Energy-saving waste gas incineration system

Abstract

The utility model relates to the technical field of waste gas treatment, and provides an energy-saving waste gas incineration system which comprises a first waste gas buffer tank, a second waste gas buffer tank, an arc-shaped plate heat exchanger, an incinerator, a flue gas reheater, a desulfurizing tower and a chimney. The arc-shaped plate heat exchanger is arranged at the tail end of the incinerator, a combustor is arranged at the front end of the incinerator, and a spraying atomizer spraying water towards the front end is arranged in the incinerator. The first waste gas buffer tank is communicated with the arc-shaped plate heat exchanger; the arc-shaped plate heat exchanger is communicated with the front end of the incinerator through a pipeline; the second waste gas buffer tank is communicated with the front end of the incinerator; hydrocarbon-containing waste gas is introduced into the first waste gas buffer tank, and waste gas containing auto-polymers or mixed waste gas containing auto-polymers and hydrocarbon is introduced into the second waste gas buffer tank; and an exhaust port at the tail end of the incinerator is connected with the flue gas reheater, and the flue gas reheater is connected with the desulfurization tower and the chimney. And waste gas with different properties is introduced into the incinerator through different routes, so that multiple sets of waste gas treatment requirements can be met at the same time.

Description

Technical Field

[0001] This application belongs to the technical field of waste gas treatment, and more specifically, relates to an energy-saving waste gas incineration system. Background Art

[0002] During the processes of petroleum refining, chemical production, and product storage, waste gas will be generated. The waste gas generated during the refining production process mainly contains hydrocarbons, hydrogen sulfide, water vapor, and air. Chemical plants such as styrene generate waste gas containing styrene and other substances that can produce self-polymers in the storage products of their tank farms. Direct emission will pollute the atmospheric environment and affect the health of operators. It needs to be treated to meet the standards before emission. The above waste gases are all flammable, but due to the small total amount and unstable organic matter content in the waste gas, direct combustion cannot be achieved. When using incineration treatment, fuel needs to be added to maintain the furnace temperature, and after the pollutants are completely decomposed, they are discharged up to the standard.

[0003] Currently, the waste gas treatment technologies mainly include low-temperature catalytic combustion, low-temperature regenerative catalytic combustion method, and high-temperature regenerative incineration method. Currently, these methods all have some problems: The catalytic combustion method has large investment, high energy consumption, and high operating costs. When the hydrocarbon content in the waste gas reaches a certain concentration, deflagration will occur, posing a safety hazard; The high-temperature regenerative incineration method is applicable to waste gas with stable concentration and large gas volume. The treatment cost for waste gas with small gas volume and large concentration fluctuation is high, and the operation is unstable. In addition, for the treatment of chemical waste gas containing benzene series, it is difficult for catalytic combustion to achieve full compliance, and in the high-temperature regenerative incineration method, the local temperature of the regenerator is prone to be too high or the self-polymer cannot be completely burned, resulting in non-compliance emissions. Summary of the Utility Model

[0004] Aiming at the deficiencies of the above-mentioned existing technologies, the purpose of the embodiment of this application is to provide an energy-saving waste gas incineration system that can simultaneously treat waste gas containing hydrocarbons and self-polymers.

[0005] To achieve the above purpose, the technical solution adopted by this application is: Provide an energy-saving waste gas incineration system, including: a first waste gas buffer tank, a second waste gas buffer tank, an arc plate heat exchanger, an incinerator, a flue gas reheater, a desulfurization tower, and a chimney;

[0006] The arc plate heat exchanger is arranged at the tail end of the incinerator, a burner is arranged at the front end of the incinerator, and a spray atomizer for spraying water towards the front end is arranged in the incinerator;

[0007] The first waste gas buffer tank is communicated with the arc plate heat exchanger, and the arc plate heat exchanger is communicated with the front end of the incinerator through a pipeline;

[0008] The second waste gas buffer tank is communicated with the front end of the incinerator; hydrocarbon-containing waste gas is introduced into the first waste gas buffer tank, and waste gas containing self-polymer or a mixed waste gas containing self-polymer and hydrocarbon is introduced into the second waste gas buffer tank; the exhaust port at the tail end of the incinerator is connected to a flue gas reheater, and the flue gas reheater is connected to the desulfurization tower and the chimney.

