less affected by the external environment temperature.

Description

Closed heat pump condensing heat recovery drying system

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

Closed-type heat pump low-temperature belt dryer (low-temperature drying) has many advantages such as high safety and good energy saving due to its odor emission and drying process, so it is widely used in the market.

Because the heat pump low-temperature belt dryer adopts the closed drying mode, the system needs to discharge the waste heat from the compressor after the work is done in the dry operation process. The waste heat discharged is generally treated by water cooling and cooling, and condensing hot air cooling, which requires additional energy consumption. In the existing equipment, the above-mentioned waste heat is not effectively utilized, and the discharged waste heat taste is high (refer to the water temperature or the temperature of the wind temperature is high).

In order to solve the above technical defects, multi-effect condensing heat recovery technology has appeared on the market. The multi-effect condensing heat recovery technology uses heat pump compressor to perform heat recovery after work and condensing heat to dry the material, 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 high application value. However, the conventional 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 complicated , many pipelines and large installation workload; (4) more structures, components and higher cost.

Therefore, the object of the present invention is to overcome the deficiencies of the above-mentioned technologies, and to provide a closed heat pump condensation heat recovery drying system which is energy-saving and high-efficiency, simple in structure, and free from odor emission.

Therefore, the closed heat pump condensation heat recovery drying system of the present invention comprises a condensation heat recovery module and at least one dehumidification heat pump module. The condensing 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 condensing heat recovery module.

The utility model has the advantages that the dehumidification performance ratio can reach 4~5 kilograms per degree of electric water removal, and energy saving can be more than 25%, and the cooling water pipeline is only concentrated on the condensation heat recovery module, saving pipeline cost and short installation period, and condensing The heat recovery module is installed at the feeding end, and the material is heated and heated by the condensation heat of other dehumidification heat pump modules, and the drying efficiency is less affected by the external environment temperature.

Referring to FIG. 1 , FIG. 2 , and FIG. 3 , an embodiment of the closed heat pump condensation heat recovery drying system of the present invention comprises a condensation heat recovery module 1 and a second dehumidification heat pump module 2 . The condensing heat recovery module 1 includes two condensing 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 a duct (indicated by an arrow line in the figure), and one of the cold sides B1 of the regenerative device 112 passes through the duct (in the figure) Connected to the additional condenser 111, 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 and a cooling water inlet 31 and a cooling water outlet 32 are connected. Connected 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 machine 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 The inlets of the compressor 214 are connected. In one of the refrigeration units 21 of each dehumidification heat pump module 2, the condenser 212A and the evaporator 213A of one of the refrigerant mechanisms 211 are a primary condenser and a primary evaporator, respectively. One of the refrigerant units 211 of the other refrigeration unit 21, the condenser 212B and the evaporator 213B are a secondary condenser and a secondary evaporator, respectively. The condensers 212A, which are primary condensers, are each equipped with a circulating fan 33 for forming an internal gas heat exchange cycle. The condensers 212B, which are secondary condensers, are respectively installed in the two air outlets 113 of the two condensation heat recovery units 11, and correspond to the air outlets 113 through the air ducts and the heat recovery device 112. The side B2 is connected, and the air from the condenser 212B is led to the air outlet 113 each provided with a blower 34.

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

It should be noted that, in this embodiment, the regenerator 221 and the regenerator 112 are plate-fin heat regenerators, that is, plate-fin heat exchangers. The plate-fin regenerator consists of a partition plate, a fin, a seal, and a baffle. A fin and a baffle are placed between adjacent partitions to form an interlayer, and the sandwiches are stacked and welded to form a whole bundle. With the necessary head support. The fins may be straight fins, serrated fins, porous fins, corrugated fins. The evaporator 213 is a fin-and-tube evaporator. The finned tube evaporator consists of a base pipe and fins, and the fins are mounted on the base pipe; the base pipe is made of a copper tube or an internally threaded copper tube; the fins are corrugated sheets of aluminum or copper material, skylights or corrugated skylights. formula. The additional condenser 111 and the condenser 212 are fin-and-tube heat exchangers; the fin-and-tube heat exchanger is composed of a base pipe and fins, and the fins are mounted on the base pipe; the base pipe is made of a copper tube Or internally threaded copper pipe; the fins are corrugated sheets of aluminum or copper, skylight or corrugated skylights. The water receiving tray can be made of corrosion-resistant aluminum or stainless steel; the condensate drain can be made of hot-dip galvanized steel or stainless steel, and has a trap. The condenser 212A, which is a primary condenser, may be of a shell-and-tube type, a brazed plate or a sleeve type, and the water flow should be considered for corrosion resistance.

