CN110903839A - Device and method for controlling moisture of coal entering furnace by using flue gas waste heat - Google Patents
Device and method for controlling moisture of coal entering furnace by using flue gas waste heat Download PDFInfo
- Publication number
- CN110903839A CN110903839A CN201811082256.6A CN201811082256A CN110903839A CN 110903839 A CN110903839 A CN 110903839A CN 201811082256 A CN201811082256 A CN 201811082256A CN 110903839 A CN110903839 A CN 110903839A
- Authority
- CN
- China
- Prior art keywords
- coal
- flue gas
- circulating water
- fluidized bed
- bed type
- 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.)
- Pending
Links
- 239000003245 coal Substances 0.000 title claims abstract description 130
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 107
- 239000003546 flue gas Substances 0.000 title claims abstract description 107
- 238000000034 method Methods 0.000 title claims abstract description 51
- 239000002918 waste heat Substances 0.000 title claims abstract description 27
- 239000000571 coke Substances 0.000 claims abstract description 58
- 239000007789 gas Substances 0.000 claims abstract description 28
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 239000012530 fluid Substances 0.000 claims abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 88
- 238000007599 discharging Methods 0.000 claims description 15
- 238000013016 damping Methods 0.000 claims description 9
- 238000007664 blowing Methods 0.000 claims description 6
- 239000000428 dust Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 239000008187 granular material Substances 0.000 claims 1
- 238000004939 coking Methods 0.000 abstract description 25
- 238000004519 manufacturing process Methods 0.000 abstract description 22
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 239000002699 waste material Substances 0.000 description 5
- 239000002351 wastewater Substances 0.000 description 5
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 3
- 208000028659 discharge Diseases 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/08—Non-mechanical pretreatment of the charge, e.g. desulfurization
- C10B57/10—Drying
-
- 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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Coke Industry (AREA)
Abstract
The invention relates to a device for controlling moisture of coal entering a furnace by using waste heat of flue gas, which comprises: a fluid bed type dehumidifier and a heat exchanger. The method can well utilize the heat of the flue gas discharged from a chimney of the coke oven and can well control the moisture of the coal as fired, thereby effectively improving the bulk density of the coal as fired, improving the quality of the produced coke, reducing the heat consumption in the coking process, simultaneously keeping the heating system of the coke oven stable, being beneficial to the regulation of the temperature of the coke oven and the stability of the production, effectively reducing the production cost and reducing the heat exchange amount of the gas.
Description
Technical Field
The invention belongs to the technical field of coal pretreatment technology for coking production and comprehensive utilization of waste heat in a coking process, and particularly relates to a device and a method for controlling moisture of coal entering a furnace by using waste heat of flue gas.
Background
China has abundant coal resources, and has high dependence proportion on coal in the process of energy utilization. Coal processing has been carried out by coal workers in many ways. The most widely used method is to produce coke (CN1171807A, CN1465656A) by high-temperature dry distillation of coal for blast furnace ironmaking. In addition, because of the shortage of petroleum resources in China, the dependence on foreign countries exceeds more than 40%, in order to relieve the shortage of petroleum, a plurality of researchers develop researches on producing industrial petroleum by coal liquefaction, but the cost of the process is quite huge. In addition, synthesis gas obtained by coal gasification (CN1721511A, CN86105896) is used for preparing methanol or used as reducing gas. There are also some inventions (CN1109911, CN1109510) that use coal gas shaft furnace to produce direct reduced iron.
The molten iron produced by China is more than 8 hundred million tons every year, which has great demand on raw materials for producing coke in ironmaking, and the coke production is still a very important way for utilizing coal resources in China. The production capacity of the existing coke oven in China is the top of the world, the problems of high energy consumption, high pollution and low benefit generally exist in the coking industry, and one of the main reasons for the problems is that the moisture content of coking coal is too high. Wherein, the moisture change not only has influence on the quality and quantity of the coke and the heating system of the coke oven, but also has great influence on the heat consumption of the coking. Taking the coking company of Pingxiang as an example, the energy consumption will increase by 7 kcal per hour when the moisture of the coal entering the furnace increases by 1%. When the water content of the blended coal fluctuates frequently, in order to ensure normal production, a higher standard flame path temperature is used, and the heat consumption of coking is further increased. The water content of the coal charged in China is generally higher, and is about 11% every year, so that the reduction of the water content of the coal blending is more important. The main methods at present are as follows: the coal yard management is enhanced to realize the homogenization of coal materials, and certain effects are achieved by adopting a coal drying process, a coal charging humidifying technology and the like. The Bao steel also adopts a coal moisture control process, but the efficiency of the coal moisture control process is not high due to the adoption of an indirect heat exchange mode of a fixed bed, the energy consumption is extremely high, and meanwhile, the flue gas heated by the coke oven is basically discharged into the atmosphere from a chimney at present, the temperature of the flue gas is more than 200 ℃, so that a great deal of energy is wasted.
