Kiln gas premixing top-blowing combustion system

Abstract

The utility model relates to the technical field of kiln combustion, in particular to a kiln gas premixing top-blowing combustion system which comprises a combustion nozzle, a gas-air mixer is assembled on the back of the combustion nozzle, a gas inlet bin is integrally arranged on the back of the gas-air mixer, and a gas-air mixed gas pipe is assembled and connected to the side edge of the gas inlet bin. The other end of the gas-air mixed gas pipe is connected with a gas-air proportional valve, the gas inlet end of the gas-air proportional valve is connected with an air inlet pipe and a gas inlet pipe, and a transmission rotating shaft is assembled in the gas inlet bin. According to the utility model, the premixed combustion technology is conveniently adopted in the modified kiln, so that the gas is fully mixed with enough air before combustion. In the combustion process, fuel is fully combusted, the generated flame is short, the temperature of an outlet of the combustor is uniform, and the dimensional accuracy of a fired product is improved. And in the aspect of environmental protection, fuel is completely combusted, generation of harmful gas is reduced, the combustion heat efficiency is improved, energy consumption is reduced, and emission of pollutants is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of kiln combustion, in particular to a kiln gas premixed top-blowing combustion system. Background Art

[0002] Industrial furnaces are devices that use combustion reactions to heat materials. Furnaces are mostly used in smelting and mechanical industrial systems, mainly for smelting and preparing steel, various non-ferrous metal materials, etc. Kilns are mostly used in silicate industrial systems, such as the production of ceramics, bricks and tiles, cement, glass, etc. Industrial furnaces refer to thermal equipment that uses energy converted from fuel or electrical energy in industrial production to smelt, roast, sinter, melt, heat, and other processes on materials or workpieces. The combustion nozzles of existing industrial kilns use diffusion combustion;

[0003] However, the existing industrial kilns are mixing and burning at the same time, so the length of the burning flame is long, which makes the temperature distribution around the nozzle uneven, and the shrinkage of the fired products is inconsistent, which affects the product precision. On the other hand, when the air supply is insufficient and the combustion mixing is poor, incomplete combustion will occur. The thermal efficiency of the fuel is reduced, and energy consumption is increased. Harmful gases are generated, which affects the emission of pollutants;

[0004] Therefore, in order to solve the above problems, a kiln gas premixed top-blowing combustion system is proposed. Utility Model Content

[0005] The purpose of the utility model is to provide a kiln gas premixed top-blown combustion system to solve the problems of the existing industrial kilns mentioned in the above background technology: 1. The temperature distribution around the nozzle is uneven, and the shrinkage of the fired products on different surfaces is inconsistent, which affects the product precision; 2. Insufficient air supply and poor combustion mixing will cause incomplete combustion, affecting efficiency and emission problems.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a kiln gas premixed top-blowing combustion system, comprising a combustion nozzle, a fuel-air mixer is installed on the back of the combustion nozzle, an air intake bin is integrally arranged on the back of the fuel-air mixer, a fuel-air mixed gas pipe is installed and connected to the side of the air intake bin, a fuel-air mixed gas pipe is connected to the other end of the fuel-air mixed gas pipe with a fuel-air ratio valve, the air intake end of the fuel-air ratio valve is respectively connected to an air intake pipe and a gas intake pipe, a transmission shaft is installed inside the air intake bin, a blowing piece is installed on the outer wall of the transmission shaft, the blowing piece is aligned with the air outlet of the fuel-air mixed gas pipe, a transmission bevel gear is installed at the lower part of the transmission shaft, a driven bevel gear is meshed on the lower side of the transmission bevel gear, a driven rotating rod is fixed inside the driven bevel gear, and a stirring rod is installed on the outer wall of the driven rotating rod.

[0007] Preferably, a docking nut is integrally provided at the side end of the fuel-air mixture pipe, and the side wall of the air intake chamber is equipped with an air intake docking seat corresponding to the docking nut, and the air outlet end of the air intake docking seat is aligned with the blow plate, and the inner end of the blow plate is supported and assembled on the outer wall of the transmission shaft through a blow rod.

