CN210741023U - Material drying system based on superheated steam - Google Patents
Material drying system based on superheated steam Download PDFInfo
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- CN210741023U CN210741023U CN201920892857.7U CN201920892857U CN210741023U CN 210741023 U CN210741023 U CN 210741023U CN 201920892857 U CN201920892857 U CN 201920892857U CN 210741023 U CN210741023 U CN 210741023U
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Abstract
The utility model discloses a material drying system based on superheated steam, relate to the material drying technical field of heat energy engineering, the material drying system includes the material stoving subsystem, the material stoving subsystem includes the material drying chamber, the material drying chamber is equipped with material inlet and material outlet, the material stoving subsystem still includes superheated steam circulating fan and superheated steam heater, the material drying chamber still is equipped with superheated steam inlet and superheated steam outlet, the superheated steam outlet is connected with the induction port of circulating fan through superheated steam circulating line; the exhaust port of the circulating fan is also connected with a secondary steam discharge pipeline for discharging secondary steam evaporated from the materials. The material is dried under the condition of isolating the infiltration of the outside air by adopting the circulating superheated steam to replace the hot air, thereby achieving the purpose of reducing the energy consumption of the material drying system based on the hot air.
Description
Technical Field
The utility model relates to a material drying technical field of heat energy engineering, in particular to material drying system based on superheated steam.
Background
The existing material drying system, including drying systems for wood, sludge, linen, medicines, food, paper, ceramics and the like, usually adopts steam or electric power to heat a large amount of outside air, then uses hot air to dry the materials, and then discharges two parts of heat along with the discharge of wet air after drying. Firstly, since the temperature of the discharged humid air is higher than that of the outside air, a large amount of sensible heat of the humid air is discharged; secondly, the secondary steam evaporated from the material has a large amount of latent heat to be discharged with the humid air. Therefore, the energy consumption of the existing hot air based material drying system is extremely high.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a material drying system based on superheated steam, the superheated steam through adopting closed cycle replaces hot-air to dry the material under the condition of isolated outside air infiltration to the secondary steam who comes out from the material evaporation when drying the material collects, then takes place and the evaporation heat source as second type absorption heat pump and effectively utilizes, thereby has reached the purpose that reduces greatly the material drying system energy consumption based on superheated steam.
The utility model mainly provides the following technical scheme:
the embodiment of the utility model provides a material drying system based on superheated steam, including the material stoving subsystem, the material stoving subsystem includes the material drying chamber, the material drying chamber is equipped with material entry and material export, the material stoving subsystem still includes superheated steam circulating fan and superheated steam heater, the material drying chamber still is equipped with superheated steam entry and superheated steam export, superheated steam export is connected with the induction port of superheated steam circulating fan through superheated steam circulating line, and the gas vent of superheated steam circulating fan is connected with the entry of superheated steam heater through superheated steam circulating line, and the export of superheated steam heater is connected with the superheated steam entry of material drying chamber through superheated steam circulating line; the exhaust port of the superheated steam circulating fan is also connected with a secondary steam discharge pipeline for discharging secondary steam evaporated from the material.
Preferably, a flow regulating valve is arranged on the secondary steam discharge pipeline.
Preferably, a throttle valve or a back pressure valve is arranged on a superheated steam circulating pipeline connecting a superheated steam outlet of the material drying chamber and an air suction port of the superheated steam circulating fan, and is used for keeping the pressure of the material drying chamber in a micro-positive pressure state.
Preferably, a pressure sensor is arranged at the upstream of the material drying chamber or the throttle valve, and the pressure displayed by the pressure sensor is higher than the atmospheric pressure by 0.01-2 kPa through adjusting the power of the superheated steam circulating fan, or/and the throttle valve or the back pressure valve, or/and the flow regulating valve of secondary steam, so that the outside air cannot enter the material drying chamber through the material inlet and the material outlet of the material drying chamber.
