Saving type three-section incinerator and incineration method thereof

Abstract

The invention relates to the technical field of waste gas and waste liquid incinerators, in particular to a saving type three-section incinerator and an incineration method thereof. The incinerator system comprises an oxidation zone, a cooling zone and a reoxidation zone. Wherein the oxidation zone is provided with a combined combustor and a waste liquid spray gun and is used for treating high-concentration waste gas and waste liquid; a tube bundle type heat exchange device is adopted in the cooling area to recover waste heat of waste gas, and generated steam can be used for process recycling; and the reoxidation zone prolongs the residence time of the waste gas through the structural design, and is provided with a low-concentration waste gas independent inlet. A high-concentration and low-concentration waste gas quality-divided treatment mode is adopted, heat energy gradient utilization is achieved through a switchable heat exchange path, efficient removal of pollutants is guaranteed, and system energy consumption is remarkably reduced. The integrated design solves the problems of complex system, high cost, overlarge energy consumption and the like of traditional multiple sets of incineration equipment, and has the advantages of high treatment efficiency, good energy utilization rate, low operation cost and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waste gas and waste liquid incinerator, in particular to a saving type three-stage incinerator and an incineration method thereof. BACKGROUND

[0002] The traditional three-stage incinerator has been applied in the field of waste gas treatment, especially in the treatment of process waste gas in the carbon fiber industry. Its typical treatment process is as follows: the first stage is the oxidation zone, the temperature is usually set at 1200℃, all combustible materials are oxidized in the oxygen-deficient environment to generate carbon monoxide and hydrogen; the second stage is the cooling zone, the temperature is about 882℃, water or steam is directly sprayed to reduce the temperature of the waste gas; the third stage is the re-oxidation zone, the temperature is maintained at 910℃, carbon monoxide and hydrogen are further oxidized to generate carbon dioxide and water. In actual application, when facing two different concentrations of waste gas, the traditional process usually adopts the simultaneous gas inlet mode of mixing the two waste gases and treating them uniformly. This treatment method is difficult to accurately control according to the characteristics of waste gas of different concentrations, often leading to insufficient treatment of high-concentration waste gas or excessive treatment of low-concentration waste gas, causing energy waste. In order to ensure that the high-concentration waste gas reaches a removal efficiency of 99.99% or above, two sets of incinerators in series are used, and the low-concentration waste gas still needs to be configured with an independent treatment system. The whole process requires three sets of incineration equipment to meet the requirements.

[0003] This multi-device solution has the following defects: the configuration of three sets of incinerators greatly increases the initial investment cost of the equipment, and also requires a larger installation site, which constitutes an implementation obstacle for enterprises with limited space or budget. The parallel or series operation of multiple systems sharply increases the complexity of the whole waste gas treatment system, and the number of fault points increases accordingly, the workload and difficulty of daily maintenance and repair increase, and the dependence on professional personnel also increases the human cost in operation. In addition, the low-concentration waste gas system needs to consume a large amount of fuel to maintain the reaction temperature, resulting in high operating costs. At the same time, the water or steam direct cooling method used in the cooling zone only simply removes the waste gas heat, and does not effectively recover and utilize the large amount of heat energy contained therein, causing energy waste. Finally, the traditional three-stage incinerator has a single function, its design is mainly aimed at waste gas treatment, and it cannot effectively treat waste liquid generated simultaneously in the production process. This makes it have poor adaptability when facing complex process conditions of both waste gas and waste liquid, limiting its application range. Therefore, it is urgent to develop an integrated incinerator system that can realize the separate treatment of high and low concentration waste gas and efficiently recover heat energy. SUMMARY

[0004] In order to solve the above technical problems, the present scheme adopts an independent gas inlet mode, high-concentration waste gas and waste liquid are introduced into an oxidation zone for treatment, intermediate gas enters a second-stage tube bundle for cooling and heat recovery; low-concentration waste gas enters a third stage through an independent inlet, is mixed with the cooled gas and is oxidized again, so that integrated efficient treatment and heat recovery are realized.