Disclosure of Invention
The invention provides a new method for controlling moisture of coal entering a furnace by using waste heat of flue gas, aiming at the problems of low efficiency, high energy consumption and large energy waste caused by the emission of a large amount of flue gas into the air in the prior coal moisture control process, the method can effectively improve the efficiency of the coal moisture control process, reduce the energy consumption, simultaneously effectively utilize the waste of a large amount of heat energy caused by the emission of the flue gas, recycle the energy, facilitate the temperature regulation control and the stability of the heating process of a coke furnace, reduce the heat consumption of coking produced in the coking process, simultaneously improve the use proportion of weak caking coal in the coking process, improve the stacking density of coal charged in the furnace and further improve the quality of the coke, is used for blast furnace iron making, reduce the fuel ratio of the iron-making production process, thereby reducing the production cost of the coking production process and the iron-making production process, meanwhile, the discharge treatment of the coking wastewater can be reduced.
The invention provides a device for controlling moisture of coal entering a furnace by using waste heat of flue gas, which comprises: a fluidized bed type dehumidifier 4 and a heat exchanger 2;
a feeding port 5 is formed in the left side of the top of the fluidized bed type humidity regulator 4 for feeding coal, and a discharging port 6 is formed in the right side of the top of the fluidized bed type humidity regulator for discharging coal;
a first air inlet 8 is formed in the left side of the bottom of the fluidized bed type humidity regulator 4, a second air inlet 10 is formed in the middle of the bottom of the fluidized bed type humidity regulator 4, a third air inlet 11 is formed in the right side of the bottom of the fluidized bed type humidity regulator 4, a first air outlet 9 is formed in the position, opposite to the first air inlet 8, of the left side of the top of the fluidized bed type humidity regulator 4, and the first air outlet 9 is connected with the second air inlet 10 through a gas pipeline; air enters the fluidized bed type damping machine 4 from the first air inlet 8 through the fan 13, is exhausted from the first air outlet 9 after the coal is fluidized, and then enters the fluidized bed type damping machine 4 again from the second air inlet 10 through the gas pipeline; meanwhile, air is introduced from the third air inlet 11 through the fan 13, and the air entering from the second air inlet 10 and the third air inlet 11 is discharged from the second air outlet 7 arranged on the right side of the top of the fluidized bed type moisture-control machine 4 after the coal is fluidized; the fluidized bed type humidity regulator 4 is also internally provided with a circulating water pipeline;
a flue gas pipeline and a circulating water pipeline are arranged in the heat exchanger 2;
an outlet of a circulating water pipeline of the fluidized bed type dehumidifier 4 is connected with an inlet of a circulating water pipeline in the heat exchanger 2, and an inlet of the circulating water pipeline of the fluidized bed type dehumidifier 4 is connected with an outlet of the circulating water pipeline in the heat exchanger 2;
the flue gas pipeline of the heat exchanger 2 is connected with the coke oven chimney 1, the flue gas discharged from the coke oven chimney 1 is subjected to heat exchange with circulating water in the heat exchanger 2 through the flue gas pipeline of the heat exchanger 2, the circulating water is heated up, the flue gas is cooled, and the cooled flue gas returns to the coke oven chimney through the induced draft fan 3.
In the invention, one side of a feeding port for feeding coal is set as the left side, and the other side is set as the right side.
Preferably, the device for controlling moisture of coal as fired by using waste heat of flue gas further comprises a circulating water pump 12, and when the amount of circulating water in the device is insufficient, the water amount is supplemented by the circulating water pump 12.
The invention also provides a method for controlling moisture of coal entering a furnace by using the device and utilizing the waste heat of the flue gas, which comprises the following steps:
(1) coal is charged through a feeding port 5 of a fluidized bed type moisture regulator 4;
(2) blowing air into the fluidized bed type humidity regulator 4 from the first air inlet 8 through the fan 13, discharging the air from the first air outlet 9 after the coal is fluidized, and then re-entering the fluidized bed type humidity regulator 4 from the second air inlet 10 through a gas pipeline; meanwhile, air is introduced from the third air inlet 11 through the fan 13, and the air entering from the second air inlet 10 and the third air inlet 11 fluidizes the coal and then is discharged from the second air outlet 7;
(3) the flue gas discharged from the coke oven chimney 1 is subjected to heat exchange with circulating water in the heat exchanger 2 through a flue gas pipeline of the heat exchanger 2, the flue gas is cooled, and the cooled flue gas returns to the coke oven chimney through an induced draft fan 3; heating up circulating water, feeding the heated circulating water into a circulating water pipeline of a fluidized bed type moisture regulator 4, reducing the moisture content of coal through heat exchange with the coal, and feeding the cooled circulating water into a heat exchanger 2 to exchange heat with flue gas;
(4) the coal is discharged from the discharge port 6.
