CN112728925B - High-capacity circulating heating and drying system and heating and drying method thereof - Google Patents
High-capacity circulating heating and drying system and heating and drying method thereof Download PDFInfo
- Publication number
- CN112728925B CN112728925B CN202011432691.4A CN202011432691A CN112728925B CN 112728925 B CN112728925 B CN 112728925B CN 202011432691 A CN202011432691 A CN 202011432691A CN 112728925 B CN112728925 B CN 112728925B
- Authority
- CN
- China
- Prior art keywords
- drying
- gas
- valve
- heating
- air
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/10—Temperature; Pressure
-
- 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
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/12—Velocity of flow; Quantity of flow, e.g. by varying fan speed, by modifying cross flow area
-
- 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
- F26B21/14—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects using gases or vapours other than air or steam, e.g. inert gases
-
- 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
- F26B25/001—Handling, e.g. loading or unloading arrangements
- F26B25/002—Handling, e.g. loading or unloading arrangements for bulk goods
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses a high-capacity circulating heating and drying system and a heating and drying method thereof, which are suitable for heating and drying all kinds of coal samples, are used for detecting the moisture content in the coal samples or enabling the coal samples to reach an air balance state, and belong to the field of coal quality inspection and acceptance. The system comprises a gas conveying and pretreatment device, a heating and drying device and a gas purification and circulation device, wherein the three devices are connected in pairs through gas pipelines to form a loop. Through the selection to three kinds of gaseous regulation modes, realized leading to nitrogen drying and air drying's double-purpose function, both can realize the heating drying test efficiency of at utmost simultaneously, also can handle back circulation recycle to nitrogen gas, effectively reduced the nitrogen gas use cost.
Description
Technical Field
The invention relates to a high-capacity circulating heating and drying system and a heating and drying method thereof, which are suitable for heating and drying all kinds of coal samples, are used for detecting the moisture content in the coal samples or enabling the coal samples to reach an air balance state, and belong to the field of coal quality inspection and acceptance.
Background
Moisture is one of the important coal quality analysis parameters in coal quality inspection and acceptance work. For coal entering a factory, too high moisture not only can influence the quality acceptance of the number of coals of a power generation enterprise, but also can cause oxidation spontaneous combustion of open-air stored coal; for coal as fired, water is evaporated to consume heat, water vapor increases the amount of flue gas, the heat loss of flue gas and the power consumption of a draught fan are increased, meanwhile, the temperature of a hearth is reduced, coal dust is difficult to catch fire, and the stability of catching fire and burning of the coal dust and the safe and economical operation of a boiler unit are directly influenced. Before a laboratory detects a common coal sample for analysis and test, the prepared coal sample needs to be heated and dried to evaporate water in the coal sample so as to enable the coal sample to reach an air balance state. Therefore, no matter the moisture content of the coal sample is detected or the coal sample reaches an air balance state, the proper method and equipment are required to be selected in the process of heating and drying the coal sample, and the drying process is guaranteed to be standard and free from errors, and the detection result is accurate and reliable.
Lignite and young bituminous coal such as long-flame coal cannot be dried by a common air heating and drying method because of easy oxidative deterioration, and a coal sample is heated and dried in an oxygen-isolated environment by introducing nitrogen to avoid oxidative deterioration. At present, the mainstream nitrogen-introducing drying equipment is generally directly connected with a drying box or a drying box with a small volume by a nitrogen bottle, and is heated and dried under the condition of continuously introducing nitrogen. The equipment has a series of defects and shortcomings, the first is that the introduced nitrogen is heated and dried and then directly discharged into the air without being treated and then recycled, and relatively large waste is caused; secondly, the nitrogen is in a normal temperature state before entering the heating device, the temperature in the heating device is higher, and at the moment, after a large amount of nitrogen in the normal temperature state enters the heating device, the temperature field in the device can fluctuate, so that the stable preset temperature in the device is changed, and the test result is influenced; thirdly, considering the influence of factors such as nitrogen cost, heating temperature stability and the like, the volume of the current mainstream nitrogen-introducing drying equipment is smaller, so that the number of tests which can be simultaneously carried out each time is smaller, and the test efficiency is not high; and fourthly, only a nitrogen gas circuit is arranged in the gas circuit of most nitrogen-introducing drying equipment, and no air gas circuit is arranged, so that nitrogen introduction drying can be carried out only, air drying cannot be carried out, and only air drying is carried out for coal types which are difficult to oxidize and deteriorate, such as anthracite, lean coal and the like, without nitrogen introduction drying, and the utilization rate is limited.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a high-capacity circulating heating and drying system and a heating and drying method thereof, which are reasonable in structural design and simple and reliable in test method, are suitable for heating and drying all kinds of coal samples, are used for detecting the moisture content in the coal samples or enabling the coal samples to reach an air balance state, and solve the problems that the cost is high due to the fact that a large amount of nitrogen is wasted in the existing coal sample heating and drying process, the test result is influenced due to the fact that a temperature field in a device is changed, the equipment volume is small, the test efficiency is underground, a single gas path cannot be used for nitrogen/air double-function heating and drying, and the like.