Referring to FIG. 4, the 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 feeding end 41 is provided for the condensing heat recovery module 1 for preheating the wet material of the feeding end 41 by using condensing waste heat to prevent the drying process from being affected by the original temperature of the wet material (ie, the outside world) Environmental temperature impact), it should be specially noted that FIG. 4 is a view of a condensing heat recovery module 1 mated with three dehumidification heat pump modules 2. A belt drying device is also disposed in the casing 4 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 a thermal insulation board, and the thermal insulation board is installed outside the bracket to form an internal closed space, and the thermal insulation layer of the thermal insulation board has a thickness of not less than 25 mm. The inner layer is a hot-dip galvanized steel sheet, aluminum sheet or stainless steel sheet with good corrosion resistance. The bracket is made of steel, sheet metal or aluminum alloy. An instrument panel is disposed on the housing 4 to monitor the operating state of each device during operation. The instrument panel can be equipped with parameters such as drying room temperature, humidity, outlet air temperature, power supply indication, compressor operation, fan operation, auxiliary fan operation, indication setting operation, stop button, fan manual, automatic button fault indication and re-setting. A control box is arranged in the bracket and the outer casing, and a control function module including a compressor, a fan strong electric control device, and dehumidification, refrigeration, heating, ventilation, and the like can be disposed in the control box.

The principle of each medium flow of the present invention is as follows:

First, the refrigerant process principle (refrigerant contains inorganic compounds, fluoride pure working fluid, hydrocarbons or mixed refrigerant)

(1.1) No. 1 first-stage refrigerant flow: The high-temperature and high-pressure superheated medium gas from the first-stage compressor 214 of No. 1 forms a saturated or supercooled liquid through the first-stage condenser 212 of No. 1, 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, liquid mixture, and then through the No. 1 primary evaporator 213, No. 1 primary heat exchanger 216 to form a low temperature and low pressure superheated gas back Go to the first stage 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 forms a saturated or supercooled liquid through the No. 1 secondary condenser 212, 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, liquid mixture, and then through the No. 1 secondary evaporator 213, No. 1 secondary heat exchanger After 216, a 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 becomes saturated or supercooled liquid after passing through the No. 2 primary condenser 212, and then passes through No. 2 primary heat exchanger No. 216 and No. 2 The first stage filter 217, the first stage expansion valve 215 (thermal or electronic expansion valve) forms a low pressure gas and liquid mixture, and then passes through the first stage evaporator 213, the first stage heat exchanger 216, and then forms a low temperature and low pressure superheated gas. Go to the first stage 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 and becomes a saturated or supercooled liquid, and then passes through the No. 2 secondary heat exchanger. 216, 2nd secondary filter 217, 2nd secondary expansion valve 215 (thermal or electronic expansion valve) to form a low pressure gas, liquid mixture, and then through the No. 2 secondary evaporator 213, No. 2 secondary heat exchanger 216 After forming the low temperature and low pressure superheated gas, it returns to the second stage compressor 214.

Second, the principle of air flow

(1.1) Air flow No. 1 (dehumidification air circulation): The return air of the drying chamber flows through the primary air filter 35 and the secondary air filter 35, and then enters the hot side C1 of the regenerator 221 of No. 1, and then passes through the first-stage evaporator 213 of 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 driving of the No. 1 blower 34 through the No. 1 secondary condenser 212B.

(1.2) Air flow No. 2 (dehumidification air circulation): The return air of the drying chamber flows through the primary air filter 35 and the secondary air filter 35 to enter the hot side C1 of the regenerator No. 2, and then passes through the first stage evaporator 213, 2 The secondary evaporator 213 returns to the hot side C2 of the No. 2 regenerator 221, and then returns to the drying chamber via the No. 2 secondary condenser 212B under the drive of the No. 2 blower 34.

