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CN-224229999-U - Low-nitrogen combustor suitable for multiple working conditions

CN224229999UCN 224229999 UCN224229999 UCN 224229999UCN-224229999-U

Abstract

The utility model discloses a low-nitrogen burner suitable for multiple working conditions, which mainly comprises a fire basin brick, an outer-layer gas gun, a cylinder, a damper, a gas-liquid split combined spray gun and the like, wherein the cylinder is of a hollow cup-shaped structure, a heat insulation layer is arranged in the cylinder, the fire basin brick is a fireproof prefabricated member and is provided with a U-shaped notch, the fire basin brick is arranged at the top end of the cylinder and is used for guiding flame and combustion air, the outer-layer gas gun is uniformly distributed along the fire basin brick, the gas-liquid split combined spray gun is connected through a metal hose and ejects graded fuel gas to eject flue gas in a furnace so as to reduce NOx generation, the gas-liquid split combined spray gun integrates a central liquid guide spray gun and an inner-layer gas gun, gas-liquid fuel is separated and respectively ejected, the gas-liquid fuel is mixed with swirling combustion air, a central swirling sleeve forms high-speed swirling air through a swirling sheet, fuel mixing is enhanced, and a pilot lamp provides continuous fire source security. The burner realizes high-efficiency low-nitrogen emission through staged combustion, flue gas recirculation and cyclone combustion-supporting air technology.

Inventors

  • LUO YINGBO
  • YOU SHUHUAI
  • CHEN XI
  • Liang Aoqin
  • TANG FULI
  • ZHONG YIHANG

Assignees

  • 湖南钟鼎热工科技股份有限公司

Dates

Publication Date
20260512
Application Date
20250429

Claims (7)

  1. 1. The low-nitrogen burner suitable for the multiple working conditions comprises a fire basin brick (100), an outer layer gas gun (200), a cylinder body (300), a gas-liquid split combined spray gun (400) and a central cyclone sleeve (500), and is characterized in that the cylinder body (300) is fixedly connected to a heating furnace bottom plate, the top of the cylinder body (300) extends into the heating furnace bottom plate, and the fire basin brick (100) is fixedly connected to the top of the cylinder body (300); The bottom end of the cylinder body (300) is fixedly connected with a bottom end plate (301), a plurality of groups of outer layer gas guns (200) are fixedly connected to the bottom end plate (301) in an annular array, the middle area of the plurality of groups of outer layer gas guns (200) on the bottom end plate (301) is fixedly connected with a gas-liquid split combined spray gun (400), the outer layer gas guns (200) and the gas-liquid split combined spray gun (400) are both positioned in the cylinder body (300), and the top ends of the outer layer gas guns (200) penetrate out of the cylinder body (300) and are positioned at the periphery of the outer side of the fire pot brick (100); The gas-liquid split combined spray gun (400) comprises a central liquid guide spray gun (401), an inner layer gas gun (402), a ring plate (403), a gun barrel (404), a jacket pipe (405), a supporting lug (406) and a flange (407), wherein the gun barrel (404) is fixedly connected to the bottom end plate (301), the top end of the gun barrel (404) is fixedly connected with the ring plate (403), the ring plate (403) is fixedly connected with the central liquid guide spray gun (401), a fuel gas channel (408) is arranged between the central liquid guide spray gun (401) and the gun barrel (404), a plurality of groups of inner layer gas guns (402) are fixedly connected to the gun barrel (404) near the top of the gun barrel, the inner layer gas guns (402) are communicated with the fuel gas channel (408), a plurality of groups of joints (409) are fixedly connected to the gun barrel (404) near the bottom of the gun barrel, the joints (409) are communicated with the fuel gas channel (408), the bottom end of the gun barrel (404) is fixedly connected with the flange (407), a groove (407) is arranged in the middle part, a groove (410) is arranged on the inner side, a groove (410) is arranged on the circumference of the gun barrel (410), a plurality of grooves (411) is communicated with the groove (410), the inner-layer gas gun (402) is positioned at the periphery of the inner side of the fire basin brick (100), the central liquid guide spray gun (401) is positioned at the center of the fire basin brick (100), the joint (409) is connected with the outer-layer gas gun (200) through a metal hose (412), and the jacket pipe (405) is fixedly connected in the gun barrel (404) close to the bottom of the gun barrel through the support lugs (406); the fire basin brick is characterized in that the central cyclone sleeve (500) is arranged inside the fire basin brick (100), the central cyclone sleeve (500) is sleeved on the central liquid guide spray gun (401), and a plurality of groups of cyclone sheets (501) are arranged in the central cyclone sleeve (500).
  2. 2. A low-nitrogen burner according to claim 1, wherein said bottom end plate (301) is fixedly connected with a pilot burner part (600), said pilot burner part (600) being located in said barrel (300).
  3. 3. The low-nitrogen burner applicable to multiple working conditions according to claim 1, wherein a square tube (701) is fixedly connected to the cylinder (300), and a damper structure (702) is arranged on the square tube (701).
  4. 4. The low-nitrogen burner applicable to multiple working conditions according to claim 1, wherein the fire basin brick (100) adopts a hollow cylindrical structure, a combustion air channel is arranged in the middle of the fire basin brick (100), the diameters of an upper opening and a lower opening of the fire basin brick (100) are the same, a plurality of groups of U-shaped notches (101) are arranged on the periphery of the outer side of the fire basin brick (100) in an annular array, the number of outer layer gas guns (200) is the same as that of the U-shaped notches (101), and the outer layer gas guns (200) are positioned in the U-shaped notches (101) in a one-to-one correspondence manner; The fire basin brick (100) comprises a round platform part (102) and a conical part (103) positioned on the upper part of the round platform part (102), wherein the round platform part (102) is fixedly connected to the top end face of the cylinder body (300).
  5. 5. The low-nitrogen burner applicable to multiple working conditions according to claim 1, wherein the central swirl sleeve (500) further comprises a central sleeve (502), an air duct (503) and a taper pipe (504) and flat steel (505), the central sleeve (502) is arranged at the top of the air duct (503), the air duct (503) is fixedly connected with the central sleeve (502) through the swirl plate (501), the taper pipe (504) is fixedly connected with the bottom of the air duct (503), the bottom of the taper pipe (504) is fixedly connected with the inner-layer gas gun (402) through the flat steel (505), and the top of the central liquid guide spray gun (401) penetrates into the central sleeve (502).
  6. 6. The low-nitrogen burner applicable to multiple working conditions according to claim 1, wherein an insulation layer (302) is fixedly connected to the inner wall of the cylinder (300), and the outer-layer gas gun (200) penetrates out of the insulation layer (302).
  7. 7. The low-nitrogen burner applicable to multiple working conditions according to claim 1, wherein a mounting ring (303) is fixedly connected to the bottom end of the cylinder (300), and the bottom end plate (301) is fixedly connected with the mounting ring (303) through bolts.

