CN109631503B - Coal moisture control process waste heat utilization method and device - Google Patents
Coal moisture control process waste heat utilization method and device Download PDFInfo
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- CN109631503B CN109631503B CN201811425746.1A CN201811425746A CN109631503B CN 109631503 B CN109631503 B CN 109631503B CN 201811425746 A CN201811425746 A CN 201811425746A CN 109631503 B CN109631503 B CN 109631503B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
- F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
- F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/10—Heating arrangements using tubes or passages containing heated fluids, e.g. acting as radiative elements; Closed-loop systems
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- 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
- F26B25/005—Treatment of dryer exhaust gases
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- 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
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- Solid Fuels And Fuel-Associated Substances (AREA)
- Drying Of Solid Materials (AREA)
- Coke Industry (AREA)
Abstract
The invention discloses a coal moisture control process waste heat utilization method and a device thereof, wherein the method comprises the following steps: 1) carrying out heat exchange on low-pressure steam and wet coal and then carrying out flash evaporation to obtain saturated condensate water; 2) the saturated condensate water obtained in the step 1) is used for further drying and preheating the moisture control coal obtained in the step 1), and the saturated condensate water is vacuumized to-0.035 to-0.06 MPa during drying and preheating; 3) stopping vacuumizing when the temperature of the moisture-adjusted coal is heated to 65-70 ℃; 4) when the temperature of the moisture-adjusted coal rises to 80-90 ℃, continuously vacuumizing, and when the temperature is higher than 94 ℃, stopping vacuumizing to finish drying and preheating of the current batch of moisture-adjusted coal; 5) and (4) circularly repeating the steps 1) to 4) to dry and preheat the next batch of the conditioned coal. The method is characterized in that the device directly introduces the saturated condensate water after moisture adjustment into the intermediate storage bin, and further preheats and dries moisture-adjusted coal in the storage bin, so that the thermal efficiency of the saturated condensate water is greatly improved, and the energy consumption of the coke oven in the coking process is reduced.
Description
Technical Field
The invention relates to a heat recovery technology, in particular to a coal moisture control process waste heat utilization method and a device thereof.
Background
The coal moisture control technology is a drying coking process for drying wet coal to about 6% of moisture, and has the advantages of saving energy, increasing yield, improving coke quality and the like. The coal moisture control technology has three generations, and heating media are heat conduction oil, steam, flue gas and waste gas of a hot blast stove respectively. At present, the domestic operation is more stable in the second generation of steam drying rotary kilns.
The second generation steam rotary kiln generally adopts low-pressure steam generated after dry quenching power generation as a drying heat source, the low-pressure steam with the temperature of 220 ℃ uniformly exchanges heat with wet coal and then is flashed into saturated condensate water, and the saturated condensate water enters a dry quenching water circulation system again after being cooled by a heat exchange system. The following problems exist in the waste heat recovery mode: 1) the heat of the high-temperature saturated condensate water is recycled after being partially recovered by the heat exchanger, and high heat loss exists in the process; 2) the recovered heat is only used for heating clean circulating water or working media with low boiling points to generate electricity, and the significance of the application effect is not obvious.
Disclosure of Invention
The invention aims to provide a method and a device for utilizing the waste heat of a coal moisture control process, which effectively improve the thermal efficiency of saturated condensate water and reduce the energy consumption of a coke oven coking process.
In order to achieve the purpose, the invention adopts the technical scheme that: a coal moisture control process waste heat utilization method comprises the following steps:
1) carrying out heat exchange on low-pressure steam and wet coal and then carrying out flash evaporation to obtain saturated condensate water;
2) the saturated condensate water obtained in the step 1) is used for further drying and preheating the moisture control coal obtained in the step 1), and the saturated condensate water is vacuumized to-0.035 to-0.06 MPa during drying and preheating;
3) stopping vacuumizing when the temperature of the moisture-adjusted coal is heated to 65-70 ℃;
4) when the temperature of the moisture-adjusted coal rises to 80-90 ℃, continuously vacuumizing, and when the temperature is higher than 94 ℃, stopping vacuumizing to finish drying and preheating of the current batch of moisture-adjusted coal;
5) and (4) circularly repeating the steps 1) to 4) to dry and preheat the next batch of the conditioned coal.
