CN110455044B - Wet coal pre-drying system and method based on complementary energy utilization - Google Patents
Wet coal pre-drying system and method based on complementary energy utilization Download PDFInfo
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- CN110455044B CN110455044B CN201910700829.5A CN201910700829A CN110455044B CN 110455044 B CN110455044 B CN 110455044B CN 201910700829 A CN201910700829 A CN 201910700829A CN 110455044 B CN110455044 B CN 110455044B
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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
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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
- F26B21/005—Drying-steam generating means
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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
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/10—Temperature; Pressure
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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
- F26B25/06—Chambers, containers, or receptacles
- F26B25/08—Parts thereof
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
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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
Abstract
The invention provides a wet coal pre-drying system and method based on waste energy utilization, and the wet coal pre-drying system comprises a first preheating bin, a second preheating bin, a heat source conduction device and a waste heat recovery device, wherein an outlet at the bottom of the second preheating bin is communicated with an inlet at the top of the first preheating bin through a blanking pipe, the heat source conduction device comprises a first heating coil pipe and a second heating coil pipe, a heat source medium enters the first heating coil pipe through a heat source inlet pipe and is discharged from a heat source outlet pipe, a first steam pipe is arranged at the top of the first preheating bin and is connected with the second heating coil pipe, an outlet is connected with the second steam pipe, a third steam pipe is arranged at the top of the second preheating bin, the waste heat recovery device comprises a steam recovery pipe, a steam circulation pipe and a condensate recovery pipe, and steam and condensate water are respectively recovered.
Description
Technical Field
The invention belongs to the technical field of coking, and particularly relates to a wet coal pre-drying system and method based on waste energy utilization.
Background
The coking coal generally contains more than 10 percent of moisture, a large amount of coking wastewater which is difficult to treat is generated when the coking coal is directly put into a furnace for coking, and simultaneously, a large amount of high-quality energy is consumed in the dehydration of the coke furnace. With the increasing environmental protection requirement, the external pre-drying dehydration coking is an effective method with environmental protection and energy saving. At present, pre-drying dehydration at home and abroad mainly focuses on indirect heat exchange between flue gas or steam and wet coal in a rotary kiln, and the process has the disadvantages of large equipment volume, large occupied area, high investment and the like, and has lower energy utilization efficiency.
Disclosure of Invention
The present invention is directed to provide a wet coal pre-drying system and method based on residual energy utilization, which can fully utilize residual energy steam in the drying process.
The technical scheme adopted by the invention for solving the technical problems is as follows: a wet coal pre-drying system based on waste energy utilization is characterized by comprising a first preheating bin, a second preheating bin, a heat source conducting device and a waste heat recovery device, wherein the second preheating bin is arranged above the first preheating bin, an outlet at the bottom of the second preheating bin is communicated with an inlet at the top of the first preheating bin through a blanking pipe, the heat source conducting device comprises a first heating coil and a second heating coil which are respectively arranged in the first preheating bin and the second preheating bin, a heat source medium is connected with an inlet of the first heating coil through a heat source inlet pipe, a heat source outlet pipe is connected with an outlet of the first heating coil, a first steam pipe is arranged at the top of the first preheating bin and is connected with an inlet of the second heating coil, an outlet of the second heating coil is connected with a second steam pipe, a third steam pipe is arranged at the top of the second preheating bin, and the waste heat recovery device comprises a steam recovery pipe, a steam circulation pipe and a condensate water recovery pipe, the steam recovery pipe is respectively communicated with the heat source inlet pipe, the second steam pipe and the third steam pipe, a steam recovery branch pipe is arranged on the steam recovery pipe and is communicated with the first steam pipe, one end of the condensate water recovery pipe is communicated with an inlet of the second heating coil pipe, the other end of the condensate water recovery pipe is respectively communicated with the heat source inlet pipe and the condensate water outlet pipe, one end of the steam circulation pipe is communicated with the top of the first preheating bin, and the other end of the steam circulation pipe is communicated with the second steam pipe; a first steam valve and a steam pump are sequentially arranged on the first steam pipe along the steam conveying direction, and the joint of the steam recovery branch pipe and the first steam pipe is positioned on a pipeline between the steam valve and the steam pump; the second steam pipe and the third steam pipe are respectively provided with a second steam valve and a third steam valve; the steam recovery pipe is provided with a heating device; a condensate collector and a condensate valve are sequentially arranged on the condensate recovery pipe along the liquid flow direction; a fourth steam valve is arranged on the steam circulating pipe; the top inlet and the bottom outlet of the first preheating bin and the second preheating bin are respectively provided with a rotary sealing valve, and the side walls of the bin bottoms are respectively provided with a dust remover; and coal material thermometers are arranged in the middle of the first preheating bin and the second preheating bin, and steam temperature and pressure meters and material level meters are arranged at the tops of the first preheating bin and the second preheating bin.
