CN110553477A - Drying box and heat flow circulation control method - Google Patents
Drying box and heat flow circulation control method Download PDFInfo
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- CN110553477A CN110553477A CN201910924929.6A CN201910924929A CN110553477A CN 110553477 A CN110553477 A CN 110553477A CN 201910924929 A CN201910924929 A CN 201910924929A CN 110553477 A CN110553477 A CN 110553477A
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- 238000001035 drying Methods 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 118
- 238000004891 communication Methods 0.000 claims abstract description 16
- 238000005192 partition Methods 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 66
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 56
- 239000000523 sample Substances 0.000 claims description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 37
- 238000007664 blowing Methods 0.000 claims description 19
- 229910052757 nitrogen Inorganic materials 0.000 claims description 19
- 238000001514 detection method Methods 0.000 claims description 18
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 18
- 230000007246 mechanism Effects 0.000 claims description 13
- 230000009471 action Effects 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 3
- 230000008602 contraction Effects 0.000 claims 1
- 238000002347 injection Methods 0.000 abstract description 4
- 239000007924 injection Substances 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 abstract description 3
- 239000003245 coal Substances 0.000 description 14
- 230000000694 effects Effects 0.000 description 9
- 238000009423 ventilation Methods 0.000 description 7
- 239000002585 base Substances 0.000 description 4
- 238000009529 body temperature measurement Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 238000010981 drying operation Methods 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 2
- 239000003830 anthracite Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 239000002802 bituminous coal Substances 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000007605 air drying Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000002274 desiccant Substances 0.000 description 1
- -1 for example Substances 0.000 description 1
- 239000012458 free base Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000003077 lignite Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
- F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/06—Chambers, containers, or receptacles
- F26B25/08—Parts thereof
- F26B25/12—Walls or sides; Doors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/06—Chambers, containers, or receptacles
- F26B25/14—Chambers, containers, receptacles of simple construction
- F26B25/16—Chambers, containers, receptacles of simple construction mainly closed, e.g. drum
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
- F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses a drying oven and a heat flow circulation control method, belongs to the technical field of sample total moisture measurement, solves the problem of low drying efficiency of the existing drying oven, and adopts the following technical scheme: the device comprises a box body and a cavity formed by enclosing the box body, wherein a partition board is arranged in the cavity and used for dividing the cavity into a first cavity and a second cavity which are arranged up and down; a sample injection door is arranged at one end of the first cavity, a heating cavity is arranged at one end of the box body opposite to the sample injection door, an exhaust port is arranged at a position, close to the second cavity, on the heating cavity, and a switching door for switching between a first position and a second position is arranged at the exhaust port of the heating cavity; when the switching door is located at the first position, the exhaust port is blocked by the switching door, and the heating cavity is communicated with the second cavity so as to carry out an internal circulation mode; when the switching door is located at the second position, the communication position of the heating cavity and the second cavity is blocked by the switching door, and the air outlet is opened to carry out an external circulation mode. The technical scheme has the advantages of high drying efficiency, strong applicability and the like.
Description
Technical Field
The invention mainly relates to the technical field of sample drying, in particular to a drying box and a heat flow circulation control method.
Background
The coal sample mainly comprises organic matters and inorganic matters, and the inorganic matter moisture of the coal is the most easily changed component in each link. For a coal yard of a power plant, the moisture content in coal is the most basic index for evaluating the economic and use values of coal, the moisture content in coal directly influences the content of other components in coal or the content of calorific value, and simultaneously, the measurement, acceptance and management of coal are also influenced in a relevant way. Therefore, the determination of the moisture content in the coal is a critical link, and a drying oven for performing the moisture determination of the coal sample is an important component.
traditional laboratory drying device adopts electric heat constant temperature air-blast drying cabinet mainly, and electric heat constant temperature air-blast drying cabinet needs artifical manual title appearance and record data at every turn, and degree of automation is low, needs someone on duty, and efficiency is not high. Meanwhile, the traditional drying box is large in size, and the consumption of nitrogen is large under the condition that the sample is dried by introducing nitrogen. Meanwhile, the traditional drying box has the defects that the temperature field difference in the cavity cannot meet the national standard requirement due to uneven circulating airflow, and meanwhile, the heat flow circulating speed of the traditional drying box is low, so that the gas exchange speed is low, water vapor in the cavity is difficult to remove, and the drying efficiency is low. Meanwhile, the air outlet of the traditional drying oven heating air blowing assembly is smaller than the size of the cavity, so that air exchange dead angles exist in the cavity, and residual oxygen exists in the cavity during nitrogen ventilation drying, so that the national standard requirement is not met.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the technical problems in the prior art, the invention provides the drying box with simple structure and high drying efficiency and the heat flow circulation control method.