The technical scheme adopted by the invention for solving the problems is as follows: a high-capacity circulating heating and drying system is characterized by comprising a gas conveying and preprocessing device, a heating and drying device and a gas purifying and circulating device, wherein the three devices are connected in pairs through gas pipelines to form a loop.
The gas conveying and pretreatment device comprises: gas cylinder, gas storage tank, A drying tube, gas heater, rotameter, relief pressure valve, A valve and B valve, the export of gas cylinder is through the import intercommunication of B valve and relief pressure valve and gas storage tank, the A valve also communicates with the relief pressure valve, and A valve and B valve parallel arrangement, rotameter, A drying tube and gas heater are connected gradually in the export of gas storage tank.
The heating and drying device includes: device shell, thermometer A, adiabatic base, fan, heater, thermometer B and baffle, wherein the air inlet and the gas outlet at the device shell are installed respectively to thermometer A and thermometer B, gas heater is connected with the air inlet of device shell, the inside wall at the device shell is installed to the heater, the inboard bottom at the device shell is installed to the fan, adiabatic pedestal mounting is in device shell outside bottom, the baffle is installed in the inside of device shell and is had multilayer structure.
The gas purification and circulation device comprises: the drying device comprises a drying pipe B, a drying pipe C, a drying pipe D, an air pump, a valve C and a valve D, wherein the drying pipe B, the drying pipe C, the drying pipe D and the air pump are sequentially connected, an air outlet of a device shell is connected with the drying pipe B, the valve C is connected with an outlet of the air pump, and the air pump is connected with an air storage box through the valve D.
Further, in the gas conveying and preprocessing device, the gas steel cylinder is used for supplying nitrogen in a nitrogen introducing and drying process. The valve A and the valve B can be opened and closed, wherein the valve A is used for connecting the whole system and the external atmosphere, and the valve B is used for connecting a gas steel cylinder and a pressure reducing valve. The pressure reducing valve is used for controlling the pressure state of the whole system. The gas storage box comprises a piston which can move up and down, the piston can move freely according to the volume of gas in the gas storage box, and the gas storage box is used for storing gas in the working process of the whole system. The rotameter is used for controlling the gas flow in the whole system in the heating and drying process. The drying tube A is made of transparent glass, wherein the upper two thirds of the drying tube A are filled with deoxidizing agents for removing residual oxygen in gas; the lower third is filled with cobalt chloride which indicates whether there is any oxygen remaining in the oxygen-depleted gas, and the pure cobalt chloride is light blue and turns deep red after contacting oxygen and water. The gas preheater has a zigzag pipeline, the inner wall of the gas preheater comprises a heating element, and the gas preheater is used for fully heating the gas in the pipeline.
Further, in the heating and drying apparatus, the thermometer a and the thermometer B are used to indicate the temperatures of the gas at the time of entering and exiting the apparatus, respectively. The heat insulation base and the device shell are used for isolating the device from the external environment, and the influence of the external environment on the test process is reduced. The fan can accelerate the gas flow in the device and accelerate the stability of the temperature field. The heater is used for heating the interior of the device, and can be heated to a preset temperature and maintain stability after the temperature is preset according to test requirements. The baffle is arranged from top to bottom in the device in multiple layers, and the baffle is in a hollow stainless steel bracket form and is used for placing coal samples needing to be heated and dried.
Further, in the gas purification and circulation device, the drying tube B, the drying tube C and the drying tube D are all made of transparent glass materials, wherein the drying tube B is filled with calcium chloride and is used for absorbing moisture in gas exhausted from the heating and drying device. The drying pipe C is filled with alkali asbestos and is used for absorbing carbon dioxide and other acid gas impurities in the gas exhausted from the heating and drying device. The upper two thirds of the drying tube D are filled with calcium chloride for further absorbing moisture in the gas, the lower one third of the drying tube D is filled with copper sulfate for indicating whether residual moisture exists in the gas, and the copper sulfate is light blue and turns dark blue after contacting with water. The air pump can be opened and closed, and is used for enabling the air in the air path of the system to flow when the whole system is in pressure balance. The valve C and the valve D can be opened and closed, the valve C is connected with the air pump and the outside atmosphere, and the valve D is connected with the air pump and the air storage tank.
Furthermore, when the valve A and the valve C are closed and the valve B and the valve D are opened, the whole system is in an externally closed and internally communicated state.
