CN104913652A - Shaft furnace pellet clinker waste heat recycling method and device - Google Patents
Shaft furnace pellet clinker waste heat recycling method and device Download PDFInfo
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- CN104913652A CN104913652A CN201510260232.5A CN201510260232A CN104913652A CN 104913652 A CN104913652 A CN 104913652A CN 201510260232 A CN201510260232 A CN 201510260232A CN 104913652 A CN104913652 A CN 104913652A
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Abstract
The invention discloses a shaft furnace pellet clinker waste heat recycling method and device. The temperature of pellet clinkers coming from a shaft furnace exceeds 550 DEG C, then the clinkers are conveyed to a clinker bin through a chain-slat conveyer and a belt cooler, and in this process, pellets dissipate heat outwards in a radiation mode. The pellet clinker waste heat can heat cooling air of the belt cooler through sealing of the chain-slat conveyer and the belt cooler, then hot air is subjected to dedusting processing through a dust remover and then is distributed by a pipeline, and a part of hot air is used for the shaft furnace and a drying kiln to support combustion of air, so that the temperature of combustion-supporting air of the shaft furnace and the drying kiln is improved and gas is saved; another part of hot air is used for predrying wet pellets on a discharging belt of the shaft furnace, and the gas consumption is reduced; the left air is used for the shaft furnace to cool air. The shaft furnace pellet clinker waste heat recycling method and device is obvious in energy conservation effect, small in operation and maintenance workload, low in operation cost, high in economic benefit and capable of reducing the enterprise cost and reducing environment pollution.
Description
Technical field
The present invention relates to a kind of method of waste heat recovery, particularly relate to the method for a kind of Shaft Furnace Pelletizing Process grog waste heat recovery.
Background technology
In iron and steel enterprise, the energy consumption of sintering work is only second to ironmaking.Sinter cooler exhaust heat accounts for 25% ~ 30% of sintering plant total energy consumption, is the energy-conservation important ring of sintering work to the recovery of waste gas residual heat.
Current heat recovery technology mainly contains: 1. separate heat pipe heat recovery technology; 2. integrated thermal heat recovery technology.The design of waste heat recovery and the difference of mode, can bring diverse benefit.General heat recovery mode has: 1. mounting heat exchanger; 2. waste heat boiler is installed.
Sintering process waste heat recovery effect is bad, and mainly the sensible heat of flue gas and hot blast fails effectively to preserve, and the reason of high fume temperature has heat exchanger heat transfer effect undesirable, sucks cold wind, and flue leaks gas, thermal insulation is bad.Enter the flue gas heat waste before retracting device and fail to keep an appointment 31 ~ 50%, carry out Insulation very important to the preservation of waste heat.
The waste heat recovery mainly mounting heat exchanger of current domestic shaft furnace, its key technology is that can heat exchanger adapt to the working environment of high dust.When connecting TRT, just can utilize shaft furnace waste heat to generate electricity.
No matter being mounting heat exchanger or installation waste heat boiler, is all larger to the transformation amount of integrated artistic.And do not consider from integrated artistic flow process the recovery of heat, therefore waste heat recovery effect is unsatisfactory.
Summary of the invention
First technical problem to be solved by this invention is to provide a kind of effective to waste gas dedusting, and Insulation is good and engineering amount of reform is less, and cost of investment is low, the method for the Shaft Furnace Pelletizing Process grog waste heat recovery that income is large.
Second technical problem to be solved by this invention is to provide a kind of device realizing the method for this Shaft Furnace Pelletizing Process grog waste heat recovery.