in order to solve the technical problems, the technical scheme provided by the invention is as follows:
A drying box comprises a box body and a cavity formed by enclosing the box body, wherein a partition plate is arranged in the cavity and used for dividing the cavity into a first cavity and a second cavity which are arranged up and down; a sample introduction door is arranged at one end of the first cavity, a heating cavity is arranged at one end of the box body opposite to the sample introduction door, the heating cavity is respectively communicated with the first cavity and the second cavity, a blast heating assembly is arranged in the heating cavity, an air return hole for communicating the first cavity with the second cavity is formed in one side, close to the sample introduction door, of the partition plate, and the first cavity, the heating cavity, the second cavity and the air return hole are sequentially communicated to form a circulating air duct; an air inlet assembly is arranged in the first chamber; an air outlet is formed in the heating cavity at a position close to the second cavity, and a switching door for switching between a first position and a second position is arranged at the air outlet of the heating cavity; when the switching door is located at the first position, the air outlet is blocked by the switching door, and the heating cavity is communicated with the second cavity so as to carry out an internal circulation mode; when the switching door is located at the second position, the communication position of the heating cavity and the second cavity is blocked by the switching door, and the air outlet is opened to carry out an external circulation mode.
As a further improvement of the above technical solution:
The blowing and heating assembly comprises a blowing assembly and a heating assembly, the blowing assembly comprises a cross flow fan, and the arrangement direction of the cross flow fan is consistent with the width direction of the first chamber or the second chamber and is used for blowing uniform parallel wind into the first chamber or the second chamber.
The width of the air outlet of the crossflow fan is the same as that of the first chamber or the second chamber.
The heating assembly is located at the communication position of the heating cavity and the second chamber and used for heating gas.
The heating assembly is a PTC heating sheet and is matched with the shape of the communication part.
the air blowing assembly and the heating assembly are both positioned on a mounting plate.
A temperature detection piece is arranged in the first cavity and used for detecting the temperature of the gas in the first cavity; the heating assembly is connected with the temperature detection piece and used for receiving the detected gas temperature value and heating and adjusting the gas temperature value so as to maintain the gas temperature in the first cavity within a constant range; or a temperature detection piece is arranged in the second chamber and used for detecting the temperature of the gas in the second chamber; the heating assembly is connected with the temperature detection piece and used for receiving the detected gas temperature value and heating and adjusting the gas temperature value so as to maintain the gas temperature in the second chamber within a constant range.
the temperature detection piece comprises a fixed seat and a temperature measurement probe, the fixed seat is detachably connected to the box body, and the temperature measurement probe is installed in the fixed seat.
The switching door comprises a door body and a driving mechanism, wherein two sides of the door body are rotatably installed on the heating cavity, and the driving mechanism is rotatably connected with the door body and used for driving the door body to rotate between a first position and a second position.
The driving mechanism comprises an extensible member and a rotating plate, one side of the rotating plate is fixedly connected with the rotating end of the door body, the other side of the rotating plate is rotatably connected with the extensible end of the extensible member, and the extensible member stretches and retracts to drive the rotating plate to rotate, so that the door body rotates between a first position and a second position.
The telescopic part comprises a telescopic cylinder.
The gas inlet assembly comprises a nitrogen gas inlet unit, an air inlet unit and a strip-shaped gas distributor, and the gas distributor is arranged in a first cavity close to the heating cavity; the nitrogen gas inlet unit and the air gas inlet unit are respectively connected with the gas distributor and are interlocked.
The nitrogen gas inlet unit comprises a nitrogen gas source, a pressure reducing valve, a nitrogen gas electric control switch and a drying module which are sequentially connected, and the drying module is connected with one end of the gas distributor; the air inlet unit comprises an air electric control switch, and the air electric control switch is connected with the other end of the air distributor or is connected with one end of the air distributor through a three-way valve; the nitrogen electric control switch and the air electric control switch are electrically or mechanically interlocked.
The sampling door comprises a door plate, wherein the upper end of the door plate is arranged on the box body through a hinge piece, so that the door plate is turned over and opened in the box body under the pushing of external force or falls back and is closed under the action of gravity.
The invention also discloses a heat flow circulation control method based on the drying box, which comprises the following steps:
S01, detecting the concentration of the water vapor in the first chamber;
S02, when the detected water vapor concentration does not reach the preset water vapor concentration, controlling the switching door to switch to the first position, blocking the exhaust port, and communicating the heating cavity with the second cavity so as to dry the sample in an internal circulation mode; when the detected water vapor concentration reaches the preset water vapor concentration, the switching door is controlled to be switched to the second position, the communication position of the heating cavity and the second cavity is blocked, and the exhaust port is opened to enter an external circulation mode to exhaust water vapor.