Description

Low-nitrogen combustor suitable for multiple working conditions Technical Field The utility model relates to the technical field of petrochemical heating furnace burners, in particular to a low-nitrogen burner suitable for multiple working conditions. Background In the energy saving and efficiency improvement of heating furnaces in recent years, tail gas, waste gas and the like of a part of devices in a refinery are sent to the petrochemical heating furnaces to be used as fuel gas, and the fuel gas is entrained with a quantity of noncondensable gas, water or oil, and is gathered in a fuel gas pipeline under the condition of low air temperature to be brought into a burner, so that the problem of fuel gas liquid inclusion occurs, the fuel gas liquid inclusion is sprayed into a flame zone in and above a fire pot brick through spray holes to burn, the problems of coking, black smoke emission, combustion efficiency reduction and the like are caused when the fuel gas liquid inclusion is heated under the condition of high-temperature radiation of flame, and along with the severity of coking, coke blocks gradually block the throat of the fire pot brick of the burner, thereby adversely affecting the flame forming, affecting the air supply, the bias flow of combustion-supporting air to cause the flame to fly, and simultaneously, the surface temperature of the coke blocks attached in the fire pot brick is higher, the heat dissipation is bad, the temperature in the fire pot is increased, the flame temperature is affected, and the generation of nitrogen oxides is deviated from the working condition of low-nitrogen design; The fuel gas clamping liquid also causes fluctuation of the heat value of the fuel gas, the same pressure, the spray hole is unchanged, the combustion load is increased, in order to adapt to the load requirement of the heating furnace, the pressure of the fuel gas entering the burner needs to be reduced when the fuel gas is clamped liquid, so that the spraying speed of the fuel gas is reduced, the spraying speed of liquid drops is low, and the liquid drops drop in the burner cylinder under the action of gravity when not reaching a designated position, thereby causing backfire of the burner and burning the burner; The problem of the liquid is pressed from both sides to the fuel gas of mill reply, mainly strengthens the gas-liquid separator and improves the fuel gas pipeline heat tracing at present, but some producer is because geographical position is north, and when ambient temperature is lower, it is troublesome to press from both sides liquid problem to handle, and the effect is not ideal. Disclosure of utility model In view of the above-mentioned shortcomings in the prior art, the present utility model aims to provide a burner for realizing staged combustion to control flame temperature and inhibit the generation of nitrogen oxides in large quantities. The low-nitrogen burner suitable for the multiple working conditions comprises a fire basin brick, an outer-layer gas gun, a cylinder, a gas-liquid split combined spray gun and a central cyclone sleeve, wherein the cylinder is fixedly connected to a heating furnace bottom plate, the top of the cylinder stretches into the heating furnace bottom plate, and the fire basin brick is fixedly connected to the top of the cylinder; The bottom end of the cylinder is fixedly connected with a bottom end plate, a plurality of groups of outer gas guns are fixedly connected to the bottom end plate in an annular array, the middle areas of the outer gas guns are fixedly connected with the gas-liquid diversion combined spray guns, the outer gas guns and the gas-liquid diversion combined spray guns are all positioned in the cylinder, and the top ends of the outer gas guns penetrate out of the cylinder and are positioned at the periphery of the outer side of the fire pot brick; The gas-liquid split combined spray gun comprises a central liquid guide spray gun, an inner-layer gas gun, a ring plate, a gun barrel, a clamping sleeve, a supporting lug and a flange, wherein the gun barrel is fixedly connected to the bottom end plate, the top end of the gun barrel is fixedly connected with the ring plate, the ring plate is fixedly connected with the central liquid guide spray gun, a fuel gas channel is arranged between the central liquid guide spray gun and the gun barrel, a plurality of groups of inner-layer gas guns are fixedly connected to the gun barrel near the top of the gun barrel, the inner-layer gas guns are communicated with the fuel gas channel, a plurality of groups of connectors are fixedly connected to the gun barrel near the bottom of the gun barrel, the connectors are communicated with the fuel gas channel, the bottom end of the gun barrel is fixedly connected with the flange, a groove is formed in the middle of the inner side of the flange, a plurality of groups of small through holes are formed in the periphery of the groove, the bottom end of the central liqu