Heat exchange system of incinerator and incinerator

Abstract

The application discloses a heat exchange system of an incinerator and the incinerator, and relates to the technical field of gasification combustion. The heat exchange system of the incinerator comprises an air preheater and a first heat exchange pipeline. The air preheater is provided with an air inlet, a heating air duct and an air outlet which are sequentially communicated. The first heat exchange pipeline comprises a first medium inlet, a first medium outlet, a first main heat absorption pipeline, a first auxiliary heat absorption pipeline and a first heat release pipeline. The first main heat absorption pipeline and the first auxiliary heat absorption pipeline are at least partially located in a heat exchange cavity of the incinerator, and the first heat release pipeline is at least partially located in the heating air duct. The first medium inlet, the first main heat absorption pipeline, the first heat release pipeline and the first medium outlet are sequentially communicated. The first heat exchange pipeline further comprises a first switch valve which is connected in parallel with the first auxiliary heat absorption pipeline. The heat exchange system of the incinerator can improve the temperature stability of the exhaust flue gas of the heat exchange cavity and improve the environmental protection performance of the incinerator.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gasification combustion, in particular to a heat exchange system of an incinerator and the incinerator. BACKGROUND

[0002] The incineration method for treating solid waste has been widely applied in the world due to its advantages of high efficiency, significant volume reduction, high energy utilization efficiency, etc. In the related art, the gasification incinerator is mainly used for incineration of domestic waste, industrial waste, sludge and hazardous waste. The flue gas generated after incineration needs to be purified and decontaminated before being discharged. However, the temperature of the flue gas is usually high, and the flue gas needs to be cooled before being purified and decontaminated. The exhaust gas temperature entering the final deacidification and dust removal system is usually 160-220℃, and the temperature value needs to be relatively stable to ensure the normal operation of the purification and decontamination system. If the exhaust gas temperature is unstable, it will have a great influence on the working efficiency and stability of the semi-dry method and wet method deacidification system, and in severe cases, the system may not work normally. In particular, the temperature of the bag-type dust removal equipment needs to be in a suitable range, and too high temperature will damage the cloth bag, and too low temperature will cause the cloth bag to condense, corrode and block.

[0003] For example, in the patent with the application number CN202210681582.9, a double-medium TFB gasification incinerator is disclosed, which uses heat-conducting oil and water as the main cooling medium, and sets water-cooled walls, heat-conducting oil coils, heat-conducting oil convection pipe rows, coal economizer pipes with water as the medium, and air preheaters in a cascade manner to realize full heat absorption and obtain maximum thermal efficiency. However, because the composition and calorific value of the domestic waste, industrial waste, sludge and hazardous waste entering the furnace will have a large range of fluctuations, combined with the change of the operating load, the exhaust gas temperature of the incinerator will have a large range of fluctuations, especially when the incinerator generates steam for industrial waste, the load of the user will change greatly, and the exhaust gas temperature will fluctuate greatly. Therefore, a special heat exchange system needs to be designed to overcome the fluctuations of the fuel composition, calorific value and operating load of the incinerator, and maintain the relative stability of the exhaust gas temperature. SUMMARY

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a heat exchange system of an incinerator, which can improve the temperature stability of the exhaust flue gas and improve the environmental protection performance of the incinerator.

[0005] The present application also proposes an incinerator with the above-mentioned heat exchange system.

[0006] The heat exchange system of the incinerator according to the embodiment of the present application comprises: an air preheater having an air inlet, a heating air duct and an air outlet connected in sequence; a first heat exchange pipeline comprising a first medium inlet, a first medium outlet, a first main heat absorption pipeline, a first auxiliary heat absorption pipeline and a first heat release pipeline, the first main heat absorption pipeline and the first auxiliary heat absorption pipeline being at least partially located in a heat exchange cavity of the incinerator, and the first heat release pipeline being at least partially located in the heating air duct; wherein the first medium inlet, the first main heat absorption pipeline, the first heat release pipeline and the first medium outlet are connected in sequence, and the first heat exchange pipeline further comprises a first switch valve connected in parallel with the first auxiliary heat absorption pipeline; the first switch valve is located between the first medium inlet and the first main heat absorption pipeline, or the first switch valve is located between the first main heat absorption pipeline and the first heat release pipeline.