[0008] Preferably, the driven rotating rod is laterally assembled inside the fuel-air mixer, and the two ends and the middle part of the driven rotating rod are supported and assembled by supporting bearing sleeves, the outer end of the stirring rod is equipped with a stirring paddle, and the outer cover of the transmission bevel gear and the driven bevel gear is equipped with a maintenance inner bin, and the side wall of the maintenance inner bin is provided with an assembly through hole corresponding to the transmission shaft and the driven rotating rod, and the assembly through hole is filled with a sealing ring.

[0009] Preferably, the upper and lower ends of the transmission shaft are supported and assembled by assembled bearings, and the outer cover of the assembled bearing is provided with a maintenance cover, the top outer wall cover of the air intake bin is provided with a flange, and the driven rotating rod is sleeved on the outside of the upper end of the transmission shaft, and a sealing sleeve is filled between the upper end of the transmission shaft and the inner wall of the air intake bin.

[0010] Preferably, an air pressure gauge is installed in the middle of the side of the air intake pipe away from the fuel-air ratio valve, and two groups of blowers are installed and connected to the outer end of the air intake pipe, a one-way valve is installed between the blower and the air pressure gauge, and an electric-controlled actuator valve is installed between the two groups of fuel-air ratio valves and the air pressure gauge.

[0011] Preferably, a gas pressure gauge is installed on the side of the gas inlet pipe close to the fuel-air ratio valve, a stop valve is installed on the outer end of the gas inlet pipe, and a pressure reducing valve and a solenoid valve are installed in sequence between the stop valve and the gas pressure gauge.

[0012] Preferably, a thermocouple probe is provided between the two groups of combustion nozzles, the thermocouple probe is mounted on the inner wall of the kiln, and the outer side of the thermocouple probe is connected to an electrical control cabinet via a data line, and the electrical control cabinet is mounted on the outer side of the kiln.

[0013] Compared with the prior art, the utility model has the following beneficial effects: the utility model facilitates the use of premixed combustion technology in the modified kiln, so that the gas is fully mixed with sufficient air before combustion. During the combustion process, the fuel burns fully, the flame produced is short, the burner outlet temperature is uniform, and the dimensional accuracy of the fired product is improved. From the environmental protection aspect, the fuel burns completely, reducing the generation of harmful gases, improving the combustion thermal efficiency, reducing energy consumption, and reducing the emission of pollutants;

[0014] The utility model is provided with a configuration in which, under the assembly of the fuel-air mixer and the transmission shaft, the transmission bevel gear drives the driven bevel gear to rotate, so that the driven rotating rod drives the stirring rod to rotate, stir and blow air, thereby facilitating the maintenance of uniform air intake after the fuel-air mixture, making the combustion more uniform and sufficient. Through this design, the convenience and practicality of the kiln gas premixed top blowing combustion system are improved.

[0015] The utility model is provided with a fuel-air proportion valve, and under the connection of the air intake pipe and the gas intake pipe, premixing is performed before entering the combustion nozzle, making the operation more convenient and facilitating the control and subsequent combustion more complete and convenient. Through this design, the convenience and practicality of the kiln gas premixed top-blown combustion system are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the assembly and connection of the combustion system of the utility model;

[0017] Figure 2 This is a front view cross-sectional schematic diagram of the local structure of the fuel-air mixer of the utility model;

[0018] Figure 3 For this utility model Figure 2 A schematic diagram of the structure enlargement in the middle;

[0019] Figure 4 For this utility model Figure 2 A magnified schematic diagram of the structure at B in the middle;