Preferably, the material drying system based on superheated steam of the utility model further comprises a second-class absorption heat pump subsystem, the second-class absorption heat pump subsystem comprises a generator, a condenser, an evaporator and an absorber, the generator is provided with a generating heat exchanger, the condenser is provided with a condensing heat exchanger, the evaporator is provided with an evaporating heat exchanger, the absorber is provided with an absorption heat exchanger, the generator and the condenser are communicated through a first working medium steam channel, the evaporator and the absorber are communicated through a second working medium steam channel, an absorption solution circulating pipeline is arranged between the absorber and the generator and used for circulating absorption solution between the absorber and the generator, the absorption solution circulating pipeline is provided with a solution heat exchanger for heat exchange between the low-temperature concentrated absorption solution output by the generator and the high-temperature dilute absorption solution output by the absorber, and a condensation working medium pipeline is arranged between the evaporator and the condenser and is used for guiding the condensation working medium in the condenser into the evaporator, and a secondary steam discharge pipeline is connected with inlets of the generation heat exchanger and the evaporation heat exchanger and is used for guiding secondary steam evaporated from materials into the generation heat exchanger and the evaporation heat exchanger as a generation and evaporation heat source of the second-type absorption heat pump subsystem.
Preferably, the material drying system based on superheated steam further comprises an absorption/compression combined type high-temperature heat pump subsystem, the high-temperature heat pump subsystem comprises a second-class absorption heat pump subsystem and a vapor compression heat pump subsystem, the second-class absorption heat pump subsystem comprises a generator, a condenser, an evaporator and an absorber, the condenser is provided with a condensing heat exchanger, the evaporator is provided with an evaporating heat exchanger, the absorber is provided with an absorption heat exchanger, the generator and the condenser are communicated through a first working medium vapor channel, the evaporator and the absorber are communicated through a second working medium vapor channel, an absorption solution circulating pipeline is arranged between the absorber and the generator and used for enabling absorption solution to circulate between the absorber and the generator, a solution heat exchanger is arranged on the absorption solution circulating pipeline and used for exchanging heat between low-temperature concentrated absorption solution output by the generator and high-temperature dilute absorption solution output by the absorber, a condensing working medium pipeline is arranged between the evaporator and the condenser and is used for guiding the condensing working medium in the condenser into the evaporator;
the generator comprises an absorption solution flash evaporation chamber, a generator spraying device, a solution spraying pipeline, a solution spraying pump and an external generation heat exchanger, wherein the external generation heat exchanger is arranged outside the absorption solution flash evaporation chamber;
the vapor compression type heat pump subsystem comprises a compressor, a throttle valve and a refrigerant circulating pipeline, wherein the vapor compression type heat pump subsystem takes the condensing heat exchanger as a compression evaporator thereof and takes the external generating heat exchanger as a compression condenser thereof, the refrigerant circulating pipeline on the exhaust port side of the compressor is connected with the heat fluid side of the external generating heat exchanger, the refrigerant circulating pipeline on the downstream of the throttle valve is connected with the inlet of the condensing heat exchanger, and the outlet of the condensing heat exchanger is connected with the refrigerant circulating pipeline on the suction port side of the compressor;
the secondary steam discharge pipeline is connected with an inlet of the evaporation heat exchanger and used for guiding secondary steam evaporated from materials into the evaporation heat exchanger as an evaporation heat source of the high-temperature heat pump subsystem.
Preferably, a superheated steam circulating pipeline of an exhaust port of the superheated steam circulating fan is connected with an inlet of the absorption heat exchanger, an outlet of the absorption heat exchanger is connected with an inlet of the superheated steam heater through a superheated steam pipeline, and high-temperature heat generated by the absorber is used for preheating the superheated steam.
Preferably, a superheated steam preheater is further arranged on a superheated steam pipeline connecting an exhaust port of the superheated steam circulating fan and the superheated steam heater, a hot-side fluid inlet of the superheated steam preheater is connected with an outlet of the absorption heat exchanger through a saturated steam pipeline, and saturated steam generated in the absorption heat exchanger is led into a heat fluid side of the superheated steam preheater as a preheating heat source of the superheated steam.
Preferably, the material drying chamber is provided with a material drying chamber, and the material drying chamber is provided with a material drying chamber.
Preferably, the superheated steam heater is a gas hot blast stove or an electric hot blast stove.
Compared with the prior art, the utility model, have following obvious advantage and beneficial effect:
the utility model discloses a material drying system based on superheated steam has not had the emission of humid air, and because the drying chamber keeps the pressure-fired, so neither has a large amount of steam to follow the cavity spills also rarely has air admission cavity and steam mixing. Therefore, most of secondary steam evaporated from the material is collected under the condition that almost no air is mixed, so that the obvious reduction of the saturation temperature of the secondary steam is avoided, and the latent heat of the secondary steam can be fully utilized by the second-type absorption heat pump at a higher temperature grade. Therefore, the utility model discloses a material drying system's based on superheated steam energy consumption compares with current material drying system based on hot-air and has obtained reduction by a wide margin. The utility model discloses the pressure that the pressure-fired of material drying chamber was provided through utilizing superheated steam circulating fan to set up the choke valve or the flow control valve on back pressure valve and the secondary steam discharge pipeline on the superheated steam circulating line of superheated steam export through adjusting and realize.
