Heat accumulating type combustion device

Abstract

The utility model relates to a heat accumulating type combustion device, and belongs to the technical field of gas combustion devices. Comprising a hearth, a first heat accumulator and a second heat accumulator, a first air opening and a second air opening are formed in the hearth, the first heat accumulator is communicated with the first air opening through a first ventilation channel, and the second heat accumulator is communicated with the second air opening through a second ventilation channel; the included angle between the first ventilation channel and the first air opening and the included angle between the second ventilation channel and the second air opening are both smaller than 90 degrees, a first burner and a second burner are installed on the first ventilation channel and the second ventilation channel respectively, an outlet of the first burner faces the first air opening, an outlet of the second burner faces the second air opening, and a third burner is further installed on the hearth. According to the utility model, the problem of poor co-combustion caused by blockage of the air duct and the fuel port due to feeding at present is effectively solved, the production efficiency and the fuel combustion efficiency are high, the failure rate is low, and the emission of waste flue gas generated in production can reach the low-nitrogen and low-oxygen flue gas emission standard.

Description

Technical Field

[0001] The utility model relates to a heat storage combustion device which is suitable for nonferrous metal smelting and belongs to the technical field of gas combustion devices. Background Art

[0002] At present, in the field of non-ferrous metal smelting, most of them use natural gas as clean energy for smelting non-ferrous metals, and some of them use gas regenerative combustion devices for smelting. The existing gas regenerative combustion devices mainly have the following shortcomings:

[0003] 1. The use of a single burner will, on the one hand, cause high-temperature spots in the flame, leading to the massive generation of reactive nitrogen oxide pollutants; on the other hand, the fuel will be unevenly mixed, the furnace tuyere will be easily blocked, and deflagration will occur; on the third hand, it will lead to slow heating in the early stage of the regenerative combustion system, low metal melting rate, and large metal burning loss.

[0004] 2. The heat storage body, exhaust fan pipeline and combustion-supporting fan pipeline are controlled separately through multiple one-way valves. The control process is cumbersome, the failure rate is high, the structure is complex, and the later maintenance is inconvenient.

[0005] Therefore, it is urgent to design a heat storage combustion device that can solve the above-mentioned technical problems. Summary of the invention

[0006] The purpose of the utility model is to solve the deficiencies of the above-mentioned prior art and to provide a heat storage combustion device which can meet the low-nitrogen and low-oxygen flue gas emission standards in the field of non-ferrous metal smelting, is easy to maintain, has sufficient premixing of fuel and air, and solves a series of problems such as slow initial heating, low metal melting rate, and large metal burning loss.

[0007] The utility model discloses a heat storage combustion device, comprising a furnace, a first heat storage body, and a second heat storage body. A first air port and a second air port are provided on the furnace. The first heat storage body is connected to the first air port through a first ventilation channel, and the second heat storage body is connected to the second air port through a second ventilation channel. The utility model is special in that an angle between the first ventilation channel and the first air port and an angle between the second ventilation channel and the second air port are both less than 90°. A first burner and a second burner are respectively installed on the first ventilation channel and the second ventilation channel. The outlet of the first burner faces the first air port, and the outlet of the second burner faces the second air port. A third burner is also installed on the furnace.

[0008] Preferably, the outlet direction of the first burner intersects with the ventilation direction of the first ventilation channel at the first air outlet, and the outlet direction of the second burner intersects with the ventilation direction of the second ventilation channel at the second air outlet;

[0009] Preferably, the first heat storage body and the second heat storage body are respectively connected to one end of the first air inlet and outlet pipeline and the second air inlet and outlet pipeline, and the other ends of the first air inlet and outlet pipeline and the second air inlet and outlet pipeline are installed on two gas inlets and outlets of the four-way reversing valve, and the remaining two ports of the four-way reversing valve are respectively connected to the combustion-supporting fan and the exhaust fan;

[0010] Preferably, the first heat storage body and the second heat storage body have the same structure and are both cylindrical, and a first dust cleaning inspection hole and a second dust cleaning inspection hole are respectively provided under the first heat storage body and the second heat storage body;