Preferably, the coal of step (1) has a moisture content Wad10-12% of ash AdThe content of the active ingredients is 7 to 12 percent,volatile component VdThe content is 25-28%, and 80-84% of the particles have a size less than 3 mm;
preferably, the coal charging speed in the step (1) is 360-380 t/h;
preferably, the flow rate of the air blown into the fluidized bed type humidity conditioner 4 from the first air inlet 8 in the step (2) is 150000-160000m3H; the flow rate of air blown into the fluidized-bed type humidity controller 4 from the third air inlet 10 is 180000-190000m3/h；
Preferably, the gas discharged from the second gas outlet 7 in the step (2) is further treated by a cyclone dust collector and then discharged;
preferably, the temperature of the flue gas discharged from the coke oven chimney 1 in the step (3) is 220-3H; after heat exchange with circulating water in the heat exchanger 2, the temperature of the flue gas flowing out of the heat exchanger 2 is 100-; the temperature of the circulating water entering the heat exchanger 2 is 80-90 ℃, and the temperature of the circulating water entering the fluidized bed type humidity regulator 4 from the heat exchanger 2 is 140-145 ℃ after the heat exchange with the flue gas is carried out.
The moisture content of the coal discharged after the treatment by the method is 7-7.5%.
The invention aims at solving the problems of low heat transfer efficiency, high energy consumption, large energy waste caused by the large emission of coke oven flue gas into air and the difficulty in processing coking wastewater generated by coke production in an indirect heat transfer mode adopted by the existing coal humidifying process, and provides a method for controlling moisture of coal entering a furnace by using the waste heat of coke oven flue gas, so as to improve the humidifying efficiency of the coal humidifying process, ensure the stability of the moisture of the coal entering the furnace, improve the stacking density of coal charged into the furnace, effectively utilize the waste of a large amount of heat energy caused by the emission of the flue gas, recycle energy, facilitate the temperature regulation control and stability of the coke oven heating process, reduce the coking heat consumption in the coking process, simultaneously improve the use proportion of weakly caking coal in the coking process, improve the stacking density of the coal charged into the furnace and further improve the quality of the coke, the method is used for blast furnace ironmaking, and the fuel ratio in the ironmaking production process is reduced, so that the production cost in the coking production process and the ironmaking production process is reduced, and meanwhile, the aim of discharge treatment of coking wastewater can be reduced.
The novel method for controlling the moisture of the coal as fired by utilizing the waste heat of the flue gas can well utilize the heat of the flue gas discharged from a chimney of the coke oven and can well control the moisture of the coal as fired, thereby effectively improving the stacking density of the coal as fired, improving the quality of the produced coke, reducing the heat consumption in the coking process, simultaneously keeping the heating system of the coke oven stable, being beneficial to the regulation of the temperature of the coke oven and the stability of the production, effectively reducing the production cost and reducing the heat exchange amount of the gas.
Advantageous effects
Through technical innovation, the novel method for controlling the moisture of the coal entering the furnace by utilizing the waste heat of the flue gas has the following effects:
1. the novel method for controlling the moisture of the coal as fired by using the waste heat of the flue gas can effectively utilize the flue gas of the coke oven discharged from a chimney of the coke oven and avoid the waste of energy caused by directly discharging the flue gas of the coke oven into the atmosphere.
2. By the novel method for controlling the moisture of the coal as fired by utilizing the waste heat of the flue gas, the moisture of the coal as fired can be effectively controlled, so that the heat consumption required in the coking process can be reduced, and meanwhile, the stacking density of the coal as fired can be improved, and the yield can be improved.
3. By using the new method for controlling the moisture of the coal fed into the furnace by using the waste heat of the flue gas, the coking wastewater produced in the coking production process can be reduced, thereby reducing the treatment cost of the wastewater.
4. The method can ensure the stability of the moisture of the coal entering the coke oven by using the flue gas waste heat to control the moisture of the coal entering the coke oven, thereby ensuring the stability of the heating process of the coke oven, improving the quality of the produced coke and ensuring the effective smooth operation of the coking production process.
5. The new method for controlling the moisture of the coal entering the furnace by utilizing the waste heat of the flue gas can reduce the production cost in the coking production process, and the coke is used for the blast furnace, so that the fuel ratio of the blast furnace can be effectively reduced, and the production cost of the blast furnace is reduced.
