CN1172008C - Equipment and method for preheating gas and combustion-promoting air of blast furnace - Google Patents
Equipment and method for preheating gas and combustion-promoting air of blast furnace Download PDFInfo
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- CN1172008C CN1172008C CNB011397462A CN01139746A CN1172008C CN 1172008 C CN1172008 C CN 1172008C CN B011397462 A CNB011397462 A CN B011397462A CN 01139746 A CN01139746 A CN 01139746A CN 1172008 C CN1172008 C CN 1172008C
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Abstract
The present invention belongs to the field of hot air furnaces for high furnaces. A preheating device of coal gas and combustion supporting air for the high furnace in the present invention comprises a heat exchanger for using the waste flue gas and residual heat of the hot air furnace to preheat coal gas and combustion supporting air, and a combustion supporting air preheating device connected with the heat exchanger in parallel, wherein the preheating device is composed of more than two hot air furnaces connected in parallel, corresponding valves, regulating valves and pipelines connected with each other. The preheating method of the combustion supporting gas is to use two devices to preheat the combustion supporting air and to control the temperature of total combustion supporting air through two temperatures and wind quantities of preheated combustion supporting air.
Description
Affiliated field
The invention belongs to the blast furnace field, relate to the preheating of blast furnace with hotblast stove and coal gas and combustion air.
Background technology
In the prior art, blast furnace has two kinds of methods with the preheating of coal gas and combustion air: a kind of is form with interchanger, utilizes the waste gas residual heat of hotblast stove self flue, and coal gas that preheating is required and combustion air can be preheated to 150 ℃ with coal gas and combustion air.But along with the progress of blast-furnace technique, blast furnace gas calorific value is more and more lower, and this just requires the required hot blast temperature of blast furnace more and more higher, and only coal gas and combustion air being preheated to 150 ℃ can not meet the demands.Second method is to adopt coal gas and the combustion air primary heater unit shown in the accompanying drawing 1.This device is made up of preposition roasting kiln 41, preposition roasting kiln burner 42, air heat exchanger 43 and gas change heater 44, and two interchanger 43 and 44 are in the preposition hotblast stove 41.By pipeline coal gas and air are introduced burning in the preposition roasting kiln burner 42, with two interchanger 43 and 44 heating, the gas change heater 44 that is arranged in the preposition roasting kiln heats the coal gas that passes through in interior, and similarly air heat exchanger 43 is with the combustion air heating of passing through in interior.Coal gas after the heating and combustion air burn by pipeline 47 and 48 input blast furnace and hot blast cupola combustion devices 45, and the hot blast that is produced enters blast funnace hot blast stove.This method can make blast funnace hot blast stove 46 obtain higher wind-warm syndrome.Just because the temperature of preposition roasting kiln 41 is higher, and two kinds of interchanger continue at high temperature to work, the interchanger life-span is short, and safety of airheater is relatively poor.
In addition, in the prior art, the pre-heating mean of hotblast stove combustion air also has two kinds: a kind of is to use the interchanger warm-up combustion-supporting air, but preheating temperature does not reach requirement; Second method is to adopt the method heating combustion air of hotblast stove self-preheating, and this method can realize the desired high wind-warm syndrome of hotblast stove, but device is complicated, and equipment is more, and pipeline is also complicated, not only cost height, and maintenance difficult.
Summary of the invention
The object of the present invention is to provide a kind of requirement that can satisfy blast furnace with the high wind-warm syndrome of hotblast stove, and blast furnace simple in structure again coal gas and combustion air primary heater unit and method thereof.
At above-mentioned purpose, blast furnace of the present invention comprises the combustion air primary heater unit that utilizes hotblast stove self stack gases waste heat to come the interchanger of preheating gas and combustion air and be in parallel with it with coal gas and combustion air primary heater unit.