Furthermore, when the reagent in any drying tube in the whole system is failed, the reagent can be replaced.
Further, the whole system can adopt three different gas regulation modes, namely a normal mode, a high-efficiency mode and an air drying mode, wherein the normal mode is a circulating nitrogen-introducing drying mode with fixed nitrogen content, the high-efficiency mode is a non-circulating nitrogen-introducing drying mode in which nitrogen is continuously filled into a gas steel cylinder and residual gas is discharged from a valve C, and the air drying mode is a non-circulating air drying mode in which air is sucked from a valve A and the residual gas is discharged from a valve C.
Further, among the three gas conditioning modes, the normal mode and the high efficiency mode are applicable to all kinds of coal, and the air drying mode is applicable to bituminous coal and anthracite coal.
The heating and drying method of the high-capacity circulating heating and drying system comprises the following steps:
before the test is started, one third of cobalt chloride is filled in the lower part of a drying pipe A, two thirds of deoxidizing agent is filled in the upper part of the drying pipe A, calcium chloride is filled in a drying pipe B, alkali asbestos is filled in a drying pipe C, one third of copper sulfate is filled in the lower part of a drying pipe D, two thirds of calcium chloride is filled in the upper part of the drying pipe D, the corresponding reagents are guaranteed to be in an effective usable state, and coal samples to be heated and dried are respectively placed in each layer of a partition plate.
And (II) adjusting the pressure reducing valve to a proper pressure, closing the valve A, the valve B and the valve D, and opening the valve C. And starting the air pump to exhaust air in the whole system, wherein the system is in a vacuum negative pressure state at the moment, the piston in the air storage box is at the topmost end, and the effective volume of the air storage box at the moment is zero.
And (III) regulating the type and content of the gas.
1) The conventional mode adjustment method is as follows: closing the valve A and the valve C, opening the valve B and the valve D, opening a gas steel cylinder, filling nitrogen into the whole system, moving a piston in a gas storage tank downwards at the moment, closing the gas steel cylinder when the piston moves downwards to a position about one third away from the bottom, closing the system to the outside at the moment, filling nitrogen into the system at the same time, and closing the valve B at the moment;
2) the efficient mode adjustment method is as follows: closing the valve A and the valve D, opening the valve B and the valve C, opening a gas steel cylinder, filling nitrogen into the whole system, moving a piston in a gas storage tank downwards to the bottom, and filling the system in a one-way opening state to the outside while filling nitrogen into the system;
3) the air drying mode adjustment method is as follows: and closing the valve B and the valve D, and opening the valve A and the valve C, so that the system is in a bidirectional opening state to the outside, and simultaneously, the system is filled with air.
And (IV) adjusting the rotameter to a proper gas flow rate, starting the gas preheater and the heater to start heating, observing the readings of the thermometer A and the thermometer B, confirming that the preset temperature is reached, starting the fan, and heating the interior of the drying device to start effective gas flow.
And (V) according to standard requirements related to moisture heating and drying such as a GB/T211 and 2017 coal total moisture measuring method, GB/T212 and 2008 coal industrial analysis method and the like, carrying out heating and drying on coal samples of different types and particle sizes for a standard specified time.
Observing the color changes of cobalt chloride in the drying tube A and copper sulfate in the drying tube D in the test process, wherein when the color of the cobalt chloride is changed into deep red, the deoxidizer is proved to be invalid, and a certain amount of oxygen exists in the gas in the system; when the color of the copper sulfate is changed into dark blue, the calcium chloride and the alkali asbestos are invalid, a certain amount of moisture exists in gas in the system, and corresponding reagents in the drying tube A, the drying tube B, the drying tube C and/or the drying tube D need to be replaced.
And (seventhly), after the test is finished, taking out the coal sample in the heating and drying device, closing the gas steel cylinder, the gas preheater, the heater and the air pump, opening all valves and exhausting residual gas in the system.
Compared with the prior art, the invention has the following advantages and effects:
the invention is used for detecting the moisture content in the coal sample or enabling the moisture content to reach the air balance state, realizes the double functions of nitrogen-introducing drying and air drying by selecting three gas adjusting modes, is suitable for all coal types, can realize the maximum heating and drying test efficiency, can recycle the processed nitrogen, and effectively reduces the use cost of the nitrogen. In addition, the temperature field in the device can be more uniform and stable by preheating the gas in advance, and the accuracy of the result of simultaneously testing a plurality of coal samples in a large-capacity state of the device is ensured. The device in the system has reasonable structural design, simple and convenient test method and accurate and reliable detection result.
Drawings
Fig. 1 is a schematic view of the overall structure of a large-capacity circulation heating drying system according to an embodiment of the present invention.