In order to solve above-mentioned first technical problem, the method for the Shaft Furnace Pelletizing Process grog waste heat recovery that the present invention adopts, its step comprises:
(1), on the chain mat machine of conveying pelletizing grog, stay-warm case is installed and carries out sealing thermal insulation process;
(2), use belt-cooling machine to cool in transportation high temperature pelletizing grog, belt-cooling machine is installed stay-warm case and carry out sealing thermal insulation process;
(3), hot blast carried out dust removal process before entering air-introduced machine;
(4), on wet bulb group belt conveyor, wet bulb group belt conveyor drying hood is arranged;
(5), by the high-temperature hot-air heated by grog by pipeline distribute and be transported to the combustion air entrance of shaft furnace, the combustion air entrance of rotary dryer and wet bulb group belt conveyor drying hood, as combustion air with carry out predrying to wet bulb group.
In technique scheme, in described step, all pipelines carry out isothermal holding.
In above-mentioned steps (3), two-stage whirlwind ash separater is adopted to carry out dedusting to hot blast.
In order to solve above-mentioned second technical problem, originally the device realizing the method for Shaft Furnace Pelletizing Process grog waste heat recovery provided, chain mat machine is provided with the first stay-warm case, the outlet jointing strip cold of described chain mat machine, described belt-cooling machine is provided with the second stay-warm case, described belt-cooling machine side is provided with cooling blower, opposite side is connected with deduster, described deduster is connected with air-introduced machine, wet bulb group belt conveyor is furnished with wet bulb group belt conveyor drying hood, the outlet of described air-introduced machine connects the combustion air entrance of shaft furnace respectively, the combustion air entrance of rotary dryer and drying airhood.
Described deduster adopts two-stage whirlwind ash separater.
Adopt method and the device thereof of the Shaft Furnace Pelletizing Process grog waste heat recovery of technique scheme, its operation principle is summarized as follows: pelletizing grog from shaft furnace temperature out more than 550 DEG C, then be transported in grog storehouse by chain mat machine and belt-cooling machine by grog, in this process, pelletizing externally dispels the heat in the form of radiation.Using belt-cooling machine to blast in the process that a large amount of cooling air cools high temperature Shaft Furnace Pelletizing Process grog, by convection heat transfer' heat-transfer by convection, cooling air obtains amount of heat from high temperature pelletizing grog, and temperature increases substantially, and becomes high temperature air.Insulation is adopted to pipeline, subtracts to greatest extent
few high temperatureair heat loss.Then its part is used as the combustion air of shaft furnace and rotary dryer, is equivalent to the initial temperature that improve combustion air, the amount of consumed gas of shaft furnace and rotary dryer can be reduced.A part can be used for carrying out predrying to wet bulb group, is equivalent to the water content decreasing wet bulb group, improves the initial temperature of wet bulb group simultaneously, wet bulb group is because of dry run thermally equivalent, both can improve pelletizing product quality, the coal gas amount needed for dry wet pelletizing can be reduced again, economize energy.
The present invention is effective to waste gas dedusting, and select two-stage whirlwind ash separater to carry out dedusting to hot blast, efficiency of dust collection reaches more than 90%.Consider from integrated artistic flow process, Insulation is good and engineering amount of reform is less, and cost of investment is low, and income is large.Use the method greatly can carry out recycling to pelletizing grog waste heat.According to computational analysis, by the method to domestic certain pelletizing plant 10m
2shaft furnace is transformed.The economic benefit that transformation brings comprises pellet quality raising, powder reclaims and gas saving three aspects calculate.If be 2200 × 365 × 93%=746790t by annual production, gas unit consumption is 0.5262GJ, and gas price is that 45.2 yuan/GJ calculates, year total economic benefit about 2,250,000 yuan.Economic benefit is very considerable.
In sum, the present invention is a kind of effective to waste gas dedusting, and Insulation is good and engineering amount of reform is less, and cost of investment is low, the method for the Shaft Furnace Pelletizing Process grog waste heat recovery that income is large and device thereof.
Accompanying drawing explanation
figure1 is waste heat recovery work of the present invention signal
figure.
figure2 is chain mat machine waste heat recovery work signals
figure.
figure3 is belt-cooling machine waste heat recovery work signals
figure.
figure4 is that wet bulb rolls into a ball predrying work signal
figure.
figure5 is that stay-warm case installs signal
figure.