[0011] Preferably, the four-way reversing valve comprises a valve body provided with four gas inlets and outlets, a bearing rod penetrating the entire height direction of the valve body is provided in the valve body, two ends of the bearing rod are mounted on the valve body through bearing seats, the bearing rod is driven to rotate by a power mechanism, a bearing baffle is mounted on the bearing rod, the bearing baffle is symmetrically arranged with the bearing rod as the center, four valve cavity baffles for blocking the edges of the bearing baffles are provided on the inner wall of the valve body, the valve cavity baffle comprises a vertical baffle and an upper horizontal baffle and a lower horizontal baffle arranged at the upper and lower ends of the vertical baffle, wherein the vertical baffle is welded to the side wall of the valve body, one end of the upper horizontal baffle is welded to the vertical baffle, and the lower horizontal baffle is welded to the bottom of the valve body;

[0012] Preferably, the power mechanism is driven by a cylinder;

[0013] Preferably, the operation of the four-way reversing valve, the combustion-supporting fan, the exhaust fan, and the power mechanism is controlled by an automatic controller;

[0014] Preferably, the automatic controller adopts a PLC or a single chip microcomputer.

[0015] The utility model is a heat storage combustion device, which is cleverly designed and has the following beneficial effects:

[0016] 1. The three-burner structure is adopted to effectively solve the existing uneven fuel mixing and deflagration phenomenon in the cold material state. The outlets of the first burner and the second burner are facing the air inlet, which solves the congestion of the air inlet and fuel inlet caused by the current feeding problem.

[0017] 2. The outlet direction of the first burner intersects with the ventilation direction of the first ventilation channel at the first air outlet, and the outlet direction of the second burner intersects with the ventilation direction of the second ventilation channel at the second air outlet. This structural design enables the air and fuel to converge at the first air outlet or the second air outlet and then be sprayed into the furnace in a divergent manner, thereby expanding its combustion area, avoiding high-temperature points in the flame, reducing the flame temperature, and inhibiting the generation of reactive nitrogen oxide pollutants. The nitrogen oxides in the exhaust gas emitted after combustion are less than 50mg / m³, and the oxygen content is less than 18%, so that the enterprise does not need to add additional subsequent desulfurization and denitrification treatment equipment, reducing the enterprise's operation and maintenance costs.

[0018] 3. The four-way reversing valve replaces the previous system that required four one-way valves to complete the reversal of combustion air and flue gas, so that one on-site maintenance personnel can complete this work independently, while also reducing the labor intensity of maintenance personnel.

[0019] 4. The heat storage body is designed as a cylindrical structure, which is conducive to better heat exchange between the flue gas in the box and the heat storage structure installed in the box, thereby increasing the temperature of the heat storage bed and improving thermal efficiency.

[0020] In summary, the utility model has an ingenious structural design and has a good application prospect in the field of non-ferrous metal smelting. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 : A schematic structural diagram of a heat storage combustion device of the utility model;

[0022] Figure 2 : Structural diagram of a four-way reversing valve;

[0023] Figure 3 : Schematic diagram of the structure of the valve chamber baffle. DETAILED DESCRIPTION

[0024] 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. Example 1

[0025] A regenerative combustion device of this embodiment is shown in FIG. Figure 1-3 . It includes a furnace 1, a first heat storage body 2, and a second heat storage body 3. The furnace 1 is provided with a first air port 16 and a second air port 17. The first heat storage body 2 is connected with the first air port 16 through a first ventilation channel 12, and the second heat storage body 3 is connected with the second air port 17 through a second ventilation channel 13. The special feature is that the angle between the first ventilation channel 12 and the first air port 16, and the angle between the second ventilation channel 13 and the second air port 17 are both less than 90°. The first ventilation channel 12 and the second ventilation channel 13 are respectively provided with a first burner 10 and a second burner 9. The outlet of the first burner 10 faces the first air port 16, and the outlet of the second burner 9 faces the second air port 17. A third burner 11 is also provided on the furnace 1.

[0026] The outlet direction of the first burner 10 of this embodiment intersects with the ventilation direction of the first ventilation channel 12 at the first air port 16, and the outlet direction of the second burner 9 intersects with the ventilation direction of the second ventilation channel 13 at the second air port 17. This structural design enables the air and fuel to converge at the first air port 16 or the second air port 17 and then be sprayed into the furnace 1 in a divergent shape, thereby expanding its combustion area, avoiding the occurrence of high-temperature points in the flame, and producing the effect of expanding its combustion, reducing the flame temperature, and inhibiting the generation of reactive nitrogen oxide (NOx) pollutants. This special combustion method uses the furnace 1 as a reactor as a whole, and the three burners are arranged to enable the oxidation reaction of the fuel and air to spread throughout the furnace. There is no visible flame and its unique flame high-temperature zone in the traditional combustion method, and the temperature in the entire furnace is very uniform. This combustion method better solves the problem of high pollutants caused by combustion at high preheating temperature. At the same time, the uniform furnace temperature and the elimination of local high temperature improve the heating process, improve the quality of the product, and extend the life of the furnace.

