CN1310237A - Converter bottom granulated-coal heating technology - Google Patents
Converter bottom granulated-coal heating technology Download PDFInfo
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- CN1310237A CN1310237A CN 00102708 CN00102708A CN1310237A CN 1310237 A CN1310237 A CN 1310237A CN 00102708 CN00102708 CN 00102708 CN 00102708 A CN00102708 A CN 00102708A CN 1310237 A CN1310237 A CN 1310237A
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- rotary hearth
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Abstract
The present invention is coal burning thermal technology for direct reducing furnace. In the bottom rotary furnace using coal with high volatile as fuel, granulated coal is spread to the surface of material layer via the feeding bin at the top and the vibrating feeder at the bottom. The volatile relieved by heating and the CD produced by the material layer are burned in the hot blast from the top and the sides of the furnace to supply heat required by the bottom rotary furnace. The semicoke forming material surface protecting layer may be recovered after discharge.
Description
The present invention is a kind of technical field of fire coal of direct reduction furnace.
Rotary hearth iron making is the emerging coal-based direct reduction technology of current development, though its reductive agent is all used coal, fuel mainly is to adopt Sweet natural gas or fuel oil, so fuel is facing to the resource scarcity and two problems that cost an arm and a leg.With the coal is that fuel can be avoided this two problems, but has many difficulties technically again, as processing of combustion system and coal ash etc.General conventional coal combustion process is difficult to solve, and the development of rotary hearth iron making is restricted.
The purpose of this invention is to provide a kind of coal combustion process that is used for direct reduction furnace reducing process, to realize with coal is the direct reducing process of fuel, thereby use aboundresources and cheap coal fuel, can reduce the rotary hearth furnace production cost, improve rotary hearth furnace productivity, reduce energy consumption, improve the quality of products and the industrial scale of favourable expansion rotary hearth furnace.
Main technical schemes of the present invention is to adopt to contain fugitive constituent up to 20～50% bituminous coal or brown coal, add-on is 100～350kg/t metallized pellet, after on the hot charge level in joining rotary hearth furnace, volatilization rapidly at high temperature, produce the fuel of the very high inflammable gas of calorific value as rotary hearth furnace, reality is not directly to burn coal, has therefore avoided burning the problem that coal produces.Coal after the volatilization forms semicoke; continue to cover on the metallized pellet aspect and form protective layer; work to prevent to reoxidize and strengthen reducing atmosphere; and these semicokes separable come out after discharging; make coal in rotary hearth furnace, bring into play multi-function action, form the coal-fired technology of the unique rotary hearth furnace of a cover, reached the effect of replace oil with coal and Sweet natural gas; improve rotary hearth furnace production efficiency and quality product, reduced energy expenditure.
Burning process of the present invention and coal method are to adopt the oscillating batch charger of custom-designed furnace roof coal bunker and bottom thereof, at rotary hearth furnace middle part promptly in the high-temperature zone of rotary hearth furnace, locate for 60 °～120 ° apart from discharge port, the length of discharge port is identical with rotary hearth furnace burner hearth radical length.(diameter 2～25mm) evenly spreads the surface that is taped against the furnace bottom bed of material, and it is heated to rapidly more than 800 ℃, and contained fugitive constituent all volatilization enters burner hearth, converges with the flue gas that produces in the stove, with bed of material countercurrent flow with the coal grain.At furnace roof and burner hearth side wall hot-blast spray nozzle or spout are set respectively, nozzle or spout quantity are 3～20, and the hot blast that sprays in the stove is 400～1000 ℃, and air quantity is 1500～2000m
3/ t metallized pellet, the hot blast rate that hot blast that sprays into according to top jet nozzle and side wall nozzle or spout spray into accounts for hot-blast spray nozzle or the spout that 40～80% and 20～60% of total hot blast rate is provided with top and side wall respectively.The CO burning that coal fugitive constituent and reduction are produced is for rotary hearth furnace provides institute's heat requirement.The interchanger of the pre-thermal utilization rotary hearth furnace fume afterheat of wind is realized the used heat utilization, and guarantees that rotary hearth furnace smoke combustion temperature can reach 1300～1500 ℃, satisfies the needs of high temperature fast restore.