[0007] The heat exchange system of the incinerator according to the embodiment of the present application can ensure the cooling effect of flue gas in the heat exchange cavity, because the first medium flows through the first main heat absorption pipeline and exchanges heat with the heat exchange cavity. The flow of the first medium flowing through the first auxiliary heat absorption pipeline to exchange heat with the heat exchange cavity can be adjusted by adjusting the switch valve, so that the heat exchange efficiency in the heat exchange cavity can be adjusted. The heat exchange efficiency of the first medium in the first heat exchange pipeline can be adjusted according to the temperature in the heat exchange cavity, so that the flue gas discharged from the heat exchange cavity can have a stable temperature. At the same time, the heat in the heat exchange cavity can be transmitted to the air preheater to heat the cold air, and the heat in the heat exchange cavity can also be used to heat the first medium itself, so that the utilization rate of the heat in the heat exchange cavity is improved, the energy is saved, and the environmental protection performance of the incinerator is improved.

[0008] In some embodiments, the first heat exchange pipeline further comprises a second switch valve connected in parallel with the first heat release pipeline.

[0009] In some embodiments, the heat exchange system further comprises: a second heat exchange pipeline comprising a second medium inlet, a second heat absorption pipeline, a second heat release pipeline and a second medium outlet connected in sequence, the second heat absorption pipeline being at least partially located in the heat exchange cavity of the incinerator, and the second heat release pipeline being at least partially located in the heating air duct.

[0010] Further, the first medium is water, and the second medium is steam; in the flue gas flow direction in the heat exchange cavity of the incinerator, the first main heat absorption pipeline and the first auxiliary heat absorption pipeline are located downstream of the second heat absorption pipeline; in the air flow direction in the heating air duct, the first heat release pipeline is located upstream of the second heat release pipeline.

[0011] In some embodiments, the second heat exchange pipeline further comprises a third switch valve, which is connected in parallel with the second heat releasing pipeline.

[0012] In some embodiments, the air preheater further comprises an adjustable baffle plate, which is arranged between the air inlet and the heating air duct to adjust the air volume entering the heating air duct.

[0013] Further, the air preheater further comprises a cold air duct, which is connected in parallel with the heating air duct, and has an air inlet end located between the air inlet and the adjustable baffle plate.

[0014] In some embodiments, the air preheater further comprises a driving fan, which drives the cold air to flow into the air inlet.

[0015] The incinerator according to the embodiments of the present application comprises the heat exchange system of the incinerator according to the embodiments described above.

[0016] The incinerator according to the embodiments of the present application, by adopting the heat exchange system according to the embodiments described above, the first medium flows through the first main heat absorbing pipeline and the heat exchange cavity to perform heat exchange, which can ensure the cooling effect of the flue gas in the heat exchange cavity. The first auxiliary heat exchange pipeline and the first switch valve are arranged in parallel, and by adjusting the switch valve, the flow of the first medium flowing through the first auxiliary heat absorbing pipeline to perform heat exchange with the heat exchange cavity can be adjusted, so as to adjust the heat exchange efficiency in the heat exchange cavity. The heat exchange efficiency of the first medium in the first heat exchange pipeline with the heat exchange cavity can be adjusted correspondingly according to the temperature in the heat exchange cavity, so that the flue gas in the heat exchange cavity can have a stable temperature when being discharged. At the same time, the heat in the heat exchange cavity can be transmitted to the air preheater to heat the cold air, and the heat in the heat exchange cavity can also be used to heat the first medium itself, so as to improve the utilization rate of the heat in the heat exchange cavity, save energy, and improve the environmental protection of the incinerator.

[0017] In some embodiments, the incinerator has a combustion cavity, and the air outlet is connected to the combustion cavity.

[0018] The main advantage of the present application is to overcome the shortcomings of the traditional heat exchange equipment, which is passively responsive to the heat exchange capacity when the incoming flue gas temperature and flue gas volume fluctuate, and the discharged flue gas temperature fluctuates greatly. The flow of heat exchange medium in different directions can be adjusted to control the final exhaust gas temperature to be stable, so as to fully realize the purpose that the rear end is basically unchanged regardless of the changes of the front end, and to balance the contradiction between high energy efficiency at high load and high emission at low load. Other additional aspects and advantages will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic diagram of a heat exchange system of an incinerator according to an embodiment of the present application;

[0020] Figure 2 is a structural schematic diagram of a heat exchange system of an incinerator according to another embodiment of the present application.

