CN106967861A - Hot-blast stove combustion air timesharing pre-heating system - Google Patents
Hot-blast stove combustion air timesharing pre-heating system Download PDFInfo
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- CN106967861A CN106967861A CN201710383720.4A CN201710383720A CN106967861A CN 106967861 A CN106967861 A CN 106967861A CN 201710383720 A CN201710383720 A CN 201710383720A CN 106967861 A CN106967861 A CN 106967861A
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- combustion
- combustion air
- stove
- hot
- flue gas
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
- C21B9/14—Preheating the combustion air
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
- C21B9/10—Other details, e.g. blast mains
Abstract
The present invention is a kind of hot-blast stove combustion air timesharing pre-heating system, including hot-blast stove and combustion fan, the inner chamber bottom of hot-blast stove, which is provided with preheating device in combustion air stove, combustion air stove in preheating device, is provided with stove flue gas passage in combustion-supporting air heat-exchange passage and stove.The outlet of combustion fan can be connected by combustion air heat exchanger with combustion air inlet, combustion air passage and the first flue gas passage are provided with the combustion air heat exchanger, the outlet of the combustion air passage can be connected by the first combustion air path or the second combustion air path with the combustion air inlet, and combustion-supporting air heat-exchange passage concatenation is communicated on the second combustion air path in the stove.The pre-heating system can meet hot-blast stove and burn the need for stove puts aside amount of heat initial stage, and can meet the need for burning stove middle and later periods raising hot-blast stove dome temperature, simple in construction and cost input is relatively low.
Description
Technical field
Helped the present invention relates to metallurgy industry hot-blast stove technical field, more particularly to a kind of hot-blast stove suitable for iron-smelting process
Fire air timesharing pre-heating system.
Background technology
As the cost pressure of blast furnace maximization development and steel industry is original bigger, intensification of smelting process in BF, reduction are burnt
It is even more important than seeming.In addition to reduction coke ratio of starting with terms of production operation level and raw material and fuel quality, hot-blast stove is improved
Wind pushing temperature is also particularly important and effective means.
In order to reach more than 1250 DEG C of hot blast temperature, a small number of iron and steel enterprises use high heating value gas (coke-stove gas, converter
Coal gas etc.) burning stove is carried out, but domestic steel plant burn stove to realize high wind general lack of high heating value gas using Experience of Using Single Bf Gas
Temperature is still the preferred option of each iron and steel enterprise.
In order to realize high wind-warm syndrome under conditions of single fire blast furnace gas, it is necessary to which combustion air and coal gas are preheated.Often
Method has：Low-temperature prewarming is carried out to combustion air and coal gas using separate type heat pipe exchanger or plate type heat exchanger, used
Additional preheating stove or front combustion carry out high temperature preheating etc. to combustion air.Using lacking for the double preheatings of separate type heat exchanger low temperature
Point be preheating after combustion air and gas temperature at 180~210 DEG C, it is impossible to further improve hot-blast stove dome temperature, from
And improve hot blast temperature；Belonging to high temperature preheating using additional preheating stove or the double-preheating system with front combustion, (coal gas is pre-
Heat is to~200 DEG C, and air preheat is to~420 DEG C), it disclosure satisfy that single fire blast furnace gas realizes the requirement of high wind-warm syndrome, but there is knot
Structure is complicated, valve increases, increase is taken up an area, consumption coal gas, system more controls complexity, invests the high shortcoming of big, operating cost and nothing
Method extensive use.
Thus, the present inventor relies on experience and the practice for being engaged in relevant industries for many years, proposes a kind of hot-blast stove combustion air
Timesharing pre-heating system, to overcome the defect of prior art.
The content of the invention
It is an object of the invention to provide a kind of hot-blast stove combustion air timesharing pre-heating system, overcome and exist in the prior art
Pre-heating system it is complicated, the problems such as energy resource consumption is big, operating cost is high, the pre-heating system can meet hot-blast stove and burn stove
The need for initial stage puts aside amount of heat, and it can meet the need for stove middle and later periods raising hot-blast stove dome temperature is burnt, it is simple in construction
And cost input is relatively low.