Drawings
FIG. 1 is a schematic view of the device and process for controlling moisture of coal fed into a furnace by using waste heat of flue gas. Wherein: 1-coke oven chimney; 2-a heat exchanger; 3-a draught fan; 4-a fluidized bed type humidity conditioner; 5-a feeding port; 6-discharging port; 7-a second air outlet; 8-a first inlet; 9-a first air outlet; 10-a second inlet; 11-a third inlet; 12-a circulating water pump; 13-a fan.
Detailed Description
Example 1
As shown in fig. 1, a device for controlling moisture of coal entering a furnace by using waste heat of flue gas comprises: a fluidized bed type dehumidifier 4 and a heat exchanger 2;
a feeding port 5 is formed in the left side of the top of the fluidized bed type humidity regulator 4 for feeding coal, and a discharging port 6 is formed in the right side of the top of the fluidized bed type humidity regulator for discharging coal;
a first air inlet 8 is formed in the left side of the bottom of the fluidized bed type humidity regulator 4, a second air inlet 10 is formed in the middle of the bottom of the fluidized bed type humidity regulator 4, a third air inlet 11 is formed in the right side of the bottom of the fluidized bed type humidity regulator 4, a first air outlet 9 is formed in the position, opposite to the first air inlet 8, of the left side of the top of the fluidized bed type humidity regulator 4, and the first air outlet 9 is connected with the second air inlet 10 through a gas pipeline; air enters the fluidized bed type damping machine 4 from the first air inlet 8 through the fan 13, is exhausted from the first air outlet 9 after the coal is fluidized, and then enters the fluidized bed type damping machine 4 again from the second air inlet 10 through the gas pipeline; meanwhile, air is introduced from the third air inlet 11 through the fan 13, and the air entering from the second air inlet 10 and the third air inlet 11 is discharged from the second air outlet 7 arranged on the right side of the top of the fluidized bed type moisture-control machine 4 after the coal is fluidized; the fluidized bed type humidity regulator 4 is also internally provided with a circulating water pipeline;
a flue gas pipeline and a circulating water pipeline are arranged in the heat exchanger 2;
an outlet of a circulating water pipeline of the fluidized bed type dehumidifier 4 is connected with an inlet of a circulating water pipeline in the heat exchanger 2, and an inlet of the circulating water pipeline of the fluidized bed type dehumidifier 4 is connected with an outlet of the circulating water pipeline in the heat exchanger 2;
the flue gas pipeline of the heat exchanger 2 is connected with the coke oven chimney 1, the flue gas discharged from the coke oven chimney 1 is subjected to heat exchange with circulating water in the heat exchanger 2 through the flue gas pipeline of the heat exchanger 2, the circulating water is heated up, the flue gas is cooled, and the cooled flue gas returns to the coke oven chimney through the induced draft fan 3.
The device for controlling the moisture of the coal as fired by using the waste heat of the flue gas also comprises a circulating water pump 12, and when the circulating water in the device is insufficient, the water is supplemented by the circulating water pump 12.
Example 2
By using the device in embodiment 1, a method for controlling moisture of coal entering a furnace by using waste heat of flue gas comprises the following steps:
(1) coal is charged through a feeding port 5 of a fluidized bed type moisture regulator 4;
(2) blowing air into the fluidized bed type humidity regulator 4 from the first air inlet 8 through the fan 13, discharging the air from the first air outlet 9 after the coal is fluidized, and then re-entering the fluidized bed type humidity regulator 4 from the second air inlet 10 through a gas pipeline; meanwhile, air is introduced from the third air inlet 11 through the fan 13, and the air entering from the second air inlet 10 and the third air inlet 11 fluidizes the coal and then is discharged from the second air outlet 7; the gas discharged from the second gas outlet 7 is further treated by a cyclone dust collector and then discharged;
(3) the flue gas discharged from the coke oven chimney 1 is subjected to heat exchange with circulating water in the heat exchanger 2 through a flue gas pipeline of the heat exchanger 2, the flue gas is cooled, and the cooled flue gas returns to the coke oven chimney through an induced draft fan 3; heating up circulating water, feeding the heated circulating water into a circulating water pipeline of a fluidized bed type moisture regulator 4, reducing the moisture content of coal through heat exchange with the coal, and feeding the cooled circulating water into a heat exchanger 2 to exchange heat with flue gas;
(4) the coal is discharged from the discharge port 6.
