Disclosure of Invention
Objects of the invention
The large-flow indirect heat exchange type high-temperature and high-pressure hot blast stove provided by the invention has the advantages of reasonable structure, high heat energy utilization rate, capability of efficiently and quickly obtaining high-temperature air, safety, environmental friendliness, great reduction in use cost and improvement on the overall economy of equipment.
(II) technical scheme
The invention provides a high-flow indirect heat exchange type high-temperature and high-pressure hot blast stove which comprises a stove body, an air inlet collecting pipe, an air outlet collecting pipe, a middle collecting pipe, a burner, a chimney, a fin tube bundle and a light tube, wherein the middle collecting pipe is arranged in the stove body;
an inner wall is arranged in the furnace body; the inner wall is vertically distributed and used for dividing the interior of the furnace body into a low-temperature bin and a high-temperature bin, and a ventilation opening for allowing high-temperature flue gas in the high-temperature bin to flow into the low-temperature bin is reserved between the inner wall and the inner wall of the furnace body;
the chimney is connected with the furnace body, and the interior of the chimney is communicated with the interior of the low-temperature bin;
the high-temperature bin is provided with a mounting hole on the inner wall of the furnace body far away from the ventilation opening; the burner is connected with the furnace body, and a burner head of the burner passes through the mounting hole and extends into the high-temperature bin;
the finned tube bundle is connected with the inner wall of the low-temperature bin, a plurality of air inlet ends of the finned tube bundle are communicated with the air inlet collecting pipe, and a plurality of air outlet ends of the finned tube bundle are communicated with the middle collecting pipe;
the light pipes are evenly distributed side by side, the light pipes are all connected with the inner wall of the high-temperature bin, the air inlet ends of the light pipes are all communicated with the middle collecting pipe, and the air outlet ends of the light pipes are all communicated with the air outlet collecting pipe.
Preferably, the inner wall is built by refractory bricks.
Preferably, the furnace body comprises a base, four side walls and a top cover;
the lower end faces of the four side walls are respectively connected with the four right-angle sides of the base, the four side walls are sequentially connected, and the upper end faces of the four side walls are connected with the top cover.
Preferably, the base, the four side walls and the top cover are all built by refractory bricks.
Preferably, the outer sides of the base, the four side walls and the top cover are all provided with heat insulation layers; the outside of heat preservation all is equipped with the back up coat.
Preferably, the heat-insulating layer is formed by covering a ceramic fiber board heat-insulating material on the outer side of the base, the outer side of the side wall or the outer side of the top cover; the thickness covered by the ceramic fiber board heat-insulating material is 130-170 mm.
Preferably, the reinforcing layer is made of a printed decorative steel plate; the thickness of the printing decorative steel plate is 0.5 mm.
Preferably, the finned tube bundle comprises a plurality of finned tubes and helical band fins;
the projection shape of each finned tube is snakelike, a plurality of finned tubes are communicated with the air inlet header and the middle header respectively, the plurality of finned tubes are arranged side by side at equal intervals and are connected with helical band fins.
Preferably, the plurality of finned tubes and the helical fins are made of 304 stainless steel.
Preferably, the projection shape of each light pipe is a serpentine shape, and each light pipe is made of 310S stainless steel.