The object of the present invention is achieved like this, a kind of hot-blast stove combustion air timesharing pre-heating system, including hot-blast stove and
Gas entry and combustion air inlet are provided with the top of combustion fan, the hot-blast stove, the bottom of the hot-blast stove is provided with
Flue gas is exported, and the flue gas outlet is connected with the bottom of chimney, and the inner chamber bottom of the hot-blast stove is provided with combustion air
Flue gas combustion-supporting air heat-exchange passage and stove in is provided with stove in preheating device in stove, the combustion air stove in preheating device
Passage, the outlet of the combustion fan can be connected by combustion air heat exchanger with the combustion air inlet, the combustion-supporting sky
Combustion air passage and the first flue gas passage are provided with gas heat exchanger, the outlet of the combustion air passage can pass through first
Combustion air path or the second combustion air path are connected with the combustion air inlet, combustion-supporting air heat-exchange passage in the stove
Concatenation is communicated on the second combustion air path；The top of flue gas passage and the inner chamber of the hot-blast stove connect in the stove
Logical, the bottom of flue gas passage and the flue gas outlet in the stove, the flue gas outlet sequentially can pass through first
Flue gas branch road and the first flue gas passage are connected with the bottom of the chimney.
In the better embodiment of the present invention, the gas entry can be supplied by gas change heater and blast furnace gas
Be provided with gas passage and the second flue gas passage in pipeline connection, the gas change heater, the outlet of the gas passage with
The gas entry connection；The flue gas outlet sequentially can also pass through the second flue gas branch road and the second flue gas passage
Connected with the bottom of the chimney.
In the better embodiment of the present invention, the outlet of the combustion fan can also be by changing with the combustion air
The combustion air bypass pipe that hot device is arranged in parallel is connected with the combustion air inlet, the gas entry can also be by coal gas by
Siphunculus is connected with the blast furnace gas supply line, flue gas outlet can also by with the first flue gas branch circuit parallel connection
The 3rd flue gas branch road set is connected with the bottom of the chimney.
In the better embodiment of the present invention, the entrance of the combustion air passage and the outlet of the combustion fan
The first combustion air path stop valve, the second combustion air path are serially connected with connection, the first combustion air path
Including the first combustion-supporting branch road and the second combustion-supporting branch road, one end of the first combustion-supporting branch road and the outlet of the combustion air passage
Connection, the other end of the first combustion-supporting branch road is connected with one end of combustion-supporting air heat-exchange passage in the stove, and described second helps
Combustion branch road one end connected with the other end of combustion-supporting air heat-exchange passage in the stove, the other end of the second combustion-supporting branch road and
The combustion air inlet connection.
In the better embodiment of the present invention, the combustion air passage is located on the first combustion air path
Outlet connected with the position between the entrance of the first combustion air path stop valve the first combustion-supporting branch road be set
One end, the other end of the first combustion-supporting branch road is connected with one end of combustion-supporting air heat-exchange passage in the stove, and described first helps
The first combustion-supporting branch road stop valve is serially connected with combustion branch road；One end of the second combustion-supporting branch road and combustion-supporting air heat-exchange in the stove
Helped on the other end connection of passage, the first combustion air path positioned at the first combustion air path stop valve with described
Fire and be serially connected with the other end that the position connection between air intake sets the second combustion-supporting branch road, the second combustion-supporting branch road
Second combustion-supporting branch road stop valve.
In the better embodiment of the present invention, the described second combustion-supporting branch road is located on the first combustion air path
The other end and the combustion air inlet between sequence of positions be serially connected with combustion air regulating valve and combustion air combustion valve.
In the better embodiment of the present invention, combustion-supporting air heat-exchange passage is by multiple heat exchanger tubes structure in parallel in the stove
Into.
In the better embodiment of the present invention, outlet and the coal of the gas passage and the coal gas bypass pipe
Sequential concatenation has gas regulator, gas stop valve and gas-fired valve between gas entrance.
In the better embodiment of the present invention, the coal gas bypass pipe can be controlled by being serially connected with the coal gas bypass pipe
The second stop valve and the 3rd are provided with and respectively communicated with first stop valve of connected state, the entrance and exit of the gas passage
The 4th stop valve and the 5th stop valve are provided with and respectively communicated with stop valve, the entrance and exit of the second flue gas passage.
In the better embodiment of the present invention, the combustion-supporting sky can be controlled by being serially connected with the combustion air bypass pipe
The 7th is provided with and respectively communicated with 6th stop valve of gas bypass pipe connected state, the entrance and exit of the combustion air passage
Be provided with and respectively communicated with stop valve and the 8th stop valve, the entrance and exit of the first flue gas passage the 9th stop valve and
Tenth stop valve.
In the better embodiment of the present invention, the flue gas exit is provided with chimney valve, the three wastes cigarette
The 11st stop valve of the 3rd flue gas branch road connected state can be controlled by being serially connected with gas branch road.
