Low-oxygen combustion-supporting combustion incinerator

Abstract

The utility model discloses a low-oxygen combustion-supporting combustion incinerator. The existing industrial waste gas purification technology mainly comprises desulfurization, denitration and dust removal processes and does not have the function of removing carbon monoxide. The device comprises an industrial waste gas incinerator, a gas burner, an air blower, a combustion-supporting air pipeline, an industrial waste gas inlet pipeline, a normal-temperature air inlet pipeline, a quick switching valve, a high-temperature flue gas outlet pipeline and a circulating flue gas inlet pipeline, the outer wall, close to the bottom, of the incinerator body of the industrial waste gas incinerator is connected with a gas burner and a combustion-supporting air pipeline, the end of the combustion-supporting air pipeline is connected with an outlet of an air blower, and an inlet of the air blower is connected with an outlet of a rapid switching valve. And two inlets of the quick switching valve are respectively connected with an outlet of the normal-temperature air inlet pipeline and an outlet of the industrial waste gas inlet pipeline. A low-oxygen oxidation technology is adopted according to a combustion system, so that carbon monoxide in industrial waste gas is efficiently removed, and the problem is solved. The utility model is applied to the field of waste gas emission of incinerators.

Description

Technical Field

[0001] The utility model relates to the field of boilers, and particularly relates to an incinerator for low-oxygen assisted combustion. Background Art

[0002] An incinerator is a furnace used to burn and treat harmful substances (ordinary harmful substances, hazardous waste) by the exothermic reaction of combustible substances in a combustion chamber. The combustion-supporting air used in ordinary incinerators is generally air, oxygen-enriched air or pure oxygen. The combustion-supporting air and the combustible substances burn in the incinerator to generate high-temperature flue gas. In actual production, continuous operation should be maintained to avoid frequent large-scale temperature increases and decreases, which is a kind of protection for the equipment. In actual production, the equipment that generates industrial waste gas does not operate continuously and will run and stop with the adjustment of the production rhythm, which means that the industrial waste gas cannot be continuously supplied into the industrial waste gas incinerator.

[0003] At present, the incinerator technology cannot use flue gas with an oxygen concentration significantly lower than that of air oxygen as the combustion-supporting air to achieve stable and sufficient incineration of combustible substances in the incinerator. The oxygen content in the industrial waste gas generated in the industrial field is between 12% and 16%, which is lower than the oxygen content of 21% in the air, and the waste gas generally contains 0.5% - 1% of carbon monoxide. The existing industrial waste gas purification technologies mainly include desulfurization, denitrification and dust removal processes, and are discharged after reaching the emission standards, without the function of removing carbon monoxide. In actual production, if a large amount of carbon monoxide is not thoroughly treated, it will also cause pollution to the atmospheric environment. Summary of the Utility Model

[0004] In order to solve the problem that the existing industrial waste gas purification technologies mainly include desulfurization, denitrification and dust removal processes, and are discharged after reaching the emission standards, without the function of removing carbon monoxide, the utility model provides an incinerator for low-oxygen assisted combustion.

[0005] The technical solution of the utility model is as follows:

[0006] An incinerator for low-oxygen assisted combustion, characterized by comprising an industrial waste gas incinerator, a gas burner, a blower, a combustion-supporting air pipeline, an industrial waste gas inlet pipeline, a normal-temperature air inlet pipeline, a quick-switching valve, a high-temperature flue gas outlet pipeline and a circulating flue gas inlet pipeline;

[0007] The outer wall of the industrial waste gas incinerator near the bottom is respectively connected to a gas burner and a combustion-supporting air pipeline. Among them, the end of the combustion-supporting air pipeline is connected to the outlet of a blower, the inlet of the blower is connected to the outlet of a quick-switching valve, the two inlets of the quick-switching valve are respectively connected to the outlet of a normal-temperature air inlet pipeline and the outlet of an industrial waste gas inlet pipeline, a circulating flue gas inlet pipeline is installed between the normal-temperature air inlet pipeline and the high-temperature flue gas outlet pipeline, and the high-temperature flue gas outlet pipeline is installed at the top of the industrial waste gas incinerator.