FIG. 2 is a schematic structural diagram of a gas delivery and pretreatment device according to an embodiment of the present invention.
Fig. 3 is a schematic structural view of a heating and drying apparatus according to an embodiment of the present invention.
FIG. 4 is a schematic structural diagram of a gas purification and circulation apparatus according to an embodiment of the present invention.
In the figure: the system comprises a gas conveying and preprocessing device 1, a gas steel cylinder 11, a gas storage tank 12, an A drying pipe 13, a gas preheater 14, a rotor flow meter 15, a pressure reducing valve 16, an A valve 17 and a B valve 18;
a heating and drying device 2, a device case 21, an A thermometer 22, a heat insulating base 23, a fan 24, a heater 25, a B thermometer 26, and a partition plate 27;
the device comprises a gas purification and circulation device 3, a B drying pipe 31, a C drying pipe 32, a D drying pipe 33, an air pump 34, a C valve 35 and a D valve 36.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Referring to fig. 1 to 4, a large-capacity circulation heating and drying system comprises a gas conveying and pretreatment device 1, a heating and drying device 2 and a gas purification and circulation device 3, wherein the three devices are connected in pairs through gas pipelines to form a loop.
The gas delivery and pretreatment device 1 includes: the gas cylinder 11, the gas storage tank 12, the A drying pipe 13, the gas preheater 14, the rotameter 15, the pressure reducing valve 16, the A valve 17 and the B valve 18, wherein the outlet of the gas cylinder 11 is communicated with the inlet of the gas storage tank 12 through the B valve 18 and the pressure reducing valve 16, the A valve 17 is also communicated with the pressure reducing valve 16, the A valve 17 and the B valve 18 are arranged in parallel, and the outlet of the gas storage tank 12 is sequentially connected with the rotameter 15, the A drying pipe 13 and the gas preheater 14.
The heating and drying device 2 includes: the device comprises a device shell 21, an A thermometer 22, a heat insulation base 23, a fan 24, a heater 25, a B thermometer 26 and a partition plate 27, wherein the A thermometer 22 and the B thermometer 26 are respectively arranged at an air inlet and an air outlet of the device shell 21, the gas preheater 14 is connected with the air inlet of the device shell 21, the heater 25 is arranged on the inner side wall of the device shell 21, the fan 24 is arranged at the bottom of the inner side of the device shell 21, the heat insulation base 23 is arranged at the bottom of the outer side of the device shell 21, and the partition plate 27 is arranged in the device shell 21 and has a multilayer structure.
The gas purification and circulation device 3 includes: the drying device comprises a drying pipe B31, a drying pipe C32, a drying pipe D33, an air pump 34, a valve C35 and a valve D36, wherein the drying pipe B31, the drying pipe C32, the drying pipe D33 and the air pump 34 are sequentially connected, an air outlet of the device shell 21 is connected with the drying pipe B31, the valve C35 is connected with an outlet of the air pump 34, and the air pump 34 is connected with the air storage box 12 through the valve D36.
Specifically, in the gas delivery and pretreatment device 1, the gas cylinder 11 is used for supplying nitrogen gas in a nitrogen-introducing drying process. The a valve 17 and the B valve 18 can be opened and closed, wherein the a valve 17 is used to connect the entire system to the outside atmosphere, and the B valve 18 is used to connect the gas cylinder 11 to the pressure reducing valve 16. The pressure reducing valve 16 is used to control the pressure state of the entire system. The gas storage tank 12 comprises a piston which can move up and down, the piston can move freely according to the volume of gas in the gas storage tank 12, and the gas storage tank 12 is used for storing the gas in the working process of the whole system. The rotameter 15 is used to control the gas flow in the whole system of the heat drying process. The drying tube A13 is made of transparent glass, wherein the upper two thirds of the drying tube A are filled with deoxidizing agent for removing residual oxygen in the gas; the lower third is filled with cobalt chloride which indicates whether there is any oxygen remaining in the oxygen-depleted gas, and the pure cobalt chloride is light blue and turns deep red after contacting oxygen and water. The gas preheater 14 has a meandering tube whose inner wall contains heating elements, and the gas preheater 14 is used to sufficiently heat the gas in the tube.
Specifically, in the heating and drying apparatus 2, the a thermometer 22 and the B thermometer 26 are used to indicate the temperatures at which the gas enters and exits the apparatus, respectively. The heat-insulating base 23 and the device shell 21 are used for isolating the device from the external environment, and the influence of the external environment on the test process is reduced. The fan 24 can accelerate the gas flow in the device and accelerate the stabilization of the temperature field. The heater 25 is used for heating the interior of the device, and after the temperature is preset according to test requirements, the heater 25 can be heated to the preset temperature and is kept stable. Baffle 27 is arranged from top to bottom the multilayer in the device, and baffle 27 is fretwork stainless steel support form for place the dry coal sample of needs heating.