From the above mentioned, hot-blast stove combustion air timesharing pre-heating system of the invention has the advantages that：
(1) in hot-blast stove combustion air timesharing pre-heating system of the invention, in blast furnace gas supply line and combustion fan
Exit connect gas change heater and combustion air heat exchanger respectively, the flue gas outlet of hot-blast stove and gas change heater and help
Combustion air heat exchanger is respectively communicated with, and flue gas carries out heat exchange with coal gas and combustion air respectively, realizes coal gas and combustion air
Once preheating；The inner chamber of hot-blast stove sets preheating device in combustion air stove, realizes combustion air in hot blast furnace chamber
Secondary heat exchange heats up, and improves theoretical temperature combustion by improving the temperature after the latter stage combustion air preheating of burning stove, and then improve
Dome temperature, increases the amount of stored heat of checker brick；
(2) hot-blast stove combustion air timesharing pre-heating system of the invention, passes through the stop valve set on combustion-supporting branch road
The switching of combustion air path is realized, control is easy, using flexible；
(3) application of hot-blast stove combustion air timesharing pre-heating system of the invention is not limited by heat exchanger form, combustion-supporting
Air heat exchanger and gas change heater can use existing various forms of heat exchangers or its combining form, combustion air heat exchange
Device and gas change heater can realize the high efficiente callback of flue gas waste heat；
(4) application of hot-blast stove combustion air timesharing pre-heating system of the invention is not limited by hot-blast stove form, hot blast
Stove can be the multi-forms such as top ignition, external-burning, internal combustion type or pebble stove, hot-blast stove combustion air timesharing preheating system
System strong applicability, is conducive to popularization and application；
(5) hot-blast stove combustion air timesharing pre-heating system of the invention can meet hot-blast stove and be put aside largely initial stage in burning stove
The need for heat, and it can meet the need for stove middle and later periods raising hot-blast stove dome temperature is burnt；Hot-blast stove combustion air timesharing is pre-
Hot systems can make full use of the flue gas waste heat for burning stove different phase, hot-blast stove highest dome temperature be improved, so as to obtain high wind
Temperature, reduces energy resource consumption；The hot-blast stove combustion air timesharing pre-heating system of the present invention is simple in construction, and floor space is small, flexibility
It is high and cost input is relatively low, newly-built hot-blast stove is applicable not only to, hot-blast furnace transformation engineering is applied also for.
Brief description of the drawings
The following drawings is only intended to, in doing schematic illustration and explanation to the present invention, not delimit the scope of the invention.Wherein：
Fig. 1：For the schematic diagram of the hot-blast stove combustion air timesharing pre-heating system of the present invention.
In figure：
100th, hot-blast stove combustion air timesharing pre-heating system；
1st, hot-blast stove；
101st, gas entry；102nd, combustion air inlet；103rd, flue gas is exported；
2nd, combustion fan；
3rd, chimney；
4th, preheating device in combustion air stove；
51st, gas change heater；511st, gas passage；512nd, the second flue gas passage；
52nd, coal gas bypass pipe；
53rd, gas regulator；54th, gas stop valve；55th, gas-fired valve；
61st, combustion air heat exchanger；611st, combustion air passage；612nd, the first flue gas passage；
62nd, combustion air bypass pipe；
63rd, the first combustion air path；631st, the first combustion air path stop valve；
64th, the second combustion air path；
641st, the first combustion-supporting branch road；6411st, the first combustion-supporting branch road stop valve；
642nd, the second combustion-supporting branch road；6421st, the second combustion-supporting branch road stop valve；
65th, combustion air regulating valve；66th, combustion air combustion valve；
71st, the first flue gas branch road；
72nd, the second flue gas branch road；
73rd, the 3rd flue gas branch road；
74th, chimney valve；
81st, the first stop valve；82nd, the second stop valve；83rd, the 3rd stop valve；84th, the 4th stop valve；85th, the 5th cut-out
Valve；86th, the 6th stop valve；87th, the 7th stop valve；88th, the 8th stop valve；89th, the 9th stop valve；810th, the tenth stop valve；
811st, the 11st stop valve；812nd, the 12nd stop valve.
Embodiment
In order to which technical characteristic, purpose and effect to the present invention are more clearly understood from, now control illustrates this hair
Bright embodiment.
As shown in figure 1, the present invention provides a kind of hot-blast stove combustion air timesharing pre-heating system 100, including hot-blast stove 1 and help
Blower fan 2 is fired, in the present embodiment, hot-blast stove 1 can be more using top ignition, external-burning, internal combustion type or pebble stove etc.