[0005] In order to achieve the above purposes, the present application specifically adopts the following scheme: A saving three-stage incineration method, comprising the following steps: High-concentration waste gas and waste liquid are introduced into an oxidation zone, and an oxidation reaction is carried out in an under-oxygen environment at a first temperature to generate intermediate gas containing carbon monoxide and hydrogen; The intermediate gas is introduced into a cooling zone, is cooled by heat absorption through a tube bundle arranged in the cooling zone, and the recovered heat is used to generate steam or preheat low-concentration waste gas through a heat exchanger; The cooled intermediate gas is mixed with low-concentration waste gas in a re-oxidation zone, and a re-oxidation reaction is carried out at a second temperature; Wherein, the gas is input through a ventilation opening of a partition wall between the zones; the low-concentration waste gas is transported through an independent low-concentration waste gas inlet, and can be selectively preheated by flowing through the heat exchanger or directly transported to the re-oxidation zone through a heat exchanger bypass pipeline.

[0006] Preferably, the first temperature is 1150 DEG C, and the second temperature is 910 DEG C.

[0007] Further, the waste liquid is atomized by a multi-layer microporous plate superposition structure or an atomizing spray gun before being introduced into the oxidation zone; in the oxidation zone, a dynamic air flow disturbance device composed of an angle-adjustable deflector is used to enhance the mixing of waste gas and / or waste liquid.

[0008] Further, in the cooling zone, the water flow in the tube bundle is adjusted based on the feedback of a temperature gradient monitoring system, and the waste gas flow is controlled by an adjustable louver; a temperature sensor is arranged at the outlet of the cooling zone, and the waste gas enters the re-oxidation zone after the temperature is reduced to a suitable range.

[0009] Further, in the re-oxidation zone, a folding wave plate is used to prolong the residence time of the waste gas to a certain time, and a catalyst is optionally used to promote the reaction.

[0010] Further, the cooling water in the tube bundle is input through a boiler feed water pipeline, and the steam generated after heat absorption is output through an evaporation steam pipeline; Valves are arranged on the low-concentration waste gas input pipeline and the heat side pipeline of the heat exchanger, so that the flow path of the low-concentration waste gas can be switched: when the high-temperature waste gas heat is sufficient, the valves control the low-concentration waste gas to directly enter the re-oxidation zone through the bypass pipeline of the heat exchanger, and mix with the intermediate gas from the cooling zone; When the high-temperature waste gas heat is insufficient, the valves control the low-concentration waste gas to flow through the second low-concentration waste gas pipeline, the steam is transported to the heat exchanger through the heat side pipeline of the heat exchanger, the low-concentration waste gas in the second low-concentration waste gas pipeline is preheated by absorbing heat from the metal wall of the heat exchanger, and then enters the re-oxidation zone to mix with the intermediate gas, and the exchanged steam is output through the cold side pipeline of the heat exchanger.

[0011] Correspondingly, the application also provides a saving three-stage incinerator for implementing the method, comprising: a furnace body, which is internally provided with an oxidation zone, a cooling zone and a re-oxidation zone in sequence; the cooling zone is separated from the oxidation zone and the re-oxidation zone by a partition wall; a combined burner, which is installed at the top of the oxidation zone and used for introducing high-concentration waste gas; a waste liquid spray gun, which is arranged in the oxidation zone and used for introducing waste liquid; a tube bundle, which is arranged in the cooling zone and has two ends connected with a boiler feed water pipeline and a vaporization steam pipeline respectively; a heat exchanger, which is communicated with the cooling zone through a heat side pipeline of the heat exchanger; a low-concentration waste gas conveying system, comprising: a second low-concentration waste gas pipeline, which is communicated with the cold side inlet of the heat exchanger; a heat exchanger cold side pipeline, which is communicated with the cold side outlet of the heat exchanger; a heat exchanger bypass pipeline, which bypasses the heat exchanger; an independent low-concentration waste gas inlet, which is communicated with the re-oxidation zone; Valves are arranged on the low-concentration waste gas input pipeline and the heat exchanger bypass pipeline, and used for switching the flow path of the low-concentration waste gas.

[0012] Further, the waste liquid spray gun is provided with an atomization structure, which is a multi-layer microporous plate superposition structure or an atomizing spray gun; a dynamic airflow disturbance device is arranged in the oxidation zone and the re-oxidation zone, and the device comprises a plurality of adjustable angle guide plates.

[0013] Further, a temperature gradient monitoring system is arranged in the cooling zone, and used for monitoring the temperature distribution along the length direction of the tube bundle.

[0014] Further, a folded wave plate structure for prolonging the residence time of waste gas is arranged in the re-oxidation zone; the composite baffle structure is composed of a plurality of folded wave plates and cyclone blades with different angles and spacings; a catalyst is arranged in the re-oxidation zone.