Further, in the step 2), vacuumizing to-0.04-0.06 MPa.
Further, in the step 4), when the temperature of the coal to be subjected to humidity adjustment rises to 80-85 ℃, vacuum pumping is continuously performed.
Furthermore, in the step 1), the temperature of saturated condensate water is 120-140 ℃.
A device for realizing the coal moisture control process waste heat utilization method comprises a steam rotary kiln, a flash tank, a moisture control coal intermediate storage bin and an air pump; a condensate water outlet of the steam rotary kiln is connected with a condensate water inlet of the flash tank, a saturated condensate water outlet of the flash tank is connected with a high-temperature heat medium inlet of the moisture-controlled coal intermediate storage bin, and a moisture-controlled coal outlet of the steam rotary kiln is connected with a moisture-controlled coal inlet of the moisture-controlled coal intermediate storage bin; the air pump is connected with a vacuum pumping port of the coal moisture control intermediate storage bin.
Further, be equipped with heating water pipe and temperature sensor in the middle of the humidifying coal storage bin, the heating water pipe is in from last snake-shaped distribution state that down is in the middle of the humidifying coal storage bin, the high temperature heat medium import sets up the heating water pipe head end, the low temperature heat medium export is established to the heating water pipe end.
Furthermore, a water pump and a flow valve are arranged on a pipeline between the saturated condensate water outlet of the flash tank and the high-temperature heat medium inlet of the coal conditioning intermediate storage bin.
Further, a heat exchanger is connected between the saturated condensate water outlet of the flash tank and the high-temperature heat medium inlet of the coal moisture control intermediate storage bin.
Furthermore, a low-temperature heat medium outlet of the humidifying coal intermediate storage bin is connected with a dry quenching water tank.
Compared with the prior art, the invention has the following advantages:
firstly, the method directly introduces the saturated condensate water after humidifying into the intermediate storage bin, further preheats and dries the humidifying coal in the storage bin, greatly improves the thermal efficiency of the saturated condensate water, reduces the energy consumption in the coking process of the coke oven, and provides a more efficient heat recovery method for the saturated condensate water after humidifying.
Secondly, the device introduces the high-temperature condensed water subjected to steam rotary kiln and flash evaporation into the middle storage bin, the storage bin heating water pipe and the temperature sensor are additionally arranged in the hollow storage bin, and the hollow storage bin is connected with the vacuumizing device.
Drawings
FIG. 1 is a schematic structural diagram of a coal moisture control process waste heat utilization system.
Detailed Description
The invention will be described in more detail below with reference to the accompanying drawings, which are included to provide a more clear understanding of the invention, but are not intended to limit the invention.
The waste heat utilization device for the coal moisture control process shown in the figure 1 comprises a steam rotary kiln 1, a flash tank 2, a moisture control coal intermediate storage bin 3 and an air pump 4; a condensed water outlet 1.1 of the steam rotary kiln 1 is connected with a condensed water inlet 2.1 of the flash tank 2, a saturated condensed water outlet 2.2 of the flash tank 2 is connected with a high-temperature heat medium inlet 3.1 of the moisture-controlled coal intermediate storage bin 3, and a moisture-controlled coal outlet 1.2 of the steam rotary kiln 1 is connected with a moisture-controlled coal inlet 3.2 of the moisture-controlled coal intermediate storage bin 3; the air pump 4 is connected with a vacuumizing port 3.6 of the coal moisture control intermediate storage bin 3, and a connecting pipe of the air pump 4 is communicated with the outside.