Multi-form is planted, the quantity of hot-blast stove is multiple, and multiple hot-blast stoves are in be arranged in parallel；The top of hot-blast stove 1 is provided with coal
Gas entrance 101 and combustion air inlet 102, the bottom of hot-blast stove 1 are provided with flue gas outlet 103, flue gas outlet 103 and cigarette
The bottom connection of chimney 3, the inner chamber bottom (fire grate post area) of hot-blast stove 1 is provided with preheating device 4 in combustion air stove, helped
Flue gas passage in combustion-supporting air heat-exchange passage and stove is provided with stove in preheating device 4 in combustion air furnace, in present embodiment
In, combustion-supporting air heat-exchange passage is made up of multiple heat exchanger tube parallel connections in stove, when actual use, can by rationally setting heat exchanger tube
To play a part of evenly distributing to the cold wind air-flow that on air bottom of hot-blast stove 1 passes through；The outlet of combustion fan 2 can be by helping
Combustion air heat exchanger 61 or combustion air bypass pipe 62 (combustion air bypass pipe 62 can be used for technique maintenance) and combustion air
Entrance 102 is connected, and combustion air bypass pipe 62 is arranged in parallel with combustion air heat exchanger 61, and combustion air heat exchanger 61 can be adopted
With heat exchange of heat pipe or other can realize the heat exchanger that high-temperature waste flue gas exchange heat, be provided with combustion air heat exchanger 61 combustion-supporting
The flue gas passage 612 of air duct 611 and first, the outlet of combustion air passage 611 can pass through the first combustion air path 63
Or second combustion air path 64 connected with combustion air inlet 102, combustion-supporting air heat-exchange passage concatenation is communicated in second in stove
On combustion air path 64；Gas entry 101 can pass through gas change heater 51 or coal gas bypass pipe 52 and blast furnace gas supply pipe
Road (prior art, figure not shown in) connection, coal gas bypass pipe 52 is arranged in parallel with gas change heater 51, and gas change heater 51 can
With using heat exchange of heat pipe or other can realize the heat exchanger of high-temperature waste flue gas heat exchange, be provided with coal gas in gas change heater 51
The flue gas passage 512 of passage 511 and second, the outlet of gas passage 511 is connected with gas entry 101, in the present embodiment,
Sequential concatenation has gas regulator 53, coal gas to cut between the outlet of gas passage 511 and coal gas bypass pipe 52 and gas entry 101
Disconnected valve 54 and gas-fired valve 55；The top of flue gas passage is connected with the inner chamber of hot-blast stove 1 in stove, flue gas passage in stove
Bottom is connected with flue gas outlet 103, and flue gas outlet 103 can pass through the first flue gas branch road 71, the second flue gas branch road 72
Or connected by the 3rd flue gas branch road 73 (the 3rd flue gas branch road 73 can be used for technique and overhaul) with the bottom of chimney 3, the
One flue gas branch road 71, the second flue gas branch road 72 and the 3rd flue gas branch road 73 are arranged in parallel, the first flue gas branch road 71 with
First flue gas passage 612 concatenation connection, the second flue gas branch road 72 concatenates connection with the second flue gas passage 512, and first gives up
Exhaust gases passes 612, the outlet of the second flue gas passage 512 are connected with the bottom of chimney 3.In the present embodiment, flue gas goes out
It is provided with to be serially connected with chimney valve 74, the 3rd flue gas branch road 73 at mouth 103 and can controls the connected state of the 3rd flue gas branch road 73
The 11st stop valve 811.The flue gas that hot-blast stove 1 burns stove generation is first passed through in the stove in combustion air stove in preheating device 4
Flue gas passage from flue gas outlet 103 by hot-blast stove 1, then through the first flue gas branch road 71 and the first flue gas passage 612,
Second flue gas branch road 72 and the second flue gas passage 512 flow to the discharge system of chimney 3 through the 3rd flue gas branch road 73.