Specifically, in the gas purification and circulation device 3, the B drying tube 31, the C drying tube 32, and the D drying tube 33 are all made of transparent glass, and the B drying tube 31 contains calcium chloride for absorbing moisture in the gas discharged from the heating and drying device 2. The C drying pipe 32 contains alkali asbestos for absorbing other acidic gas impurities such as carbon dioxide in the gas discharged from the heating and drying apparatus 2. The upper two thirds of the drying tube 33 in D contain calcium chloride to further absorb moisture in the gas and the lower third contains copper sulphate to indicate if there is residual moisture in the gas, the copper sulphate being light blue and turning dark blue on contact with water. The pump 34 may be turned on and off to allow gas to flow in the system gas path when the entire system is pressure balanced. The C valve 35 and the D valve 36 can be opened and closed, the C valve 35 is connected with the air pump 34 and the outside atmosphere, and the D valve 36 is connected with the air pump 34 and the air storage tank 12.
Specifically, the whole system is in a state of external sealing and internal circulation when the valve A17 and the valve C35 are closed and the valve B18 and the valve D36 are opened.
Specifically, when the reagent in any drying tube in the whole system is failed, the reagent can be replaced.
Specifically, the entire system may adopt three different gas conditioning modes, which are a normal mode, a high-efficiency mode, and an air drying mode, wherein the normal mode is a cyclic nitrogen-introducing drying mode in which the nitrogen content is fixed, the high-efficiency mode is a non-cyclic nitrogen-introducing drying mode in which nitrogen is continuously introduced from the gas cylinder 11 and the residual gas is discharged from the C valve 35, and the air drying mode is a non-cyclic air drying mode in which air is taken in from the a valve 17 and the residual gas is discharged from the C valve 35.
Specifically, among the three gas conditioning modes, the normal mode and the high efficiency mode are applicable to all kinds of coal, and the air drying mode is applicable to bituminous coal and anthracite coal.
The heating and drying method of the large-capacity circulating heating and drying system comprises the following steps:
before the test is started, cobalt chloride with one third volume is filled in the lower part of the drying tube A13, deoxidizing agent with two thirds volume is filled in the upper part of the drying tube A, calcium chloride is filled in the drying tube B31, alkali asbestos is filled in the drying tube C32, copper sulfate with one third volume is filled in the drying tube D33, calcium chloride with two thirds volume is filled in the upper part of the drying tube D, the corresponding reagents are ensured to be in an effective usable state, and coal samples to be heated and dried are respectively placed in each layer of the partition plate 27.
And (II) adjusting the pressure reducing valve 16 to a proper pressure, closing the A valve 17, the B valve 18 and the D valve 36, and opening the C valve 35. The air pump 34 is turned on to exhaust the air in the entire system, the system is in a vacuum state, the piston in the air storage tank 12 is at the top, and the effective volume of the air storage tank 12 is zero at this time.
And (III) regulating the type and content of the gas.
1) The conventional mode adjustment method is as follows: closing the valve A17 and the valve C35, opening the valve B18 and the valve D36, opening the gas steel cylinder 11, filling the nitrogen in the nitrogen into the whole system, moving the piston in the gas storage tank 12 downwards at the moment, closing the gas steel cylinder 11 when the piston moves downwards to a position about one third away from the bottom, closing the system to the outside at the moment, filling the nitrogen in the system at the same time, and closing the valve B18 at the moment;
2) the efficient mode adjustment method is as follows: closing the valve A17 and the valve D36, opening the valve B18 and the valve C35, opening the gas steel cylinder 11, filling the nitrogen in the nitrogen into the whole system, moving the piston in the gas storage tank 12 downwards to the bottom, and enabling the system to be in a one-way opening state to the outside at the moment, and filling the nitrogen in the system;
3) the air drying mode adjustment method is as follows: the B valve 18 and the D valve 36 are closed, and the A valve 17 and the C valve 35 are opened, so that the system is in a bidirectional opening state to the outside, and simultaneously, the system is filled with air.
(IV) adjusting the rotameter 15 to the appropriate gas flow rate, turning on the gas preheater 14 and the heater 25, starting heating, observing the readings of the thermometer A22 and the thermometer B26, confirming that the preset temperature is reached, turning on the fan 24, and starting the effective gas flow inside the heating and drying apparatus 2.
And (V) according to standard requirements related to moisture heating and drying such as a GB/T211 and 2017 coal total moisture measuring method, GB/T212 and 2008 coal industrial analysis method and the like, carrying out heating and drying on coal samples of different types and particle sizes for a standard specified time.