In the scheme, the humidifying coal intermediate storage bin 3 is internally provided with the heating water pipe 3.3 and the temperature sensor 3.4, the heating water pipe 3.3 is in a snake-shaped distribution state from top to bottom in the humidifying coal intermediate storage bin 3, the high-temperature heat medium inlet 3.1 is arranged at the head end of the heating water pipe 3.3, and the tail end of the heating water pipe 3.3 is provided with the low-temperature heat medium outlet 3.5. A water pump 5 and a flow valve 6 are arranged on a pipeline between a saturated condensate water outlet 2.2 of the flash tank 2 and a high-temperature heat medium inlet 3.1 of the moisture-adjusted coal intermediate storage bin 3. A heat exchanger 7 is connected between a saturated condensate water outlet 2.2 of the flash tank 2 and a high-temperature heat medium inlet 3.1 of the moisture-controlled coal intermediate storage bin 3. A low-temperature heat medium outlet 3.5 of the humidifying coal intermediate storage bin 3 is connected with a dry quenching water tank 8.
The method for utilizing the waste heat of the coal moisture control process comprises the following steps:
1) carrying out heat exchange on low-pressure steam and wet coal, and then carrying out flash evaporation to obtain saturated condensate water, wherein the temperature of the saturated condensate water is 120-140 ℃;
2) the saturated condensate water obtained in the step 1) is used for further drying and preheating the moisture control coal obtained in the step 1), and the saturated condensate water is vacuumized to-0.035 to-0.06 MPa, preferably-0.04 to-0.06 MPa during drying and preheating.
3) Stopping vacuumizing when the temperature of the moisture-adjusted coal is heated to 65-70 ℃;
4) when the temperature of the moisture-adjusted coal rises to 80-90 ℃, preferably 80-85 ℃, continuing to vacuumize, and when the temperature is higher than 94 ℃, stopping vacuuming to finish drying and preheating of the current batch of moisture-adjusted coal;
5) and (4) circularly repeating the steps 1) to 4) to dry and preheat the next batch of the conditioned coal.
The specific operation steps are as follows:
1) starting an air pump 4, and vacuumizing the intermediate storage bin 3, wherein the vacuum degree is 0.05 MPa;
2) opening a flow valve 6 for leading saturated condensate water to an intermediate storage bin 3, starting a water pump 5, introducing the saturated condensate water with the temperature of 140 ℃ after humidifying into a heating water pipe 3.3 of the intermediate storage bin 3, heating the intermediate storage bin 3 filled with the humidifying coal, heating and drying the humidifying coal, and recycling the water after heat exchange in a dry quenching water tank 8, wherein the saturated condensate water is used for heating the humidifying coal, and one part of the saturated condensate water can be used for waste heat recovery in a heat exchanger;
3) when the temperature of the moisture-adjusted coal is heated to 65 ℃, the vacuumizing is stopped;
4) when the temperature of the moisture-adjusted coal rises to 85 ℃, continuing vacuumizing, stopping vacuumizing when the temperature exceeds 94 ℃, and discharging at the bottom;
5) repeating 1) to 4) to dry and preheat the next batch of the conditioned coal.
Claims (6)
1. A coal moisture control process waste heat utilization method is characterized by comprising the following steps: the method comprises the following steps:
1) carrying out heat exchange on low-pressure steam and wet coal and then carrying out flash evaporation to obtain saturated condensate water;
2) the saturated condensate water obtained in the step 1) is used for further drying and preheating the moisture control coal obtained in the step 1), and the moisture control coal is vacuumized to-0.04-0.06 MPa during drying and preheating;
3) stopping vacuumizing when the temperature of the moisture-adjusted coal is heated to 65-70 ℃;
4) when the temperature of the moisture-adjusted coal rises to 80-90 ℃, continuously vacuumizing, and when the temperature is higher than 94 ℃, stopping vacuumizing to finish drying and preheating of the current batch of moisture-adjusted coal;
5) circularly repeating the steps 1) to 4), and drying and preheating the next batch of the humidity-adjusted coal;
in the step 1), the temperature of saturated condensate water is 120-140 ℃.
2. The coal moisture control process waste heat utilization method according to claim 1, characterized in that: and in the step 4), when the temperature of the coal to be subjected to moisture control rises to 80-85 ℃, continuously vacuumizing.
