A kind of reheat furnace system that utilizes oxygen-enriched combusting
Technical field
The present invention relates to the heating furnace technical field, more particularly, relate to a kind of reheat furnace system that utilizes oxygen-enriched combustion technology.
Background technology
At present, heating furnace is widely used in billet rolling, the forging line.Utilize heating furnace that steel billet is heated, burn till red steel, it is reached satisfy rolling, as to forge needs steel billet temperature, then be rolled or forge.In China, the heating furnace One's name is legion, the traditional heating stove modes that adopt conventional diffusion combustion more, the energy consumption height, seriously polluted.
In recent years, developed regenerative combustion technology at heater for rolling steel, recuperative heater can be applied to heater for rolling steel with iron and steel enterprise's by-product blast furnace gas, has saved high heating value fat coal gas such as natural gas, coke-stove gas, has realized effective utilization of by-product blast furnace gas.But still there are many shortcomings in recuperative heater: (1) power consumption is higher, a large amount of electric energy of its hold over system reversal valve frequent operation consumption, and the more powerful air-introduced machine of system configuration also consumes a large amount of electric energy; (2) reversal valve, heat storage weak point in service life are changed frequently, have increased production cost, have reduced operational use time; (3) CO content is higher in the smoke evacuation, the coal gas side smoke evacuation of especially two thermal storage heating stoves, and its CO content is up to several thousand ppm, and is local even surpass 10,000 ppm, serious environment pollution.
Summary of the invention
The technical problem to be solved in the present invention is, the reheat furnace system that utilizes oxygen-enriched combustion technology of a kind of burning highly effective, energy-conserving and environment-protective is provided, and can realize effective utilization of low-heat value gas.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of reheat furnace system that utilizes oxygen-enriched combusting, comprise the gaspipe line system, combustion-supporting air pipe system, gas change heater, combustion-supporting gas heat exchanger, combustion system and body of heater, described combustion system comprises oxygen-enriched burner, help gas control valve, gas regulator and control system, feed in the oxygen-enriched burner after the coal gas process gas change heater preheating that the gaspipe line system feeds, the combustion-supporting gas that combustion-supporting air pipe system feeds feeds in the oxygen-enriched burner, by the described gas control valve that helps after through the preheating of combustion-supporting gas heat exchanger, gas regulator and burner control system are regulated the infeed flow of coal gas and combustion-supporting gas.
In the reheat furnace system that utilizes oxygen-enriched combusting of the present invention, described gaspipe line system comprises gaspipe line and is arranged on gas valve on the described gaspipe line that described gaspipe line is connected with described gas change heater.
In the reheat furnace system that utilizes oxygen-enriched combusting of the present invention, described combustion-supporting air pipe system comprises combustion-supporting air pipe and first oxygen valve, second oxygen valve and the air door that are connected with described combustion-supporting air pipe respectively, described first oxygen valve is connected with the oxygen pipe network, described second oxygen valve is connected with the oxygenerator group, and described air door is connected with combustion fan.
In the reheat furnace system that utilizes oxygen-enriched combusting of the present invention, the oxygen concentration scope of carrying in the described combustion-supporting air pipe system is 21~60%.
In the reheat furnace system that utilizes oxygen-enriched combusting of the present invention, described body of heater is provided with flue, and described gas change heater and combustion-supporting gas heat exchanger are connected with described flue.
In the reheat furnace system that utilizes oxygen-enriched combusting of the present invention, described combustion-supporting gas heat exchanger is pipe heat exchanger, plate type heat exchanger or heat exchange of heat pipe.
In the reheat furnace system that utilizes oxygen-enriched combusting of the present invention, described gas change heater be pipe heat exchanger, plate type heat exchanger or heat exchange of heat pipe.
In the reheat furnace system that utilizes oxygen-enriched combusting of the present invention, the coal gas that feeds in the described gaspipe line system is mixed gas, coal gas of converter or blast furnace gas.
In the reheat furnace system that utilizes oxygen-enriched combusting of the present invention, described body of heater is heater for rolling steel, rotary heating furnace or forge furnace.
Implement the reheat furnace system that the present invention utilizes oxygen-enriched combusting, have following beneficial effect:
1, the present invention adopts oxygen-enriched combustion technology, efficient more, energy-saving and environmental protection.
2, utilize oxygen-enriched combusting and combustion-supporting gas, gas double pre-heating mode that low-heat value gas such as blast furnace gas, coal gas of converter, mixed gas are applied to the heating furnace burning, realize effective utilization of steel plant's by-product low-heat value gas, save high heating value fat coal gas such as natural gas, coke-stove gas.
3, the present invention utilizes the reheat furnace system of oxygen-enriched combusting simple, low cost of manufacture, and production stability is good.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the structural representation that the present invention utilizes the reheat furnace system of oxygen-enriched combusting.
The specific embodiment
Understand for technical characterictic of the present invention, purpose and effect being had more clearly, now contrast accompanying drawing and describe the specific embodiment of the present invention in detail.