[0015] Further, a louver device is installed on the second ventilation opening of the second partition wall, and an electric actuator controls the opening degree of the louver to adjust the flow rate of the exhaust gas flowing into the second ventilation opening; wherein a temperature sensor is installed at the outlet of the cooling zone, and when the temperature of the exhaust gas is reduced to a suitable range, the louver device at the outlet is opened to allow the exhaust gas cooled in the cooling zone to enter the re-oxidation zone.

[0016] Compared with the prior art, the present application has the following beneficial technical effects: The present application realizes the separate and hierarchical treatment of exhaust gas by adopting independent gas inlet mode, and high and low concentration exhaust gas is respectively introduced into different treatment zones. High concentration exhaust gas is fully oxidized in the oxidation zone, and low concentration exhaust gas participates in the terminal reaction in the re-oxidation zone. This design avoids the problem of low treatment efficiency caused by the traditional mixed gas inlet mode, and can accurately control the characteristics of exhaust gas of different concentrations, thereby improving the overall removal efficiency of pollutants.

[0017] The cooling zone adopts a tube bundle heat absorption mode to effectively recover the waste heat in the exhaust gas and convert it into steam energy. At the same time, part of the heat is used to preheat low concentration exhaust gas through the heat exchanger device. This heat energy cascade utilization method greatly reduces the dependence on external fuel of the system, especially reduces the energy consumption required for heating low concentration exhaust gas, and realizes the reduction of operation cost.

[0018] The work that needs three sets of incinerators in the traditional process is integrated into one set of equipment. The integrated design not only greatly reduces the equipment procurement cost and reduces the occupied area, but also simplifies the system structure and reduces the operation and maintenance complexity, so that the reliability and maintainability of the whole system are obviously improved. The temperature and pressure sensors and airflow adjusting devices arranged in each treatment zone realize accurate control of the treatment process. The dynamic airflow disturbance device ensures the sufficient mixing of reactants, the temperature gradient monitoring system optimizes the heat recovery efficiency, and the adjustable louver precisely controls the gas flow, and the cooperative operation ensures the stability of the system operation. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic diagram of a specific embodiment of the present application.

[0020] Numbering in the figure: 1, combined burner; 2, oxidation zone; 3, guide plate; 4, waste liquid lance; 5, atomizing lance; 6, tube bundle; 7, catalyst; 8, folded wave plate; 9, evaporation vapor pipeline; 10, boiler feedwater pipeline; 11, heat exchanger hot side pipeline; 12, manhole; 13, heat exchanger cold side pipeline; 14, heat exchanger; 15, heat exchanger bypass pipeline (first low-concentration waste gas pipeline); 16, second low-concentration waste gas pipeline; 17, sight glass; 18, low-concentration waste gas inlet; 19, cooling zone; 20, re-oxidation zone; 21, temperature sensor; 22, pressure sensor; 23, partition wall; 23a, first partition wall; 23b, second partition wall; 24, cyclone blade. DETAILED DESCRIPTION

[0021] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0023] Embodiment 1 Please refer to Figure 1 The present embodiment provides a saving type three-stage incinerator, which has a furnace body made of carbon steel, and an oxidation zone 2, a cooling zone 19 and a re-oxidation zone 20 arranged in sequence inside. The inner wall of the furnace body is lined with a refractory brick layer, a castable layer and a thermal insulation cotton layer for heat preservation. A combined burner 1 is installed at the top of the oxidation zone 2. A waste liquid lance 4 is arranged in the oxidation zone 2, and the head thereof is provided with an atomizing structure with multiple layers of microporous plates stacked. The oxidation zone 2 is further provided with a dynamic air flow disturbance device composed of multiple adjustable angle guide plates 3, a temperature sensor 21 and a pressure sensor 22. The zones are separated by a partition wall 23 made of refractory bricks, and the second partition wall 23b is provided with a second ventilation opening, and an adjustable opening louver is installed at the second ventilation opening.