[0009] In one embodiment, a first waste gas induced draft fan is provided on the pipeline connecting the first waste gas buffer tank and the arc plate heat exchanger, and a second waste gas induced draft fan is provided on the pipeline connecting the second waste gas buffer tank and the incinerator.

[0010] In one embodiment, an auxiliary combustion air blower is further connected to the front end of the incinerator.

[0011] In one embodiment, the first waste gas induced draft fan, the second waste gas induced draft fan and the auxiliary combustion air blower are all variable frequency centrifugal fans.

[0012] In one embodiment, a first air inlet is provided at the top of the flue gas reheater, and a first air outlet communicated with the first air inlet is provided at the bottom; a second air inlet is provided at the lower side of the flue gas reheater, and a second air outlet communicated with the second air inlet is provided at the upper side of the flue gas reheater. The first air inlet is connected to the exhaust port of the incinerator, the first air outlet is connected to the lower end of the desulfurization tower, the second air inlet is connected to the top of the desulfurization tower, and a liquid pocket is provided at the lowest corner of the connecting pipeline. The second air outlet is connected to the bottom of the chimney.

[0013] In one embodiment, a flue gas induced draft fan is provided on the connecting pipeline between the first air outlet and the desulfurization tower.

[0014] In one embodiment, the desulfurization tower is connected with a circulating spray assembly, and the circulating spray assembly includes a circulating pump, a spray pipe and a spray head; a demister is arranged inside the upper part of the desulfurization tower.

[0015] In one embodiment, the circulating pump is a centrifugal pump, and a basket type filter is arranged at the inlet of the circulating pump.

[0016] In one embodiment, the outlet end of the flue gas induced draft fan is further connected to the front end of the incinerator through a reflux gas pipe.

[0017] The beneficial effects of the energy-saving waste gas incineration system provided by the present application are as follows:

[0018] 1. By introducing waste gas with different properties into the incinerator through different routes, multiple sets of waste gas treatment requirements can be solved simultaneously;

[0019] 2. By adopting a combination of multi-stage heat exchange methods, the heat energy in the flue gas after waste gas incineration can be recovered, and the consumption of auxiliary combustion fuel can be reduced;

[0020] 3. The arc plate heat exchanger and the incinerator are made as a whole, and the heated waste gas is directly sent into the incinerator for combustion through a pipeline, making the equipment structure more compact;

[0021] 4. Part of the low-temperature flue gas is sent into the combustion air duct of the incinerator through the flue gas induced draft fan and the reflux gas pipe. On the one hand, it can reduce the generation of nitrogen oxides in the incinerator, and on the other hand, it can recover the low-grade heat energy in the flue gas and save fuel. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a simplified structural schematic diagram of the energy-saving waste gas incineration system provided by the embodiment of the present application.

[0024] Among them, the reference numerals in the drawings are as follows:

[0025] 1. First waste gas buffer tank; 2. Second waste gas buffer tank; 3. First waste gas induced draft fan; 4. Second waste gas induced draft fan; 5. Arc plate heat exchanger; 6. Incinerator; 7. Combustion air blower; 8. Flue gas reheater; 9. Flue gas induced draft fan; 10. Desulfurization tower; 11. Circulation pump; 12. Chimney. Detailed Embodiments

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the following further details the present application in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0027] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0028] It should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0029] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0030] As Figure 1 shown, a description is now given of an energy-saving waste gas incineration system provided by an embodiment of the present application. The energy-saving waste gas incineration system includes: a first waste gas buffer tank 1, a second waste gas buffer tank 2, an arc plate heat exchanger 5, an incinerator 6, a flue gas reheater 8, a desulfurization tower 10, and a chimney 12. Among them, the arc plate heat exchanger 5 is arranged at the tail end of the incinerator 6, and the arc plate heat exchanger 5 and the incinerator 6 are of an integral structure. A burner is provided at the front end of the incinerator 6, and external air and fuel can be burned through the burner to burn the waste gas. A spray atomizer for spraying water towards the front end is provided in the incinerator 6; the spray atomizer is used to cool the high-temperature flue gas generated after combustion, for quenching the high-temperature flue gas, protecting downstream equipment from high-temperature impact, and at the same time controlling the preheating temperature of the hydrocarbon-containing waste gas.