This combustion air primary heater unit is made up of with gas regulator and air control valve and interconnective pipeline with gas inlet and gas entry valve, hotblast stove the little hotblast stove of two or more and assembling in parallel and a burner that matches, combustion air entrance and exit valve, Combustion of Hot Air Furnace.The pipeline of cold combustion air links to each other with burner blower by variable valve, and the hot combustion air pipeline of institute's preheating is in parallel with the pipeline of interchanger combustion air, and both are summarized in the combustion air pipeline.
The blast furnace of the present invention pre-heating mean of hotblast stove coal gas and combustion air, comprising with the form of interchanger utilizes hotblast stove self stack gases waste heat to come preheating gas and combustion air, simultaneously, utilize the combustion air of another combustion air primary heater unit institute preheating in parallel with interchanger, in parallelly with the combustion air of interchanger institute preheating converge total combustion air, enter the combustion air house steward, enter the cold-air flap of combustion air primary heater unit and interchanger by adjusting, control enters the freezing air amount in combustion air primary heater unit and the interchanger respectively, and then by control with regulate through the combustion-supporting air quantity of combustion air primary heater unit institute preheating with through the combustion-supporting air quantity of interchanger preheating, obtain predetermined total combustion air temperature, finally reach and regulate and control the wind-warm syndrome of blast furnace with hotblast stove.The ratio that accounts for the total combustion-supporting air quantity (A+B) that enters hot-blast stove gas burner through the combustion-supporting air quantity A of combustion air primary heater unit institute preheating is 0.1-1.0, and B is the combustion-supporting air quantity through the interchanger preheating, i.e. A/ (A+B)=0.1-1.0.
The method of combustion air primary heater unit warm-up combustion-supporting air is to be taken up in order of priority in running order or state of combustion by each little hotblast stove in the little hotblast stove group of two or more and configuration in parallel, warm-up combustion-supporting air in turn, and overlap, be that each little hotblast stove is incited somebody to action the good combustion air of preheating respectively, pass through corresponding pipeline, import hot combustion air total pipeline in turn, import blast furnace more thereupon with in the burner of hotblast stove.By gas regulator and the air control valve of regulating little hotblast stove, the preheating temperature degree of may command combustion air.
The present invention is through the combustion air primary heater unit, and the temperature of the combustion air of institute's preheating can reach 900-1100 ℃, reaches 120-150 ℃ through the temperature of the combustion air of interchanger preheating.Blast furnace can reach more than 1200 ℃ with the wind-warm syndrome of hotblast stove.
Compared with prior art, the combustion air temperature height of institute of the present invention preheating can reach 1100 ℃, and the wind-warm syndrome of hotblast stove can reach more than 1200 ℃.In addition, of the present invention simple in structure, for ease of maintenaince, cost is low, and long service life.
Description of drawings
Accompanying drawing 1 is the structural representation of prior art blast furnace with hotblast stove coal gas and combustion air primary heater unit.
Accompanying drawing 2 is the structural representation of blast furnace of the present invention with coal gas and combustion air primary heater unit.
Find out that by Fig. 2 blast furnace of the present invention comprises the interchanger 32 that utilizes hotblast stove self stack gases waste heat to come preheating gas and combustion air and 31 and the combustion air primary heater unit 40 in parallel with it (among the figure in the frame of broken lines) with coal gas and combustion air primary heater unit.
This combustion air primary heater unit 40 is by two or more and little hotblast stove 1 that parallel arrangement is joined and 20 and the combustion air inlet valve 8 of the burner 2 and 21 that matches, combustion air inlet valve 6 and 23, combustion air outlet valve 7 and 24, little hotblast stove 1 and 20 and 25 and the gas regulator 10 of gas entry valve 9 and 26, little hotblast stove 1 and 20 and 27 and air control valve 11 and 28, and interconnective pipeline is formed.Cold combustion air pipeline 13 links to each other with burner blower 39 by variable valve 17, and the hot combustion air transport pipe 12 of this device 40 is in parallel with the combustion air pipeline 15 of interchanger 31, and both are summarized in combustion air total pipeline 19.