In the hot-blast stove combustion air timesharing pre-heating system of the present invention, in going out for blast furnace gas supply line and combustion fan
Gas change heater and combustion air heat exchanger, flue gas outlet and gas change heater and the combustion-supporting sky of hot-blast stove are connected at mouthful respectively
Gas heat exchanger is respectively communicated with, and flue gas carries out heat exchange with coal gas and combustion air respectively, realizes the one of coal gas and combustion air
Secondary preheating；The inner chamber of hot-blast stove sets preheating device in combustion air stove, realizes that combustion air is secondary in hot blast furnace chamber
Heat exchange heating, improves theoretical temperature combustion, and then improve vault by improving the temperature after the latter stage combustion air preheating of burning stove
Temperature, the amount of stored heat of increase checker brick (prior art)；The application of the hot-blast stove combustion air timesharing pre-heating system of the present invention is not
Limited by heat exchanger form, combustion air heat exchanger and gas change heater can using existing various forms of heat exchangers or
Its combining form, combustion air heat exchanger and gas change heater can realize the high efficiente callback of flue gas waste heat；The heat of the present invention
The application of wind furnace combustion air timesharing pre-heating system is not limited by hot-blast stove form, hot-blast stove combustion air timesharing pre-heating system
Strong applicability, is conducive to popularization and application；The hot-blast stove combustion air timesharing pre-heating system of the present invention can meet hot-blast stove in burning
The need for stove puts aside amount of heat initial stage, and it can meet the need for stove middle and later periods raising hot-blast stove dome temperature is burnt；Hot-blast stove
Combustion air timesharing pre-heating system can make full use of the flue gas waste heat for burning stove different phase, improve hot-blast stove highest vault temperature
Degree, so as to obtain high wind-warm syndrome, reduces energy resource consumption；The hot-blast stove combustion air timesharing pre-heating system of the present invention is simple in construction, accounts for
Ground area is small, and flexibility is high and cost input is relatively low, is applicable not only to newly-built hot-blast stove, applies also for hot-blast furnace transformation engineering.
Further, as shown in figure 1, the outlet of the entrance of combustion air passage 611 and combustion fan 2, first is combustion-supporting
The first combustion air path stop valve 631 is serially connected with air flue 63, the second combustion air path 64 includes the first combustion-supporting branch
The combustion-supporting branch road 642 in road 641 and second, one end of the first combustion-supporting branch road 641 and the outlet of combustion air passage 611, first
The other end of combustion-supporting branch road 641 is connected with one end of combustion-supporting air heat-exchange passage in stove, one end of the second combustion-supporting branch road 642 and stove
The other end connection of interior combustion-supporting air heat-exchange passage, the other end of the second combustion-supporting branch road 642 is connected with combustion air inlet 102.
In the present embodiment, in order to better profit from combustion-supporting sky in the waste heat of flue gas, the other end and stove of the first combustion-supporting branch road 641
The bottom connection of gas heat exchanger channels, one end of the second combustion-supporting branch road 642 is connected with the top of combustion-supporting air heat-exchange passage in stove.
In present embodiment, the other end on the first combustion air path 63 positioned at the foregoing second combustion-supporting branch road 642 enters with combustion air
Sequence of positions between mouth 102 is serially connected with combustion air regulating valve 65 and combustion air combustion valve 66.
Further, as shown in figure 1, being located at the outlet and first of combustion air passage 611 on the first combustion air path 63
Position connection between the entrance of combustion air path stop valve 631 sets one end of the first foregoing combustion-supporting branch road 641, first
The other end of combustion-supporting branch road 641 is connected with one end of combustion-supporting air heat-exchange passage in stove, and is serially connected with the first combustion-supporting branch road 641
One combustion-supporting branch road stop valve 6411；One end of second combustion-supporting branch road 642 is connected with the other end of combustion-supporting air heat-exchange passage in stove,
It is located at the position between the first combustion air path stop valve 631 and combustion air inlet 102 on first combustion air path 63
Connection sets and is serially connected with the second combustion-supporting branch road stop valve on the other end of the second combustion-supporting branch road 642, the second combustion-supporting branch road 642
6421.At hot blast stove burning initial stage, it is not necessary to when enabling preheating device 4 in combustion air stove, the first combustion-supporting branch road cut-out is closed
The combustion-supporting branch road stop valve 6421 of valve 6411 and second, opens the first combustion air path stop valve 631, combustion air is helped through first
Combustion air flue 63 is transported in hot-blast stove 1；In the hot blast stove burning middle and later periods, it is necessary to enable preheating device 4 in combustion air stove
When, the first combustion air path stop valve 631 is closed, the cut-out of the first combustion-supporting branch road stop valve 6411 and second combustion-supporting branch road is opened
Valve 6421, combustion air is through combustion-supporting air heat-exchange passage, the second combustion-supporting branch road 642, combustion-supporting sky in the first combustion-supporting branch road 641, stove
Gas regulating valve 65 and combustion air combustion valve 66 are transported in hot-blast stove 1., can be according to the spirit of flue gas temperature in practical operation
The time that preheating device 4 comes into operation in combustion-supporting air furnace in control hot-blast stove 1 living, the time can be selected in flue gas temperature
At the time of more than some setting value, the setting value can be 220 DEG C, 250 DEG C, 300 DEG C or other temperature.
Further, as shown in figure 1, the first of the connected state of coal gas bypass pipe 52 can be controlled by being serially connected with coal gas bypass pipe 52
The second stop valve 82 and the 3rd stop valve 83 are provided with and respectively communicated with stop valve 81, the entrance and exit of gas passage 511, the
The 4th stop valve 84 and the 5th stop valve 85 are provided with and respectively communicated with the entrance and exit of two flue gas passages 512.