[0024] A plurality of high-temperature-resistant stainless steel tubes 6 are uniformly arranged in the cooling zone 19, forming the main heat recovery unit. The two ends of the tube bundle 6 are connected to the boiler feed water pipe 10 and the evaporation steam pipe 9 respectively, forming a complete heat recovery loop, which can effectively convert the waste heat in the exhaust gas into steam energy. A temperature gradient monitoring system is also provided inside the cooling zone 19 to monitor the temperature changes at different positions of the tube bundle in real time. A sight glass 17 is provided on the outside of the cooling zone 19 for observing the inside of the cooling zone 19. The hot side of the heat exchanger 14 is connected to the high-temperature exhaust gas source of the cooling zone 19 through the heat exchanger hot side pipe 11, establishing a heat transfer path. Further, a temperature sensor is installed at the outlet of the cooling zone 19. When the exhaust gas temperature is reduced to the set range, the shutter is opened by the electric actuator to ensure that the exhaust gas at the appropriate temperature enters the next processing stage.

[0025] The volume of the re-oxidation zone 20 is designed to be enlarged, and is provided with a multi-stage composite baffling structure inside. The structure is composed of multiple layers of folding wave plates 8 with different angles and spacings, and cyclone blades 24 for enhancing mixing effect. The area is equipped with catalyst 7 to promote the efficiency of oxidation reaction, and is also provided with temperature sensor 21 and pressure sensor 22 for real-time monitoring and ensuring that the reaction conditions are within the effective range. The low-concentration exhaust gas delivery system includes a second low-concentration exhaust gas pipeline 16 connected to the inlet of the cold side of the heat exchanger 14, a heat exchanger cold side pipe 13 connected to the outlet of the cold side of the heat exchanger, a heat exchanger bypass pipeline 15 bypassing the heat exchanger, and a low-concentration exhaust gas inlet 18 connected to the re-oxidation zone 20. Control valves are provided on the low-concentration exhaust gas delivery pipeline and the heat exchanger hot side pipe for flexible switching of the low-concentration exhaust gas flow path. The low-concentration exhaust gas is directly introduced into the re-oxidation zone from the independent low-concentration exhaust gas inlet 18, and the cooled high-temperature exhaust gas and the low-concentration exhaust gas are fully mixed and re-oxidized in the re-oxidation zone.

[0026] In use, start the combined burner 1, heat the oxidation zone 2 to 1150℃. The high-concentration exhaust gas and waste liquid are introduced through the combined burner 1, the waste liquid is uniformly atomized by the multi-layered micro-porous plate atomizing structure, and then undergoes oxidation reaction under the action of the dynamic airflow disturbance device, with a residence time of 2-2.5 seconds, generating intermediate gas. The oxidized exhaust gas enters the cooling zone 19, and the opening degree of the shutter and the water flow in the tube bundle 6 are adjusted according to the feedback of the temperature gradient monitoring system. The absorbed heat is used to generate steam.

[0027] When the high-temperature exhaust gas heat is sufficient, the low-concentration exhaust gas directly enters the re-oxidation zone 20 through the heat exchanger bypass pipeline 15.

[0028] When the system detects that the high-temperature exhaust gas heat is insufficient, the low-concentration exhaust gas treatment path and heat recovery process are as follows: The boiler feed water is pumped into the tube bundle 6 of the cooling zone 19 through the boiler feed water pipeline 10, and is converted into steam after absorbing the heat of the high-temperature intermediate gas, and the steam is led out through the evaporation steam pipeline 9. At the same time, a part of the heat fluid for heating is introduced into the hot side of the heat exchanger 14 through the heat exchanger hot side pipeline 11.

[0029] The low-concentration exhaust gas is transported to the cold side inlet of the heat exchanger 14 through the second low-concentration exhaust gas pipeline 16. Inside the heat exchanger 14, the heat fluid transfers heat to the low-concentration exhaust gas through the tube wall, so that the temperature of the low-concentration exhaust gas is significantly increased. The preheated low-concentration exhaust gas then enters the reoxidation zone 20 from the independent low-concentration exhaust gas inlet 18.

[0030] In this process, the intermediate gas flowing out from the cooling zone 19 and having been cooled also synchronously enters the reoxidation zone 20. The preheated low-concentration exhaust gas and the cooled intermediate gas are fully mixed in this area. The mixed gas is guided by the multi-stage composite baffle structure composed of the folded wave plate 8 and the like in the enlarged-volume reoxidation zone 20, the flow path is lengthened, and the residence time is ensured. Under the catalysis of the catalyst 7, the mixed gas undergoes high-efficiency reoxidation reaction at a temperature of about 910°C, and finally the carbon monoxide and hydrogen are completely converted into carbon dioxide and water, ensuring efficient removal of pollutants.