(VI) observing the color change of the cobalt chloride in the drying tube A13 and the copper sulfate in the drying tube D33 in the test process, wherein when the color of the cobalt chloride is changed into deep red, the deoxidizer is proved to be invalid, and a certain amount of oxygen exists in the gas in the system; when the color of the copper sulfate changes to dark blue, which indicates that the calcium chloride and the alkali rock wool are invalid, a certain amount of moisture exists in the gas in the system, and at this time, the corresponding reagents in the drying tube A13, the drying tube B31, the drying tube C32 and/or the drying tube D33 need to be replaced.
And (seventhly), after the test is finished, taking out the coal sample in the heating and drying device, closing the gas steel cylinder 11, the gas preheater 14, the heater 25 and the air pump 34, opening all valves and exhausting residual gas in the system.
Those not described in detail in this specification are well within the skill of the art.
Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (9)
1. A high-capacity circulating heating and drying system is characterized by comprising a gas conveying and pretreatment device (1), a heating and drying device (2) and a gas purifying and circulating device (3);
the gas delivery and pretreatment device (1) comprises: the gas cylinder comprises a gas steel cylinder (11), a gas storage tank (12), an A drying pipe (13), a gas preheater (14), a rotor flow meter (15), a pressure reducing valve (16), an A valve (17) and a B valve (18), wherein an outlet of the gas steel cylinder (11) is communicated with an inlet of the gas storage tank (12) through the B valve (18) and the pressure reducing valve (16), the A valve (17) is also communicated with the pressure reducing valve (16), the A valve (17) and the B valve (18) are arranged in parallel, and an outlet of the gas storage tank (12) is sequentially connected with the rotor flow meter (15), the A drying pipe (13) and the gas preheater (14);
the heating and drying device (2) comprises: the device comprises a device shell (21), an A thermometer (22), a heat insulation base (23), a fan (24), a heater (25), a B thermometer (26) and a partition plate (27), wherein the A thermometer (22) and the B thermometer (26) are respectively installed at an air inlet and an air outlet of the device shell (21), the gas preheater (14) is connected with the air inlet of the device shell (21), the heater (25) is installed on the inner side wall of the device shell (21), the fan (24) is installed at the bottom of the inner side of the device shell (21), the heat insulation base (23) is installed at the bottom of the outer side of the device shell (21), the partition plate (27) is installed inside the device shell (21), and the partition plate (27) has a multilayer structure;
the gas purification and circulation device (3) comprises: the drying device comprises a drying pipe B (31), a drying pipe C (32), a drying pipe D (33), an air pump (34), a valve C (35) and a valve D (36), wherein the drying pipe B (31), the drying pipe C (32), the drying pipe D (33) and the air pump (34) are sequentially connected, an air outlet of a device shell (21) is connected with the drying pipe B (31), the valve C (35) is connected with an outlet of the air pump (34), and the air pump (34) is connected with an air storage box (12) through the valve D (36).
2. A high capacity circulation heating drying system as claimed in claim 1, wherein, in the gas delivery and pre-treatment device (1), the gas cylinder (11) is used for supplying nitrogen gas during the nitrogen-supplying drying process; the valve A (17) and the valve B (18) can be opened and closed, wherein the valve A (17) is used for connecting the whole system with the outside atmosphere, the valve B (18) is used for connecting the gas steel cylinder (11) and the pressure reducing valve (16), and the pressure reducing valve (16) is used for controlling the pressure state of the whole system; the gas storage box (12) comprises a piston capable of moving up and down, the piston can move freely according to the volume of gas in the gas storage box (12), and the gas storage box (12) is used for storing the gas in the working process of the whole system; the rotameter (15) is used for controlling the gas flow in the whole system of the heating and drying process; the drying tube A (13) is made of transparent glass, two thirds of the upper part of the drying tube A are provided with deoxidizing agents for removing residual oxygen in the gas, and one third of the lower part of the drying tube A is provided with cobalt chloride for indicating whether oxygen remains in the gas after the deoxidization; the pipeline in the gas preheater (14) is tortuous, the inner wall of the gas preheater contains a heating element, and the gas preheater (14) is used for fully heating the gas in the pipeline.
3. A high capacity circulation heating drying system according to claim 1, wherein in the heating drying device (2), the a thermometer (22) and the B thermometer (26) are used for indicating the temperatures of the gas entering and exiting the device, respectively; the heat insulation base (23) and the device shell (21) are used for isolating the device from the external environment, so that the influence of the external environment on the test process is reduced; the fan (24) is used for accelerating the gas flow in the device and accelerating the stability of a temperature field; the heater (25) is used for heating the interior of the device, and after the temperature is preset according to test requirements, the heater (25) can be heated to the preset temperature and is kept stable.