Wherein,
moisture content W of the coal of step (1)ad12% of ash A d12% of volatile matter VdThe content is 28 percent, and 84 percent of the particle size is less than 3 mm; the coal charging speed is 380 t/h;
in the step (2), the flow rate of air blown into the fluidized bed type humidity conditioner 4 through the first air inlet 8 is 160000m3H; the flow rate of air blown into the fluidized-bed humidifier 4 through the third air inlet 10 was 190000m3/h；
The temperature of the flue gas discharged from the coke oven chimney 1 in the step (3) is 240 ℃, and the flow rate of the flue gas is 460000m3H; after heat exchange with circulating water in the heat exchanger 2, the temperature of the flue gas flowing out of the heat exchanger 2 is 110 ℃; the temperature of the circulating water entering the heat exchanger 2 is 90 ℃, and the temperature of the circulating water entering the fluidized bed type humidity regulator 4 from the heat exchanger 2 is 145 ℃ after the heat exchange with the flue gas is carried out.
The moisture content of the coal discharged after the treatment by the method in this example was 7.5%.
Example 3
By using the device in embodiment 1, a method for controlling moisture of coal entering a furnace by using waste heat of flue gas comprises the following steps:
(1) coal is charged through a feeding port 5 of a fluidized bed type moisture regulator 4;
(2) blowing air into the fluidized bed type humidity regulator 4 from the first air inlet 8 through the fan 13, discharging the air from the first air outlet 9 after the coal is fluidized, and then re-entering the fluidized bed type humidity regulator 4 from the second air inlet 10 through a gas pipeline; meanwhile, air is introduced from the third air inlet 11 through the fan 13, and the air entering from the second air inlet 10 and the third air inlet 11 fluidizes the coal and then is discharged from the second air outlet 7; the gas discharged from the second gas outlet 7 is further treated by a cyclone dust collector and then discharged;
(3) the flue gas discharged from the coke oven chimney 1 is subjected to heat exchange with circulating water in the heat exchanger 2 through a flue gas pipeline of the heat exchanger 2, the flue gas is cooled, and the cooled flue gas returns to the coke oven chimney through an induced draft fan 3; heating up circulating water, feeding the heated circulating water into a circulating water pipeline of a fluidized bed type moisture regulator 4, reducing the moisture content of coal through heat exchange with the coal, and feeding the cooled circulating water into a heat exchanger 2 to exchange heat with flue gas;
(4) the coal is discharged from the discharge port 6.
Wherein,
moisture content W of the coal of step (1)ad11% of ash Ad10% of volatile matter VdThe content is 27 percent, and 82 percent of the particle size is less than 3 mm; the coal charging speed is 375 t/h;
in the step (2), the flow rate of air blown into the fluidized bed type humidity conditioner 4 through the first air inlet 8 is 160000m3H; the flow rate of air blown into the fluidized-bed humidifier 4 through the third air inlet 10 was 180000m3/h；
The temperature of the flue gas discharged from the coke oven chimney 1 in the step (3) is 230 ℃, and the flow rate of the flue gas is 470000m3H; after heat exchange with circulating water in the heat exchanger 2, the temperature of the flue gas flowing out of the heat exchanger 2 is 105 ℃; the temperature of the circulating water entering the heat exchanger 2 is 85 ℃, and the temperature of the circulating water entering the fluidized bed type humidity regulator 4 from the heat exchanger 2 is 143 ℃ after the heat exchange with the flue gas is carried out.
The moisture content of the coal discharged after the treatment by the method in this example was 7.3%.
Example 4
By using the device in embodiment 1, a method for controlling moisture of coal entering a furnace by using waste heat of flue gas comprises the following steps:
(1) coal is charged through a feeding port 5 of a fluidized bed type moisture regulator 4;
(2) blowing air into the fluidized bed type humidity regulator 4 from the first air inlet 8 through the fan 13, discharging the air from the first air outlet 9 after the coal is fluidized, and then re-entering the fluidized bed type humidity regulator 4 from the second air inlet 10 through a gas pipeline; meanwhile, air is introduced from the third air inlet 11 through the fan 13, and the air entering from the second air inlet 10 and the third air inlet 11 fluidizes the coal and then is discharged from the second air outlet 7; the gas discharged from the second gas outlet 7 is further treated by a cyclone dust collector and then discharged;
(3) the flue gas discharged from the coke oven chimney 1 is subjected to heat exchange with circulating water in the heat exchanger 2 through a flue gas pipeline of the heat exchanger 2, the flue gas is cooled, and the cooled flue gas returns to the coke oven chimney through an induced draft fan 3; heating up circulating water, feeding the heated circulating water into a circulating water pipeline of a fluidized bed type moisture regulator 4, reducing the moisture content of coal through heat exchange with the coal, and feeding the cooled circulating water into a heat exchanger 2 to exchange heat with flue gas;
(4) the coal is discharged from the discharge port 6.