[0031] Embodiment 2 Please refer to Figure 1 , the structure of this embodiment is basically the same as that of embodiment 1, the difference is that the waste liquid lance 4 of the oxidation zone 2 adopts an ultrasonic atomization structure, i.e. an atomizing lance 5, instead of a multi-layer microporous plate stacking structure. The reoxidation zone 20 adopts a spiral coil structure instead of a multi-stage composite baffle structure. The remaining components and their connection relationships are consistent with those of embodiment 1.

[0032] In use, start the combined burner 1, heat the temperature of the oxidation zone 2 to 1150°C. The high-concentration exhaust gas and the waste liquid are introduced through the combined burner 1, the waste liquid is uniformly atomized by the atomizing lance 5, and then undergoes oxidation reaction under the action of the dynamic airflow disturbance device. The oxidized exhaust gas enters the cooling zone 19 for heat recovery, and the operation method is the same as that of embodiment 1. The cooled exhaust gas is mixed with the low-concentration exhaust gas in the reoxidation zone 20, and the exhaust gas flows along the spiral coil to lengthen the residence time and undergoes reoxidation reaction under the action of the catalyst 7.

[0033] If the ultrasonic atomization structure in this embodiment fails, it can be replaced by the multi-layer microporous plate stacking structure in embodiment 1. The maintenance opening 12 is provided on the side of the reoxidation zone 20, and if the spiral coil structure fails, the maintenance worker can enter to replace the multi-stage composite baffle structure in embodiment 1.

[0034] Removal verification experiment To verify the treatment effect of the present application, the following experiment was conducted: start the incinerator as described in Example 1 or 2, heat the oxidation zone 2 temperature to 1150℃ and run stably. Use the waste gas generator to generate high concentration and low concentration waste gas respectively, the high concentration waste gas is introduced into the oxidation zone 2 through the combined burner 1, and the low concentration waste gas is introduced into the re-oxidation zone 20 from the independent low concentration waste gas inlet 18. Use the waste gas analyzer to sample at the inlet and outlet of the re-oxidation zone 20, and analyze the concentration of pollutants in the waste gas. At the same time, use temperature sensor and pressure sensor to monitor the temperature and pressure in the re-oxidation zone. Continuous sampling and analysis were carried out, and the data were recorded.

[0035] The experimental results show that: at the inlet of the re-oxidation zone 20, the average concentration of pollutants in the waste gas is 400 mg / Nm³, and at the outlet, it is reduced to below 0.4 mg / m³, and the single zone removal efficiency is calculated to be more than 99.9%. That is, without the three sets of incineration equipment, after the overall system of the present application is treated, the concentration of pollutants in the waste gas is reduced to a very low level, and the overall removal efficiency is more than 99.999%.

Claims

1. A method of incineration in a three-stage, economy-type incinerator, characterized in that, The method comprises the following steps: high-concentration waste gas and waste liquid are introduced into an oxidation zone (2) to perform an oxidation reaction under an oxygen-deficient environment at a first temperature, to generate intermediate gas containing carbon monoxide and hydrogen; the intermediate gas is introduced into a cooling zone (19) to perform endothermic cooling through a pipe bundle (6) arranged in the cooling zone, and the recovered heat is used to generate steam or preheat low-concentration waste gas through a heat exchanger (14); the cooled intermediate gas is mixed with low-concentration waste gas in a re-oxidation zone (20) to perform a re-oxidation reaction at a second temperature; wherein, the gas is introduced between the zones through a ventilation opening of a partition wall (23); the low-concentration waste gas is transported through a separate low-concentration waste gas inlet (18) and can be selectively preheated by flowing through the heat exchanger (14) or directly transported to the re-oxidation zone (20) through a heat exchanger bypass pipeline (15).

2. The method of incineration of claim 1, wherein, Before being introduced into the oxidation zone (2), the waste liquid is atomized by a multi-layer microporous plate superposition structure or an atomizing lance (5) through a waste liquid lance (4); in the oxidation zone (2), the mixing of the waste gas and / or the waste liquid is enhanced by a dynamic air flow disturbance device composed of adjustable angle guide plates (3).

