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CN-121977208-A - Low smoke temperature radiant tube combustor

CN121977208ACN 121977208 ACN121977208 ACN 121977208ACN-121977208-A

Abstract

The invention discloses a low-smoke-temperature radiant tube burner, which relates to the technical field of gas combustion and comprises a burner shell, wherein an outer end flange and an inner end flange are respectively fixed at two ends of the burner shell, a combustion air inlet is formed in the burner shell, a secondary heat exchanger is arranged in the burner shell, a primary heat exchanger and a primary heat exchanger air duct are fixedly sleeved in the secondary heat exchanger, the primary heat exchanger is sleeved outside the primary heat exchanger air duct, a combustion mechanism is arranged in the primary heat exchanger air duct, and air holes are formed at the outer ends of the primary heat exchanger air duct.

Inventors

  • HUANG CHENGXIN

Assignees

  • 佛山市精燃机电设备有限公司

Dates

Publication Date
20260505
Application Date
20260318

Claims (10)

  1. 1. The utility model provides a low smoke temperature radiant tube combustor which is characterized in that, including nozzle shell (1), the both ends of nozzle shell (1) are fixed with outer end flange (2) and inner end flange (3) respectively, combustion air entry (4) have been seted up on nozzle shell (1), be equipped with second grade heat exchanger (8) in nozzle shell (1), second grade heat exchanger (8) internal fixation cover has one-level heat exchanger air duct (5) and one-level heat exchanger (6), one-level heat exchanger (6) cover is in outside one-level heat exchanger air duct (5), be equipped with combustion mechanism in one-level heat exchanger air duct (5), gas pocket (7) have been seted up to the outer end of one-level heat exchanger air duct (5); The secondary heat exchanger (8) comprises a secondary heat exchanger outer cylinder wall (9), a secondary heat exchanger inner cylinder wall (10), an outer end cover plate (11) and an inner end cover plate (12), a plurality of heat exchange tubes (13) which are not contacted with each other are arranged in the secondary heat exchanger (8), two ends of each heat exchange tube (13) are respectively fixed on the outer end cover plate (11) and the inner end cover plate (12), through holes (14) penetrating through the heat exchange tubes (13) are formed in the outer end cover plate (11) and the inner end cover plate (12), a gap I (15) is reserved between the outer end cover plate (11) and the outer end flange (2), a gap II (16) is reserved between the inner end cover plate (12) and the inner end flange (3), the inner end of the secondary heat exchanger outer cylinder wall (9) is sealed and fixed on the periphery of the inner end cover plate (12), the outer end of the secondary heat exchanger outer cylinder wall (9) is sealed and fixed on the periphery of the outer end cover plate (11) and extends outwards, the inner end cover plate (2) is fixed on the inner end flange (2) and the inner end flange (3) is sealed and fixed on the outer end flange (3), the outer end of the inner cylinder wall (10) of the secondary heat exchanger is not in contact with the outer end cover plate (11) and a gap III (17) is reserved between the outer end cover plate (11), the inner end of the primary heat exchanger (6) extends out of the burner shell (1) and the outer end of the primary heat exchanger is sealed and fixed on the outer end cover plate (11), a gap IV (18) is reserved between the primary heat exchanger (6) and the inner cylinder wall (10) of the secondary heat exchanger, and a smoke outlet (19) is formed in the outer cylinder wall (9) of the secondary heat exchanger and a gap V (20) is reserved between the burner shell (1).
  2. 2. A low smoke temperature radiant tube burner according to claim 1, wherein a plurality of heat exchanging tubes (13) are divided into a plurality of groups, each group of heat exchanging tubes (13) is distributed in a ring shape, the rings of the plurality of groups of heat exchanging tubes (13) are concentric with the outer end cover plate (11) and the inner end cover plate (12), and the diameters of the rings of the plurality of groups of heat exchanging tubes (13) are different.