Compared with the prior art, the technical scheme of the invention has the following beneficial technical effects:
the interior of the furnace body is divided into a high-temperature bin and a low-temperature bin, and high-temperature flue gas flowing towards the low-temperature bin along the high-temperature bin and cold air exchange heat in an integral countercurrent flow mode; the heat exchange is carried out in the high-temperature bin by adopting a 310S stainless steel light pipe bundle with good temperature resistance, and the heat exchange is carried out in the low-temperature bin by adopting a common 304 stainless steel fin pipe bundle, so that not only is the heat energy of high-temperature flue gas in the high-temperature bin fully utilized, but also the heat exchange area is increased by utilizing the spiral belt fins 12 arranged in the low-temperature bin, the utilization rate of the heat energy is improved, the high heat exchange quantity is achieved, and finally, large-flow high-temperature high-pressure clean air at the temperature of 600-700 ℃ is obtained in the air outlet collecting pipe;
the hot blast stove provided by the invention has a simple and novel structural form, can adapt to high-pressure media, can greatly improve the utilization rate of heat energy, can ensure that the heated air can reach 600-700 ℃, is safe and environment-friendly, greatly reduces the use cost, improves the overall economy of equipment, and is worthy of popularization.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
As shown in fig. 1-3, the high-flow indirect heat exchange type high-temperature high-pressure hot blast stove provided by the invention comprises a stove body, an air inlet manifold 4, an air outlet manifold 5, an intermediate manifold 6, a burner 7, a chimney 8, a finned tube bundle 9 and a light pipe 13;
an inner wall 3 is arranged in the furnace body; the inner wall 3 is vertically distributed and used for dividing the interior of the furnace body into a low-temperature bin 14 and a high-temperature bin 15, and a ventilation opening for allowing high-temperature flue gas in the high-temperature bin 15 to flow into the low-temperature bin 14 is reserved between the inner wall 3 and the inner wall of the furnace body;
it should be noted that the ventilation opening is reserved for forcing the hot flue gas flow in the high-temperature bin 15 to turn 180 degrees at the end of the inner wall 3 to form two return flows;
the chimney 8 is connected with the furnace body, and the interior of the chimney 8 is communicated with the interior of the low-temperature bin 14;
further, the chimney 8 is vertical to the upper end surface of the furnace body and is positioned on one side far away from the ventilation opening; the flue gas flowing into the chimney 8 can be directly discharged through the chimney 8, and can also flow into other smoke exhaust air channels through the chimney 8;
the high-temperature bin 15 is provided with a mounting hole on the inner wall of the furnace body far away from the ventilation opening;
furthermore, the inner diameter of the high-temperature bin 15 along the gas flowing direction is gradually increased to form an expanded horn-shaped structure, so that the high-temperature flue gas generated by the combustor 7 can be conveniently and preliminarily diffused;
the burner 7 is connected with the furnace body, and the burning head of the burner 7 passes through the mounting hole and extends into the high-temperature bin 15;
further, the combustor 7 is selected from but not limited to an oil-fired combustor or a gas-fired combustor, and the combustor 7 has a proportion adjusting function so as to conveniently adjust the heat supply amount according to the requirement;
the finned tube bundle 9 is connected with the inner wall of the low-temperature bin 14, a plurality of air inlet ends of the finned tube bundle 9 are communicated with the air inlet collecting pipe 4, and a plurality of air outlet ends of the finned tube bundle 9 are communicated with the middle collecting pipe 6;
the plurality of light pipes 13 are uniformly distributed in parallel, the plurality of light pipes 13 are connected with the inner wall of the high-temperature bin 15, the air inlet ends of the plurality of light pipes 13 are communicated with the middle header 6, and the air outlet ends of the plurality of light pipes 13 are communicated with the air outlet header 5;
furthermore, the air inlet manifold 4, the air outlet manifold 5 and the middle manifold 6 are all positioned at the outer side of the furnace body, and heat insulation layers are arranged at the outer sides of the air inlet manifold 4, the air outlet manifold 5 and the middle manifold 6.
In one embodiment of the invention, when in use, the combustor 7 combusts fuel to generate high-temperature flue gas in a high-temperature area, and the high-temperature flue gas flows along the directions of the high-temperature bin 15, the low-temperature bin 14 and the chimney 8; the external clean cold air enters the finned tube bundle 9 from the air inlet header 4, the finned tube bundle 9 is arranged in the low-temperature bin 14, and the low-temperature air flowing through the finned tube bundle 9 through heat exchange is heated by the low-temperature flue gas in the low-temperature bin 14; the heated air enters the middle header 6 and then enters the plurality of light tubes 13, the plurality of light tubes 13 are arranged in the high-temperature bin 15, the high-temperature flue gas in the high-temperature bin 15 heats the low-temperature air in the plurality of light tubes 13, and the heated high-temperature flue gas flows out of the air outlet header 5.
In an alternative embodiment, the inner wall 3 is made of refractory bricks; the interior wall 3 built by the refractory bricks has stable structure and good high temperature resistance.