Further, as shown in figure 1, the connected state of combustion air bypass pipe 62 can be controlled by being serially connected with combustion air bypass pipe 62
The 7th stop valve 87 and are provided with and respectively communicated with 6th stop valve 86 of state, the entrance and exit of combustion air passage 611
The 9th stop valve 89 and the tenth is provided with and respectively communicated with eight stop valves 88, the entrance and exit of the first flue gas passage 612 to cut
Disconnected valve 810.
As shown in figure 1, further, the quantity of combustion fan 2 is multiple, and multiple combustion fans 2 are arranged in parallel, multiple combustion-supporting
The exit of blower fan sets 1 the 12nd stop valve 812 respectively, and the outlet of each 12nd stop valve 812 can be with combustion air passage
The entrance connection of 611 entrance or combustion air bypass pipe 62.In the specific embodiment of the present invention, the number of combustion fan 2
Measure as two.
In the specific embodiment of the present invention, hot-blast stove 1 is top combustion stove, and stove initial stage, flue gas are burnt in hot-blast stove 1
Temperature is relatively low, it is not necessary to enable preheating device 4 in combustion air stove, now closes the first stop valve 81, the 6th stop valve 86,
One combustion-supporting branch road stop valve 6411, the second combustion-supporting stop valve 811 of branch road stop valve 6421 and the 11st, open the second stop valve
82nd, the 3rd stop valve 83, the 4th stop valve 84, the 5th stop valve 85, the 7th stop valve 87, the cut-out of the 8th stop valve the 88, the 9th
Valve 89, the tenth stop valve 810, the combustion air path stop valve 631 of chimney valve 74 and first, now coal gas through gas passage 511,
Gas regulator 53, gas stop valve 54, gas-fired valve 55 are entered in hot-blast stove 1 by gas entry 101 to burn, combustion-supporting sky
Gas passes through through combustion air passage 611, the first combustion air path 63, combustion air regulating valve 65 and combustion air combustion valve 66
Combustion air inlet 102 carries out combustion-supporting into hot-blast stove 1；The flue gas produced in hot-blast stove 1 is through the He of the second flue gas passage 512
The row of first flue gas passage 612 to chimney, flue gas in gas change heater 51 and combustion air heat exchanger 61 respectively with coal gas
Heat exchange is carried out with combustion air, the once preheating of coal gas and combustion air is realized；
In the hot blast stove burning middle and later periods, the temperature of flue gas is raised to above after setting value (such as 290 DEG C), is enabled and is helped
Preheating device 4 in air furnace is fired, the first combustion-supporting branch road stop valve 6421 of combustion-supporting branch road stop valve 6411 and second is opened, the is closed
One combustion air path stop valve 631, combustion air is through combustion-supporting sky in combustion air passage 611, the first combustion-supporting branch road 641, stove
Gas heat exchanger channels, the second combustion-supporting branch road 642, combustion air regulating valve 65 and combustion air combustion valve 66 are transported in hot-blast stove 1,
Flue gas carries out heat exchange in preheating device 4 in combustion air stove with combustion air, realizes the secondary preheating of combustion air.
In the specific embodiment of the present invention, when hot-blast stove 1 burns stove, enable gas change heater 51 and combustion air is changed
Hot device 61 and in not enabled combustion air stove during preheating device 4, flue gas mean temperature is exchanged heat at 325 DEG C or so using coal gas
Coal gas and combustion air can be preheated to 200 DEG C or so of mean temperature by device 51 and combustion air heat exchanger 61；In hot blast stove burning
Middle and later periods, preheating device 4 in combustion air stove is enabled, a part of heat of flue gas is used for combustion-supporting air heat-exchange passage in stove
Interior combustion air carries out secondary preheating, and the flue gas mean temperature for exporting outflow from flue gas is reduced to 295 DEG C or so, use
Coal gas and combustion air can be preheated to 175 DEG C or so of mean temperature by gas change heater 51 and combustion air heat exchanger 61, now
The combustion air mean temperature of combustion-supporting air heat-exchange passage is 175 DEG C in towards stove.The temperature of the flue gas produced in hot-blast stove
Constantly rise, can reach 430 DEG C, when carrying out secondary preheating to combustion air due to flue gas, logical by flue gas in stove
The ratio of combustion-supporting air quantity in the flue gas amount and stove in road in combustion-supporting air heat-exchange passage is by the first flue gas passage 612
Flue gas amount and combustion air passage 611 combustion-supporting air quantity ratio two times of (flue gas amounts of flue gas passage in stove
There is half to be preheated by the second flue gas passage 512 to coal gas), flue gas amount is sufficient, and what flue gas can be by 175 DEG C is combustion-supporting
Air preheat is to more than 320 DEG C.When burning stove later stage combustion air preheating temperature reaches 320 DEG C, hot-blast stove dome temperature is at least