[0008] Preferably, the quick-switching valve includes a first inlet, a second inlet, an outlet, a first driving device and a second driving device. The first inlet is connected to the industrial waste gas inlet pipeline, the second inlet is connected to the normal-temperature air inlet pipeline, and the outlet is connected to the blower;

[0009] The first driving device corresponds to the first inlet, and the second driving device corresponds to the second inlet.

[0010] Preferably, when the first driving device lifts and the second driving device descends, the first inlet and the outlet are communicated at this time.

[0011] Preferably, when the first driving device descends and the second driving device lifts, the second inlet and the outlet are communicated at this time.

[0012] Preferably, the gas burner is a device that burns through gas, and heat is provided to the industrial waste gas incinerator through the combustion of the gas burner.

[0013] Preferably, the combustion-supporting air pipeline is a channel for providing combustion-supporting air for the combustion of the gas burner. After the combustion-supporting air is pressurized by the blower, it is introduced into the lower space of the industrial waste gas incinerator and mixed with the gas for combustion.

[0014] Preferably, the industrial waste gas inlet pipeline is a channel for industrial waste gas to enter the combustion system, and the inlet of the industrial waste gas inlet pipeline is connected to the equipment that generates industrial waste gas.

[0015] Preferably, the normal-temperature air inlet pipeline is a channel for normal-temperature air to enter the combustion system when it is used as combustion-supporting air. The inlet of the normal-temperature air inlet pipeline is connected to the atmosphere, and its outlet is connected to the quick-switching valve.

[0016] Preferably, the high-temperature flue gas outlet pipeline is a flue gas channel of the industrial waste gas incinerator. After the industrial waste gas is purified by removing carbon monoxide, the high-temperature flue gas is discharged through the high-temperature flue gas outlet pipeline.

[0017] Preferably, the industrial waste gas incinerator treats carbon monoxide in industrial waste gas, and the industrial waste gas is subjected to the first desulfurization and the first denitrification through the industrial waste gas incinerator.

[0018] The utility model has the following effects compared with the prior art:

[0019] 1. The incinerator of the utility model adopts low-oxygen combustion-supporting technology, uses industrial waste gas to replace combustion-supporting air to ensure stable combustion, and at the same time burns carbon monoxide in the industrial waste gas through low-oxygen oxidation. The carbon monoxide removal rate can reach more than 99.9%, almost completely removed, achieving the purpose of high-efficiency purification; at the same time, with the rapid switching valve, the continuous and stable operation of the system is realized.

[0020] 2. The industrial waste gas emission temperature of the utility model is generally about 150 °C. Using industrial waste gas as combustion-supporting air can effectively utilize the sensible heat of industrial waste gas, which is convenient for later waste heat utilization.

[0021] 3. The combustion system of the utility model adopts low-oxygen oxidation technology, uses industrial waste gas as combustion-supporting air for the combustion system, which not only effectively utilizes the oxygen in the industrial waste gas, but also ensures that at a certain temperature, the carbon monoxide in the industrial waste gas is efficiently removed; when the process generating industrial waste gas stops operating, through the switching of the rapid switching valve, the continuous and stable operation of the purification system can be ensured.

[0022] 4. The utility model is provided with a rapid switching valve. When there is no industrial waste gas supplied, it can supply combustion-supporting air in the way of normal-temperature air + flue gas circulation; after the process generating industrial waste gas operates normally, the rapid switching valve can close the normal-temperature air + flue gas recirculation, and realize the supply of combustion-supporting air to the entire combustion system by industrial waste gas.

[0023] 5. When the upstream equipment of the utility model operates normally, the industrial waste gas generated by the process enters the combustion system through the industrial waste gas inlet pipe. After being pressurized by the blower, it enters the lower part of the industrial waste gas incinerator through the combustion-supporting air pipe; the heat generated by the gas burner is mixed with the industrial waste gas in the lower part, and combines with the oxygen component in the industrial waste gas to burn, and the generated heat maintains the temperature inside the industrial waste gas incinerator; the carbon monoxide component in the industrial waste gas enters the industrial waste gas incinerator, and at high temperature, combines with the remaining oxygen in the industrial waste gas to produce carbon dioxide, thereby realizing the removal of carbon monoxide in the industrial waste gas; the industrial waste gas after removing carbon monoxide is discharged through the high-temperature flue gas outlet pipe and further purified.