Among Fig. 2,29 are the blast furnace hotblast stove, and 30 is the burner of hotblast stove, 33,34,35,36,37 is temperature measurer, 3,4 coal gas and the air input channels that are respectively little hotblast stove 1 and 20,16,38 is flue, 51 is the gas inlet pipe road of hot-blast stove gas burner 30.
The warm of coal gas of the present invention and combustion air is as follows:
At first with the heat exchange form of interchanger 32 and 31, utilize the waste gas residual heat of hotblast stove 29 self flue, preheating gas and combustion air, preheating temperature can reach 120-150 ℃.
Meanwhile, utilize combustion air primary heater unit 40 warm-up combustion-supporting airs, its operation process is;
Little hotblast stove 1 is made as ventilation state (being working order) after the burning: combustion air outlet valve 7 and inlet valve 6 are opened, exhaust smoke valve 5, combustion air valve 8 and gas valve 9 are closed, valve 17 and burner blower are opened, combustion air is by burner blower 39, enter in the little hotblast stove 1 through valve 17 and combustion air pipeline 13, by heat storage medium heating in the little hotblast stove 1, hot combustion air by valve 7 and hot combustion air pipeline 12 with converged by the combustion air of interchanger 31 preheatings, enter in the lump in the combustion air total pipeline 19, enter subsequently in the burner 30.
At this moment, little hotblast stove 20 is state of combustion (being the accumulation of heat state): combustion air entrance and exit valve 23 and 24 is closed, exhaust smoke valve 22, combustion air valve 25 and gas valve 26 are opened, freezing air is by air line 4, enter in the burner 21 of little hotblast stove 20 through air control valve 28, burning is passed through gas line 3 with coal gas, enter in the burner 21 of little hotblast stove 20 through variable valve 27, burn with air mixed, the flue gas that combustion processes produces is with heat storage medium heating in the hotblast stove, and remaining flue gas is discharged through exhaust smoke valve 22 and flue 16.
When the heat release of the heat storage medium in the little hotblast stove 1 arrived to a certain degree, little hotblast stove 20 transferred ventilation state to, and little hotblast stove 1 transfers state of combustion to, and the working order of little hotblast stove 1 and little hotblast stove 20 is conversion alternately, heats combustion air continuously.By regulating variable valve 17 and 18, can control the combustion-supporting air quantity of interchanger 31 preheatings that enter among the combustion air house steward 19 and the combustion-supporting air quantity of 40 preheatings of combustion air primary heater unit respectively.The final temperature of controlling the total combustion air in the burner 30 that enters hotblast stove 29.
Embodiment
According to blast furnace of the present invention coal gas and combustion air primary heater unit and method thereof, four tests on the used hotblast stove of 100 meter 3 blast furnace, have been carried out, coal gas and combustion air primary heater unit that test is adopted are the device shown in the accompanying drawing 2, promptly one is by interchanger preheating gas and combustion air, simultaneously the combustion air primary heater unit warm-up combustion-supporting air of being made up of two little hotblast stoves and respective accessory thereof and pipeline.In the test, by regulating the temperature that coal gas that two little Combustion of Hot Air Furnace use and air are controlled hot combustion air, further by regulating the combustion-supporting air quantity that enters interchanger and combustion air primary heater unit respectively, control enters the temperature of blast furnace with the total combustion air in the hot-blast stove gas burner, reaches the purpose of control hotblast stove wind-warm syndrome.What test was tested has related parameter as shown in table 1.