Because the utility model discloses can keep the drying chamber to be in the pressure-fired all the time, so the utility model discloses not only can adopt inclosed drying chamber, also can adopt to carry out the continuous dry, the material business turn over in succession promptly or the airtight drying chamber of non-of semi-continuous business turn over of material.
Still, because superheated steam's thermal conductivity and thermal power nature such as specific heat capacity are obviously superior to the air, consequently, the utility model discloses a material drying system based on superheated steam compares with current material drying system based on hot-air and has higher drying capacity, therefore also more high-efficient, and equipment also can be done compacter simultaneously.
For places without natural gas supply or where natural gas is high in price and electricity is low in cost, the absorption/compression composite high-temperature heat pump subsystem and the electric hot air furnace are adopted, so that the operation cost of material drying can be obviously reduced.
Moreover, because the secondary steam evaporated from the material is condensed and recovered in the second-class absorption heat pump, the utility model discloses still have the effect of water conservation and emission reduction.
Drawings
Fig. 1 is a schematic structural diagram of a superheated steam-based material drying system according to embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of a superheated steam-based material drying system according to embodiment 2 of the present invention;
fig. 3 is a schematic structural diagram of a superheated steam-based material drying system according to embodiment 3 of the present invention;
fig. 4 is a schematic structural diagram of a superheated steam-based material drying system according to embodiment 4 of the present invention;
fig. 5 is a schematic structural diagram of a superheated steam-based material drying system according to embodiment 5 of the present invention;
fig. 6 is a schematic structural diagram of a superheated steam-based material drying system according to embodiment 6 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following specific examples, which should not be construed as limiting the invention. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
As used herein, "slight positive pressure" refers to a pressure above atmospheric pressure.
Example 1
Fig. 1 is a schematic diagram of the structure and flow of a superheated steam-based material drying system according to embodiment 1 of the present invention. Referring to fig. 1, a superheated steam based material drying system comprises:
a material drying subsystem including a material drying chamber 100, a superheated steam circulating fan 110 and a superheated steam heater 120;
the material drying chamber 100 is provided with a material inlet 101 and a material outlet 102;
the material drying chamber 100 is also provided with a superheated steam inlet 103 and a superheated steam outlet 104;
the superheated steam outlet 104 is connected with the suction port of the superheated steam circulating fan 110 through a superheated steam circulating pipeline, the exhaust port of the superheated steam circulating fan 110 is connected with the inlet of the superheated steam heater 120 through a superheated steam circulating pipeline, and the outlet of the superheated steam heater 120 is connected with the superheated steam inlet 103 of the material drying chamber 100 through a superheated steam circulating pipeline; the exhaust port of the superheated steam circulating fan 110 is further connected with a secondary steam exhaust pipeline 111 for exhausting secondary steam evaporated from the material, and the secondary steam exhaust pipeline 111 is provided with a flow regulating valve 112 for ensuring that the circulating flow of the superheated steam is basically stable.
In addition, a throttle valve 105 or a back pressure valve 105 is further provided on the superheated steam circulation pipe connecting the superheated steam outlet 104 of the material drying chamber 100 and the suction port of the superheated steam circulation fan 110 for maintaining the pressure of the material drying chamber above atmospheric pressure so that the external air cannot enter the material drying chamber 100 through the material inlet 101 and the material outlet 102 of the material drying chamber 100.
A pressure sensor 106 is arranged on the upstream of the material drying chamber 100 or the throttling valve 105, and the throttling valve 105 or the backpressure valve 105 is adjusted to enable the pressure displayed by the pressure sensor 106 to be higher than the atmospheric pressure by 0.01-2 kPa.
The material flow direction in the material drying chamber 100 is opposite to the superheated steam flow direction, so as to enhance the heat exchange between the superheated steam and the material.
The superheated steam heater 120 is a gas hot-blast stove or an electric hot-blast stove. For places without natural gas supply or where natural gas is high in price and electricity is low in cost, the operation cost of material drying can be obviously reduced by adopting the electric hot air furnace.
