Regenerative hot rolled strip heating furnace and slab heating process
The invention provides a regenerative hot rolled strip heating furnace and a slab heating process, belonging to the technical field of regenerative heating furnace equipment and slab heating processes. The heating furnace and the slab heating process are used for heating slabs. According to the technical scheme, the heating furnace is characterized in that a hearth of the heating furnace is provided with a first heating zone, a second heating zone and a soaking zone; each heating zone adopts an air-gas double regenerative burner structure; the hearth temperature of the first heating zone is 1150-1200 DEG C and the heating load of the first heating zone is 40-50% of the rated load; the hearth temperature of the second heating zone is maintained at 1250-1280 DEG C and the heating load of the second heating zone is 40-50% of the rated load; the furnace temperature of the soaking zone is 1230-1250 DEG C and the heating load of the soaking zone is 15-20% of the rated load. By adopting the heating furnace, the project investment and the gas consumption can be reduced, the oxidation losses of the slabs can be reduced and the yield of the roll steel can be increased, so that the heating furnace has huge economic benefits. NOx in the combustion products is nearly zero, so that the heating furnace has great social benefits. 1. A heat accumulating type hot-rolled strip steel heating furnace, characterized in that the inner edge of the hearth furnace of the heating furnace of a long direction of the heating section, the heating section is divided into 1st (7), 2nd heating section (8), are heat section (9), each heating section are respectively provided with upper and lower two layers of heating layer, the heating of each heating section of the double heat storage air and coal gas heat accumulating type burner nozzle structure, including the air regenerative burners and gas regenerative type burner, heat accumulating type burner is arranged inside the ceramic heat storage body, air regenerative burners and gas burner nozzle is placed at intervals, air regenerative burners and gas burner nozzle are respectively provided with the front end of the air nozzle and the gas nozzle, air regenerative burners and gas regenerative type burner is respectively connected with the air duct and is connected with the gas pipeline. 2. Heat accumulating hot-rolled strip steel heating furnace according to Claim 1, characterized in that the heating section 1st (7) air regenerative burners and gas regenerative type burner air nozzle and the gas nozzle is a circular, air nozzle and the gas nozzle and the slab (4) is the distance between the 600-700mm, 2nd heating section (8) air regenerative burners and gas regenerative type burner air nozzle and the gas nozzle is elliptical, air nozzle and the gas nozzle and the slab (4) is the distance between the 750-850mm, soaking section (9) of the air regenerative burners and gas regenerative type burner air nozzle and the gas nozzle is long ellipse, air nozzle and the gas nozzle and the slab (4) is the distance between the 800-1000mm. 3. Heat accumulating hot-rolled strip steel heating furnace according to Claim 2, characterized in that the effective length of the of the heating stove for 26-30 meters, heating furnace each of the two sides of the heating section of heat accumulating type burner are respectively connected with a periodic reversing the heat accumulating type burner three-way reversing valve (10). 4. A kind of using the above-mentioned heat-accumulating the hot-rolled strip steel slab heating process of the heating furnace, characterized in that it adopts the following process: Slab (4) directly enter into the heating furnace from the charging of the main body (1) of the heating section 1st (7), 1st heating section (7) of the temperature of the hearth the 1150-1200 [...] , its heating load is the rated load of the 40-50% ; slab (4) from the 1st heating section (7) into the 2nd heating section (8), 2nd heating section (8) of the temperature of the hearth the 1250-1280 [...] , its heating load is the rated load of the 40-50% ; slab (4) from the 2nd heating section (8) enter the soaking section (9), are heat section (9) of the furnace the 1230-1250 [...] , of the blank than the final high temperature tapping the 30-50 [...] , slab (4) in section (9) for temperature equalization process the major, narrow slab (4) the temperature difference between the surface and the centre, and at the end thereof, the temperature difference to control the 30 within [...] , its heating load is the rated load of the 15-20%. 5. Heat accumulating hot-rolled strip steel slab heating process of the heating furnace according to Claim 4, characterized in that the maximum heating load of the heating stove is rated heating load of 1.2 times, on each heating section of the heating layer and the heating load of the heating distribution ratio of 45:55. 6. Heat accumulating hot-rolled steel strip according to Claim 5 slab heating process of the heating furnace, characterized in that the slab (4) in the thickness direction of the slab (4) of the unit the heating time is 3.5-4.0 minutes/cm. 7. Heat accumulating hot-rolled steel strip according to Claim 6 of slab heating process of the heating furnace, characterized in that the heating section 1st (7) the two sides of the 2nd heat accumulating type burner nozzle and heating section (8) of the two sides of the heat accumulating type burner nozzle are in two side reversing combustion, by the heat accumulating type burner three-way reversing valve (10) regularly switching, to the commutation cycle 50-60 seconds.