[0024] 6. When the upstream equipment of the present utility model stops, through the switching of the quick switching valve 7, the blower is communicated with the normal temperature air inlet pipe, and the normal temperature air is used as the combustion-supporting air to mix and burn with the gas. Since the oxygen content in the normal temperature air is 21%, in order to achieve low-oxygen combustion, at this time, the circulating flue gas inlet pipe is opened, and the flue gas is mixed with the normal temperature air, and finally the oxygen content of the combustion-supporting air entering the industrial waste gas incinerator is maintained between 12% and 16% to achieve low-oxygen combustion. The high-temperature flue gas generated by combustion is discharged through the high-temperature flue gas outlet pipe. Description of the Drawings

[0025] Figure 1 is a schematic structural diagram of the present utility model;

[0026] Figure 2 is a schematic diagram when the first inlet and the outlet in the quick switching valve are connected.

[0027] Figure 3 is a schematic diagram when the second inlet and the outlet in the quick switching valve are connected.

[0028] 1. Industrial waste gas incinerator, 2. Gas burner, 3. Blower, 4. Combustion-supporting air pipe, 5. Industrial waste gas inlet pipe, 6. Normal temperature air inlet pipe, 7. Quick switching valve, 8. High-temperature flue gas outlet pipe, 9. Circulating flue gas inlet pipe, 7-1. First inlet, 7-2. Second inlet, 7-3. Outlet, 7-4. First driving device, 7-5. Second driving device. Detailed Embodiments

[0029] In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the following will combine the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention. Detailed Embodiment 1:

[0031] Combined with Figure 1 and Figure 2Describing this embodiment, an incinerator for low-oxygen assisted combustion in this embodiment includes an industrial waste gas incinerator 1, a gas burner 2, a blower 3, a combustion-supporting air duct 4, an industrial waste gas inlet duct 5, a normal-temperature air inlet duct 6, a quick-switching valve 7, a high-temperature flue gas outlet duct 8, and a circulating flue gas inlet duct 9. The outer wall of the industrial waste gas incinerator 1 near the bottom is respectively connected to the gas burner 2 and the combustion-supporting air duct 4. Among them, the end of the combustion-supporting air duct 4 is connected to the outlet of the blower 3, the inlet of the blower 3 is connected to the outlet of the quick-switching valve 7, the two inlets of the quick-switching valve 7 are respectively connected to the outlet of the normal-temperature air inlet duct 6 and the outlet of the industrial waste gas inlet duct 5. A circulating flue gas inlet duct 9 is installed between the normal-temperature air inlet duct 6 and the high-temperature flue gas outlet duct 8, and the high-temperature flue gas outlet duct 8 is installed at the top of the industrial waste gas incinerator 1.

[0032] The industrial waste gas incinerator 1 is the main equipment for treating carbon monoxide in industrial waste gas. At the same time, it can also carry out the first desulfurization and the first denitrification of industrial waste gas to meet the function of preliminary purification. This equipment is an adiabatic space, and its furnace form is not limited to a membrane-type furnace structure. It can keep the internal temperature between 850 - 1050 °C. At this temperature, almost all of the carbon monoxide in the industrial waste gas can be oxidized into carbon dioxide, thereby realizing the removal of carbon monoxide in the industrial waste gas. The blower 3 is a pressurizing device. Its inlet is connected to the quick-switching valve 7, and its outlet is connected to the combustion-supporting air duct 4.

[0033] The circulating flue gas inlet duct 9 is used to balance the oxygen content in normal-temperature air with flue gas, so that the oxygen content finally entering the industrial waste gas incinerator 1 remains between 12% - 16%.