  3. 3. The low-smoke-temperature radiant tube burner according to claim 2, wherein a plurality of annular guide plates (21) are arranged in the secondary heat exchanger (8), the guide plates (21) are perpendicular to the heat exchange tube (13) and sleeved on the heat exchange tube (13), the guide plates (21) comprise large-ring guide plates (211) and small-ring guide plates (212), the outer periphery of the large-ring guide plates (211) is sealed and fixed on the inner wall of the outer cylinder wall (9) of the secondary heat exchanger, the inner periphery of the small-ring guide plates (212) is sealed and fixed on the inner wall of the inner cylinder wall (10) of the secondary heat exchanger, the outer periphery of the small-ring guide plates (212) is not contacted with the outer cylinder wall (9) of the secondary heat exchanger, and the large-ring guide plates (211) and the small-ring guide plates (212) are alternately arranged along the length direction of the heat exchange tube (13).
  4. 4. A low smoke temperature radiant tube burner according to claim 1, wherein said smoke outlet (19) is provided in the outer tube wall (9) of said secondary heat exchanger near the inner end.
  5. 5. A low smoke-temperature radiant tube burner according to claim 1, wherein said combustion air inlet (4) is provided at a position of said burner housing (1) close to the outer end.
  6. 6. A low smoke temperature radiant tube burner according to claim 1, wherein the inner end of the primary heat exchanger (6) is fixed with an end cap (25), said end cap (25) is arranged outside the inner end of the primary heat exchanger air duct (5), a gap six (26) is arranged between the primary heat exchanger (6) and the primary heat exchanger air duct (5), said gap six (26) being in communication with said gap one (15).
  7. 7. The low-smoke-temperature radiant tube burner according to claim 1, wherein the primary heat exchanger (6) comprises a fin heat exchange part (61) and a straight tube heat exchange part (62), one end of the straight tube heat exchange part (62) is fixed on the outer end cover plate (11), the other end of the straight tube heat exchange part is fixedly connected with the fin heat exchange part (61), the fin heat exchange part (61) extends out of the burner housing (1), a plurality of annularly distributed heat exchange fins (63) are arranged on the outer wall of the fin heat exchange part (61), and the heat exchange fins (63) are used for increasing the heat exchange area of gas.
  8. 8. The low smoke temperature radiant tube burner of claim 7, wherein said fin heat exchanging portion (61) comprises a plurality of fin tube units (64), said fin tube units (64) comprise tube body portions (641), said tube body portions (641) are provided with a plurality of heat exchanging fins (63) parallel to each other, said heat exchanging fins (63) comprise a first straight line portion (631), a fold line portion (632) and a second straight line portion (633) which are integrally formed, and adjacent fin tube units (64) are fixedly connected.
  9. 9. A low smoke temperature radiant tube burner according to claim 1, wherein the inner end of the primary heat exchanger (6) is fixed with an end cap (25), the combustion mechanism comprises a mixed combustion chamber (27), an ignition electrode (28) and a gas pipe (29), the mixed combustion chamber (27) is inserted on the end cap (25), the outer end of the ignition electrode (28) extends out of the primary heat exchanger air conduit (5) and the inner end extends into the mixed combustion chamber (27), the outer end of the gas pipe (29) extends out of the primary heat exchanger air conduit (5) and the inner end faces the inlet of the mixed combustion chamber (27).
  10. 10. A low smoke temperature radiant tube burner according to claim 9, wherein said mixing combustion chamber (27) comprises a nozzle (271) and a guide flame cone (272), said nozzle (271) outlet end being secured to said end cap (25), said guide flame cone (272) having a larger open end fitting within said nozzle (271) inlet end but not contacting said nozzle (271) inlet end and being secured to said nozzle (271) inlet end by fasteners.