40 DEG C can be improved, wind pushing temperature can improve more than 30 DEG C.
From the above mentioned, hot-blast stove combustion air timesharing pre-heating system of the invention has the advantages that：
(1) in hot-blast stove combustion air timesharing pre-heating system of the invention, in blast furnace gas supply line and combustion fan
Exit connect gas change heater and combustion air heat exchanger respectively, the flue gas outlet of hot-blast stove and gas change heater and help
Combustion air heat exchanger is respectively communicated with, and flue gas carries out heat exchange with coal gas and combustion air respectively, realizes coal gas and combustion air
Once preheating；The inner chamber of hot-blast stove sets preheating device in combustion air stove, realizes combustion air in hot blast furnace chamber
Secondary heat exchange heats up, and improves theoretical temperature combustion by improving the temperature after the latter stage combustion air preheating of burning stove, and then improve
Dome temperature, increases the amount of stored heat of checker brick；
(2) hot-blast stove combustion air timesharing pre-heating system of the invention, passes through the stop valve set on combustion-supporting branch road
The switching of combustion air path is realized, control is easy, using flexible；
(3) application of hot-blast stove combustion air timesharing pre-heating system of the invention is not limited by heat exchanger form, combustion-supporting
Air heat exchanger and gas change heater can use existing various forms of heat exchangers or its combining form, combustion air heat exchange
Device and gas change heater can realize the high efficiente callback of flue gas waste heat；
(4) application of hot-blast stove combustion air timesharing pre-heating system of the invention is not limited by hot-blast stove form, hot blast
Stove can be the multi-forms such as top ignition, external-burning, internal combustion type or pebble stove, hot-blast stove combustion air timesharing preheating system
System strong applicability, is conducive to popularization and application；
(5) hot-blast stove combustion air timesharing pre-heating system of the invention can meet hot-blast stove and be put aside largely initial stage in burning stove
The need for heat, and it can meet the need for stove middle and later periods raising hot-blast stove dome temperature is burnt；Hot-blast stove combustion air timesharing is pre-
Hot systems can make full use of the flue gas waste heat for burning stove different phase, hot-blast stove highest dome temperature be improved, so as to obtain high wind
Temperature, reduces energy resource consumption；The hot-blast stove combustion air timesharing pre-heating system of the present invention is simple in construction, and floor space is small, flexibility
It is high and cost input is relatively low, newly-built hot-blast stove is applicable not only to, hot-blast furnace transformation engineering is applied also for.
Schematical embodiment of the invention is the foregoing is only, the scope of the present invention is not limited to.It is any
Those skilled in the art, made equivalent variations and modification on the premise of the design of the present invention and principle is not departed from,
The scope of protection of the invention should be belonged to.
Claims (10)
1. set at the top of a kind of hot-blast stove combustion air timesharing pre-heating system, including hot-blast stove and combustion fan, the hot-blast stove
Be equipped with gas entry and combustion air inlet, the bottom of the hot-blast stove is provided with flue gas outlet, the flue gas outlet with
The bottom connection of chimney, it is characterised in that the inner chamber bottom of the hot-blast stove is provided with preheating device in combustion air stove, described
Flue gas passage, the combustion fan combustion-supporting air heat-exchange passage and stove in are provided with stove in combustion air stove in preheating device
Outlet can be connected by combustion air heat exchanger with the combustion air inlet, set in the combustion air heat exchanger and help
Air duct and the first flue gas passage are fired, the outlet of the combustion air passage can pass through the first combustion air path or second
Combustion air path is connected with the combustion air inlet, and combustion-supporting air heat-exchange passage concatenation is communicated in described second in the stove
On combustion air path；The top of flue gas passage is connected with the inner chamber of the hot-blast stove in the stove, flue gas in the stove
The bottom of passage and the flue gas outlet, the flue gas outlet can order pass through the first flue gas branch road and described the
One flue gas passage is connected with the bottom of the chimney.
2. hot-blast stove combustion air timesharing pre-heating system as claimed in claim 1, it is characterised in that the gas entry can lead to
Cross gas change heater to connect with blast furnace gas supply line, gas passage and the second flue gas are provided with the gas change heater
Passage, the outlet of the gas passage is connected with the gas entry；The flue gas outlet can also sequentially pass through the second useless cigarette
Gas branch road and the second flue gas passage are connected with the bottom of the chimney.