A wet coal pre-drying method based on waste energy utilization is characterized by comprising the following steps:
s1) conveying wet coal materials in the first preheating bin and the second preheating bin respectively, and monitoring through a material level meter at the top of the bins;
s2) a heat source medium enters a first heating coil pipe through a heat source inlet pipe, the wet coal in the first preheating bin is heated and dried, and a coal thermometer is used for controlling the temperature of the coal, so that the temperature of the coal is maintained at 104-135 ℃;
s3) monitoring the steam pressure in the first preheating bin through a steam temperature and pressure meter, when the steam pressure reaches 0.2-0.3 MPa, sequentially starting a first steam valve and a steam pump, pumping the steam in the first preheating bin into a second preheating bin, predrying the wet coal material in the second preheating bin, enabling the steam to enter the first preheating bin from a steam circulating pipe, mixing with new steam, enabling the steam to enter a second heating coil through a first steam pipe for continuous heating, enabling the condensed water in the second heating coil to enter a condensed water collector through a condensed water pipe, when a heat source medium is steam, starting a condensed water valve, discharging the condensed water through a condensed water outlet pipe, and when the heat source is hot water, starting the condensed water valve, enabling the condensed water to enter the first heating coil through a heat source inlet pipe for heating;
s4) when the temperature of the coal in the second preheating bin is stabilized at 45-60 ℃, closing the fourth steam pipe, opening the second steam valve and the third steam valve, leading out the steam in the second heating coil pipe and at the top of the second preheating bin into a steam recovery pipe, heating the steam by the heating device, and then re-entering the first preheating bin;
s5), after the preheating degree is reached, opening the rotary sealing valve at the bottom of the first preheating bin first, discharging the dried coal, after the discharging is finished, opening the rotary sealing valves at the top of the first preheating bin and the bottom of the second preheating bin, guiding the coal predried by the second preheating bin into the first preheating bin through a blanking pipe for continuous heating and drying, and opening the rotary sealing valve at the top of the second preheating bin to input new wet coal for predrying.
The invention has the beneficial effects that: the wet coal pre-drying system and method based on residual energy utilization are provided, the principle that moisture and heat conductivity of wet coal are good is utilized, steam generated in the drying process is stably controlled, the heating degree of coal is improved, superheated steam is led out after certain conditions are achieved, pre-drying is carried out by utilizing the residual energy of the superheated steam, the use efficiency of steam residual energy is effectively improved, the occupied area is small, the cost is low, and the process is simple.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
For a better understanding of the present invention, reference is made to the following description taken in conjunction with the accompanying drawings and examples.