As a further improvement of the above technical solution:
In step S01, the water vapor concentration of the first chamber is obtained by the water vapor concentration detection member or by the opening time according to the internal circulation mode.
In step S02, after the external circulation mode is entered, the mode is switched to the internal circulation mode after a predetermined time has elapsed.
Compared with the prior art, the invention has the advantages that:
According to the drying box, the air is circularly heated through the air blowing heating assembly, so that the heating effect is good; the circulating air duct formed by sequentially communicating the first cavity, the heating cavity, the second cavity and the air return hole is simple, compact and ingenious in structure, short in gas circulation period and good in drying effect.
According to the drying box, the shape of the cross flow fan is matched with that of the heating cavity, namely the cross section shapes of the first cavity and the second cavity, so that the flow velocity of gas in the circulating air duct can be accelerated, the ventilation of the gas is accelerated and the drying efficiency is improved compared with a common fan; the arrangement direction of the cross flow fan is consistent with the width direction of the first cavity or the second cavity, and the cross flow fan is used for blowing uniform parallel wind into the first cavity or the second cavity; the width of the air outlet of the cross flow fan is the same as that of the first cavity or the second cavity, and the air can be blown to the full section of the first cavity or the second cavity, so that dead angles inside the cavity are eliminated, and the problem of air residue in the cavity during nitrogen ventilation and drying is avoided. According to the drying box, the temperature detection piece is arranged in the box body and used for detecting the temperature of the gas in the second cavity so as to heat and regulate the heating assembly, so that the temperature of the gas in the first cavity is maintained in a constant range.
According to the heat flow circulation control method, the evaporation of water inside and outside the sample is accelerated to form water vapor through the internal circulation mode, the consumption of nitrogen in the cavity is greatly reduced, meanwhile, the power of the heating sheet can be greatly reduced through the internal circulation mode, and the purpose of energy conservation can be achieved; when the concentration of the water vapor in the first cavity reaches or approaches to the saturated vapor pressure, the switching from the internal circulation mode to the external circulation mode is realized through the switching of the switching door, the discharge of the water vapor is accelerated through the exhaust port, and the drying efficiency of a subsequent sample is further improved; through the matching of the internal and external circulation modes, the sample is quickly dried.
Drawings
Fig. 1 is a perspective view of one embodiment of the present invention.
Fig. 2 is a second perspective view of the present invention.
Fig. 3 is a third perspective view of the present invention.
Fig. 4 is a perspective view of the case according to the embodiment of the present invention.
Fig. 5 is a perspective view of a heating chamber according to an embodiment of the present invention.
fig. 6 is a second perspective view of the heating chamber according to the embodiment of the present invention.
Fig. 7 is a cross-sectional view of a heating chamber in accordance with an embodiment of the present invention.
Fig. 8 is a perspective view of the temperature detector according to the embodiment of the present invention.
Fig. 9 is a perspective view of an air intake assembly according to an embodiment of the present invention.
The reference numbers in the figures denote: 1. a box body; 101. a partition plate; 1011. air return holes; 102. a ventilation plate; 1021. a first communication hole; 1022. a second communication hole; 103. a left side plate; 104. an upper flange plate; 105. a right side plate; 107. a base plate; 108. a front panel; 109. a heat insulation layer; 110. a top cover plate; 112. a first chamber; 113. a second chamber; 2. a heating cavity; 201. mounting a plate; 202. closing the plate; 203. an air inlet; 204. an air outlet; 3. a blower heating assembly; 301. a blower assembly; 3011. a cross flow fan; 302. a heating assembly; 3021. a heating plate; 3022. a temperature relay; 4. a temperature detection member; 401. a temperature measuring probe; 402. a fixed seat; 5. an air intake assembly; 501. a gas distributor; 502. a nitrogen gas inlet unit; 5021. a nitrogen source; 5022. a pressure reducing valve; 5023. a nitrogen electric control switch; 5024. a drying module; 503. an air intake unit; 5031. an air electric control switch; 6. a sample introduction door; 601. a door panel; 602. an articulation member; 6021. a rotating shaft; 6022. a rotating shaft sleeve; 7. a baffle; 8. a switching gate; 801. a door body; 802. a drive mechanism; 8021. a telescoping member; 8022. a rotating plate; 8023. a joint; 9. and (7) an exhaust port.
Detailed Description
The invention is further described below with reference to the figures and the specific embodiments of the description.