Wherein,
step (ii) of(1) Moisture content W of the coalad10% of ash content A d9% of volatile component VdThe content is 26 percent, and 81 percent of the particle size is less than 3 mm; the coal charging speed is 365 t/h;
in the step (2), the flow rate of air blown into the fluidized bed type humidity conditioner 4 through the first air inlet 8 was 150000m3H; the flow rate of air blown into the fluidized-bed humidifier 4 through the third air inlet 10 was 190000m3/h；
The temperature of the flue gas discharged from the coke oven chimney 1 in the step (3) is 220 ℃, and the flow rate of the flue gas is 470000m3H; after heat exchange with circulating water in the heat exchanger 2, the temperature of the flue gas flowing out of the heat exchanger 2 is 105 ℃; the temperature of the circulating water entering the heat exchanger 2 is 80 ℃, and the temperature of the circulating water entering the fluidized bed type humidity regulator 4 from the heat exchanger 2 is 142 ℃ after the heat exchange with the flue gas is carried out.
The moisture content of the coal discharged after the treatment by the method in this example was 7.2%.
Example 5
By using the device in embodiment 1, a method for controlling moisture of coal entering a furnace by using waste heat of flue gas comprises the following steps:
(1) coal is charged through a feeding port 5 of a fluidized bed type moisture regulator 4;
(2) blowing air into the fluidized bed type humidity regulator 4 from the first air inlet 8 through the fan 13, discharging the air from the first air outlet 9 after the coal is fluidized, and then re-entering the fluidized bed type humidity regulator 4 from the second air inlet 10 through a gas pipeline; meanwhile, air is introduced from the third air inlet 11 through the fan 13, and the air entering from the second air inlet 10 and the third air inlet 11 fluidizes the coal and then is discharged from the second air outlet 7; the gas discharged from the second gas outlet 7 is further treated by a cyclone dust collector and then discharged;
(3) the flue gas discharged from the coke oven chimney 1 is subjected to heat exchange with circulating water in the heat exchanger 2 through a flue gas pipeline of the heat exchanger 2, the flue gas is cooled, and the cooled flue gas returns to the coke oven chimney through an induced draft fan 3; heating up circulating water, feeding the heated circulating water into a circulating water pipeline of a fluidized bed type moisture regulator 4, reducing the moisture content of coal through heat exchange with the coal, and feeding the cooled circulating water into a heat exchanger 2 to exchange heat with flue gas;
(4) the coal is discharged from the discharge port 6.
Wherein,
moisture content W of the coal of step (1)ad10% of ash content AdContent of 7% volatile component VdThe content is 25 percent, and 80 percent of the particle size is less than 3 mm; the coal charging speed is 360 t/h;
in the step (2), the flow rate of air blown into the fluidized bed type humidity conditioner 4 through the first air inlet 8 was 150000m3H; the flow rate of air blown into the fluidized-bed humidifier 4 through the third air inlet 10 was 180000m3/h；
The temperature of the flue gas discharged from the coke oven chimney 1 in the step (3) is 220 ℃, and the flow rate of the flue gas is 460000m3H; after heat exchange with circulating water in the heat exchanger 2, the temperature of the flue gas flowing out of the heat exchanger 2 is 100 ℃; the temperature of the circulating water entering the heat exchanger 2 is 80 ℃, and the temperature of the circulating water entering the fluidized bed type humidity regulator 4 from the heat exchanger 2 is 140 ℃ after the heat exchange with the flue gas is carried out.
The moisture content of the coal discharged after the treatment by the method in this example was 7%.
Claims (8)
1. The utility model provides a device for utilize flue gas waste heat control income stove coal moisture, includes: fluid bed humidifiers and heat exchangers; the method is characterized in that:
the left side of the top of the fluidized bed type humidity regulator is provided with a feed inlet for feeding coal, and the right side of the top of the fluidized bed type humidity regulator is provided with a discharge outlet for discharging coal;
a first air inlet is formed in the left side of the bottom of the fluidized bed type humidity regulator, a second air inlet is formed in the middle of the bottom of the fluidized bed type humidity regulator, a third air inlet is formed in the right side of the bottom of the fluidized bed type humidity regulator, a first air outlet is formed in the position, opposite to the first air inlet, of the left side of the top of the fluidized bed type humidity regulator, and the first air outlet is connected with the second air inlet through a gas pipeline; air enters the fluidized bed type damping machine from the first air inlet through the fan, is discharged from the first air outlet after the coal is fluidized, and then enters the fluidized bed type damping machine again from the second air inlet through the gas pipeline; meanwhile, air is introduced from the third air inlet through the fan, and the air entering from the second air inlet and the third air inlet is discharged from a second air outlet arranged on the right side of the top of the fluidized bed type humidity conditioner after the coal is fluidized; the fluidized bed type humidity regulator is also internally provided with a circulating water pipeline;
a flue gas pipeline and a circulating water pipeline are arranged in the heat exchanger;
the outlet of the circulating water pipeline of the fluidized bed type moisture regulator is connected with the inlet of the circulating water pipeline in the heat exchanger, and the inlet of the circulating water pipeline of the fluidized bed type moisture regulator is connected with the outlet of the circulating water pipeline in the heat exchanger;
the flue gas pipeline of the heat exchanger is connected with the coke oven chimney, the flue gas discharged from the coke oven chimney is subjected to heat exchange with circulating water in the heat exchanger through the flue gas pipeline of the heat exchanger, the circulating water is heated, the flue gas is cooled, and the cooled flue gas returns to the coke oven chimney through the induced draft fan.