By adopting the material drying system based on superheated steam, the embodiment provides a material drying method of the material drying system based on superheated steam, which comprises the following steps:
s1, placing a material in a material drying chamber 100;
the material drying chamber 100 may be implemented as a closed type or a non-closed type, for example, taking a closed type as an example, step S1 is specifically: the material is placed in the closed material drying chamber 100, that is, after the material is placed in the material drying chamber 100, the material inlet 101 and the material outlet 102 are sealed. Taking a non-closed type as an example, the material is continuously fed from the material inlet 101 and conveyed to the material outlet 102 and continuously discharged, and the material inlet 101 and the material outlet 102 are not subjected to a closed treatment.
S2, starting the superheated steam circulating fan 110 and the superheated steam heater 120 of the superheated steam, so that the superheated steam heater 120 generates the superheated steam and the superheated steam flows through the material;
in specific implementation, after the superheated steam circulation fan 110 is turned on, a circulation wind direction of the superheated steam circulation fan 110 may be opposite to a flow direction of the material, so that the superheated steam is opposite to the flow direction of the material.
And S3, discharging the secondary steam evaporated from the material from a secondary steam discharge pipeline 111.
In practice, particularly in the operation of discharging the secondary steam from the secondary steam discharge pipe 111, it can be realized by controlling a valve on the secondary steam discharge pipe 111, such as the flow regulating valve 112.
S4, enabling the material drying chamber to be in a micro-positive pressure state by adjusting the power of the superheated steam circulating fan, or/and a throttle valve or a back pressure valve, or/and a flow adjusting valve of secondary steam, and further enabling outside air not to enter the material drying chamber 100 through a material inlet and a material outlet of the material drying chamber 100;
specifically, a throttle valve 105 or a back pressure valve 105 is arranged on a superheated steam circulation pipeline connecting the superheated steam outlet 104 of the material drying chamber 100 and the suction port of the superheated steam circulation fan 110; the opening degree of the throttle valve 105 or the backpressure valve 105 is adjusted, so that the pressure in the material drying chamber 100 is greater than the pressure outside the material drying chamber. For example, the pressure in the material drying chamber 100 may be greater than the ambient pressure outside the material drying chamber 100 by 0.01 to 2kPa, so that the material drying chamber 100 is kept in a micro-positive pressure state.
Example 2
Fig. 2 is a schematic diagram of the structure and flow of the superheated steam-based material drying system according to embodiment 2 of the present invention. Referring to fig. 2, the present embodiment is different from embodiment 1 in that the present embodiment further includes:
a second type absorption heat pump subsystem, which comprises a generator 20, a condenser 21, an evaporator 11 and an absorber 10;
the generator 20 is provided with a generating heat exchanger 25, the condenser 21 is provided with a condensing heat exchanger 26, the evaporator 11 is provided with an evaporating heat exchanger 16, the absorber 10 is provided with an absorbing heat exchanger 15, the generator 20 and the condenser 21 are communicated through a first working medium steam passage 22, and the evaporator 11 and the absorber 10 are communicated through a second working medium steam passage 12.
Since the absorber 10 and the generator 20 have different working temperatures, the absorber needs a lower temperature, and the generator needs a higher temperature, in this embodiment, a solution circulation pipeline 31 is provided between the absorber 10 and the generator 20 for circulating the absorption solution between the absorber 10 and the generator 20, and a solution heat exchanger 36 is provided on the solution circulation pipeline 31 for exchanging heat between the low-temperature concentrated absorption solution output from the generator 20 and the high-temperature dilute absorption solution output from the absorber 10.
A condensing working medium circulating pipeline 32 is arranged between the evaporator 11 and the condenser 21 and is used for guiding the condensing working medium in the condenser 21 into the evaporator 11.
The evaporation heat source evaporates the working medium into working medium steam through the evaporation heat exchanger 16. The working medium vapor enters the absorber 10 through the second working medium vapor passage 12, and is absorbed by the high-concentration absorption solution in the absorber 10, and high-temperature absorption heat is released, and the absorption solution is diluted.
The generating heat source makes a part of working medium in the absorption solution evaporated into working medium steam through the generating heat exchanger 25, so that the absorption solution in the generator is concentrated. The working medium steam enters the condenser 21 through the first working medium steam channel 22, then is condensed into a condensed working medium by cooling water, and the condensed working medium is conveyed to the evaporator 11 through a condensed working medium circulating pump 37 on the condensed working medium circulating pipeline.