As shown in figure 1, a wet coal pre-drying system based on waste energy utilization comprises a first preheating bin 1, a second preheating bin 2, a heat source conduction device and a waste heat recovery device, wherein the second preheating bin is arranged above the first preheating bin, an outlet at the bottom of the second preheating bin is communicated with an inlet at the top of the first preheating bin through a blanking pipe 3, the heat source conduction device comprises a first heating coil 4 and a second heating coil 5 which are respectively arranged in the first preheating bin and the second preheating bin, a heat source medium is connected with an inlet of the first heating coil through a heat source inlet pipe 6, a heat source outlet pipe 7 is connected with an outlet of the first heating coil, a first steam pipe 8 is arranged at the top of the first preheating bin and is connected with an inlet of the second heating coil, an outlet of the second heating coil is connected with a second steam pipe 9, a third steam pipe 10 is arranged at the top of the second preheating bin, the waste heat recovery device comprises a steam recycling pipe 11, a steam circulating pipe 12 and a condensate water recovery pipe 13, the steam recovery pipe is respectively communicated with the heat source inlet pipe, the second steam pipe and the third steam pipe, a steam recovery branch pipe 14 is arranged on the steam recovery pipe and is communicated with the first steam pipe, one end of the condensate water recovery pipe is communicated with the inlet of the second heating coil pipe, the other end of the condensate water recovery pipe is respectively communicated with the heat source inlet pipe and the condensate water outlet pipe 15, one end of the steam circulation pipe is communicated with the top of the first preheating bin, and the other end of the steam circulation pipe is communicated with the second steam pipe.
The first steam pipe is sequentially provided with a first steam valve 16 and a steam pump 17 along the steam conveying direction, and the joint of the steam recovery branch pipe and the first steam pipe is positioned on a pipeline between the steam valve and the steam pump.
The second steam pipe and the third steam pipe are respectively provided with a second steam valve 18 and a third steam valve 19, the second steam valve and the third steam valve are opened after the coal in the second preheating bin is preheated and are recovered through a steam recovery pipe, and the fourth steam valve 20 is arranged on the steam circulation pipe and is opened in the normal preheating process, so that the steam is recycled, and the utilization rate is improved.
The steam recovery pipe is provided with a heating device 21 for reheating the recovered steam and putting the reheated steam into the next heating and drying process.
The condensed water recovery pipe is sequentially provided with a condensed water collector 22 and a condensed water valve 23 along the liquid flow direction, collected condensed water is discharged through a condensed water outlet pipe and enters a hot water pipe network when a heat source medium is steam, and when the heat source medium is hot water, the condensed water enters a first heating coil pipe through a heat source inlet pipe and is subjected to a new heating and drying process.
The top inlet and the bottom outlet of the first preheating bin and the second preheating bin are respectively provided with a rotary sealing valve 24, so that coal can be conveniently filled in and discharged out, and the side walls of the bin bottom are respectively provided with a dust remover 25 for cleaning the bin bottom.
The pre-drying method by adopting the system comprises the following steps:
s1) conveying wet coal materials in the first preheating bin and the second preheating bin respectively, and monitoring through a material level meter at the top of the bins;
s2) a heat source medium enters a first heating coil pipe through a heat source inlet pipe, the wet coal in the first preheating bin is heated and dried, and a coal thermometer is used for controlling the temperature of the coal, so that the temperature of the coal is maintained at 104-135 ℃;
s3) monitoring the steam pressure in the first preheating bin through a steam temperature and pressure meter, when the steam pressure reaches 0.2-0.3 MPa, sequentially starting a first steam valve and a steam pump, pumping the steam in the first preheating bin into a second preheating bin, predrying the wet coal material in the second preheating bin, enabling the steam to enter the first preheating bin from a steam circulating pipe, mixing with new steam, enabling the steam to enter a second heating coil through a first steam pipe for continuous heating, enabling the condensed water in the second heating coil to enter a condensed water collector through a condensed water pipe, when a heat source medium is steam, starting a condensed water valve, discharging the condensed water through a condensed water outlet pipe, and when the heat source is hot water, starting the condensed water valve, enabling the condensed water to enter the first heating coil through a heat source inlet pipe for heating;
s4) when the temperature of the coal in the second preheating bin is stabilized within 45-60 ℃, closing the fourth steam pipe, opening the second steam valve and the third steam valve, leading out the steam in the second heating coil pipe and at the top of the second preheating bin into a steam recovery pipe, heating the steam by the heating device, and then re-entering the first preheating bin;
s5), after the preheating degree is reached, opening the rotary sealing valve at the bottom of the first preheating bin first, discharging the dried coal, after the discharging is finished, opening the rotary sealing valves at the top of the first preheating bin and the bottom of the second preheating bin, guiding the coal predried by the second preheating bin into the first preheating bin through a blanking pipe for continuous heating and drying, and opening the rotary sealing valve at the top of the second preheating bin to input new wet coal for predrying.