Rotary hearth furnace fuel coal of the present invention requires to contain fugitive constituent 20～50%; S＜1%; Ash content＜15%; C40～70%; Granularity is 2～25mm, and the coal amount is 100～350kg/t metallized pellet.
Accompanying drawing 1 of the present invention and accompanying drawing 2 are converter bottom granulated-coal heating device synoptic diagram.Fig. 1 illustrates rotary hearth furnace furnace roof coal bunker (1), oscillating feeder (2), coal grain discharge port (3), rotary hearth furnace top (4), side wall (5), hot-blast spray nozzle or spout (6) and (7), incendiary coal pellet layer (8), the metallized pellet bed of material (9).Fig. 2 illustrates the position of coal bunker coal grain discharge port (3), hot-blast spray nozzle or spout (7), and metallized pellet finished product discharge port (10), top coal bunker and metallized pellet discharge port angle are 60 °～120 °.Arrow is represented the metallized pellet travel direction.Metallized pellet carries out in the reduction reaction process of metallized pellet through super-dry, heating in the rotary hearth furnace, continuous heating of metal pellet, and when its temperature reaches a high temperature 900～1500 ℃, the ferric oxide in its metallized pellet is reduced; Continue in the reduction process,, form tectum, spray into the hot blast burning simultaneously and continue to heat up, improve the reducing degree and the quality thereof of metallized pellet in order to be sprinkled into the coal grain to its charge level.
The present invention and technical background are relatively; having the coal grain evaporable combustiblecomponents of employing and hot blast mixed firing heats up; for guaranteeing the perfect combustion of evaporable combustiblecomponents; adopt top and side wall to arrange hot-blast spray nozzle or air port; the hot blast of spout and coal grain fugitive constituent are reverse convection current and have the flow feature of certain angle, and its combustion method is simple, practical, effective, reliable.The present invention can avoid adopting the costing an arm and a leg of resource-constrained, broad-spectrum Sweet natural gas or fuel oil, the method for burning coal that adopts is different from the combustion method that routine is utilized coal-fired burner, but with spreading the coal method, thereby simplified the fired coal combustion nozzle, and the Pneumatic conveyer of numerous and jumbled conveying fine coal.Therefore, the device of this coal combustion process is simple, and facility investment reduces, thereby becomes economic, practical coal combustion process.
The present invention both had been different from the old-fashioned coal combustion method of spreading; also be different from coal-fired powder burner noz(zle) combustion method; be fugitive constituent and the hot blast mixed firing that utilizes coal; utilize the coal-fired semicoke protection metallized pellet that forms again; prevent the top layer oxidation of metallized pellet; guaranteeing the reduction of hot metal pellet again, therefore is to guarantee that metallized pellet improves the important measures of degree of metalization and quality.Gas-firing and fuel oil can reach the raising reduction temperature, but are difficult to prevent the oxidation of metallized pellet upper layer, if prevent the oxidation of metallized pellet top layer, can cause the incomplete combustion degree to strengthen and the increase fuel consumption again.With the coal combustion process of routine, also be difficult to solve and coordinate the relation between output, quality and fuel consumption, reach best effect.The present invention then can solve and economize on coal, the top layer oxidation of perfect combustion and protection metallized pellet, reaches the requirement of energy-conservation, high yield, high quality pellet formation.Therefore be that other method is unapproachable.