2. The device for controlling moisture of coal as fired by using waste heat of flue gas as claimed in claim 1, wherein: the device for controlling the moisture of the coal as fired by using the waste heat of the flue gas also comprises a circulating water pump, and when the circulating water quantity in the device is insufficient, the water quantity is supplemented by the circulating water pump.
3. A method for controlling moisture of coal fed into a furnace by using the residual heat of flue gas by using the device of claim 1 or 2, which is characterized by comprising the following steps:
(1) coal is charged through a feeding port of a fluidized bed type damping machine;
(2) blowing air into the fluidized bed type damping machine from the first air inlet through a fan, discharging the air from the first air outlet after the coal is fluidized, and then re-entering the fluidized bed type damping machine from the second air inlet through a gas pipeline; meanwhile, air is introduced from the third air inlet through the fan, and the air entering the second air inlet and the third air inlet fluidizes the coal and then is discharged from the second air outlet;
(3) the flue gas discharged from the coke oven chimney is subjected to heat exchange with circulating water in the heat exchanger through a flue gas pipeline of the heat exchanger, the flue gas is cooled, and the cooled flue gas returns to the coke oven chimney through an induced draft fan; heating circulating water, feeding the heated circulating water into a circulating water pipeline of a fluidized bed type humidity regulator, reducing the moisture content of coal through heat exchange with the coal, and feeding the cooled circulating water into a heat exchanger to exchange heat with flue gas;
(4) discharging the coal from the discharge port.
4. The method of claim 3, wherein: moisture content W of the coal of step (1)ad10-12% of ash AdContent of 7-12%, volatile component VdThe content is 25-28%, and 80-84% of the granules have a particle size of less than 3 mm.
5. The method of claim 3, wherein: the coal charging speed in the step (1) is 360-380 t/h.
6. The method of claim 3, wherein: the flow rate of air blown into the fluidized bed type humidity conditioner from the first air inlet in the step (2) is 150000-3H; the flow rate of air blown into the fluidized bed type humidity conditioner from the third air inlet is 180000-190000m3/h。
7. The method of claim 3, wherein: and (3) further treating the gas discharged from the second gas outlet in the step (2) by using a cyclone dust collector and then discharging.
8. The method of claim 3, wherein: the temperature of the flue gas discharged from the chimney of the coke oven in the step (3) is 220-3H; after heat exchange with circulating water in the heat exchanger, the temperature of the flue gas flowing out of the heat exchanger is 100-; the temperature of the circulating water entering the heat exchanger is 80-90 ℃, and the temperature of the circulating water entering the fluidized bed type humidity regulator from the heat exchanger is 140-145 ℃ after the heat exchange with the flue gas is carried out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811082256.6A CN110903839A (en) | 2018-09-17 | 2018-09-17 | Device and method for controlling moisture of coal entering furnace by using flue gas waste heat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811082256.6A CN110903839A (en) | 2018-09-17 | 2018-09-17 | Device and method for controlling moisture of coal entering furnace by using flue gas waste heat |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110903839A true CN110903839A (en) | 2020-03-24 |
Family
ID=69813718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811082256.6A Pending CN110903839A (en) | 2018-09-17 | 2018-09-17 | Device and method for controlling moisture of coal entering furnace by using flue gas waste heat |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110903839A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4318779A (en) * | 1979-05-14 | 1982-03-09 | Sumikin Coke Company Ltd. | Method of manufacture of blast furnace cokes containing substantial amounts of low grade coals |
| JP2002309267A (en) * | 2001-04-17 | 2002-10-23 | Nippon Steel Corp | Pretreatment method for coal |
| CN101191058A (en) * | 2007-11-20 | 2008-06-04 | 济南钢铁股份有限公司 | Automatic control method for air current classifying and conditioning technique of coal |
| JP4691063B2 (en) * | 2007-04-19 | 2011-06-01 | 新日本製鐵株式会社 | Fluidized bed drying classifier |
| CN202179916U (en) * | 2011-06-30 | 2012-04-04 | 宝山钢铁股份有限公司 | Dust-removing and ash-discharging system for coal moisture control |