3. hot-blast stove combustion air timesharing pre-heating system as claimed in claim 2, it is characterised in that the combustion fan goes out
Mouth can also be connected by the combustion air bypass pipe being arranged in parallel with the combustion air heat exchanger with the combustion air inlet,
The gas entry can also be connected by coal gas bypass pipe with the blast furnace gas supply line, and the flue gas outlet can also lead to
Cross and the 3rd flue gas branch road of the first flue gas branch circuit parallel connection setting is connected with the bottom of the chimney.
4. hot-blast stove combustion air timesharing pre-heating system as claimed in claim 1, it is characterised in that the combustion air passage
Entrance and the combustion fan outlet, be serially connected with the first combustion air path on the first combustion air path and cut
Disconnected valve, the second combustion air path includes the first combustion-supporting branch road and the second combustion-supporting branch road, the one of the first combustion-supporting branch road
End and the outlet of the combustion air passage, the other end and the combustion-supporting air heat-exchange in the stove of the first combustion-supporting branch road
One end connection of passage, one end of the second combustion-supporting branch road is connected with the other end of combustion-supporting air heat-exchange passage in the stove,
The other end of the second combustion-supporting branch road is connected with the combustion air inlet.
5. hot-blast stove combustion air timesharing pre-heating system as claimed in claim 4, it is characterised in that first combustion air
The position between outlet and the entrance of the first combustion air path stop valve on path positioned at the combustion air passage
Connection sets one end of the first combustion-supporting branch road, the other end and the combustion-supporting air heat-exchange in the stove of the first combustion-supporting branch road
The first combustion-supporting branch road stop valve is serially connected with one end connection of passage, the first combustion-supporting branch road；The second combustion-supporting branch road
One end is connected with the other end of combustion-supporting air heat-exchange passage in the stove, and described first is located on the first combustion air path
Position between combustion air path stop valve and the combustion air inlet, which is connected, sets the another of the second combustion-supporting branch road
The second combustion-supporting branch road stop valve is serially connected with end, the second combustion-supporting branch road.
6. hot-blast stove combustion air timesharing pre-heating system as claimed in claim 5, it is characterised in that first combustion air
Sequence of positions on path between the other end and the combustion air inlet of the described second combustion-supporting branch road is serially connected with combustion-supporting
Air control valve and combustion air combustion valve.
7. hot-blast stove combustion air timesharing pre-heating system as claimed in claim 3, it is characterised in that the gas passage and institute
Stating sequential concatenation between the outlet of coal gas bypass pipe and the gas entry has gas regulator, gas stop valve and gas-fired
Valve.
8. hot-blast stove combustion air timesharing pre-heating system as claimed in claim 3, it is characterised in that on the coal gas bypass pipe
Being serially connected with can control to distinguish at the first stop valve of the coal gas bypass pipe connected state, the entrance and exit of the gas passage
It is provided with and communicated with the second stop valve and the 3rd stop valve, the entrance and exit of the second flue gas passage and is respectively communicated with setting
There are the 4th stop valve and the 5th stop valve.
9. hot-blast stove combustion air timesharing pre-heating system as claimed in claim 3, it is characterised in that the combustion air bypass
The 6th stop valve of the combustion air bypass pipe connected state can be controlled by being serially connected with pipe, the entrance of the combustion air passage
It is provided with and respectively communicated with exit at the 7th stop valve and the 8th stop valve, the entrance and exit of the first flue gas passage
It is provided with and respectively communicated with the 9th stop valve and the tenth stop valve.
10. hot-blast stove combustion air timesharing pre-heating system as claimed in claim 3, it is characterised in that the flue gas outlet
Place, which is provided with, is serially connected with can control the 3rd flue gas branch road connected state on chimney valve, the 3rd flue gas branch road
11 stop valves.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710383720.4A CN106967861B (en) | 2017-05-26 | 2017-05-26 | Time-sharing preheating system for combustion air of hot blast stove |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710383720.4A CN106967861B (en) | 2017-05-26 | 2017-05-26 | Time-sharing preheating system for combustion air of hot blast stove |
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| CN106967861B CN106967861B (en) | 2022-05-27 |
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| CN201710383720.4A Active CN106967861B (en) | 2017-05-26 | 2017-05-26 | Time-sharing preheating system for combustion air of hot blast stove |
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| CN115751318A (en) * | 2022-11-28 | 2023-03-07 | 中钢设备有限公司 | Gas heating device and method |
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| Publication number | Publication date |
|---|---|
| CN106967861B (en) | 2022-05-27 |
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