[0031] Specifically, the first waste gas buffer tank 1 is communicated with the arc plate heat exchanger 5, the arc plate heat exchanger 5 is communicated with the front end of the incinerator 6 through a pipeline, and hydrocarbon-containing waste gas is introduced into the first waste gas buffer tank 1. The second waste gas buffer tank 2 is communicated with the front end of the incinerator 6; waste gas containing self-polymer or a mixed waste gas containing self-polymer and hydrocarbon is introduced into the second waste gas buffer tank 2. After the hydrocarbon-containing waste gas is preheated by the arc plate heat exchanger 5, it is sent through a pipeline to the first waste gas inlet at the front end of the incinerator 6, and then burned through the burner; the waste gas containing self-polymer is directly sent through a pipeline to the second waste gas inlet at the front end of the incinerator 6, and then burned through the burner. The flue gas generated by combustion is exchanged heat by the arc plate heat exchanger 5 at the tail end of the incinerator 6 and then discharged through the exhaust port, and then introduced into the flue gas reheater 8 to further recover heat. The flue gas reheater 8 is connected to the desulfurization tower 10 and the chimney 12, and the flue gas is desulfurized and then discharged into the atmosphere. The first waste gas inlet and the second waste gas inlet are separately arranged, and different types of waste gas can be separately introduced or different types of waste gas can be introduced simultaneously, realizing the effective treatment of various waste gases.

[0032] Preferably, a first waste gas induced draft fan 3 is provided on the pipeline connecting the first waste gas buffer tank 1 and the arc plate heat exchanger 5, and a second waste gas induced draft fan 4 is provided on the pipeline connecting the second waste gas buffer tank 2 and the incinerator 6. The first waste gas induced draft fan 3 and the second waste gas induced draft fan 4 are used to pressurize the waste gas to realize the flow of the waste gas. For example, when treating hydrocarbon-containing waste gas alone, the first waste gas induced draft fan 3 works and the second waste gas induced draft fan 4 does not work; when treating self-polymer-containing waste gas alone, the first waste gas buffer tank is closed, and the first waste gas induced draft fan 3 can introduce air into the arc plate heat exchanger 5 alone for preheating, and cooperate with the second induced draft fan 4 to treat the self-polymer-containing waste gas; when treating hydrocarbon-containing waste gas and self-polymer-containing waste gas at the same time, the first waste gas induced draft fan 3 and the second waste gas induced draft fan 4 work at the same time. A combustion-supporting fan 7 is also connected to the front end of the incinerator 6, and the combustion-supporting fan 7 is used to control the amount of air entering the burner. Therefore, in order to control the air volume of the waste gas and air, the first waste gas induced draft fan 3, the second waste gas induced draft fan 4 and the combustion-supporting fan 7 are all variable-frequency centrifugal fans.

[0033] Preferably, in order to further recover heat, the top of the flue gas reheater 8 is provided with a first air inlet, and the bottom is provided with a first air outlet communicating with the first air inlet; the lower side of the flue gas reheater 8 is provided with a second air inlet, and the upper side of the flue gas reheater 8 is provided with a second air outlet communicating with the second air inlet. The first air inlet is connected to the exhaust port of the incinerator 6, the first air outlet is connected to the lower end of the desulfurization tower 10, the second air inlet is connected to the top of the desulfurization tower 10, and a liquid pocket is provided at the lowest corner of the connecting pipeline, and the second air outlet is connected to the bottom of the chimney 12. The flue gas after heat exchange by the arc plate heat exchanger 5 in the incinerator 6 enters the flue gas reheater 8 through the first air inlet for heat exchange, and then the flue gas enters the desulfurization tower 10 through the first air outlet for desulfurization. The desulfurized flue gas enters the flue gas reheater 8 again through the second air inlet for heat exchange, and then is discharged into the chimney 12 through the second air outlet, and finally is discharged into the atmosphere through the chimney 12. The flue gas reheater 8 adopts a cast iron plate type flue gas reheater 8, which can resist dew point corrosion of low-temperature flue gas, and can work normally even if the flue gas temperature is below 100°C for a long time.

[0034] Among them, the liquid pocket is used to collect the moisture in the flue gas discharged from the desulfurization tower 10. A flue gas induced draft fan 9 is provided on the connecting pipeline between the first air outlet and the desulfurization tower 10 to provide power for the flow of the flue gas. The flue gas induced draft fan 9 also adopts a variable-frequency centrifugal fan, which is connected in series with the first waste gas induced draft fan 3 and the second waste gas induced draft fan 4 to adapt to the fluctuations of the waste gas volume and flue gas volume.

[0035] Among them, the desulfurization tower 10 is connected with a circulating spray assembly for realizing the circulating spray of the spray liquid. The circulating spray assembly includes a circulating pump 11, a spray pipe and a spray head; a demister is arranged inside the upper part of the desulfurization tower 10. The circulating pump 11 is a centrifugal pump, and a basket filter is arranged at the inlet of the circulating pump 11.

[0036] Preferably, the outlet end of the flue gas induced draft fan 9 is also connected to the front end of the incinerator 6 through a reflux gas pipe and introduced into the burner. In this embodiment, after the flue gas passes through two-stage heat exchange, most of the flue gas is sent into the desulfurization tower 10 by the flue gas induced draft fan 9, and a small amount of the flue gas is sent back to the burner through the reflux gas pipe and mixed into the combustion-supporting air, so as to achieve the flue gas reflux to reduce the generation of oxides during the combustion process and reduce the fuel consumption.

[0037] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. An energy-saving waste gas incineration system, characterized in that, Including: A first waste gas buffer tank (1), a second waste gas buffer tank (2), an arc plate heat exchanger (5), an incinerator (6), a flue gas reheater (8), a desulfurization tower (10) and a chimney (12); The arc plate heat exchanger (5) is arranged at the tail end of the incinerator (6). A burner is provided at the front end of the incinerator (6), and a spray atomizer for spraying water towards the front end is arranged in the incinerator (6); The first waste gas buffer tank (1) is communicated with the arc plate heat exchanger (5), and the arc plate heat exchanger (5) is communicated with the front end of the incinerator (6) through a pipeline; The second waste gas buffer tank (2) is communicated with the front end of the incinerator (6); hydrocarbon-containing waste gas is introduced into the first waste gas buffer tank (1), waste gas containing self-polymer or a mixed waste gas containing self-polymer and hydrocarbon is introduced into the second waste gas buffer tank (2); the exhaust port at the tail end of the incinerator (6) is connected to the flue gas reheater (8), and the flue gas reheater (8) is connected to the desulfurization tower (10) and the chimney (12).

2. The energy-saving waste gas incineration system according to claim 1, wherein: A first waste gas induced draft fan (3) is provided on the pipeline where the first waste gas buffer tank (1) is communicated with the arc plate heat exchanger (5), and a second waste gas induced draft fan (4) is provided on the pipeline where the second waste gas buffer tank (2) is communicated with the incinerator (6).

3. The energy-saving waste gas incineration system according to claim 2, wherein: An auxiliary combustion fan (7) is also connected to the front end of the incinerator (6).

4. The energy-saving waste gas incineration system according to claim 3, wherein: The first waste gas induced draft fan (3), the second waste gas induced draft fan (4) and the auxiliary combustion fan (7) are all variable-frequency centrifugal fans.

5. The energy-saving waste gas incineration system according to any one of claims 1-4, characterized in that: The top of the flue gas reheater (8) is provided with a first air inlet, and the bottom is provided with a first air outlet communicated with the first air inlet; a second air inlet is provided on the side surface at the lower end of the flue gas reheater (8), and a second air outlet communicated with the second air inlet is provided on the side surface at the upper end of the flue gas reheater (8). The first air inlet is connected to the exhaust port of the incinerator (6), the first air outlet is connected to the lower end of the desulfurization tower (10), the second air inlet is connected to the top of the desulfurization tower (10) and a liquid pocket is provided at the lowest corner of the connecting pipeline, and the second air outlet is connected to the bottom of the chimney (12).

6. The energy-saving waste gas incineration system according to claim 5, wherein: A flue gas induced draft fan (9) is provided on the connecting pipeline between the first air outlet and the desulfurization tower (10).

7. The energy-saving waste gas incineration system according to claim 6, wherein: The desulfurization tower (10) is connected with a circulating spray assembly. The circulating spray assembly includes a circulating pump (11), a spray pipe and a spray head; a demister is arranged inside the upper part of the desulfurization tower (10).

8. The energy-saving waste gas incineration system according to claim 7, characterized in that: The circulating pump (11) is a centrifugal pump, and a basket filter is arranged at the inlet of the circulating pump (11).

9. The energy-saving waste gas incineration system according to claim 6, wherein: The outlet end of the flue gas induced draft fan (9) is also connected to the front end of the incinerator (6) through a reflux gas pipe.

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