In an optional embodiment, the furnace body comprises a base 1, four side walls and a top cover;
the lower end faces of the four side walls 2 are respectively connected with four right-angle sides of the base 1, the four side walls 2 are sequentially connected, and the upper end faces of the four side walls 2 are connected with the top cover.
In an alternative embodiment, the base 1, the four side walls and the top cover are all made of refractory bricks.
In an optional embodiment, the outer sides of the base 1, the four side walls and the top cover are all provided with heat-insulating layers so as to improve the heat-insulating property of the furnace body;
the outside of heat preservation all is equipped with the back up coat.
In an optional embodiment, the heat-insulating layer is formed by covering ceramic fiber board heat-insulating materials on the outer side of the base 1 or the outer side of the side wall or the outer side of the top cover; the thickness covered by the ceramic fiber board heat-insulating material is 130-170 mm.
In an alternative embodiment, the reinforcing layer is made of a printed decorative steel plate; the thickness of the printing decorative steel plate is 0.5 mm.
In an alternative embodiment, the finned tube bundle 9 comprises a plurality of finned tubes 11 and spiral-finned tubes 12;
the projection shape of each finned tube 11 is snake-shaped, each finned tube 11 is made by bending a tube through a tube bending machine, and each finned tube 11 is made into snake-shaped shape so as to improve the flowing time of air in each finned tube 11 and improve the effect of preheating the air;
the finned tubes 11 are respectively communicated with the air inlet manifold 4 and the middle manifold 6, the finned tubes 11 are arranged side by side at equal intervals, and the finned tubes 11 are connected with helical fins 12;
further, a plurality of finned tubes 11 are connected with helical fins 12 in a laser welding mode; the fin tubes 11 are connected by the helical band fins 12 to improve the efficiency of heat energy exchange in the low temperature bin 14.
In an alternative embodiment, the plurality of fin tubes 11 and the helical fins 12 are made of 304 stainless steel;
wherein the pipe diameter of each finned tube 11 is 40mm, the wall thickness is 4mm, the diameter of the elbow is 100mm, and 16 straight tube sections and 15 elbows are selected and selected but not limited;
the thickness of the spiral band fin 12 is 0.6mm, the height of the fin is 14mm, and the fin interval is 3.5 mm.
In an alternative embodiment, the projection shape of each light pipe 13 is a serpentine shape, each light pipe 13 is made of 310S stainless steel, and each light pipe 13 is made into a serpentine shape, so as to increase the time for air to flow through each light pipe 13, thereby increasing the heating effect on the air;
wherein, the pipe diameter of each light pipe 13 is 40mm, the wall thickness is 4mm, the elbow diameter is 100mm, the total 10 straight pipe sections, 9 elbows of chooseing but not limiting to select.
The application examples of the large-flow indirect heat exchange type high-temperature high-pressure hot blast stove for practical application provided by the invention are as follows:
the furnace body of the large-flow indirect heat exchange type high-temperature and high-pressure hot blast furnace has the length of 2.7m, the width of 1.75m and the height of 0.9 m;
the high-flow high-pressure clean air with the mass flow of 0.4kg/s, the pressure of 0.5MPa and the temperature of 20 ℃ indirectly exchanges heat with high-temperature flue gas with the temperature of about 1200 ℃ generated in the furnace body by an oil burner with the theoretical power upper limit of 450 kW;
the high-temperature flue gas with the temperature of 1200 ℃ is cooled to about 1000 ℃ after passing through a horn-shaped expansion section in a high-temperature bin 15, then is sequentially contacted with a plurality of light tubes 13 in the high-temperature bin 15 and a fin tube bundle 9 in a low-temperature bin 14 for heat exchange, and finally waste flue gas with the temperature of about 300 ℃ is discharged from a chimney 8;
after the total countercurrent heat exchange of the clean air and the hot flue gas at normal temperature, the temperature is raised to 650 ℃, the clean air flows to a subsequent test section through an air outlet header pipe 5, and the test shows that the total pressure loss of the air is not more than 10 kPa; in addition, after the base 1, the side wall 2 and the outer side of the top cover are covered with heat insulation materials with the thickness of 150mm, the temperature of the outer surface of the furnace body is not more than 70 ℃, and scalding to users can not be caused obviously.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.