As shown in fig. 1 to 9, the drying oven of the present embodiment is used for drying operation in moisture determination of a sample (such as a coal sample), and includes an oven body 1 and a chamber enclosed by the oven body 1, wherein a partition board 101 is disposed in the chamber and is used for dividing the chamber into a first chamber 112 and a second chamber 113 which are disposed up and down; the first chamber 112 is used for drying a sample (namely, a drying chamber, a sample tray for placing a sample with a corresponding particle size), one end of the first chamber 112 is provided with a sample introduction door 6, one end of the box body 1 opposite to the sample introduction door 6 is provided with a heating cavity 2, the heating cavity 2 is respectively communicated with the first chamber 112 and the second chamber 113, specifically, the first chamber 112 is provided with a first communicating hole 1021, the second chamber 113 is provided with a second communicating hole 1022, the heating cavity 2 is provided with an air inlet 203 and an air outlet 204, the second communicating hole 1022 is communicated with the air outlet 204, and the first communicating hole 1021 is communicated with the air inlet 203; a blowing heating assembly 3 is arranged in the heating cavity 2, an air return hole 1011 for communicating the first cavity 112 with the second cavity 113 is arranged on one side of the partition plate 101 close to the sample introduction door 6, an air inlet assembly 5 is arranged on the first cavity 113 close to the first communicating hole 1021, and the first cavity 112, the heating cavity 2, the second cavity 112 and the air return hole 1011 are sequentially communicated to form an internal circulation air duct; an exhaust port 9 is arranged on the heating cavity 2 at a position close to the second communication hole 1022 of the second chamber 113, and the heating cavity 2 is provided with a switching door 8 which is switched between a first position and a second position at the exhaust port 9; when the switching door 8 is located at the first position, the exhaust port 9 is blocked by the switching door 8 and the heating cavity 2 is communicated with the second cavity 113 to perform an internal circulation mode, that is, gas circulates in the circulation air duct; when the switch door 8 is located at the second position, the communication between the heating chamber 2 and the second cavity 113 is blocked by the switch door 8 and the exhaust port 9 is opened to perform an external circulation mode, i.e. the gas or water vapor in the first chamber 112 is exhausted through the exhaust port 9.
According to the drying box, the air internal circulation speed in the circulating air duct can be increased through the air blowing effect of the air blowing heating assembly 3, the circulation period is short, and therefore the drying effect is improved; furthermore, the air is circularly heated by matching with the blast heating component 3, so that the temperature rise of the air is accelerated, the temperature rise time is reduced, the evaporation of water inside and outside the sample is accelerated to form vapor, the consumption of nitrogen in the cavity is greatly reduced, and meanwhile, the heating power can be greatly reduced by an internal circulation mode, and the purpose of saving energy can be achieved; when the concentration of the water vapor in the cavity reaches or is close to the saturated vapor pressure, the switching from the internal circulation mode to the external circulation mode is realized by switching the switching door 8 between the first position and the second position, so that the utilization rate of nitrogen can be greatly improved, the consumption of the nitrogen is reduced when the sample is subjected to nitrogen introduction drying, and meanwhile, the gas with saturated or close to saturated water vapor in the cavity is accelerated to be discharged through the exhaust port 9, so that the drying efficiency of the subsequent sample is further improved; in addition, the structure of the switching door 8 is simple and ingenious, and the switching is simple, quick, convenient and effective.
As shown in fig. 5, the heating cavity 2 is enclosed by a fan sealing plate 202 and a fan mounting plate 201; the blowing heating assembly 3 provides power for the circulation of gas in the circulating air duct and heats the gas, and the blowing heating assembly comprises a blowing assembly 301, a heating assembly 302 and a temperature relay 3022. The blower assembly 301 comprises a high-temperature resistant cross flow fan 3011 and provides power for internal circulation of gas in the circulating air duct, and the rotating speed of the cross flow fan 3011 can be adjusted by a stepless speed regulator connected with a motor of the cross flow fan 3011, so that the circulating speed and the air volume of the gas in the circulating air duct can be controlled in the most reasonable range, the drying efficiency can be guaranteed, and a sample can be prevented from being taken away by air flow. Through crossflow fan 3011 and the following settings, the following technical effects are achieved:
1. Because the shape of the cross flow fan 3011 is matched with the shape of the heating cavity 2, namely matched with the cross section shapes of the first cavity 112 and the second cavity 113, compared with a common fan, the cross flow fan can accelerate the gas flow rate in the circulating air duct, accelerate the air exchange of the gas and improve the drying efficiency;
2. The arrangement direction of the cross flow fan 3011 is consistent with the width direction of the first cavity 112 or the second cavity 113, and is used for blowing uniform parallel wind into the first cavity 112 or the second cavity 113, and because the wind blown out by the cross flow fan 3011 is a wind current parallel to the first cavity 112 or the second cavity 113, the stability of a thermal field in the first cavity 112 can be better ensured, and the national standard requirements are met;
3. The width of the air outlet of the cross flow fan 3011 is the same as that of the first chamber 112 or the second chamber 113, and the air can be blown to the full section of the first chamber 112 or the second chamber 113, so that dead angles in the chambers are eliminated, and the problem of air residue in the chambers during nitrogen introduction and drying is avoided.