[0020] In the figure: 100, fuel-air mixer; 101, air intake chamber; 110, combustion nozzle; 120, fuel-air mixture pipe; 121, docking nut; 122, air intake docking seat; 200, transmission shaft; 201, assembly bearing; 202, maintenance cover; 203, flange; 204, sealing sleeve; 210, transmission bevel gear; 220, driven bevel gear; 230, driven rotating rod; 231, support bearing; 240, stirring rod; 241, stirring paddle; 250 , blowing piece; 251, blowing rod; 260, maintenance inner compartment; 261, assembly through hole; 262, sealing ring; 300, fuel-air ratio valve; 310, air intake pipe; 311, electric control actuator valve; 312, air pressure gauge; 313, one-way valve; 314, blower; 320, gas intake pipe; 321, gas pressure gauge; 322, solenoid valve; 323, pressure reducing valve; 324, stop valve; 400, thermocouple probe; 410, electrical control cabinet. DETAILED DESCRIPTION

[0021] 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 creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-4 , an embodiment provided by the utility model:

[0023] The kiln gas premixed top-blowing combustion system comprises a combustion nozzle 110, a fuel-air mixer 100 is mounted on the back of the combustion nozzle 110, an air inlet bin 101 is integrally arranged on the back of the fuel-air mixer 100, a fuel-air mixed gas pipe 120 is mounted and connected to the side of the air inlet bin 101, a fuel-air mixed gas pipe 120 is connected to the other end of the fuel-air mixed gas pipe 120, an air inlet pipe 310 and a gas inlet pipe 320 are respectively connected to the air inlet end of the fuel-air mixed gas pipe 320, a transmission shaft 200 is mounted inside the air inlet bin 101, a blowing piece 250 is mounted on the outer wall of the transmission shaft 200, the blowing piece 250 is aligned with the gas outlet of the fuel-air mixed gas pipe 120, a transmission bevel gear 210 is mounted on the lower part of the transmission shaft 200, a driven bevel gear 220 is meshed on the lower side of the transmission bevel gear 210, a driven rotating rod 230 is fixed inside the driven bevel gear 220, and a stirring rod 240 is mounted on the outer wall of the driven rotating rod 230;

[0024] Furthermore, a docking nut 121 is integrally provided at the side end of the fuel-air mixture pipe 120, and an air intake docking seat 122 corresponding to the docking nut 121 is installed on the side wall of the air intake chamber 101, and the air outlet end of the air intake docking seat 122 is aligned with the blowing piece 250, and the inner end of the blowing piece 250 is supported and assembled on the outer wall of the transmission shaft 200 by the blowing rod 251. Through this design, it is convenient to intake air inside the fuel-air mixer 100 and blow the blowing piece 250, making subsequent operations more convenient;

[0025] Furthermore, the driven rotating rod 230 is laterally assembled inside the fuel-air mixer 100, and the two ends and the middle of the driven rotating rod 230 are supported and assembled by sleeves of support bearings 231, the outer end of the stirring rod 240 is equipped with a stirring paddle 241, and the outer cover of the transmission bevel gear 210 and the driven bevel gear 220 is equipped with a maintenance inner bin 260, and the side wall of the maintenance inner bin 260 is provided with an assembly through hole 261 corresponding to the transmission shaft 200 and the driven rotating rod 230, and the assembly through hole 261 is filled with a sealing ring 262. Through this design, it is convenient to stably support and assemble the driven rotating rod 230 and drive the rotation to drive the stirring;

[0026] Furthermore, the upper and lower ends of the transmission shaft 200 are supported and assembled by the assembly bearings 201, and the outer cover of the assembly bearing 201 is provided with a maintenance cover 202, the outer wall cover of the top of the air inlet bin 101 is provided with a flange 203, and the driven rotating rod 230 is sleeved on the outer side of the upper end of the transmission shaft 200, and a sealing sleeve 204 is filled between the upper end of the transmission shaft 200 and the inner wall of the air inlet bin 101. Through this design, it is convenient to assemble and seal the transmission shaft 200, and it is also convenient to carry out auxiliary drive docking at the rear end. According to needs, the top end of the transmission shaft 200 can be assembled with a docking drive motor to carry out auxiliary drive rotation, making subsequent operations more convenient;