3. A device for realizing the coal moisture control process waste heat utilization method of claim 1 comprises a steam rotary kiln (1), and is characterized in that: the system also comprises a flash tank (2), a moisture-controlled coal intermediate storage bin (3) and an air pump (4); a condensed water outlet (1.1) of the steam rotary kiln (1) is connected with a condensed water inlet (2.1) of the flash tank (2), a saturated condensed water outlet (2.2) of the flash tank (2) is connected with a high-temperature heat medium inlet (3.1) of the humidifying coal intermediate storage bin (3), and a humidifying coal outlet (1.2) of the steam rotary kiln (1) is connected with a humidifying coal inlet (3.2) of the humidifying coal intermediate storage bin (3); the air pump (4) is connected with a vacuum pumping port (3.6) of the humidifying coal intermediate storage bin (3);
be equipped with in storehouse (3) in the middle of the humidifying coal with water pipe (3.3) and temperature sensor (3.4), with water pipe (3.3) be in storehouse (3) in the middle of the humidifying coal from last down be snakelike distribution state, high temperature hot medium import (3.1) set up with water pipe (3.3) head end, low temperature hot medium export (3.5) are established to water pipe (3.3) end.
4. The device for utilizing the waste heat of the coal moisture control process according to claim 3, which is characterized in that: and a water pump (5) and a flow valve (6) are arranged on a pipeline between a saturated condensate water outlet (2.2) of the flash tank (2) and a high-temperature heat medium inlet (3.1) of the humidifying coal intermediate storage bin (3).
5. The device for utilizing the waste heat of the coal moisture control process according to claim 3, which is characterized in that: and a heat exchanger (7) is connected between a saturated condensate water outlet (2.2) of the flash tank (2) and a high-temperature heat medium inlet (3.1) of the humidifying coal intermediate storage bin (3).
6. The device for utilizing the waste heat of the coal moisture control process according to claim 3, which is characterized in that: and a low-temperature heat medium outlet (3.5) of the humidifying coal intermediate storage bin (3) is connected with a dry quenching water tank (8).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811425746.1A CN109631503B (en) | 2018-11-27 | 2018-11-27 | Coal moisture control process waste heat utilization method and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811425746.1A CN109631503B (en) | 2018-11-27 | 2018-11-27 | Coal moisture control process waste heat utilization method and device |
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| CN109631503A CN109631503A (en) | 2019-04-16 |
| CN109631503B true CN109631503B (en) | 2020-11-24 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2485611Y (en) * | 2001-06-23 | 2002-04-10 | 李宗礼 | Drier structure with adjustable temperature and pressure |
| CN101693843A (en) * | 2009-10-27 | 2010-04-14 | 山东天力干燥设备有限公司 | Coal steam rotating moisture control process system and method thereof |
| CN103453752A (en) * | 2013-08-30 | 2013-12-18 | 武汉工程大学 | Low-energy-consumption lignite drying process for recovering lignite moisture and drying equipment |
| CN107514874A (en) * | 2017-08-01 | 2017-12-26 | 山东科院天力节能工程有限公司 | Suitable for the Novel steam rotary drying system of the high viscous material of high humidity |
-
2018
- 2018-11-27 CN CN201811425746.1A patent/CN109631503B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2485611Y (en) * | 2001-06-23 | 2002-04-10 | 李宗礼 | Drier structure with adjustable temperature and pressure |
| CN101693843A (en) * | 2009-10-27 | 2010-04-14 | 山东天力干燥设备有限公司 | Coal steam rotating moisture control process system and method thereof |
| CN103453752A (en) * | 2013-08-30 | 2013-12-18 | 武汉工程大学 | Low-energy-consumption lignite drying process for recovering lignite moisture and drying equipment |
| CN107514874A (en) * | 2017-08-01 | 2017-12-26 | 山东科院天力节能工程有限公司 | Suitable for the Novel steam rotary drying system of the high viscous material of high humidity |
Non-Patent Citations (1)
| Title |
|---|
| "煤调湿技术在国内外发展与应用";李帅俊，李晓光;《干燥技术与设备》;20101231;第8卷(第6期);第249-255页 * |
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| CN109631503A (en) | 2019-04-16 |
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