The heating assembly 302 is a PCT heating sheet 3021(PTC is a short for Positive Temperature Coefficient), and is fixed to the air outlet 204 of the cross flow fan 3011, and the shape of the heating sheet 3021 matches with the shape of the second communication hole 1022 (i.e., the air outlet 204 of the heating chamber 2), so as to heat the full cross section of the gas at the air outlet 204 of the heating chamber 2 and send the parallel air flow to the second chamber 113, thereby quickly raising the Temperature in the drying chamber, saving the time required for heating the drying chamber to the drying Temperature, improving the drying efficiency, and simultaneously ensuring the Temperature of the drying chamber within a reasonable range by the parallel air flow, and the structure is simpler and more reliable, in addition, the heating sheet 3021 is installed at the communication position between the heating chamber 2 and the second chamber 113, so as to reduce the depth of the first chamber 112, further reduce the volume of the box body 1, and achieve a better gas mixing effect. Crossflow blower 3011 and heating element 302 are both mounted on mounting plate 201 to form an integral module, which can be separated from box 1 for easy assembly, disassembly and maintenance. In addition, in other embodiments, other forms of heat patch 3021 are also used, as the case may be.
In this embodiment, the switching door 8 includes a door body 801 and a driving mechanism 802, one side of the door body 801 is rotatably installed on the heating chamber 2, and the driving mechanism 802 is connected to the door body 801 and is configured to drive the door body 801 to rotate between the first position and the second position. The driving mechanism 802 includes a telescopic member 8021 (e.g., a telescopic cylinder), a joint 8023 and a rotating plate 8022, one side of the rotating plate 8022 is fixedly connected with a rotating end of the door body 801 (e.g., the door body 801 is installed on the heating chamber 2 through a rotating shaft, and one side of the rotating plate 8022 is fixedly connected with the rotating shaft), the other side of the rotating plate 8022 is rotatably connected with a telescopic end of the telescopic member 8021 through the joint 8023, and the telescopic member 8021 performs telescopic motion to drive the rotating plate 8022 to rotate, so that the door body 801 rotates between the first position and the second position; the driving mechanism 802 may be a rotary cylinder, a rotary motor, a gear mechanism or a ratchet mechanism, and has a simple structure, simple and reliable operation, and easy implementation. Of course, in other embodiments, the telescoping member 8021 may also employ other components such as a telescoping cylinder.
As shown in fig. 4 and 7, the baffle 7 is disposed at the position of the air return hole 1011 of the second chamber 113, and the baffle 7 can make the air in the second chamber 113 smoothly enter the first chamber 112 through the air return hole 1011, so as to reduce energy loss and reduce noise generated during operation of the box body 1.
as shown in fig. 3, in the present embodiment, the gas inlet assembly 5 includes a nitrogen gas inlet unit 502, an air inlet unit 503, and a strip gas distributor 501, and the gas distributor 501 is disposed along the arrangement direction of the injection door 6; the nitrogen gas inlet unit 502 and the air gas inlet unit 503 are respectively connected with the gas distributor 501, and the nitrogen gas inlet unit 502 and the air gas inlet unit 503 are interlocked; specifically, the nitrogen gas inlet unit 502 includes a nitrogen gas source 5021, a pressure reducing valve 5022, a nitrogen gas electric control switch 5023 and a drying module 5024 (such as a drying agent) which are connected in sequence, and the drying module 5024 is connected with one end of the gas distributor 501; the air inlet unit 503 comprises an air electronic control switch 5031, and the air electronic control switch 5031 is connected with the other end of the air distributor 501; nitrogen electrical switch 5023 is electrically or mechanically interlocked with air electrical switch 5031. Of course, in other embodiments, the drying module 5024 and the air electronic control switch 5031 may be connected to the same end of the air distributor 501 through a three-way valve (three-way solenoid valve), that is, the air outlet of the three-way solenoid valve is connected to the same end of the air distributor 501 through an air pipe, and two air inlets of the three-way solenoid valve are connected to the drying module 5024 and the air electronic control switch 5031, respectively, so that the nitrogen gas path and the air gas path are switched through the three-way solenoid valve, which is simpler in structure and more reliable in switching. In actual work, different air inlet units can be switched according to the properties of the coal sample, for example, anthracite and dry bituminous coal with ash-free base volatile components less than 20% are subjected to air drying, anthracite, bituminous coal and lignite are subjected to nitrogen drying, and the rationality of a sample drying mode is ensured through the switching (for example, selection is carried out on an operation interface) of the air inlet assembly 5 according to the properties of the coal sample, so that the applicability of the drying box is improved. In addition, the gas distributor 501 is located at the air inlet 203 of the heating chamber 2 along the arrangement direction of the sample inlet door 6, the gas distributor 501 is a long gas pipe, and a plurality of gas outlets (circular or long-strip-shaped and the like) are arranged on the long gas pipe.