The relevant test parameter of table 1 embodiment
| The test sequence number | Combustion air temperature (℃) | Two combustion-supporting air quantities account for the ratio (%) of total combustion air volume | The combustion air temperature that gathers (℃) | ||
| Interchanger 31 | Combustion air primary heater unit 40 | ||||
| Interchanger | The combustion air primary heater unit | ||||
| ?1 | ?120 | ?1000 | ?44.5 | ?55.5 | ?608 |
| ?2 | ?125 | ?1050 | ?47.0 | ?53.0 | ?650 |
| ?3 | ?130 | ?980 | ?32.9 | ?67.1 | ?700 |
| ?4 | ?/ | ?680 | ?0 | ?100 | ?680 |
Claims (2)
1, a kind of blast furnace comprises the interchanger (32,31) that utilizes hotblast stove (29) self stack gases waste heat to come preheating gas and combustion air with coal gas and combustion air primary heater unit, it is characterized in that:
This device also contains a combustion air primary heater unit (40) that is in parallel with combustion air interchanger (31);
This combustion air primary heater unit (40) is by two or more, and the little hotblast stove (1 of assembling in parallel, 20) and the burner (2 that matches, 21), combustion air inlet valve (6,23), combustion air outlet valve (7,24), hotblast stove (1,20) the combustion air inlet valve (8,25) and gas entry valve (9,26), hotblast stove (1,20) with gas regulator (10,27) and air control valve (11,28) and interconnective pipeline form, cold combustion air pipeline (13) links to each other with burner blower (39) by variable valve (17), hot combustion air transport pipe (12) is in parallel with the combustion air pipeline (15) of interchanger (31), and both are summarized in combustion air total pipeline (19).
2, a kind of pre-heating mean that adopts the blast furnace of primary heater unit described in the claim 1 with coal gas and combustion air comprises with interchanger (32,31) form and utilizes hotblast stove (29) self stack gases waste heat preheating gas and combustion air, it is characterized in that:
Utilize the combustion air of another combustion air primary heater unit (40) institute preheating in parallel with interchanger, in parallelly with the combustion air of interchanger (31) institute preheating merge into total combustion air, enter combustion air house steward (19), by regulated valve (17 and 18), control enters the freezing air amount in combustion air primary heater unit (40) and the interchanger (31) respectively, and then by control with regulate through the combustion-supporting air quantity of combustion air primary heater unit (40) institute preheating with through the combustion-supporting air quantity of interchanger (31) preheating, control the temperature of total combustion air, finally reach and regulate and control the wind-warm syndrome of blast furnace with hotblast stove; Accounting for the ratio that enters the total combustion-supporting air quantity in the hot-blast stove gas burner (30) through the combustion-supporting air quantity of combustion air primary heater unit (40) institute preheating is 0.1-1.0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011397462A CN1172008C (en) | 2001-11-30 | 2001-11-30 | Equipment and method for preheating gas and combustion-promoting air of blast furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011397462A CN1172008C (en) | 2001-11-30 | 2001-11-30 | Equipment and method for preheating gas and combustion-promoting air of blast furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1355323A CN1355323A (en) | 2002-06-26 |
| CN1172008C true CN1172008C (en) | 2004-10-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011397462A Expired - Fee Related CN1172008C (en) | 2001-11-30 | 2001-11-30 | Equipment and method for preheating gas and combustion-promoting air of blast furnace |
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| CN (1) | CN1172008C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1296495C (en) * | 2004-05-10 | 2007-01-24 | 四川大学 | High wind temperature obtaining method using pure blast furnace gas combustion |
| CN102618681A (en) * | 2012-04-19 | 2012-08-01 | 河南省豫兴热风炉工程技术有限公司 | Grate-free double-preheating top combustion type hot blast stove |
| CN103725818B (en) * | 2013-12-26 | 2015-10-28 | 上海宝钢节能环保技术有限公司 | A kind of hotblast stove low temperature exhaust heat degree of depth recovery system |
| CN106399612B (en) * | 2016-11-07 | 2019-01-25 | 上海铁戈炉业有限公司 | A kind of preheating energy-saving systems and pre-heating mean |
| CN107488771A (en) * | 2017-09-29 | 2017-12-19 | 四川德胜集团钒钛有限公司 | A kind of blast-furnace hot-air furnace system |
| CN110848724A (en) * | 2019-11-20 | 2020-02-28 | 景德镇陶瓷大学 | Three-channel heat accumulating type heat exchange device |
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2001
- 2001-11-30 CN CNB011397462A patent/CN1172008C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1355323A (en) | 2002-06-26 |
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