Detailed description of the invention
The specific embodiment of the present invention, below in conjunction with attached
figuredescribe in detail.
See
figure1,
figure2,
figure3 Hes
figure4, the method for Shaft Furnace Pelletizing Process grog waste heat recovery, its step comprises:
(1), on the chain mat machine 1 of conveying pelletizing grog, the first stay-warm case 2 is installed and carries out sealing thermal insulation process;
(2), use belt-cooling machine 3 pairs of high temperature pelletizing grogs to cool in transportation, belt-cooling machine 3 is installed the second stay-warm case 4 and carry out sealing thermal insulation process; The outlet of belt-cooling machine 3 is to being connected to hopper 10;
(3), hot blast enters shaft furnace respectively under the effect of air-introduced machine 7, wet bulb is rolled into a ball in belt conveyor airhood and drying machine, and hot blast adopted deduster to carry out dust removal process before entering air-introduced machine 7; According to hot air flow and pressure and need resistant to elevated temperatures requirement, this method selects two-stage whirlwind ash separater 6 pairs of hot blasts to carry out dedusting, and efficiency of dust collection reaches more than 90%;
(4), on wet bulb group belt conveyor 9 arrange wet bulb group belt conveyor drying hood 8, wet bulb group belt conveyor drying hood 8 ensures that being introduced through the hot blast come carries out even dry heat to wet bulb group.
(5), by the high-temperature hot-air heated by grog by pipeline distribute and be transported to shaft furnace combustion air entrance, rotary dryer combustion air entrance and wet bulb group belt conveyor drying hood 8, as combustion air with carry out predrying to wet bulb group.
In technique scheme, in described step, all pipelines carry out isothermal holding.
See
figure1,
figure2,
figure3 Hes
figure4, temperature is out more than 550 DEG C from shaft furnace for pelletizing grog, and be then transported in grog storehouse by chain mat machine and belt-cooling machine by grog, in this process, pelletizing externally dispels the heat in the form of radiation.The present invention seals chain mat machine 1, belt-cooling machine 3, and pelletizing grog waste heat can be made to be delivered to greatest extent in cooling-air, and pelletizing grog waste heat is heated cooling-air, then recycles by the heat in the cold air that heats.Hot-air is used for doing combustion air, thus improves the temperature of combustion air.Also be used for carrying out predrying to wet bulb group, wet bulb group, because of dry run thermally equivalent, both can improve pelletizing product quality, can reduce again the coal gas amount needed for dry wet pelletizing.
See
figure2, when pelletizing out in transportation, is installed the first stay-warm case 2 at the normal position of chain mat machine 1 and sealed on chain mat machine 1 from shaft furnace.This process mainly reduces the heat dissipation in pelletizing transportation.
See
figure3, when pelletizing grog is transported to belt-cooling machine 3, the cooling blower 5 of belt-cooling machine 3 bloats cooling air and cools pelletizing grog.At the normal position of belt-cooling machine 3, second stay-warm case 4 is installed to seal.After cooling air and high temperature pelletizing grog carry out heat exchange, hot blast is introduced in two-stage whirlwind ash separater 6 and carries out dedusting, is then transported under the effect of air-introduced machine 7 in the combustion-supporting pipeline of shaft furnace and rotary dryer with in the wet bulb group belt conveyor drying hood 8 of transportation of wet pelletizing belt 9.The outlet of belt-cooling machine 3 is to being connected to hopper 10;
See
figure4, install wet bulb group belt conveyor drying hood 8 at the normal position of the interlude of conveying wet bulb group belt 9, wet bulb group belt conveyor drying hood 8 arranges multiple little air inlet, and from then on hot blast enters belt conveyor drying hood 8 pairs of wet bulb groups of wet bulb group and carry out predrying.In the below of wet bulb group belt conveyor drying hood 8, an air outlet is set.