Claims (2)
1. A wet coal pre-drying system based on waste energy utilization is characterized by comprising a first preheating bin, a second preheating bin, a heat source conducting device and a waste heat recovery device, wherein the second preheating bin is arranged above the first preheating bin, an outlet at the bottom of the second preheating bin is communicated with an inlet at the top of the first preheating bin through a blanking pipe, the heat source conducting device comprises a first heating coil and a second heating coil which are respectively arranged in the first preheating bin and the second preheating bin, a heat source medium is connected with an inlet of the first heating coil through a heat source inlet pipe, a heat source outlet pipe is connected with an outlet of the first heating coil, a first steam pipe is arranged at the top of the first preheating bin and is connected with an inlet of the second heating coil, an outlet of the second heating coil is connected with a second steam pipe, a third steam pipe is arranged at the top of the second preheating bin, and the waste heat recovery device comprises a steam recovery pipe, a steam circulation pipe and a condensate water recovery pipe, the steam recovery pipe is respectively communicated with the heat source inlet pipe, the second steam pipe and the third steam pipe, a steam recovery branch pipe is arranged on the steam recovery pipe and is communicated with the first steam pipe, one end of the condensate water recovery pipe is communicated with an inlet of the second heating coil pipe, the other end of the condensate water recovery pipe is respectively communicated with the heat source inlet pipe and the condensate water outlet pipe, one end of the steam circulation pipe is communicated with the top of the first preheating bin, and the other end of the steam circulation pipe is communicated with the second steam pipe; a first steam valve and a steam pump are sequentially arranged on the first steam pipe along the steam conveying direction, and the joint of the steam recovery branch pipe and the first steam pipe is positioned on a pipeline between the steam valve and the steam pump; the second steam pipe and the third steam pipe are respectively provided with a second steam valve and a third steam valve; the steam recovery pipe is provided with a heating device; a condensate collector and a condensate valve are sequentially arranged on the condensate recovery pipe along the liquid flow direction; a fourth steam valve is arranged on the steam circulating pipe; the top inlet and the bottom outlet of the first preheating bin and the second preheating bin are respectively provided with a rotary sealing valve, and the side walls of the bin bottoms are respectively provided with a dust remover; and coal material thermometers are arranged in the middle of the first preheating bin and the second preheating bin, and steam temperature and pressure meters and material level meters are arranged at the tops of the first preheating bin and the second preheating bin.