3. The method of incineration of claim 1, wherein, In the cooling zone (19), the water flow in the pipe bundle (6) is adjusted based on the feedback of a temperature gradient monitoring system, and the waste gas flow is controlled by adjustable louvers; a temperature sensor (21) is arranged at the outlet of the cooling zone (19), and the waste gas enters the re-oxidation zone (20) after the temperature is reduced to a suitable range.

4. The method of incineration of claim 1, wherein, In the re-oxidation zone (20), the residence time of the waste gas is extended to a certain time by folding wave plates (8), and a catalyst (7) is optionally used to promote the reaction.

5. The method for saving three-stage incineration of the incinerator according to claim 1, characterized in that, the cooling water in the pipe bundle (6) is input through a boiler feed water pipeline (10), and the steam generated after heat absorption is output through an evaporation steam pipeline (9); valves are arranged on the low-concentration waste gas input pipeline and the heat side pipeline (11) of the heat exchanger, so that the flow path of the low-concentration waste gas can be switched: when the high-temperature waste gas heat is sufficient, the valve controls the low-concentration waste gas to directly enter the re-oxidation zone (20) through the heat exchanger bypass pipeline (15) and mix with the intermediate gas from the cooling zone; when the high-temperature waste gas heat is insufficient, the valve controls the low-concentration waste gas to flow through the second low-concentration waste gas pipeline (16), the steam is transported to the heat exchanger (14) through the heat side pipeline (11) of the heat exchanger, the low-concentration waste gas in the second low-concentration waste gas pipeline (16) is preheated by absorbing heat from the metal wall of the heat exchanger (14), and then enters the re-oxidation zone (20) to mix with the intermediate gas; the steam after heat exchange is output through the cold side pipeline (13) of the heat exchanger.

6. A conservation three-stage incinerator for carrying out the method according to any one of claims 1 to 5, characterized in that The method comprises: a furnace body, inside which are sequentially arranged an oxidation zone (2), a cooling zone (19) and a re-oxidation zone (20); the cooling zone (19) is separated from the oxidation zone (2) and the re-oxidation zone (20) by a partition wall (23); a combined burner (1) installed at the top of the oxidation zone (2) for introducing high-concentration waste gas; A waste liquid injection lance (4) is arranged in the oxidation zone (2) for introducing waste liquid; A tube bundle (6) is arranged in the cooling zone (19) and connected to a boiler feed water pipe (10) and a steam pipe (9) at two ends thereof; A heat exchanger (14) has a hot side connected to the cooling zone (19) through a heat exchanger hot side pipe (11); A low-concentration waste gas delivery system comprises: A second low-concentration waste gas pipe (16) connected to an inlet of a cold side of the heat exchanger (14); A heat exchanger cold side pipe (13) connected to an outlet of the cold side of the heat exchanger (14); A heat exchanger bypass pipe (15) bypassing the heat exchanger (14); A low-concentration waste gas inlet (18) connected to the re-oxidation zone (20); Valves are arranged on the low-concentration waste gas input pipe and the heat exchanger bypass pipe (15) for switching the flow path of the low-concentration waste gas.

7. The economy three-stage incinerator of claim 6 wherein, The waste liquid injection lance (4) is provided with an atomization structure, which is a multi-layer microporous plate superposition structure or an atomizing lance (5); a dynamic airflow disturbance device is arranged in the oxidation zone (2) and the re-oxidation zone (20), and the device comprises a plurality of adjustable angle guide plates (3).

8. The economy three-stage incinerator of claim 6 wherein, A temperature gradient monitoring system is arranged in the cooling zone (19) and comprises a plurality of temperature sensors (21) distributed along the length direction of the tube bundle (6) for monitoring the temperature distribution along the length direction of the tube bundle (6).

9. The economy three-stage incinerator of claim 6 wherein, A folding wave plate (8) for prolonging the residence time of waste gas is arranged in the re-oxidation zone (20); the folding wave plate (8) and a cyclone vane (24) form a composite baffle structure with multiple layers, different angles and spacings; a catalyst (7) is arranged in the re-oxidation zone (20).

10. The economy three-stage incinerator of claim 6 wherein, A louver device is mounted on a second air vent of a second partition wall (23b), and an electric actuator controls the opening of the louver to adjust the flow rate entering the second air vent; a temperature sensor is mounted at the outlet of the cooling zone (19), and when the temperature of the waste gas decreases to a suitable range, the louver device at the outlet is opened to allow the waste gas cooled in the cooling zone (19) to enter the re-oxidation zone (20).

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