4. The high capacity circulation heating drying system according to claim 1, wherein in the gas purification and circulation device (3), the drying tube B (31), the drying tube C (32) and the drying tube D (33) are all made of transparent glass, wherein the drying tube B (31) contains calcium chloride for absorbing moisture in the gas exhausted from the heating drying device (2); the drying pipe (32) is filled with alkali asbestos and is used for absorbing acid gas impurities in the gas exhausted from the heating and drying device (2); the upper two thirds of the drying tube (33) are filled with calcium chloride for further absorbing moisture in the gas, and the lower one third of the drying tube is filled with copper sulfate for indicating whether residual moisture exists in the gas; the air suction pump (34) can be opened and closed and is used for enabling the air in the air path of the system to flow when the whole system is in pressure balance; the C valve (35) and the D valve (36) can be opened and closed, the C valve (35) is connected with the air pump (34) and the outside atmosphere, and the D valve (36) is connected with the air pump (34) and the air storage tank (12).
5. The high-capacity circulation heating drying system as claimed in claim 1 or 4, wherein the whole system is in a state of external sealing and internal circulation when the A valve (17) and the C valve (35) are closed and the B valve (18) and the D valve (36) are opened.
6. A high capacity hydronic drying system according to claim 1, 2 or 4, where the reagents in any drying tube in the entire system can be replaced if they fail.
7. The high capacity circulation heating drying system according to claim 1, wherein the whole system adopts three different gas conditioning modes, which are a normal mode, a high efficiency mode and an air drying mode, wherein the normal mode is a circulation nitrogen-introducing drying mode with a fixed nitrogen content, the high efficiency mode is a non-circulation nitrogen-introducing drying mode in which nitrogen is continuously introduced from the gas cylinder (11) and the residual gas is discharged from the C valve (35), and the air drying mode is a non-circulation air drying mode in which air is introduced from the a valve (17) and the residual gas is discharged from the C valve (35).
8. The large capacity circulation heating drying system as claimed in claim 7, wherein the normal mode and the high efficiency mode are applied to all kinds of coal and the air drying mode is applied to bituminous coal and anthracite coal among the three gas conditioning modes.
9. A heat drying method of a large capacity circulation heat drying system as claimed in any one of claims 1 to 8, characterized by comprising the steps of:
before the test is started, one third volume of cobalt chloride is filled in the lower part of a drying pipe (13) A, two thirds volume of deoxidizing agent is filled in the upper part of the drying pipe A, calcium chloride is filled in a drying pipe (31) B, alkali asbestos is filled in a drying pipe (32) C, one third volume of copper sulfate is filled in the lower part of a drying pipe (33) D, two thirds volume of calcium chloride is filled in the upper part of the drying pipe D, corresponding reagents are ensured to be in an effective usable state, and coal samples to be heated and dried are respectively placed in each layer of a partition plate (27);
(II) adjusting the pressure reducing valve (16) to a proper pressure, closing the valve A (17), the valve B (18) and the valve D (36), and opening the valve C (35); starting an air pump (34) to exhaust air in the whole system, wherein the system is in a vacuum negative pressure state at the moment, a piston in the air storage box (12) is at the topmost end, and the effective volume of the air storage box (12) is zero at the moment;
(III) regulating the type and content of the gas;
1) the conventional mode adjustment method is as follows: closing the valve A (17) and the valve C (35), opening the valve B (18) and the valve D (36), opening the gas steel cylinder (11), filling nitrogen into the whole system, moving the piston in the gas storage tank (12) downwards at the moment, closing the gas steel cylinder (11) when the piston moves downwards to a position about one third away from the bottom, closing the system to the outside at the moment, filling nitrogen into the system at the same time, and closing the valve B (18) at the moment;
2) the efficient mode adjustment method is as follows: closing the valve A (17) and the valve D (36), opening the valve B (18) and the valve C (35), starting the gas steel cylinder (11) to fill nitrogen into the whole system, moving a piston in the gas storage tank (12) downwards to the bottom, and enabling the system to be in a one-way open state to the outside and simultaneously filling nitrogen into the system;
3) the air drying mode adjustment method is as follows: closing the valve B (18) and the valve D (36), and opening the valve A (17) and the valve C (35), so that the system is in a bidirectional opening state to the outside, and is filled with air;
(IV) adjusting the rotameter (15) to a proper gas flow rate, starting a gas preheater (14) and a heater (25), starting heating, observing the readings of the thermometer A (22) and the thermometer B (26), confirming that the preset temperature is reached, starting a fan (24), and starting effective gas flow in the heating and drying device (2);