As shown in fig. 1 to 4, in the present embodiment, a temperature detecting member 4 is disposed in the first chamber 112 for detecting the temperature of the gas in the first chamber 112; the heating assembly 302 is connected to the temperature detecting member 4 for receiving the detected gas temperature value and performing heating adjustment to maintain the gas temperature in the first chamber 112 (drying chamber) within a constant range (e.g. 105 ℃ -110 ℃). The temperature detection part 4 is located at a position far away from the heating plate 3021, so that the influence of radiation of the heating plate 3021 is reduced, and the temperature measurement of the working area in the chamber is more accurate. Of course, in other embodiments, the temperature detecting member 4 may be disposed in the second chamber 113 to detect the temperature of the gas in the second chamber 113; the heating assembly 302 is connected to the temperature detecting member 4 for receiving the detected gas temperature value and performing heating adjustment to maintain the gas temperature in the second chamber 113 within a constant range (e.g., 105 ℃ -110 ℃). The temperature detection member 4 is also located at a position far away from the heating chip 3021, so that the influence of radiation from the heating chip 3021 is reduced, and the temperature measurement of the working area in the chamber is more accurate. Specifically, a temperature relay 3022 is arranged on the heating assembly 302, a normally closed contact of the temperature relay 3022 is connected in series in a power supply loop of the heating assembly 302, when the temperature detection piece 4 detects that the temperature is greater than a preset value, the temperature relay 3022 is controlled to operate (or the temperature detection piece 4 sends a temperature signal to the control unit, and the control unit sends a corresponding control instruction after judging the temperature), and the normally closed contact is opened, that is, heating is turned off; of course, the heating power of the heating assembly 302 may also be adjusted. In addition, in other embodiments, the rotation speed of the cross flow fan 3011 may be adjusted according to the temperature value, so as to accelerate the circulation and further improve the drying efficiency. Specifically, as shown in fig. 8, the temperature detection part 4 includes a fixing base 402 and a temperature probe 401, the temperature probe 401 is installed in the fixing base 402, the fixing base 402 is detachably connected (e.g., screwed) to the side wall of the box body 1, and the temperature detection part is convenient to assemble and disassemble and convenient to maintain.
As shown in fig. 3 and 4, in the present embodiment, the sample inlet door 6 includes a door plate 601, and an upper end of the door plate 601 is mounted on the box body 1 through a hinge 602, so that the door plate 601 can be pushed by an external force to turn open towards the inside of the box body 1 or fall back and close under the action of gravity. The door plate 601 is preferably made of stainless steel, and the lower edge of the door plate 601 is curled (for example, in an arc transition shape), so that the door plate 601 can be in smooth transition on the crucible tray; the inner side of the door plate 601 is provided with the heat insulation layer, so that heat dissipation of the first chamber 112 to the outside is reduced, meanwhile, the balance weight of the door plate 601 is increased, the sealing effect of the sample injection door 6 is better ensured, and certainly, a balance weight block can be added on the door plate 601 to ensure the sealing effect; the hinge 602 (for example, in the form of combining the rotating shaft 6021 and the rotating shaft sleeve 6022) connects the door panel 601 and the box body 1, and the hinge 602 needs to ensure flexible movement and the door panel 601 can rotate smoothly under the action of gravity. Of course, a return spring may be provided at the rotating shaft 6021, so that a certain self-closing force is formed between the door plate 601 and the sealing material when the door plate falls back and is closed, thereby further ensuring the sealing effect.