[0027] Furthermore, an air pressure gauge 312 is installed in the middle of one side of the air inlet pipe 310 away from the fuel-air ratio valve 300, and two sets of blowers 314 are installed and connected to the outer end of the air inlet pipe 310, a one-way valve 313 is installed between the blower 314 and the air pressure gauge 312, and an electric control actuator valve 311 is installed between the two sets of fuel-air ratio valves 300 and the air pressure gauge 312. Through this design, it is easy to ensure the continuity of the kiln operation, and the air for combustion is not easily interrupted;

[0028] Furthermore, a gas pressure gauge 321 is installed on one side of the gas inlet pipe 320 close to the fuel-air ratio valve 300, a stop valve 324 is installed on the outer end of the gas inlet pipe 320, and a pressure reducing valve 323 and a solenoid valve 322 are installed between the stop valve 324 and the gas pressure gauge 321 in sequence. This design facilitates the control of the gas supply;

[0029] Furthermore, a thermocouple probe 400 is provided between the two groups of combustion nozzles 110. The thermocouple probe 400 is mounted on the inner wall of the kiln, and the outer side of the thermocouple probe 400 is connected to an electrical control cabinet 410 via a data cable. The electrical control cabinet 410 is mounted on the outer side of the kiln. This design facilitates the detection of the actual combustion temperature.

[0030] Working principle: When assembling and using, the gas premix top blowing scheme is adopted, and the flame is allowed to enter the kiln from the combustion nozzle 110 above the kiln top. Since the flame is short and the combustion temperature is high after the gas and air are fully mixed, the temperature field in the kiln is uniform, which improves the product quality and saves gas. Moreover, the flame is sprayed from the kiln top into the side gap of the product stack to avoid the combustion flame spraying onto the surface of the product, so that the size of the fired product is more accurate. At the same time, it is necessary to prevent the burner from backfire. When turning off the gas and extinguishing the flame, it is necessary to pay attention to the air supply blower 314. At the same time, according to the needs of use, the relevant control module can be installed inside the electrical control cabinet 410 for microcomputer control, and it can be monitored and controlled by the thermocouple probe 400. The size of the combustion-supporting air is adjusted to control the size of the gas to achieve the technology of adjusting the kiln temperature, that is, it is controlled by controlling the amount of air entering the gas inlet pipe 320;

[0031] During operation, air and gas are supplied through the air intake pipe 310 and the gas intake pipe 320, and the relevant gas and air are introduced in proportion with the cooperation of the fuel-air ratio valve 300 for pre-mixing, and then introduced into the fuel-air mixer 100 with the cooperation of the fuel-air mixture pipe 120, and then burned through the combustion nozzle 110. When the fuel-air mixture enters the fuel-air mixer 100 through the fuel-air mixture pipe 120, the blowing piece 250 is facilitated to be purged with the cooperation of the air intake docking seat 122, so that the blowing piece 250 drives the transmission shaft 200 to rotate, and the transmission shaft 200 drives the driven rotating rod 230 to rotate with the cooperation of the transmission bevel gear 210 and the driven bevel gear 220, so that the driven rotating rod 230 drives the stirring rod 240 to stir, mix and blow the gas after entering the fuel-air mixer 100 again, so that the subsequent combustion operation is more convenient and efficient, and the operation ends here.

[0032] The above description is only a preferred embodiment of the utility model and does not limit the utility model in any form. Any ordinary technician in the industry can smoothly implement the utility model as shown in the drawings of the specification and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the utility model using the technical content disclosed above are all equivalent embodiments of the utility model. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the utility model are still within the protection scope of the technical solution of the utility model.