| CN102492447A (en) * | 2011-12-17 | 2012-06-13 | 无锡亿恩科技股份有限公司 | Coking coal damping process for internal-heating type forced heat transferring fluidized bed |
| CN202337761U (en) * | 2011-12-17 | 2012-07-18 | 无锡亿恩科技股份有限公司 | Coking coal humidity adjustment system of energy-saving fluidized bed |
| CN103528342A (en) * | 2013-08-05 | 2014-01-22 | 神华集团有限责任公司 | Coal slime drying system and coal slime drying process |
| CN105647557A (en) * | 2016-03-16 | 2016-06-08 | 无锡亿恩科技股份有限公司 | Device for coking coal stage drying step humidify regulating process |
-
2018
- 2018-09-17 CN CN201811082256.6A patent/CN110903839A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4318779A (en) * | 1979-05-14 | 1982-03-09 | Sumikin Coke Company Ltd. | Method of manufacture of blast furnace cokes containing substantial amounts of low grade coals |
| JP2002309267A (en) * | 2001-04-17 | 2002-10-23 | Nippon Steel Corp | Pretreatment method for coal |
| JP4691063B2 (en) * | 2007-04-19 | 2011-06-01 | 新日本製鐵株式会社 | Fluidized bed drying classifier |
| CN101191058A (en) * | 2007-11-20 | 2008-06-04 | 济南钢铁股份有限公司 | Automatic control method for air current classifying and conditioning technique of coal |
| CN202179916U (en) * | 2011-06-30 | 2012-04-04 | 宝山钢铁股份有限公司 | Dust-removing and ash-discharging system for coal moisture control |
| CN102492447A (en) * | 2011-12-17 | 2012-06-13 | 无锡亿恩科技股份有限公司 | Coking coal damping process for internal-heating type forced heat transferring fluidized bed |
| CN202337761U (en) * | 2011-12-17 | 2012-07-18 | 无锡亿恩科技股份有限公司 | Coking coal humidity adjustment system of energy-saving fluidized bed |
| CN103528342A (en) * | 2013-08-05 | 2014-01-22 | 神华集团有限责任公司 | Coal slime drying system and coal slime drying process |
| CN105647557A (en) * | 2016-03-16 | 2016-06-08 | 无锡亿恩科技股份有限公司 | Device for coking coal stage drying step humidify regulating process |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100577775C (en) | Coal gasification device of circulating fluidized bed and method for generating coal gas by using coal gasification device | |
| CN102251100B (en) | Method for sintering vanadium-titanium magnetite concentrate at high negative pressure and high air quantity | |
| CN102258923A (en) | Method for recycling and reusing tail gas of calcium carbide furnace | |
| CN101289621B (en) | Process for preparing carbocoal, coke tar and coal gas by treating bovey coal by suspending pyrogenation device | |
| CN103925605A (en) | High-moisture lignite medium-speed coal mill pulverizing system heating primary air through pulverized coal burning | |
| WO2024174428A1 (en) | System and method for increasing substitution rate of fossil fuels in cement industry | |
| CN203771439U (en) | High-moisture lignite medium speed mill coal pulverizing system using pulverized coal combustion heating primary air | |
| CN201046952Y (en) | Coal gasification device of circulating fluidized bed | |
| CN108676947A (en) | Method for determining granularity of mixed pulverized coal for blast furnace injection | |
| CN203964358U (en) | A kind of floated cavings hot-blast stove | |
| CN102585867B (en) | System for conditioning through coking charge coal humidity difference | |
| CN102679371B (en) | Sludge drying and incineration device and method | |
| CN210399936U (en) | Clean sintering system based on fuel preparation and roasting control | |
| CN102079982B (en) | Production method of formed coke | |
| CN210215418U (en) | Shaft furnace direct reduced iron device suitable for gas base and coal base | |
| CN102418920A (en) | Circulating fluidized bed power generating boiler capable of blended combustion of industrial waste residues | |
| CN106500496A (en) | A kind of system and method for utilization high-temperature semi-coke | |
| CN110903839A (en) | Device and method for controlling moisture of coal entering furnace by using flue gas waste heat | |
| CN202392781U (en) | Power generating boiler of circulating fluidized bed for co-combustion of industrial waste residue | |
| CN113375434A (en) | Deep waste heat recovery hot air grain drying system | |
| CN206281323U (en) | A kind of system of utilization high-temperature semi-coke | |
| CN102827992A (en) | Converter flue gas energy recovery method | |
| CN106520148B (en) | Water-gas preparation system based on Dry Quenching | |
| CN1743465A (en) | Sack dust adding method for blast furnace coal injection | |
| CN110205165A (en) | A kind of combination cot gasification system and method |
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 | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200324 |