The secondary steam discharge pipeline 111 is respectively connected with an inlet of the generation heat exchanger 25 and an inlet of the evaporation heat exchanger 16, and is used for guiding secondary steam evaporated from a material into the generation heat exchanger 25 and the evaporation heat exchanger 16 respectively as a generation heat source and an evaporation heat source of the second-type absorption heat pump subsystem.
The secondary steam discharge line 111 is connected to the secondary steam line 46 of the generating heat exchanger 25 and the secondary steam line 44 of the evaporating heat exchanger 16. The generation heat exchanger 25 is provided with a generation heat exchanger outlet 47, the evaporation heat exchanger 16 is provided with an evaporation heat exchanger outlet 45, the condensation heat exchanger 26 is provided with a cooling water inlet 27 and a cooling water outlet 28, and the absorption heat exchanger 15 is provided with an absorption heat exchanger inlet 17 and an absorption heat exchanger outlet 18. A condensing working medium circulating pump 37 is arranged on the condensing working medium circulating pipeline 32; a throttle valve 35 is arranged on the solution circulating pipeline 31. An evaporator spraying device 14 is arranged at the upper part in the evaporation heat exchanger 16.
The evaporator 11 is further provided with an evaporator spray pipeline for conveying the liquid working medium at the bottom of the evaporator 11 to the top, so that the condensed working medium in the evaporator 11 is circulated, and the heat exchange efficiency is improved. In addition, a working medium spray pump 33 and a solution circulating pump 34 are respectively arranged on the evaporator spray pipeline and the solution circulating pipeline 31. The working medium spraying pump 33 guides the condensed working medium in the evaporator 11 into the evaporator spraying device 14 through a working medium spraying pipeline, and the evaporator spraying device 14 sprays the condensed working medium in the evaporator 11. A solution circulation line 31 leads absorption solution from the generator 20 to the absorber 10. The generator 20 is connected to an absorber spray 13 in the absorber 10 by a solution circulation pipe 31. The absorber 10 is connected to the generator spray 23 in the generator 20 by a solution circulation pipe 31.
With the material drying system based on superheated steam, this embodiment further provides a material drying method of the material drying system based on superheated steam, which is different from embodiment 1 in that the material drying method of this embodiment further includes, after step S4:
s5, heating the absorption solution in the generator 20 by using a part of secondary steam provided by the secondary steam discharge pipeline 111 to generate working medium steam and simultaneously concentrate the absorption solution, introducing the generated working medium steam into the condenser 21, and outputting the concentrated absorption solution to the absorber 10 through the solution circulating pipeline 31;
s6, condensing the working medium steam generated by the generator 20 in a condenser 21, and conveying the condensed working medium to the evaporator 11;
s7, heating the condensed working medium in the evaporator 11 by using the other part of secondary steam provided by the secondary steam discharge pipeline 111 to evaporate the condensed working medium into working medium steam, and introducing the generated working medium steam into the absorber 10;
s8, absorbing the working medium steam from the evaporator 11 by the absorbing solution in the absorber 10 to generate absorption heat, diluting the absorbing solution, and conveying the diluted absorbing solution to the generator 20 through a solution circulating pipeline 31 arranged between the absorber 10 and the generator 20;
s9, condensing a part of secondary steam in the generating heat exchanger 25 to form condensed water, and outputting the condensed water outwards through an outlet 47 of the generating heat exchanger; another part of the secondary steam condenses in the evaporator heat exchanger 16 to form condensate which is output via the evaporator heat exchanger outlet 45.
Preferably, the absorption solution output from the generator 20 is heat exchanged with the absorption solution output from the absorber 10 by a solution heat exchanger 36.
Therefore, most of the secondary steam evaporated from the drying chamber is collected under the condition that almost no air is mixed, so that the obvious reduction of the saturation temperature is avoided, and the latent heat of the secondary steam can be fully utilized by the second-type absorption heat pump at a higher temperature grade. In addition, because the secondary steam that comes out from the material evaporation has obtained condensation and recovery in second type absorption heat pump, therefore the utility model discloses still have the effect of water conservation and emission reduction.
Example 3
Fig. 3 is a schematic diagram of the structure and process flow of the superheated steam-based material drying system according to embodiment 3 of the present invention. Referring to fig. 3, the present embodiment is different from embodiment 2 in that the present embodiment further includes:
a superheated steam circulation pipeline of an exhaust port of the superheated steam circulation fan 110 is connected with an inlet of the absorption heat exchanger 15, an outlet of the absorption heat exchanger 15 is connected with an inlet of the superheated steam heater 120 through a superheated steam pipeline, and high-temperature heat generated by the absorber 10 is used for preheating superheated steam.