Accompanying drawing 1 of the present invention is the rotary hearth furnace longitudinal sectional drawing, the main device and the production status of the fire coal in the expression rotary hearth furnace metallized pellet technological process of production.Accompanying drawing 2 is the rotary hearth furnace transverse cross-sectional view, and the expression coal bunker is provided with position and the spreading of coal grain for along rotary hearth furnace uniform distribution situation radially, and the distribution situation of rotary hearth furnace hot-blast spray nozzle or spout, and the finished product discharge port position of metallized pellet etc.
The embodiment of the invention
A rotary hearth furnace, hearth area 120M
2, designed productive capacity 8.4t/h.The furnace roof stoke hole is 10, coal amount 1000～1500Kg/h.With multitube oscillating feeder feed, feeding machine and furnace roof coal feeding pipe are hose connection with corrugated tube.The granularity of coal is 2～25mm, makes fuel with high-volatile bituminous coal, fugitive constituent＞30%, ash＜15%, sulphur＜0.7%.
Claims (3)
1; a kind of coal combustion process of rotary hearth iron making; it is characterized in that the coal-fired bituminous coal grain of using; the brown coal grain; the furnace roof middle part is provided with coal bunker; be in the high-temperature zone of rotary hearth furnace; and angle is 60～120 ° between the discharge port of metallized pellet; by oscillating feeder through the coal bunker discharge port; its length is identical with rotary hearth furnace burner hearth radical length; the bituminous coal grain is sprinkled in the stove; uniform spreading is to the high temperature pelletizing charge level that moves; the coal grain discharges the release of combustible volatile and reducting pellet process through heating reduzate CO forms flue gas; with 500～1000 ℃ the hot blast mixed firing that sprays in the stove, the products of combustion temperature reaches 1300～1500 ℃, becomes semicoke through the evaporable fire coal again; continue to cover the metallized pellet charge level, form protective layer.
2, coal combustion process according to claim 1 is characterized in that the composition of coal is C 40～70% by mass percentage, S＜1%, and ash content＜15%, volatile matter 20～50%, coal grain granularity is 2～25mm, add-on is 100～350kg/t metallized pellet.
3, the method for fire coal according to claim 1 is characterized in that the hot blast that sprays in the stove is to be undertaken by the hot-blast spray nozzle that is located at furnace roof and furnace side wall, and nozzle quantity is 3～20, and the hot blast that sprays in the stove is 400～1000 ℃, and air quantity is 1500～2000m
3/ t metallized pellet, the hot blast that hot blast that sprays into by the top and side wall spray into is respectively the hot-blast spray nozzle that 40～80% and 20～60% of total hot blast rate is provided with top and side wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00102708 CN1310237A (en) | 2000-02-21 | 2000-02-21 | Converter bottom granulated-coal heating technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00102708 CN1310237A (en) | 2000-02-21 | 2000-02-21 | Converter bottom granulated-coal heating technology |
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| Publication Number | Publication Date |
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| CN1310237A true CN1310237A (en) | 2001-08-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 00102708 Pending CN1310237A (en) | 2000-02-21 | 2000-02-21 | Converter bottom granulated-coal heating technology |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102643943A (en) * | 2012-05-07 | 2012-08-22 | 北京科技大学 | Rotary hearth furnace direct reduction process using oxygen enrichment and pulverized coal |
| CN107557512A (en) * | 2017-09-15 | 2018-01-09 | 重庆赛迪热工环保工程技术有限公司 | A kind of rotary hearth furnace joint production process |
-
2000
- 2000-02-21 CN CN 00102708 patent/CN1310237A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102643943A (en) * | 2012-05-07 | 2012-08-22 | 北京科技大学 | Rotary hearth furnace direct reduction process using oxygen enrichment and pulverized coal |
| CN107557512A (en) * | 2017-09-15 | 2018-01-09 | 重庆赛迪热工环保工程技术有限公司 | A kind of rotary hearth furnace joint production process |
| CN107557512B (en) * | 2017-09-15 | 2019-09-24 | 重庆赛迪热工环保工程技术有限公司 | A kind of rotary hearth furnace joint production process |
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