[0034] The gas burner 2 burns with the combustion-supporting air of industrial waste gas. The gas and the oxygen in the industrial waste gas burn to provide a large amount of heat for the industrial waste gas incinerator 1, realizing the temperature requirement for the conversion of carbon monoxide in the industrial waste gas into carbon dioxide.

[0035] The content of carbon monoxide in industrial waste gas is between 0.5% - 1%, and the oxygen content is between 12% - 16%. At a certain temperature of about 650 °C, it can be oxidized into carbon dioxide. The industrial waste gas itself already has the gas conditions. Only by providing a certain temperature can carbon monoxide be converted into carbon dioxide to realize the removal of carbon monoxide.

[0036] Since industrial waste gases (including sintering flue gas, converter off-gas, VOCs gas, carbon material drying flue gas, reduced titanium flue gas, etc.) contain other harmful components such as sulfur dioxide, nitrogen oxides, and particulate matter, they cannot be directly discharged into the atmosphere before purification. To more efficiently purify industrial waste gases, this technology first performs primary desulfurization and primary denitrification on industrial waste gases in the industrial waste gas incinerator 1 to preliminarily reduce the content of sulfur dioxide and nitrogen oxides. Subsequently, other equipment will perform secondary removal of sulfur dioxide and nitrogen oxides, and at the same time, utilize waste heat. Specific Embodiment 2:

[0038] Combined with Figure 2 and Figure 3 This embodiment is described. An incinerator for low-oxygen assisted combustion, the quick switching valve 7 includes a first inlet 7-1, a second inlet 7-2, an outlet 7-3, a first driving device 7-4, and a second driving device 7-5. The first inlet 7-1 is connected to the industrial waste gas inlet pipe 5, the second inlet 7-2 is connected to the normal temperature air inlet pipe 6, and the outlet 7-3 is connected to the blower 3;

[0039] The first driving device 7-4 corresponds to the first inlet 7-1, and the second driving device 7-5 corresponds to the second inlet 7-2.

[0040] The quick switching valve 7 is a device for quickly switching or reasonably proportioning industrial waste gas and normal temperature air. Its function is to adjust which gas enters the combustion system. Its inlet is connected to the industrial waste gas inlet pipe 5 and the normal temperature air inlet pipe 6, and its outlet is connected to the blower 3. Specific Embodiment 3:

[0042] Combined with Figure 2 and Figure 3 This embodiment is described. An incinerator for low-oxygen assisted combustion, when the first driving device 7-4 is lifted and the second driving device 7-5 is lowered, at this time, the first inlet 7-1 and the outlet 7-3 are communicated; Specific Embodiment 4:

[0044] Combined with Figure 2 and Figure 3 This embodiment is described. An incinerator for low-oxygen assisted combustion, when the first driving device 7-4 is lowered and the second driving device 7-5 is lifted, at this time, the second inlet 7-2 and the outlet 7-3 are communicated.

[0045] By setting up the quick-switching valve 7, when there is no industrial waste gas supplied, the combustion-supporting air can be supplied in the way of normal-temperature air plus flue gas circulation to provide combustion-supporting air for the whole system; after the process of generating industrial waste gas operates normally, the quick-switching valve 7 can close the normal-temperature air + flue gas recirculation, and the industrial waste gas provides combustion-supporting air for the whole combustion system. Specific Embodiment Five:

[0047] Combined with Figure 1 Describe this embodiment. An incinerator for low-oxygen combustion-supporting combustion in this embodiment, the gas burner 2 is a device that burns gas, and provides heat to the industrial waste gas incinerator 1 through the combustion of the gas burner 2.

[0048] The gas burner 2 is a device that burns gas, provides heat to the industrial waste gas incinerator 1 through combustion, and keeps the temperature in the industrial waste gas incinerator 1 between 850 - 1050 °C. Specific Embodiment Six:

[0050] Combined with Figure 1 Describe this embodiment. An incinerator for low-oxygen combustion-supporting combustion in this embodiment, the combustion-supporting air pipeline 4 is a channel for providing combustion-supporting air for the combustion of the gas burner 2. After the combustion-supporting air is pressurized by the blower 3, it is introduced into the lower space of the industrial waste gas incinerator and mixed with gas for combustion.