With the material drying system based on superheated steam, this embodiment further provides a material drying method of the material drying system based on superheated steam, which is different from embodiment 2 in that the material drying method of this embodiment further includes, after step S4 and before step S5:
the superheated steam output from the superheated steam circulation pipeline at the exhaust port of the superheated steam circulation fan 110 is introduced into the absorption heat exchanger 15, and the steam after heat exchange in the absorption heat exchanger 15 is delivered to the superheated steam heater 120, so that the high-temperature heat generated by the absorber 10 is used for preheating the superheated steam.
Example 4
Fig. 4 is a schematic diagram of the structure and process flow of the superheated steam-based material drying system according to embodiment 4 of the present invention. As shown in fig. 4, the present embodiment is different from embodiment 2 in that the present embodiment further includes:
a superheated steam preheater 130 is further disposed on a superheated steam pipeline connecting the exhaust port of the superheated steam circulation fan 110 and the superheated steam heater 120, a hot-side fluid inlet of the superheated steam preheater 130 is connected to the outlet of the absorption heat exchanger 15 through a saturated steam pipeline, and the saturated steam generated in the absorption heat exchanger 15 is introduced to a heat fluid side of the superheated steam preheater 130 as a preheating heat source of the superheated steam;
a drain valve 132 is arranged on a condensed water discharge pipe 131 of the superheated steam preheater 130.
With the material drying system based on superheated steam, this embodiment further provides a material drying method of the material drying system based on superheated steam, which is different from embodiment 2 in that the material drying method of this embodiment further includes, after step S4 and before step S5:
the condensed water is introduced into the absorption heat exchanger 15, and then the saturated steam generated in the absorption heat exchanger 15 is introduced into the heat fluid side of the superheated steam preheater 130 as a preheating heat source of the superheated steam.
Example 5
Fig. 5 is a schematic diagram of the structure and process flow of the superheated steam-based material drying system according to embodiment 5 of the present invention. Referring to fig. 5, the difference between the present embodiment and embodiment 3 is that the heat pump subsystem adopted in the present embodiment is an absorption/compression composite high-temperature heat pump subsystem, and the high-temperature heat pump subsystem includes a second-type absorption heat pump subsystem and a vapor compression heat pump subsystem;
the second absorption heat pump subsystem comprises a generator 50, a condenser 21, an evaporator 11 and an absorber 10; the evaporator 11 and the absorber 10 are the same as the evaporator 11 and the absorber 10 in embodiment 3, and therefore the detailed structure and connection relationship thereof are not described herein again.
The condenser 21 comprises a condensing heat exchanger 26 and a condensing medium receiver 24, and the condensing medium receiver 24 is connected with the evaporator 11.
The generator 50 comprises an absorption solution flash chamber 51, a generator spray device 53, a solution spray pipeline 55, a solution spray pump 54 and an external generation heat exchanger 52, the external generation heat exchanger 52 is arranged outside the absorption solution flash chamber 51, the generator spray device 53 is arranged on the upper part inside the absorption solution flash chamber 51, the generator spray device 53 is connected with the solution spray pipeline 55 arranged outside the absorption solution flash chamber 51, the absorption solution spray pump 54 is arranged on the solution spray pipeline 55, the solution spray pipeline 55 conveys the absorption solution in the absorption solution flash chamber 51 to the generator spray device 53 for spraying, and the solution spray pipeline 55 is connected with the cold fluid side of the generation heat exchanger 25. The upper part of the generator spraying device 53 is provided with a condensed working medium receiver 24.
The vapor compression type heat pump subsystem comprises a compressor 60, a throttle valve 63 and a refrigerant circulating pipeline 64, wherein the vapor compression type heat pump subsystem takes the condensing heat exchanger 26 as a compression evaporator thereof, takes the external generation heat exchanger 52 as a compression condenser thereof, the refrigerant circulating pipeline 64 on the exhaust port side of the compressor 60 is connected with the heat fluid side of the external generation heat exchanger 52, the refrigerant circulating pipeline 64 on the downstream of the throttle valve 63 is connected with the inlet of the condensing heat exchanger 26, and the outlet of the condensing heat exchanger 26 is connected with the refrigerant circulating pipeline on the suction port side of the compressor 60; preferably, a temperature sensor 65 is arranged on a refrigerant circulating pipeline at the outlet of the condensing heat exchanger and used for adjusting the superheat degree of the refrigerant; a subcooler 62 is provided in the refrigerant circulation line downstream of the external heat generating exchanger 52 for improving the coefficient of refrigeration performance. The cold fluid side of the subcooler 62 is provided with a cooling water inlet 27 and a cooling water outlet 28.