As shown in fig. 4, in the present embodiment, the box body 1 includes a ventilation plate 102, a left side plate 103, an upper flange plate 104, a right side plate 105, a bottom plate 107, a front panel 108, etc., the ventilation plate 102 is fixedly connected to the heating chamber 2, the first communicating hole 1021 and the second communicating hole 1022 are disposed on the ventilation plate 102, the left side plate 103, the upper flange plate 104, the right side plate 105, the bottom plate 107 and the front panel 108 enclose a box body 1 with a square shape or other shape, and the upper flange plate 104 is used for fixing the top cover plate 110. The outer layer of the box body 1 is laid with a heat insulation layer 109 for heat insulation and heat preservation, and the influence of temperature channeling among the box bodies 1 which are arranged side by side is reduced. The shape of the box body 1 can be compatible with the drying operation of the total moisture measurement of 6mm and 13mm coal samples, and the box body is flexibly configured according to the requirements of customers. In addition, the whole box body 1 is flat, so that the circulation of gas in a circulating air channel is facilitated, the shape and the inner space of the box body 1 can be ensured to be minimum, the consumption of nitrogen is reduced under the condition of ensuring the drying efficiency, and the cost of consumables required by drying operation is saved.
the invention also discloses a heat flow circulation control method based on the drying box, which comprises the following steps:
S01, detecting the water vapor concentration in the first chamber 112;
S02, when the detected water vapor concentration does not reach the preset water vapor concentration, controlling the switching door 8 to switch to the first position, blocking the exhaust port 9, and communicating the heating cavity 2 with the second cavity 113 so as to dry the sample in an internal circulation mode; when the detected water vapor concentration reaches the preset water vapor concentration, the switching door 8 is controlled to be switched to the second position, the communication position of the heating cavity 2 and the second cavity 113 is blocked, and the exhaust port 9 is opened to enter an external circulation mode to exhaust water vapor.
According to the heat flow circulation control method based on the drying box, the evaporation of water inside and outside the sample is accelerated to form water vapor through an internal circulation heating mode, the consumption of nitrogen in the cavity is greatly reduced, meanwhile, the power of the heating sheet 3021 can be greatly reduced through the internal circulation heating mode, and the purpose of energy conservation can be achieved; when the concentration of the water vapor in the first chamber 112 reaches or approaches to the saturated vapor pressure, the switching from the internal circulation mode to the external circulation mode is realized by switching the switching door 8 from the first position to the second position, the discharge of the water vapor is accelerated through the exhaust port 9, and the drying efficiency of subsequent samples is further improved; through the matching of the internal and external circulation modes, the sample is quickly dried.
In this embodiment, in step S01, the water vapor concentration of the first chamber 112 in the box 6 is obtained by a water vapor concentration detecting member (not shown) or according to the opening time of the internal circulation mode in the box 6. In step S02, after entering the external circulation mode, the mode is switched to the internal circulation mode after a predetermined time, and then the circulation is performed until the drying is completed.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
Claims (17)
1. The drying box is characterized by comprising a box body (1) and a cavity formed by enclosing the box body (1), wherein a partition plate (101) is arranged in the cavity and used for dividing the cavity into a first cavity (112) and a second cavity (113) which are arranged up and down; one end of the first cavity (112) is provided with a sample introduction door (6), the box body (1) is provided with a heating cavity (2) relative to one end of the sample introduction door (6), the heating cavity (2) is respectively communicated with the first cavity (112) and the second cavity (113), a blast heating assembly (3) is arranged in the heating cavity (2), one side of the partition plate (101) close to the sample introduction door (6) is provided with an air return hole (1011) for communicating the first cavity (112) with the second cavity (113), and the first cavity (112), the heating cavity (2), the second cavity (113) and the air return hole (1011) are sequentially communicated to form a circulating air duct; an air inlet assembly (5) is arranged in the first chamber (112); an exhaust port (9) is arranged at a position, close to the second cavity (113), on the heating cavity (2), and a switching door (8) which is switched between a first position and a second position is arranged at the exhaust port (9) of the heating cavity (2); when the switching door (8) is located at the first position, the exhaust port (9) is blocked by the switching door (8) and the heating cavity (2) is communicated with the second cavity (113) to perform an internal circulation mode; when the switching door (8) is located at the second position, the communication part of the heating cavity (2) and the second cavity (113) is blocked by the switching door (8) and the air outlet (9) is opened to carry out an external circulation mode.
2. A drying cabinet according to claim 1, characterized in that the blowing and heating assembly (3) comprises a blowing assembly (301) and a heating assembly (302), the blowing assembly (301) comprises a cross flow fan (3011), and the cross flow fan (3011) is arranged in a direction corresponding to the width direction of the first chamber (112) or the second chamber (113) for blowing a uniform parallel wind into the first chamber (112) or the second chamber (113).
3. A drying cabinet according to claim 2, characterized in that the cross-flow fan (3011) has an outlet width equal to the width of the first chamber (112) or the second chamber (113).
4. a drying cabinet according to claim 2 or 3, characterized in that the heating assembly (302) is located at the communication of the heating chamber (2) with the second chamber (113) for heating the gas.