[0051] The combustion-supporting air pipeline 4 is a channel for providing combustion-supporting air for the combustion of the gas burner. Its inlet is connected to the blower 3, and its outlet is connected to the lower space of the industrial waste gas incinerator 1. After the combustion-supporting air is pressurized by the blower 3, it is introduced into the lower space of the industrial waste gas incinerator 1 and mixed with gas for combustion; Specific Embodiment Seven:

[0053] Combined with Figure 1 Describe this embodiment. An incinerator for low-oxygen combustion-supporting combustion in this embodiment, the industrial waste gas inlet pipeline 5 is a channel for industrial waste gas to enter the combustion system, and the inlet of the industrial waste gas inlet pipeline 5 is connected to the equipment that generates industrial waste gas. Specific Embodiment Eight:

[0055] Combined with Figure 1 Describe this embodiment. An incinerator for low-oxygen combustion-supporting combustion in this embodiment, the normal-temperature air inlet pipeline 6 is a channel for normal-temperature air to enter the combustion system when it is used as combustion-supporting air. The inlet of the normal-temperature air inlet pipeline 6 is connected to the atmosphere, and its outlet is connected to the quick-switching valve 7. Specific Embodiment Nine:

[0057] Combined with Figure 1Description of this embodiment. An incinerator for low-oxygen assisted combustion according to this embodiment. The high-temperature flue gas outlet pipe 8 is the flue gas passage of the industrial waste gas incinerator 1. After the industrial waste gas is purified by removing carbon monoxide, the high-temperature flue gas is discharged through the high-temperature flue gas outlet pipe 8. Specific Embodiment Ten:

[0059] Combined with Figure 1 and Figure 2 Description of this embodiment. An incinerator for low-oxygen assisted combustion according to this embodiment. The industrial waste gas incinerator 1 treats carbon monoxide in industrial waste gas, and performs the first desulfurization and the first denitrification on the industrial waste gas through the industrial waste gas incinerator 1.

[0060] Working Principle:

[0061] When the upstream equipment is operating normally, the process of the combustion system:

[0062] The industrial waste gas generated by the process enters the combustion system through the industrial waste gas inlet pipe 5. After being pressurized by the blower 3, it enters the lower part of the industrial waste gas incinerator 1 through the combustion-supporting air pipe 4. The heat generated by the gas burner 2 is mixed with the industrial waste gas in the lower part, and then burns in combination with the oxygen component in the industrial waste gas, and the generated heat maintains the temperature inside the industrial waste gas incinerator 1. The carbon monoxide component in the industrial waste gas enters the industrial waste gas incinerator 1, and under high-temperature conditions, combines with the remaining oxygen in the industrial waste gas to produce carbon dioxide, thereby realizing the removal of carbon monoxide in the industrial waste gas. The industrial waste gas after removing carbon monoxide is discharged through the high-temperature flue gas outlet pipe 8 and further purified, mainly including secondary desulfurization, secondary denitrification and dust removal processes, and at the same time, waste heat utilization is carried out.

[0063] When the upstream equipment stops, the process of the combustion system:

[0064] When the process stops, through the switching of the quick-switching valve 7, the blower 3 is connected to the normal-temperature air inlet pipe 6, and the normal-temperature air is used as the combustion-supporting air to be mixed with the gas for combustion. Since the oxygen content in the normal-temperature air is 21%, in order to achieve low-oxygen combustion, at this time, the circulating flue gas inlet pipe 9 is opened, and the flue gas is used to mix with the normal-temperature air, and finally the oxygen content of the combustion-supporting air entering the industrial waste gas incinerator 1 is maintained between 12% and 16%, realizing low-oxygen combustion. The high-temperature flue gas generated by the combustion is discharged through the high-temperature flue gas outlet pipe 8 and further purified and waste heat is utilized.

[0065] The above are only the preferred embodiments of the present invention and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the relevant art can make some changes or modifications to the above-disclosed technical content to obtain equivalent embodiments with equivalent changes within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention and is based on the technical essence of the present invention, any simple modification, equivalent replacement, and improvement made to the above embodiments still fall within the protection scope of the technical solution of the present invention.