By adopting the material drying system based on superheated steam, the embodiment also provides a material drying method of the material drying system based on superheated steam, which is the same as the material drying method described in embodiment 3.
Example 6
Fig. 6 is a schematic diagram of the structure and process flow of the superheated steam-based material drying system according to embodiment 6 of the present invention. Referring to fig. 6, the difference between the present embodiment and embodiment 4 is that the heat pump subsystem adopted in the present embodiment is an absorption/compression composite high-temperature heat pump subsystem, and the high-temperature heat pump subsystem includes a second-type absorption heat pump subsystem and a vapor compression heat pump subsystem;
the second absorption heat pump subsystem comprises a generator 20, a condenser 21, an evaporator 11 and an absorber 10; the evaporator 11 and the absorber 10 are the same as the evaporator 11 and the absorber 10 in embodiment 3, and therefore the detailed structure and connection relationship thereof are not described herein again.
The generator 50 and the condenser 21 are the same as the generator 50 and the condenser 21 of embodiment 5, and therefore the detailed structure and connection relationship thereof are not described herein again.
The vapor compression heat pump subsystem is the same as the vapor compression heat pump subsystem of embodiment 5, and therefore the detailed structure and connection relationship thereof are not described herein again.
By adopting the material drying system based on superheated steam, the embodiment also provides a material drying method of the material drying system based on superheated steam, which is the same as the material drying method of the embodiment 4.
The absorbent of the above embodiments of the present invention is selected from the group consisting of LiBr, LiNO3LiCl or CaCl2At least one of the working substances can adopt H2O。
In the above embodiments, only the basic flow for implementing the technical solution of the present invention is described, and other parts or devices for implementing the flow are omitted, for example, a pump or a valve required for ensuring the flowing direction of each substance, a working medium for absorbing the solution, and an absorbent. For other devices or parts required for implementing the power cycle system described in the above embodiments, those skilled in the art can find corresponding technical means in the prior art, and details are not described herein.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A material drying system based on superheated steam comprises a material drying subsystem, wherein the material drying subsystem comprises a material drying chamber, the material drying chamber is provided with a material inlet and a material outlet, and the material drying subsystem is characterized by further comprising a superheated steam circulating fan and a superheated steam heater, the material drying chamber is further provided with a superheated steam inlet and a superheated steam outlet, the superheated steam outlet is connected with an air suction port of the superheated steam circulating fan through a superheated steam circulating pipeline, an air exhaust port of the superheated steam circulating fan is connected with an inlet of the superheated steam heater through the superheated steam circulating pipeline, and an outlet of the superheated steam heater is connected with the superheated steam inlet of the material drying chamber through the superheated steam circulating pipeline; the exhaust port of the superheated steam circulating fan is also connected with a secondary steam discharge pipeline for discharging secondary steam evaporated from the material.
2. The superheated steam-based material drying system of claim 1, wherein the secondary steam discharge line is provided with a flow regulating valve.
3. The superheated steam-based material drying system as claimed in claim 2, wherein a throttle valve or a back pressure valve is provided on the superheated steam circulation pipe connecting the superheated steam outlet of the material drying chamber and the suction port of the superheated steam circulation fan for maintaining the pressure of the material drying chamber in a micro-positive pressure state.
4. The superheated steam-based material drying system as claimed in claim 3, wherein a pressure sensor is arranged upstream of the material drying chamber or the throttle valve, and the pressure displayed by the pressure sensor is 0.01-2 kPa higher than the atmospheric pressure by adjusting the power of the superheated steam circulating fan, or/and the throttle valve or the back pressure valve, or/and the flow regulating valve of the secondary steam, so that the external air cannot enter the material drying chamber through the material inlet and the material outlet of the material drying chamber.