[0027] The first heat storage body 2 and the second heat storage body 3 of this embodiment are respectively connected to one end of the first air inlet and outlet pipeline 6 and the second air inlet and outlet pipeline 7, and the other ends of the first air inlet and outlet pipeline 6 and the second air inlet and outlet pipeline 7 are installed on the two gas inlets and outlets of the four-way reversing valve 8, and the remaining two ports of the four-way reversing valve 8 are respectively connected to the combustion-supporting fan 4 and the exhaust fan 5. The four-way reversing valve 8 of this embodiment replaces the previous system that requires four one-way valves to complete the reversal of combustion-supporting air and flue gas. Through the improvement of the four-way valve body structure, the on-site maintenance personnel can complete this work independently, and the labor intensity of the maintenance personnel is also reduced.

[0028] In this embodiment, the first heat storage body 2 and the second heat storage body 3 have the same structure and are both cylindrical, and a first ash cleaning inspection hole 14 and a second ash cleaning inspection hole 15 are respectively provided below the first heat storage body 2 and the second heat storage body 3. The first heat storage body 2 and the second heat storage body 3 are designed as cylindrical structures, which is conducive to better heat exchange between the flue gas in the box and the heat storage structure installed in the box, thereby increasing the temperature of the heat storage bed and improving the thermal efficiency.

[0029] The four-way reversing valve 8 of the present embodiment includes a valve body with four gas inlets and outlets, a bearing rod 8-1 is provided in the valve body which runs through the entire height direction of the valve body, both ends of the bearing rod 8-1 are installed on the valve body through bearing seats, the bearing rod 8-1 is driven to rotate by a power mechanism, a bearing baffle 8-2 is installed on the bearing rod 8-1, and the bearing baffle 8-2 is symmetrically arranged with the bearing rod 8-1 as the center, and four valve cavity baffles 8-3 for blocking the edges of the bearing baffles 8-2 are provided on the wall of the valve body, the valve cavity baffle 8-3 includes a vertical baffle 8-4 and an upper horizontal baffle 8-5 and a lower horizontal baffle 8-6 arranged at the upper and lower ends of the vertical baffle 8-4, wherein the vertical baffle 8-4 is welded to the side wall of the valve body, one end of the upper horizontal baffle 8-5 is welded to the vertical baffle 8-4, and the lower horizontal baffle 8-6 is welded to the bottom of the valve body 2, and the power mechanism is driven by a cylinder; the operation of the four-way reversing valve 8, the combustion-supporting fan 4, the exhaust fan 5 and the power mechanism is controlled by an automatic controller. The automatic controller of this embodiment adopts PLC or single chip microcomputer.

[0030] Working principle: The third burner 11 is ignited first by the automatic controller, and at the same time, the automatic controller (PLC) controls the four-way reversing valve 8 to cut off the power, the bearing rod 8-1 is reset, and the four-way reversing valve 5 realizes the ventilation passage of the combustion-supporting fan 4 and the conduction of the first inlet and outlet air pipeline 6. The combustion-supporting air blown by the combustion-supporting fan 4 passes through the four-way reversing valve 8 and the first inlet and outlet air pipeline 6 to enter the first heat storage body 2, and enters the furnace 1 through the first heat storage body 2 through the first ventilation channel 12. The automatic controller controls the first burner 10 to start working and the second burner 9 to stop working. When the system is running, natural gas fuel is transported into the furnace, and air passes through the combustion-supporting fan 4 through the four-way reversing valve 8 and the first inlet and outlet air pipeline 6 of the first heat storage body 2 to enter the furnace 1 for premixed combustion. The exhaust gas burned in the furnace 1 is discharged into the factory dust removal system through the second heat storage body 3, the four-way reversing valve 8, and the exhaust fan 5. After the first heat storage body 2 has worked for a period of time, the automatic controller controls the four-way reversing valve 8 to be energized, and the bearing rod 8-1 rotates to realize the ventilation passage of the combustion-supporting fan 4 and the conduction of the second inlet and outlet air duct 7. At this time, the air passes through the combustion-supporting fan 4 through the four-way reversing valve 8, the second heat storage body 3, and the second ventilation channel 13 to enter the furnace 1 for premixing. The automatic controller controls the second burner 9 to start working, and the first burner 10 to stop working. The combustion exhaust gas of the furnace 1 is discharged into the factory dust removal system through the first heat storage body 12, the four-way reversing valve 8, and the exhaust fan 5. When this system is operating normally, the third burner 11 is always in a burning state, and the first burner 10 and the second burner 9 perform a cyclic reciprocating action back and forth until the temperature of the non-ferrous metals in the furnace 1 reaches the production temperature, and the system stops. By the long-lasting flame operation of the third burner 11 and the reciprocating operation of the second burner 9 and the first burner 10, it is ensured that there is always a long-lasting flame in the furnace 1 to avoid deflagration. The second burner 9, the first burner 10 and the third burner 11 work to achieve rapid heating of the furnace 1, and the outlet of the first burner 10 is toward the first air port 16, and the outlet of the second burner 9 is toward the second air port 17, which further effectively solves the problem of poor premixing caused by blockage of the first air port 16 and the second air port 17 due to feeding, and the flue gas emission can meet the low-nitrogen and low-oxygen flue gas emission standards, the overall equipment is easy to maintain, the combustion efficiency is high, the production efficiency is improved, the energy loss is reduced, and the equipment maintenance cost is reduced.

[0031] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is determined by the appended claims.

Claims

1. A regenerative combustion device, comprising a furnace, a first regenerative body, and a second regenerative body, wherein a first air port and a second air port are provided on the furnace, the first regenerative body is connected to the first air port through a first ventilation channel, and the second regenerative body is connected to the second air port through a second ventilation channel, wherein the first regenerative body is connected to the second air port through a second ventilation channel, and the second regenerative body is connected to the second air port through a second ventilation channel, The angle between the first ventilation channel and the first air outlet, and the angle between the second ventilation channel and the second air outlet are both less than 90°. The first ventilation channel and the second ventilation channel are respectively installed with a first burner and a second burner. The outlet of the first burner faces the first air outlet, and the outlet of the second burner faces the second air outlet. A third burner is also installed on the furnace.

2. A regenerative combustion device according to claim 1, characterized in that The outlet direction of the first burner intersects with the ventilation direction of the first ventilation channel at the first air outlet, and the outlet direction of the second burner intersects with the ventilation direction of the second ventilation channel at the second air outlet.

3. A regenerative combustion device according to claim 1, characterized in that The first heat storage body and the second heat storage body are respectively connected to one end of the first inlet and outlet air pipeline and the second inlet and outlet air pipeline, and the other ends of the first inlet and outlet air pipeline and the second inlet and outlet air pipeline are installed on the two gas inlets and outlets of the four-way reversing valve, and the remaining two ports of the four-way reversing valve are respectively connected to the combustion-supporting fan and the exhaust fan.

4. A regenerative combustion device according to claim 1, characterized in that The first heat storage body and the second heat storage body have the same structure and are both cylindrical. A first dust cleaning inspection hole and a second dust cleaning inspection hole are respectively provided under the first heat storage body and the second heat storage body.

5. A regenerative combustion device according to claim 3, characterized in that The four-way reversing valve includes a valve body with four gas inlets and outlets, a bearing rod penetrating the entire height direction of the valve body is provided in the valve body, both ends of the bearing rod are installed on the valve body through bearing seats, the bearing rod is driven to rotate by a power mechanism, a bearing baffle is installed on the bearing rod, the bearing baffle is symmetrically arranged with the bearing rod as the center, four valve cavity baffles for blocking the edges of the bearing baffles are provided on the inner wall of the valve body, the valve cavity baffle includes a vertical baffle and an upper horizontal baffle and a lower horizontal baffle arranged at the upper and lower ends of the vertical baffle, wherein the vertical baffle is welded to the side wall of the valve body, one end of the upper horizontal baffle is welded to the vertical baffle, and the lower horizontal baffle is welded to the bottom of the valve body.

6. A regenerative combustion device according to claim 5, characterized in that The power mechanism is driven by a cylinder.

7. A regenerative combustion device according to claim 6, characterized in that The operations of the four-way reversing valve, the combustion-supporting fan, the exhaust fan and the power mechanism are controlled by an automatic controller.

8. A regenerative combustion device according to claim 7, characterized in that The automatic controller adopts PLC or single chip microcomputer.

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