Claims

1. An incinerator for low-oxygen assisted combustion, characterized in that, It includes an industrial waste gas incinerator (1), a gas burner (2), a blower (3), a combustion-supporting air pipeline (4), an industrial waste gas inlet pipeline (5), a normal-temperature air inlet pipeline (6), a quick-switching valve (7), a high-temperature flue gas outlet pipeline (8) and a recycled flue gas inlet pipeline (9); The outer wall of the industrial waste gas incinerator (1) near the bottom is respectively connected to the gas burner (2) and the combustion-supporting air pipeline (4). Among them, the end of the combustion-supporting air pipeline (4) is connected to the outlet of the blower (3), the inlet of the blower (3) is connected to the outlet of the quick-switching valve (7), the two inlets of the quick-switching valve (7) are respectively connected to the outlet of the normal-temperature air inlet pipeline (6) and the outlet of the industrial waste gas inlet pipeline (5), a recycled flue gas inlet pipeline (9) is installed between the normal-temperature air inlet pipeline (6) and the high-temperature flue gas outlet pipeline (8), and the high-temperature flue gas outlet pipeline (8) is installed at the top of the industrial waste gas incinerator (1).

2. The incinerator for low-oxygen assisted combustion according to claim 1, characterized in that, The quick-switching valve (7) includes a first inlet (7-1), a second inlet (7-2), an outlet (7-3), a first driving device (7-4) and a second driving device (7-5). The first inlet (7-1) is connected to the industrial waste gas inlet pipeline (5), the second inlet (7-2) is connected to the normal-temperature air inlet pipeline (6), and the outlet (7-3) is connected to the blower (3); The first driving device (7-4) corresponds to the first inlet (7-1), and the second driving device (7-5) corresponds to the second inlet (7-2).

3. The incinerator for low-oxygen assisted combustion according to claim 2, characterized in that, When the first driving device (7-4) ascends and the second driving device (7-5) descends, at this time, the first inlet (7-1) and the outlet (7-3) are communicated.

4. The incinerator for low-oxygen assisted combustion according to claim 2 or 3, characterized in that When the first driving device (7-4) descends and the second driving device (7-5) ascends, at this time, the second inlet (7-2) and the outlet (7-3) are communicated.

5. The incinerator for low-oxygen assisted combustion according to claim 2 or 3, characterized in that, The first driving device (7-4) and the second driving device (7-5) include a sealing plate and a pressing rod. The pressing rod is vertically and fixedly connected to the center of the sealing plate, and the sealing plate is pushed by the pressing rod to block the first inlet (7-1) or the second inlet (7-2).

6. The incinerator for low-oxygen assisted combustion according to claim 1, characterized in that, The combustion-supporting air pipeline (4) is a channel for providing combustion-supporting air for the combustion of the gas burner (2). After the combustion-supporting air is pressurized by the blower (3), it is introduced into the lower space of the industrial waste gas incinerator and mixed with the gas for combustion.

7. The incinerator for low-oxygen assisted combustion according to claim 1, characterized in that The industrial waste gas inlet pipeline (5) is a channel for industrial waste gas to enter the combustion system. The inlet of the industrial waste gas inlet pipeline (5) is connected to the equipment that generates industrial waste gas.

8. The incinerator for low-oxygen assisted combustion according to claim 1, characterized in that, The normal-temperature air inlet pipeline (6) is a channel for normal-temperature air to enter the combustion system when it is used as combustion-supporting air. The inlet of the normal-temperature air inlet pipeline (6) is connected to the atmosphere, and its outlet is connected to the quick-switching valve (7).

9. The incinerator for low-oxygen assisted combustion according to claim 1, characterized in that, The high-temperature flue gas outlet pipeline (8) is a flue gas channel of the industrial waste gas incinerator (1). After the industrial waste gas is purified by removing CO, the high-temperature flue gas is discharged through the high-temperature flue gas outlet pipeline (8).

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