(1.3) Loop wind circulation: The return air of the drying chamber flows through the No. 2 primary condenser 212A, 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, through the hot side C2 of the plate-fin regenerator 221 to cool, and then through the first-stage evaporator 213 for a first-stage cooling to form condensed water, and then through the secondary evaporator 213 The second stage cooling is performed to form condensed water, and the temperature is raised by the cold side D2 of the plate fin type regenerator 221, and then the air is driven by the blower 34 through the secondary condenser 212.

In summary, the present invention performs heat recovery by using concentrated heat of condensation on the residual heat of the compressor 214 after work, which can meet the needs of closed water cooling; can save power consumption in heat pump low-temperature belt drying, and save power consumption. More than 20%; save at least one heat pump system, simplify the structure of the cooling system, facilitate on-site installation of equipment, save installation costs; use the condensing waste heat to preheat the wet end of the feed end 41, to avoid the influence of the wet process on the original temperature of the wet material (ie, the influence of the ambient temperature), it is indeed possible to achieve the object of the present invention.

However, the above is only the embodiment of the present invention, and the scope of the invention is not limited thereto, and all the equivalent equivalent changes and modifications according to the scope of the patent application and the patent specification of the present invention are still The scope of the invention is covered.

1‧‧‧Condensation heat recovery module

11‧‧‧Condensation heat recovery unit

111‧‧‧Additional condenser

112‧‧‧Reheating device

113‧‧‧air 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‧‧‧Circular fan

34‧‧‧Air blower

35‧‧‧Air filter

4‧‧‧Shell

41‧‧‧ Feeding 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 advantages of the present invention will be apparent from the embodiments of the present invention, wherein: Figure 1 is a schematic view showing an embodiment of the closed heat pump condensation heat recovery drying system of the present invention; FIG. 3 is a schematic view showing a dehumidification heat pump module in the embodiment; and FIG. 4 is a schematic view showing the embodiment disposed in a casing. .

Claims (8)

A closed heat pump condensation heat recovery drying system comprising: a condensation heat recovery module comprising at least one air outlet, and at least one condensation heat recovery unit, the at least one condensation heat recovery unit having at least one additional condenser and one a heat device, wherein a hot side of the heat recovery device is coupled to the at least one additional condenser, a cold side of the heat recovery device is coupled to the at least one condenser, and an outlet of the at least one condenser is coupled to the at least one condenser And an at least one dehumidification heat pump module comprising at least one condenser disposed in the at least one air outlet of the condensing heat recovery module, at least one refrigerant mechanism, and at least one air unit, the at least one The refrigerant mechanism has a condenser, an evaporator, a compressor, and an expansion valve, an outlet of the compressor is connected to an inlet of the condenser, and the expansion valve is connected to an outlet of the condenser And an inlet of the evaporator, the outlet of the evaporator is connected to the compressor inlet, the at least one air unit has a regenerator and an inlet duct, wherein the regenerator One hot side is connected to the evaporator, the other hot side is connected to the inlet duct, and the two cold sides of the regenerator are respectively connected to the evaporator and the condenser, the condenser The discharged air is directed to the air outlet. The closed heat pump condensing heat recovery drying system according to claim 1, wherein the condensing heat recovery module comprises two condensing heat recovery units, and the additional condensers of the condensing heat recovery unit are connected to each other in series. The closed heat pump condensation heat recovery drying system according to claim 1, wherein the at least one dehumidification heat pump module comprises two refrigeration units and two empty A gas unit, each refrigeration unit having two of said refrigerant mechanisms. The closed heat pump condensation heat recovery drying system according to claim 3, comprising a second dehumidification heat pump module, wherein a condenser of one of the refrigeration units of each of the dehumidification heat pump modules is installed in the condensation recovery mode The outlet of the group. The closed heat pump condensation heat recovery drying system according to claim 4, wherein a circulation fan is installed on a condenser of one of the refrigeration units of the other refrigeration unit of each dehumidification heat pump module. The closed heat pump condensing heat recovery drying system according to claim 1, wherein the at least one refrigeration mechanism further has a heat exchanger connecting the evaporator and the compressor. The closed heat pump condensing heat recovery drying system according to claim 1, wherein the at least one refrigeration mechanism further has a heat exchanger connecting the evaporator and the compressor, and a heat exchange is provided And a filter between the expansion valve. The closed heat pump condensing heat recovery drying system of claim 5, further comprising a casing sealed for the condensing heat recovery module and the at least one dehumidification heat pump module and having a feed end, The feed end is provided for the condensation heat recovery module.