fifthly, heating and drying coal samples of different types and different particle sizes for a standard specified time;
sixthly, observing the color change of cobalt chloride in the drying tube A (13) and copper sulfate in the drying tube D (33) in the test process, wherein when the color of the cobalt chloride is changed into deep red, the deoxidizer is proved to be invalid, and a certain amount of oxygen exists in the gas in the system; when the color of the copper sulfate is changed into dark blue, the calcium chloride and the alkali asbestos are out of work, a certain amount of moisture exists in gas in the system, and corresponding reagents in the drying tube A (13), the drying tube B (31), the drying tube C (32) and/or the drying tube D (33) are replaced;
and (seventhly), after the test is finished, taking out the coal sample in the heating and drying device, closing the gas steel cylinder (11), the gas preheater (14), the heater (25) and the air pump (34), opening all valves and exhausting residual gas in the system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011432691.4A CN112728925B (en) | 2020-12-09 | 2020-12-09 | High-capacity circulating heating and drying system and heating and drying method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011432691.4A CN112728925B (en) | 2020-12-09 | 2020-12-09 | High-capacity circulating heating and drying system and heating and drying method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112728925A CN112728925A (en) | 2021-04-30 |
| CN112728925B true CN112728925B (en) | 2022-05-20 |
Family
ID=75598701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011432691.4A Active CN112728925B (en) | 2020-12-09 | 2020-12-09 | High-capacity circulating heating and drying system and heating and drying method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112728925B (en) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2949720C2 (en) * | 1979-12-11 | 1982-08-26 | Alfelder Eisenwerke Carl Heise, KG vorm. Otto Wesselmann & Cie., 3220 Alfeld | Method and device for drying and heating moist coal |
| JPH06337194A (en) * | 1993-05-26 | 1994-12-06 | Toho Gas Co Ltd | High-temperature hot air drying device |
| US20070119749A1 (en) * | 2005-11-29 | 2007-05-31 | Varagani Rajani K | Coal upgrading utilizing nitrogen |
| KR101701693B1 (en) * | 2008-08-12 | 2017-02-13 | 슈빙 바이오셋 | Closed loop drying system and method |
| CN203224122U (en) * | 2013-04-11 | 2013-10-02 | 国家电网公司 | Intelligent drying oven allowing heating media to be selected |
| CN107131754A (en) * | 2017-06-29 | 2017-09-05 | 长沙开元仪器股份有限公司 | A kind of logical nitrogen drying means and device |
| CN108151478A (en) * | 2017-12-08 | 2018-06-12 | 北京神雾电力科技有限公司 | A kind of system and method for coal dust drying |
| CN214665640U (en) * | 2020-12-09 | 2021-11-09 | 华电电力科学研究院有限公司 | High-capacity circulation heating and drying system |
-
2020
- 2020-12-09 CN CN202011432691.4A patent/CN112728925B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN112728925A (en) | 2021-04-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN214665640U (en) | High-capacity circulation heating and drying system | |
| CN101852538B (en) | High-temperature heat pump drying device | |
| CN105080278A (en) | Oil and gas recovery method | |
| CN105757983A (en) | Condensing boiler | |
| US8388902B2 (en) | Method and apparatus for regenerating activated coke used for treating wastewater or sewage | |
| CN112728925B (en) | High-capacity circulating heating and drying system and heating and drying method thereof | |
| CN201184696Y (en) | Tube type heating stove | |
| CN105609223B (en) | A kind of multifunctional vacuum oil immersion equipment | |
| CN210356576U (en) | Improved VOCs desorption device utilizing high-temperature steam desorption | |
| CN112763912A (en) | Intelligent hydrogen fuel cell test system and control method | |
| CN218131933U (en) | Pressure detection system and pressure detection device for activated coke regeneration tower | |
| CN106180117B (en) | A kind of processing equipment and method of waste | |
| CN105136602B (en) | Activated carbon comprehensive gas adsorption instrument | |
| CN209782661U (en) | Chemical supply system | |
| CN210993631U (en) | Flue gas dehydration and white smoke elimination system | |
| CN106678850A (en) | Desulfurating water waste heat recovering and utilizing system for boiler | |
| CN208871628U (en) | A kind of labyrinth type high-temperature flue gas pyrolysis oven | |
| CN113368920A (en) | Large-scale high low temperature environment simulation test system of two cold sources | |
| CN207793152U (en) | A kind of coke dry quenching furnace flue gas desulphurization unit | |
| CN208547520U (en) | Coke oven smoke detection device | |
| CN220413287U (en) | Methane purifying device | |
| CN110274256A (en) | A kind of nothing alters wind regenerative air preheater | |
| CN206176662U (en) | Novel gas dehumidifying ware | |
| CN114323904B (en) | Gas preheating and additive vaporizing device for combustible gas combustion experiment | |
| CN205580889U (en) | High-temperature endurance test device for environmental corrosion |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |