FGR low-nitrogen emission combustor
By introducing expansion joints and movable support structures into the burner, the problems of component deformation and nitrogen oxide emissions caused by thermal expansion at high temperatures have been solved, thus achieving both stability and environmental friendliness of the burner.
Patent Information
- Application Number
- CN202420821793.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-19
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-04-19
AI Technical Summary
When existing burners operate at high temperatures, the metal parts are prone to increased stress due to thermal expansion, which may cause machine leakage problems, and the emission of nitrogen oxides does not meet environmental protection standards.
Design an FGR low-NOx emission burner, which adopts a telescopic joint and movable support structure, including a fixed support and a movable support, a support rod, a support seat and a rolling element, to prevent the heating cylinder from deforming due to thermal expansion, and to reduce NOx emissions by achieving secondary combustion through a flue gas recycling pipe.
It improves the stability of the burner at high temperatures, prevents component deformation, reduces nitrogen oxide emissions, and meets environmental protection standards.
Smart Images
Figure CN222316997U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of burners, in particular to an FGR low-nitrogen emission burner. Background Art
[0002] In recent years, coating has become an important part of modern product manufacturing process. The quality of anti-rust and anti-corrosion coating is one of the important aspects of the overall quality of the product. The appearance quality of the product not only reflects the protection and decorative performance of the product, but is also an important factor in the value of the product. Coating is a systematic project, which includes three basic processes: surface treatment of the coated object before coating, coating process and drying, as well as a reasonably designed coating system. The drying process generally uses a burner to burn natural gas to provide a heat source, but the high-temperature flue gas generated after combustion contains a large amount of nitrogen oxides, which does not meet the "Comprehensive Emission Standards for Air Pollutants" when discharged. Therefore, the FGR flue gas recirculation method is generally used for secondary combustion. However, during use, due to the high combustion temperature, metal parts will undergo thermal expansion. If no suppression measures are taken, the internal parts of the machine will expand, causing increased stress, which may cause serious leakage problems. Utility Model Content
[0003] In view of this, the purpose of the utility model is to provide a FGR low nitrogen emission burner to address the deficiencies of the prior art and improve the stability of the burner when running at high temperatures.
[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0005] An FGR low-nitrogen emission burner comprises a burner, a fire protection tube, a heating tube, a ventilation box, a heat exchange pipe and a flue gas recycling pipe. The burner is arranged at the inlet of the heating tube, the fire protection tube is arranged at the front end of the burner, the outlet of the heating tube is connected to the air inlet of the ventilation box, the heat exchange pipe is arranged on the ventilation box, the air outlet of the ventilation box is connected to the inlet of the flue gas recycling pipe, the outlet of the flue gas recycling pipe extends into the fire protection tube, an expansion joint 1 is arranged between the outlet of the heating tube and the air inlet of the ventilation box, an expansion joint 2 is arranged between the air outlet of the ventilation box and the inlet of the flue gas recycling pipe, and a fixed support and a movable support are arranged at the bottom of the heating tube.
[0006] Furthermore, the movable support includes a support rod, a support seat and a rolling body. The top of the support rod is connected to the bottom of the heating tube, the bottom of the support rod is connected to the support seat, a groove is provided at the bottom of the support seat, and the rolling body is arranged in the groove.
[0007] Furthermore, a bottom plate is arranged below the rolling body.
[0008] Furthermore, an inspection port is also provided on the ventilation box.
[0009] The beneficial effects of the utility model are:
[0010] The utility model installs expansion joints at both ends of the ventilation box to prevent the box body from damaging the ventilation box when thermal expansion occurs, and provides a fixed support and a movable support at the bottom of the heating cylinder. The fixed support plays a role of main support to prevent the heating cylinder from moving as a whole, and the movable support plays a role of auxiliary support and moves with the heating cylinder when thermal expansion occurs, thereby avoiding the hidden danger of deformation of the heating cylinder due to increased cylinder stress caused by thermal expansion. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a schematic diagram of the structure of the utility model;
[0012] Figure 2 It is an enlarged structural schematic diagram of the heating cylinder in the utility model;
[0013] Figure 3 It is an enlarged structural schematic diagram of the movable support in the utility model.
[0014] In the figure: 1-burner, 2-fire protection tube, 3-heating tube, 4-ventilation box, 5-heat exchange tube, 6-smoke recycling tube, 7-expansion joint 1, 8-expansion joint 2, 9-fixed support, 10-movable support, 1001-support rod, 1002-support seat, 10021-groove, 1003-rolling body, 1004-bottom plate, 11-inspection port. DETAILED DESCRIPTION
[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.