5. The superheated steam-based material drying system of claim 4, further comprising a second-type absorption heat pump subsystem, wherein the second-type absorption heat pump subsystem comprises a generator, a condenser, an evaporator and an absorber, the generator is provided with a generating heat exchanger, the condenser is provided with a condensing heat exchanger, the evaporator is provided with an evaporating heat exchanger, the absorber is provided with an absorbing heat exchanger, the generator and the condenser are communicated through a first working medium vapor passage, the evaporator and the absorber are communicated through a second working medium vapor passage, an absorbing solution circulating pipeline is arranged between the absorber and the generator and used for circulating absorbing solution between the absorber and the generator, the absorbing solution circulating pipeline is provided with a solution heat exchanger and used for exchanging heat between low-temperature concentrated absorbing solution output by the generator and high-temperature dilute absorbing solution output by the absorber, and a condensation working medium circulation pipeline is arranged between the evaporator and the condenser and used for guiding the condensation working medium in the condenser into the evaporator, and a secondary steam discharge pipeline is connected with inlets of the generation heat exchanger and the evaporation heat exchanger and used for guiding secondary steam evaporated from materials into the generation heat exchanger and the evaporation heat exchanger as a generation heat source and an evaporation heat source of the second-type absorption heat pump subsystem.
6. The superheated steam-based material drying system of claim 5, further comprising an absorption/compression composite type high temperature heat pump subsystem, wherein the high temperature heat pump subsystem comprises a second type absorption heat pump subsystem and a vapor compression heat pump subsystem, the second type absorption heat pump subsystem comprises a generator, a condenser, an evaporator and an absorber, the condenser is provided with a condensing heat exchanger, the evaporator is provided with an evaporating heat exchanger, the absorber is provided with an absorbing heat exchanger, the generator and the condenser are communicated through a first working medium vapor passage, the evaporator and the absorber are communicated through a second working medium vapor passage, an absorbing solution circulating pipeline is arranged between the absorber and the generator for circulating absorbing solution between the absorber and the generator, the absorbing solution circulating pipeline is provided with a solution heat exchanger, the low-temperature concentrated absorption solution is used for exchanging heat with the high-temperature dilute absorption solution output by the absorber, and a condensing working medium pipeline is arranged between the evaporator and the condenser and is used for guiding the condensing working medium in the condenser into the evaporator;
the generator comprises an absorption solution flash evaporation chamber, a generator spraying device, a solution spraying pipeline, a solution spraying pump and an external generation heat exchanger, wherein the external generation heat exchanger is arranged outside the absorption solution flash evaporation chamber;
the vapor compression type heat pump subsystem comprises a compressor, a throttle valve and a refrigerant circulating pipeline, wherein the vapor compression type heat pump subsystem takes the condensing heat exchanger as a compression evaporator thereof and takes the external generating heat exchanger as a compression condenser thereof, the refrigerant circulating pipeline on the exhaust port side of the compressor is connected with the heat fluid side of the external generating heat exchanger, the refrigerant circulating pipeline on the downstream of the throttle valve is connected with the inlet of the condensing heat exchanger, and the outlet of the condensing heat exchanger is connected with the refrigerant circulating pipeline on the suction port side of the compressor;
and the secondary steam discharge pipeline is connected with an inlet of the evaporation heat exchanger and is used for guiding secondary steam evaporated from a material into the evaporation heat exchanger as an evaporation heat source of the absorption heat pump subsystem.
7. The superheated steam-based material drying system of claim 6, wherein a superheated steam circulation pipeline of the exhaust port of the superheated steam circulation fan is connected with an inlet of the absorption heat exchanger, an outlet of the absorption heat exchanger is connected with an inlet of the superheated steam heater through a superheated steam pipeline, and high-temperature heat generated by the absorber is used for preheating the superheated steam.
8. The superheated steam-based material drying system according to claim 7, wherein a superheated steam preheater is further provided on a superheated steam pipe connecting the exhaust port of the superheated steam circulation fan and the superheated steam heater, a hot-side fluid inlet of the superheated steam preheater is connected to the outlet of the absorption heat exchanger through a saturated steam pipe, and the saturated steam generated in the absorption heat exchanger is introduced to a hot fluid side of the superheated steam preheater as a preheating heat source of the superheated steam.
9. The superheated steam-based material drying system of any one of claims 1 to 8, wherein the material flow direction in the material drying chamber is opposite to the superheated steam flow direction.
10. The superheated steam-based material drying system of any one of claims 1 to 8, wherein the superheated steam heater is a gas hot blast stove or an electric hot blast stove.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110260636A (en) * | 2019-06-14 | 2019-09-20 | 北京联力源科技有限公司 | A kind of material drying system and method based on superheated steam |
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