As shown in Figure 1, the present invention utilizes the reheat furnace system of oxygen-enriched combusting to comprise gaspipe line system, combustion-supporting air pipe system, gas change heater 12, combustion-supporting gas heat exchanger 13, combustion system and body of heater 14.
Combustion system comprises oxygen-enriched burner 15, helps gas control valve 16, gas regulator 17 and control system.Feed in the oxygen-enriched burner 15 after coal gas process gas change heater 12 preheatings that feed in the gaspipe line system, coal gas can be low-heat value gas such as mixed gas, coal gas of converter or blast furnace gas.The combustion-supporting gas that combustion-supporting air pipe system feeds is through feeding in the oxygen-enriched burner 15 after combustion-supporting gas heat exchanger 13 preheatings, and combustion-supporting gas is oxygen-enriched air.Coal gas and combustion-supporting gas mix after-combustion in oxygen-enriched burner 15.Regulate the infeed flow of coal gas and combustion-supporting gas by helping gas control valve 16, gas regulator 17 and burner control system.Every heating furnace arranges the number of oxygen-enriched burner 15 and determines according to heating furnace production capacity and body of heater 14 sizes.Body of heater 14 can be the heating furnace of various steel billets such as heater for rolling steel, rotary heating furnace or forge furnace, steel part.
The present invention utilizes coal gas in the reheat furnace system of oxygen-enriched combusting, the two preheatings of combustion-supporting gas, and the burning form is oxygen-enriched combusting, can improve the ignition temperature of coal gas and the radiation intensity of flue gas, has characteristics such as efficient, energy-conservation, low-nitrogen oxide discharging.According to heating furnace technology needs, rational coal gas, combustion-supporting gas preheat temperature are set, ignition temperature and gas radiation intensity that rational combustion-supporting gas oxygen concentration can improve low-heat value gas such as blast furnace gas, coal gas of converter are set, thereby steel plant's by-product low-heat value gas such as blast furnace gas, coal gas of converter can be applied in the heating furnace, realize efficient application and the energy-saving and emission-reduction of steel plant's by-product low-heat value gas.
Further, the gaspipe line system comprises gaspipe line 8 and the gas valve 9 that is arranged on the gaspipe line 8, and gaspipe line 8 is connected with gas change heater 12.Gaspipe line 8 is connected with gaspipe network 10.Coal gas is heated in gas change heater 12 more than 200 ℃, supplies in the combustion system through gaspipe line 8 then.
Further, combustion-supporting air pipe system comprises combustion-supporting air pipe 7 and first oxygen valve 2 that is connected with combustion-supporting air pipe 7 respectively, second oxygen valve 6 and air door 3, first oxygen valve 2 is connected with oxygen pipe network 1, second oxygen valve 6 is connected with oxygenerator group 5, and air door 3 is connected with combustion fan 4.Producing the oxygen of oxygen-enriched air can supply with by oxygen pipe network 1, also can produce by oxygenerator group 5 is set.Oxygen mixes in pipeline with the air that combustion fan 4 is supplied with, and obtains oxygen-enriched air.Combustion-supporting air pipe system comprises first oxygen valve 2, oxygenerator group 5, second oxygen valve 6, air door 3, combustion fan 4 and combustion-supporting air pipe 7.Oxygen-enriched air is as the combustion-supporting gas of burning, and the oxygen of oxygenerator group 5 or oxygen pipe network 1 mixes in pipeline with the air that combustion fan 4 is supplied with, and obtains oxygen-enriched air.Combustion-supporting gas feeds in the combustion-supporting gas heat exchanger 13 through combustion-supporting air pipe 7, and combustion-supporting gas is heated to more than 300 ℃ in combustion-supporting gas heat exchanger 13, supplies in the combustion system through combustion-supporting air pipe 7 then.
Further, the oxygen concentration scope of carrying in the combustion-supporting air pipe system is 21~60%, can improve ignition temperature and the gas radiation intensity of low-heat value gas such as blast furnace gas, coal gas of converter greatly.
Further, body of heater 14 is provided with flue 11, and gas change heater 12 and combustion-supporting gas heat exchanger 13 are connected with flue 11.Discharging flue gas from body of heater 14 at first is preheated to combustion-supporting gas more than 300 ℃ by combustion-supporting gas heat exchanger 13, then by gas change heater 12 with more than the gas preheating to 200 ℃, temperature is down to below 300 ℃ after the heat exchange of flue gas process two-stage, discharges through air-introduced machine or chimney, has reduced thermal pollution.
Further, combustion-supporting gas heat exchanger 13 and gas change heater 12 are the heat exchanger of forms such as pipe heat exchanger, plate type heat exchanger or heat exchange of heat pipe.
By reference to the accompanying drawings embodiments of the invention are described above; but the present invention is not limited to the above-mentioned specific embodiment; the above-mentioned specific embodiment only is schematic; rather than it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; not breaking away under the scope situation that aim of the present invention and claim protect, also can make a lot of forms, these all belong within the protection of the present invention.