Description

Low smoke temperature radiant tube combustor Technical Field The invention relates to the technical field of gas combustion, in particular to a low-smoke-temperature radiant tube burner. Background The radiant tube is a heating device which seals the heating facilities in the protective sleeve and indirectly radiates heat to the furnace lining and the workpiece through the sleeve. Radiant tube burners are generally classified into self-preheating type radiant tube burners and non-self-preheating type radiant tube burners. The self-preheating radiant tube burner integrates the burner and the heat exchanger, and combustion air enters the burner and then exchanges heat with high-temperature flue gas through the heat exchanger integrated by the burner, and is mixed with fuel gas and ignited for combustion after being preheated, so that heat recovery is realized. The heat exchanger is one of the important components of the self-preheating radiant tube burner, and the comprehensive performance requirement is that the highest possible air preheating temperature and lowest possible smoke emission temperature are achieved under normal working conditions. In conventional industrial applications, when kiln operating temperatures are high (e.g., 900 ℃) the flue gas emission temperature is high, typically above 450 ℃, with individual furnaces exceeding 600 ℃. The high-temperature flue gas takes away a large amount of heat generated by combustion of the fuel gas, so that the heat efficiency of the kiln is reduced, and the energy-saving effect is not achieved. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide a low-smoke-temperature radiant tube burner, which solves the problems of high smoke discharge temperature and energy saving. The invention adopts the following technical scheme: The low-smoke-temperature radiant tube burner comprises a burner shell, wherein an outer end flange and an inner end flange are respectively fixed at two ends of the burner shell, a combustion air inlet is formed in the burner shell, a secondary heat exchanger is arranged in the burner shell, a primary heat exchanger air duct and a primary heat exchanger are fixedly sleeved in the secondary heat exchanger, the primary heat exchanger is sleeved outside the primary heat exchanger air duct, a combustion mechanism is arranged in the primary heat exchanger air duct, and an air hole is formed in the outer end of the primary heat exchanger air duct; The secondary heat exchanger comprises a secondary heat exchanger outer cylinder wall, a secondary heat exchanger inner cylinder wall, an outer end cover plate and an inner end cover plate, a plurality of heat exchange pipes which are not in contact with each other are arranged in the secondary heat exchanger, two ends of the heat exchange pipes are respectively fixed on the outer end cover plate and the inner end cover plate, through holes penetrating through the heat exchange pipes are formed in the outer end cover plate and the inner end cover plate, a first gap is reserved between the outer end cover plate and the outer end flange, a second gap is reserved between the inner end cover plate and the inner end flange, the inner end of the secondary heat exchanger outer cylinder wall is fixed on the periphery of the inner end cover plate in a sealing mode, the outer end of the secondary heat exchanger outer cylinder wall is fixed on the periphery of the outer end cover plate in a sealing mode, extends outwards and is fixed on the outer end flange, the inner end of the secondary heat exchanger inner cylinder wall is fixed on the inner end cover plate in a sealing mode, the outer end of the secondary heat exchanger inner cylinder wall is not in contact with the outer end cover plate, a third gap is reserved between the outer end cover plate and the outer end cover plate, a gap is reserved between the secondary heat exchanger outer cylinder wall and the outer cylinder wall is reserved, and the outer cylinder wall is provided with a fifth gap between the outer cylinder wall and the outer cylinder wall is reserved, and the outer cylinder wall is fixed on the outer cylinder wall. Further, the heat exchange tubes are divided into a plurality of groups, each group of heat exchange tubes is distributed in an annular shape, the annular shape of the distribution of the plurality of groups of heat exchange tubes is concentric with the outer end cover plate and the inner end cover plate, and the diameters of the annular shapes of the distribution of the plurality of groups of heat exchange tubes are different. Further, be equipped with a plurality of annular guide plates in the second grade heat exchanger, the guide plate perpendicular to the heat exchange tube just overlaps and establishes on the heat exchange tube, the guide plate includes macrocyclic guide plate and little ring guide plate, the periphery of macrocyclic guide plate is sealed to be fixed on the inner wall