2. The wet coal pre-drying method based on the residual energy utilization wet coal pre-drying system is characterized by comprising the following steps of:
s1) conveying wet coal materials in the first preheating bin and the second preheating bin respectively, and monitoring through a material level meter at the top of the bins;
s2) a heat source medium enters a first heating coil pipe through a heat source inlet pipe, the wet coal in the first preheating bin is heated and dried, and a coal thermometer is used for controlling the temperature of the coal, so that the temperature of the coal is maintained at 104-135 ℃;
s3) monitoring the steam pressure in the first preheating bin through a steam temperature and pressure meter, when the steam pressure reaches 0.2-0.3 MPa, sequentially starting a first steam valve and a steam pump, pumping the steam in the first preheating bin into a second preheating bin, predrying the wet coal material in the second preheating bin, enabling the steam to enter the first preheating bin from a steam circulating pipe, mixing with new steam, enabling the steam to enter a second heating coil through a first steam pipe for continuous heating, enabling the condensed water in the second heating coil to enter a condensed water collector through a condensed water pipe, when a heat source medium is steam, starting a condensed water valve, discharging the condensed water through a condensed water outlet pipe, and when the heat source is hot water, starting the condensed water valve, enabling the condensed water to enter the first heating coil through a heat source inlet pipe for heating;
s4) when the temperature of the coal in the second preheating bin is stabilized at 45-60 ℃, closing the fourth steam pipe, opening the second steam valve and the third steam valve, leading out the steam in the second heating coil pipe and at the top of the second preheating bin into a steam recovery pipe, heating the steam by the heating device, and then re-entering the first preheating bin;
s5), after the preheating degree is reached, opening the rotary sealing valve at the bottom of the first preheating bin first, discharging the dried coal, after the discharging is finished, opening the rotary sealing valves at the top of the first preheating bin and the bottom of the second preheating bin, guiding the coal predried by the second preheating bin into the first preheating bin through a blanking pipe for continuous heating and drying, and opening the rotary sealing valve at the top of the second preheating bin to input new wet coal for predrying.
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| CN201910700829.5A CN110455044B (en) | 2019-07-31 | 2019-07-31 | Wet coal pre-drying system and method based on complementary energy utilization |
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| CN201910700829.5A CN110455044B (en) | 2019-07-31 | 2019-07-31 | Wet coal pre-drying system and method based on complementary energy utilization |
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| CN110455044B true CN110455044B (en) | 2021-02-19 |
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| CN111397317A (en) * | 2020-02-24 | 2020-07-10 | 宁波照泰能源设备有限公司 | Disc type dryer |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102494517A (en) * | 2011-12-17 | 2012-06-13 | 无锡亿恩科技股份有限公司 | Cascade staged drying system for brown coal |
| CN103627467A (en) * | 2013-10-21 | 2014-03-12 | 中信重工机械股份有限公司 | Drying, upgrading and forming process of lignite rich in water |
| CN104048479B (en) * | 2014-07-08 | 2016-04-27 | 中国电力工程顾问集团东北电力设计院有限公司 | Based on the two-step fluidized bed brown coal drying system of residual heat recovery |
| CN205537075U (en) * | 2016-01-14 | 2016-08-31 | 江苏搏斯威化工设备工程有限公司 | Hollow blade desiccator heat utilization system |
| JP2017058036A (en) * | 2015-09-14 | 2017-03-23 | 株式会社Ihi | Dehydration system |
| RU182807U1 (en) * | 2017-03-29 | 2018-09-04 | Василий Иванович Мурко | Technological complex for drying coal with a high yield of volatile substances, mainly brown coal |
-
2019
- 2019-07-31 CN CN201910700829.5A patent/CN110455044B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102494517A (en) * | 2011-12-17 | 2012-06-13 | 无锡亿恩科技股份有限公司 | Cascade staged drying system for brown coal |
| CN103627467A (en) * | 2013-10-21 | 2014-03-12 | 中信重工机械股份有限公司 | Drying, upgrading and forming process of lignite rich in water |
| CN104048479B (en) * | 2014-07-08 | 2016-04-27 | 中国电力工程顾问集团东北电力设计院有限公司 | Based on the two-step fluidized bed brown coal drying system of residual heat recovery |
| JP2017058036A (en) * | 2015-09-14 | 2017-03-23 | 株式会社Ihi | Dehydration system |
| CN205537075U (en) * | 2016-01-14 | 2016-08-31 | 江苏搏斯威化工设备工程有限公司 | Hollow blade desiccator heat utilization system |
| RU182807U1 (en) * | 2017-03-29 | 2018-09-04 | Василий Иванович Мурко | Technological complex for drying coal with a high yield of volatile substances, mainly brown coal |
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