5. A drying cabinet according to claim 4, characterized in that the heating assembly (302) is a PTC heating plate (3021) and matches the shape of the communication.
6. A drying cabinet according to claim 5, characterized in that the blower assembly (301) and the heating assembly (302) are both located on a mounting plate (201).
7. A drying cabinet according to claim 2 or 3, characterized in that a temperature detection member (4) is arranged in the first chamber (112) for detecting the temperature of the gas in the first chamber (112); the heating assembly (302) is connected with the temperature detection piece (4) and is used for receiving the detected gas temperature value to perform heating regulation so as to maintain the gas temperature in the first chamber (113) within a constant range; or a temperature detection piece (4) is arranged in the second chamber (113) and is used for detecting the temperature of the gas in the second chamber (113); the heating assembly (302) is connected with the temperature detection piece (4) and is used for receiving the detected gas temperature value to perform heating regulation so as to maintain the gas temperature in the second chamber (113) within a constant range.
8. The drying cabinet according to claim 7, characterized in that the temperature detecting member (4) comprises a fixing base (402) and a temperature measuring probe (401), the fixing base (402) is detachably connected to the cabinet (1), and the temperature measuring probe (401) is installed in the fixing base (402).
9. The drying cabinet according to claim 1, 2 or 3, characterized in that the switching door (8) comprises a door body (801) and a driving mechanism (802), wherein two sides of the door body (801) are rotatably mounted on the heating chamber (2), and the driving mechanism (802) is rotatably connected with the door body (801) and is used for driving the door body (801) to rotate between a first position and a second position.
10. The drying cabinet according to claim 9, wherein the driving mechanism (802) comprises an expansion member (8021) and a rotating plate (8022), one side of the rotating plate (8022) is fixedly connected to the rotating end of the door body (801), the other side of the rotating plate (8022) is rotatably connected to the expansion end of the expansion member (8021), and the expansion and contraction of the expansion member (8021) drives the rotating plate (8022) to rotate, so that the door body (801) rotates between the first position and the second position.
11. A drying box according to claim 10, characterised in that the telescopic member (8021) comprises a telescopic cylinder.
12. the cabinet according to any one of claims 1 to 4, characterized in that the air intake assembly (5) comprises a nitrogen intake unit (502), an air intake unit (503) and an elongated gas distributor (501), the gas distributor (501) being mounted in the first chamber (112) adjacent to the heating chamber (2); the nitrogen gas inlet unit (502) and the air inlet unit (503) are respectively connected with the gas distributor (501), and the nitrogen gas inlet unit (502) and the air inlet unit (503) are interlocked.
13. The drying cabinet according to claim 12, characterized in that the nitrogen gas inlet unit (502) comprises a nitrogen gas source (5021), a pressure reducing valve (5022), a nitrogen gas electrically-controlled switch (5023) and a drying module (5024) which are connected in sequence, wherein the drying module (5024) is connected with one end of the gas distributor (501); the air inlet unit (503) comprises an air electronic control switch (5031), and the air electronic control switch (5031) is connected with the other end of the gas distributor (501) or connected with one end of the gas distributor (501) through a three-way valve; the nitrogen electronic control switch (5023) and the air electronic control switch (5031) are electrically or mechanically interlocked.
14. The drying cabinet according to any one of claims 1 to 3, characterized in that the sample introduction door (6) comprises a door panel (601), and the upper end of the door panel (601) is mounted on the cabinet (1) through a hinge (602) so that the door panel (601) can be turned open towards the inside of the cabinet (1) under the pushing of an external force or fall back and close under the action of gravity.
15. A heat flow cycle control method based on the drying box of any one of claims 1 to 14, characterized by comprising the steps of:
S01, detecting the water vapor concentration in the first chamber (112);
s02, when the detected water vapor concentration does not reach the preset water vapor concentration, controlling the switching door (8) to switch to the first position, blocking the exhaust port (9), and communicating the heating cavity (2) with the second cavity (113) so as to dry the sample in an internal circulation mode; when the detected water vapor concentration reaches the preset water vapor concentration, the switching door (8) is controlled to be switched to the second position, the communication position of the heating cavity (2) and the second cavity (113) is blocked, and the exhaust port (9) is opened to enter an external circulation mode to exhaust water vapor.
16. the heat flow cycle control method of claim 15, wherein in step S01, the water vapor concentration of the first chamber (112) is obtained by a water vapor concentration detecting member or by an internal circulation mode opening time.
17. The heat flow cycle control method of claim 15, wherein in step S02, after entering the external cycle mode, the mode is switched to the internal cycle mode after a predetermined time.
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