See
figure5, first stay-warm case 2 and the second stay-warm case 4 all adopt overlap up and down, side supports fixed form, this connected mode difficulty of construction is little, can install in process of production, and overhaul, easy to maintenance.
Claims (5)
1. a method for Shaft Furnace Pelletizing Process grog waste heat recovery, its feature: its step comprises:
(1), on the chain mat machine of conveying pelletizing grog, stay-warm case is installed and carries out sealing thermal insulation process;
(2), use belt-cooling machine to cool in transportation high temperature pelletizing grog, belt-cooling machine is installed stay-warm case and carry out sealing thermal insulation process;
(3), hot blast carried out dust removal process before entering air-introduced machine;
(4), on wet bulb group belt conveyor, wet bulb group belt conveyor drying hood is arranged;
(5), by the high-temperature hot-air heated by grog by pipeline distribute and be transported to the combustion air entrance of shaft furnace, the combustion air entrance of rotary dryer and wet bulb group belt conveyor drying hood, as combustion air with carry out predrying to wet bulb group.
2. the method for Shaft Furnace Pelletizing Process grog according to claim 1 waste heat recovery, its feature: in described step, all pipelines carry out isothermal holding.
3. the method for Shaft Furnace Pelletizing Process grog according to claim 1 and 2 waste heat recovery, its feature: in above-mentioned steps (3), adopts two-stage whirlwind ash separater to carry out dedusting to hot blast.
4. realize the device of the method for Shaft Furnace Pelletizing Process grog according to claim 1 waste heat recovery, it is characterized in that: the first stay-warm case (2) is installed on chain mat machine (1), the outlet jointing strip cold (3) of described chain mat machine (1), described belt-cooling machine (3) is provided with the second stay-warm case (4), described belt-cooling machine (3) side is provided with cooling blower (5), opposite side is connected with deduster (6), described deduster is connected with air-introduced machine (7), wet bulb group's belt conveyor (9) is furnished with wet bulb group's belt conveyor drying hood (8), the outlet of described air-introduced machine (7) connects the combustion air entrance of shaft furnace respectively, the combustion air entrance of rotary dryer and dry airhood (8).
5. the device realizing the method for Shaft Furnace Pelletizing Process grog waste heat recovery according to claim 4, is characterized in that: described deduster adopts two-stage whirlwind ash separater (6).
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107246803A (en) * | 2017-06-08 | 2017-10-13 | 东北大学 | A kind of soil conditioner cooling procedure waste heat recovery is with utilizing device and method |
| CN109099718A (en) * | 2018-10-24 | 2018-12-28 | 株洲火炬工业炉有限责任公司 | A kind of rotary kiln residual neat recovering system |
| CN109592915A (en) * | 2017-09-30 | 2019-04-09 | 山东博研粉体技术装备有限公司 | A kind of double thorax kiln ash discharge systems |
| CN110440084A (en) * | 2018-05-05 | 2019-11-12 | 吴衍钊 | A kind of pipe support |
| CN110983037A (en) * | 2019-12-20 | 2020-04-10 | 攀枝花钢城集团瑞通制冷设备有限公司 | Device for drying mineral powder raw material by utilizing pellet waste heat |
| CN114592124A (en) * | 2022-04-02 | 2022-06-07 | 浙江伯益环境科技有限公司 | Shaft furnace pellet finished product cooling and waste heat utilization system and using method thereof |
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| CN109592915B (en) * | 2017-09-30 | 2024-03-01 | 山东博研粉体技术装备有限公司 | Ash discharging system of double-chamber kiln |
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| CN110983037A (en) * | 2019-12-20 | 2020-04-10 | 攀枝花钢城集团瑞通制冷设备有限公司 | Device for drying mineral powder raw material by utilizing pellet waste heat |
| CN114592124A (en) * | 2022-04-02 | 2022-06-07 | 浙江伯益环境科技有限公司 | Shaft furnace pellet finished product cooling and waste heat utilization system and using method thereof |
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| CN104913652B (en) | 2016-11-30 |
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