[0016] Reference Figure 1-Figure 3The utility model provides a FGR low nitrogen emission burner, including a burner 1, a fire protection tube 2, a heating tube 3, a ventilation box 4, a heat exchange tube 5 and a flue gas recycling tube 6. The burner 1 is arranged at the inlet of the heating tube 3, and the fire protection tube 2 is arranged at the front end of the burner 1. The outlet of the heating tube 3 is connected to the air inlet of the ventilation box 4. The ventilation box 4 is also provided with an inspection port 11, which can be entered for maintenance work. The heat exchange tube 5 is arranged on the ventilation box 4, and the air outlet of the ventilation box 4 is connected to the inlet of the flue gas recycling tube 6. The outlet of the flue gas recycling tube 6 extends into the fire protection tube 2, so that the gas with a large amount of nitrogen oxides re-enters the fire protection tube 2 for secondary combustion, thereby improving the combustion efficiency. A telescopic joint 7 is arranged between the outlet of the heating tube 3 and the air inlet of the ventilation box 4 to increase the deformation margin of the heating tube 3 and the ventilation box 4. A telescopic joint 8 is arranged between the air outlet of the ventilation box 4 and the inlet of the flue gas recycling tube 6, so that the tail of the ventilation box 4 has a certain deformation margin when it expands in a high temperature environment.
[0017] A fixed support 9 and a movable support 10 are provided at the bottom of the heating tube 3. The fixed support 9 plays the role of the main support to prevent the heating tube 3 from moving as a whole. The movable support 10 plays the role of an auxiliary support and moves with the heating tube 3 when the heating tube 3 undergoes thermal expansion, so as to avoid the hidden danger of deformation of the heating tube 3 due to increased stress in the cylinder body caused by thermal expansion. Among them, the movable support 10 includes a support rod 1001, a support seat 1002 and a rolling body 1003. The top of the support rod 1001 is connected to the bottom of the heating tube 3, and the bottom of the support rod 1001 is connected to the support seat 1002. A groove 10021 is provided at the bottom of the support seat 1002. The rolling body 1003 is provided in the groove 10021. The rolling body 1003 can move in the groove 10021 along with the deformation of the heating tube 3. A bottom plate 1004 is provided below the rolling body 1003 to prevent the rolling body 1003 from directly contacting the ground for a long time to form a pit.
[0018] During operation, the burner 1 is ignited, and the high-temperature gas generated enters the ventilation box 4 through the outlet of the heating tube 3. After heat exchange through the heat exchange tube 5 on the ventilation box 4, the gas containing a large amount of nitrogen oxides re-enters the fire protection tube 2 for secondary combustion, and a small part of the high-temperature smoke is discharged into the atmosphere. During the combustion process, the heating tube 3 expands at high temperature, and the movable support 10 at the bottom moves together with the expansion and deformation of the heating tube 3. At the same time, since an expansion joint 7 is provided between the outlet of the heating tube 3 and the air inlet of the ventilation box 4, the ventilation box 4 and the heating tube 3 are softly connected, which can withstand the excess deformation of the ventilation box 4.
[0019] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the utility model by ordinary technicians in this field should be included in the scope of the claims of the utility model as long as they do not depart from the spirit and scope of the technical solution of the utility model.
Claims
1. An FGR low nitrogen emission burner, comprising a burner (1), a fire protection tube (2), a heating tube (3), a ventilation box (4), a heat exchange pipe (5) and a flue gas recycling pipe (6), wherein the burner (1) is arranged at the inlet of the heating tube (3), the fire protection tube (2) is arranged at the front end of the burner (1), the outlet of the heating tube (3) is connected to the air inlet of the ventilation box (4), the heat exchange pipe (5) is arranged on the ventilation box (4), the air outlet of the ventilation box (4) is connected to the inlet of the flue gas recycling pipe (6), and the outlet of the flue gas recycling pipe (6) extends into the fire protection tube (2), characterized in that: A first expansion joint (7) is provided between the outlet of the heating cylinder (3) and the air inlet of the ventilation box (4), a second expansion joint (8) is provided between the air outlet of the ventilation box (4) and the inlet of the smoke recycling pipe (6), and a fixed support (9) and a movable support (10) are provided at the bottom of the heating cylinder (3).
2. The FGR low nitrogen emission burner according to claim 1, characterized in that: The movable support (10) comprises a support rod (1001), a support seat (1002) and a rolling body (1003); the top of the support rod (1001) is connected to the bottom of the heating tube (3); the bottom of the support rod (1001) is connected to the support seat (1002); a groove (10021) is provided at the bottom of the support seat (1002), and the rolling body (1003) is arranged in the groove (10021).
3. The FGR low nitrogen emission burner according to claim 2, characterized in that: A bottom plate (1004) is arranged below the rolling body (1003).
4. The FGR low nitrogen emission burner according to claim 1, characterized in that: The ventilation box (4) is also provided with an inspection port (11).