Claims

1. A kiln gas premixed top-blowing combustion system, comprising a combustion nozzle (110), characterized in that: The combustion nozzle (110) is provided with a fuel-air mixer (100) on the back, and an air intake chamber (101) is integrally provided on the back of the fuel-air mixer (100). A fuel-air mixture pipe (120) is provided on the side of the air intake chamber (101), and the other end of the fuel-air mixture pipe (120) is connected to a fuel-air ratio valve (300). The air intake end of the fuel-air ratio valve (300) is respectively connected to an air intake pipe (310) and a gas intake pipe (320). The air intake chamber (101) is provided with a A transmission shaft (200), the outer wall of the transmission shaft (200) being equipped with a blowing plate (250), the blowing plate (250) being aligned with the gas outlet of the fuel-air mixture pipe (120), the lower part of the transmission shaft (200) being equipped with a transmission bevel gear (210), the lower side of the transmission bevel gear (210) being meshed with a driven bevel gear (220), a driven rotating rod (230) being fixed inside the driven bevel gear (220), and a stirring rod (240) being equipped on the outer wall of the driven rotating rod (230).

2. The kiln gas premixed top-blown combustion system according to claim 1 is characterized in that: The side end of the fuel-air mixture pipe (120) is integrally provided with a docking nut (121); the side wall of the air intake chamber (101) is equipped with an air intake docking seat (122) corresponding to the docking nut (121); the air outlet end of the air intake docking seat (122) is aligned with the blow plate (250); the inner end of the blow plate (250) is supported and assembled on the outer wall of the transmission shaft (200) through a blow rod (251).

3. The kiln gas premixed top-blown combustion system according to claim 1 is characterized in that: The driven rotating rod (230) is laterally mounted inside the fuel-air mixer (100), and the two ends and the middle of the driven rotating rod (230) are sleeved and supported by support bearings (231). The outer end of the stirring rod (240) is equipped with a stirring paddle (241). The outer cover of the driving bevel gear (210) and the driven bevel gear (220) is equipped with a maintenance inner bin (260). The side wall of the maintenance inner bin (260) is provided with an assembly through hole (261) corresponding to the driving shaft (200) and the driven rotating rod (230), and the assembly through hole (261) is filled with a sealing ring (262).

4. The kiln gas premixed top-blowing combustion system according to claim 1 is characterized in that: The upper and lower ends of the transmission shaft (200) are supported and assembled by means of assembly bearings (201), and the outer cover of the assembly bearing (201) is provided with a maintenance cover (202), the top outer wall cover of the air inlet bin (101) is provided with a flange (203), and the driven rotating rod (230) is sleeved on the outside of the upper end of the transmission shaft (200), and a sealing sleeve (204) is filled between the upper end of the transmission shaft (200) and the inner wall of the air inlet bin (101).

5. The kiln gas premixed top-blowing combustion system according to claim 1 is characterized in that: An air pressure gauge (312) is installed in the middle of a side of the air intake pipe (310) away from the fuel-air ratio valve (300), and two sets of blowers (314) are installed and connected to the outer end of the air intake pipe (310), a one-way valve (313) is installed between the blower (314) and the air pressure gauge (312), and an electric control actuator valve (311) is installed between the two sets of the fuel-air ratio valve (300) and the air pressure gauge (312).

6. The kiln gas premixed top-blowing combustion system according to claim 1 is characterized in that: A gas pressure gauge (321) is installed on the side of the gas inlet pipe (320) close to the fuel-air ratio valve (300), a stop valve (324) is installed on the outer end of the gas inlet pipe (320), and a pressure reducing valve (323) and a solenoid valve (322) are installed in sequence between the stop valve (324) and the gas pressure gauge (321).

7. The kiln gas premixed top-blowing combustion system according to claim 1 is characterized in that: A thermocouple probe (400) is arranged between the two groups of combustion nozzles (110), the thermocouple probe (400) is mounted on the inner wall of the kiln, and the outer side of the thermocouple probe (400) is connected to an electrical control cabinet (410) via a data cable, and the electrical control cabinet (410) is mounted on the outer side of the kiln.

Images