[0021] Reference signs:

[0022] the heat exchange system 100,

[0023] the air preheater 10, the air inlet 11, the heating air duct 12, the air outlet 13, the adjustable air baffle 14, the cold air duct 15,

[0024] the first heat exchange pipeline 20, the first medium inlet 21, the first auxiliary heat absorption pipeline 22, the first main heat absorption pipeline 23, the first heat release pipeline 24, the first medium outlet 25, the first switch valve 26, the second switch valve 27,

[0025] the second heat exchange pipeline 30, the second medium inlet 31, the second heat absorption pipeline 32, the second heat release pipeline 33, the second medium outlet 34, the third switch valve 35,

[0026] the heat exchange cavity 200. DETAILED DESCRIPTION

[0027] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein the same or like reference numerals and characters in the drawings and the following description denote the same or similar functions. The embodiments described below are merely exemplary for the purpose of explaining the present application and are not to be construed as limiting the present application.

[0028] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplification, the elements of the specific examples in the following description are described. Of course, they are merely examples and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to the same reference numerals and / or letters in different examples. Such repetition is for the purpose of simplification and clarity, and does not itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art can realize the applicability of other processes and / or the use of other materials.

[0029] The heat exchange system 100 of an incinerator and the incinerator according to embodiments of the present application are described below with reference to the attached drawings.

[0030] As Figure 1As shown, the heat exchange system 100 of the incinerator according to the embodiment of the present application comprises an air preheater 10 and a first heat exchange pipeline 20. The air preheater 10 has an air inlet 11, a heating air channel 12 and an air outlet 13 connected in sequence. The first heat exchange pipeline 20 comprises a first medium inlet 21, a first medium outlet 25, a first main heat absorption pipeline 23, a first auxiliary heat absorption pipeline 22 and a first heat release pipeline 24, the first main heat absorption pipeline 23 and the first auxiliary heat absorption pipeline 22 are at least partially located in a heat exchange cavity 200 of the incinerator, and the first heat release pipeline 24 is at least partially located in the heating air channel 12.

[0031] The first medium inlet 21, the first main heat absorption pipeline 23, the first heat release pipeline 24 and the first medium outlet 25 are connected in sequence, and the first heat exchange pipeline 20 further comprises a first switch valve 26 connected in parallel with the first auxiliary heat absorption pipeline 22. The first switch valve 26 is located between the first medium inlet 21 and the first main heat absorption pipeline 23, or the first switch valve 26 is located between the first main heat absorption pipeline 23 and the first heat release pipeline 24,

[0032] It can be understood that when the first medium flows from the first medium inlet 21 to the first main heat absorption pipeline 23 and the first auxiliary heat absorption pipeline 22, the first medium can exchange heat with the flue gas in the heat exchange cavity 200 in the first main heat absorption pipeline 23 and the first auxiliary heat absorption pipeline 22, so that the first medium can absorb the heat of the flue gas, thereby reducing the temperature of the flue gas and heating the first medium. The first medium heated in the first main heat absorption pipeline 23 and the first auxiliary heat absorption pipeline 22 flows into the first heat release pipeline 24, so that the first heat release pipeline 24 can exchange heat with the cold air in the heating channel, thereby heating the cold air, and the air preheater 10 outputs hot air at the air outlet 13. It can be seen that the first heat exchange pipeline 20 can reduce the temperature of the flue gas, increase the temperature of the first medium, and heat the cold air in the heating air channel 12, so that the air preheater 10 outputs hot air.

[0033] In addition, the first switch valve 26 can be used to adjust the flow of the first medium in the first auxiliary heat absorption pipeline 22. When the first switch valve 26 is closed, the first medium flows into the first auxiliary heat absorption pipeline 22, and all the first medium absorbs heat in the heat exchange cavity 200 in the first auxiliary heat absorption pipeline 22; when the first switch valve 26 is opened, the first medium is divided into the first auxiliary heat absorption pipeline 22 and the first switch valve 26, that is, part of the first medium flows into the first auxiliary heat absorption pipeline to absorb heat in the heat exchange cavity 200, and the other part flows through the first switch valve 26 without absorbing heat. That is, by adjusting the opening and closing degree of the first switch valve 26, the flow of the first medium that exchanges heat with the heat exchange cavity 200 in the first auxiliary heat absorption pipeline 22 can be controlled, and the heat absorption efficiency in the first heat exchange cavity 200 can be adjusted.

[0034] Thus, the first medium flows through the first main heat absorption pipeline 23 and the heat exchange cavity 200 to perform heat exchange, which can ensure the heat absorption effect of the first medium on the heat exchange cavity 200 and ensure the cooling effect of the flue gas in the heat exchange cavity 200. Meanwhile, the first auxiliary heat exchange pipeline and the first switch valve 26 are arranged in parallel, and the flow of the first medium flowing through the first auxiliary heat absorption pipeline 22 to perform heat exchange with the heat exchange cavity 200 can be adjusted by adjusting the first switch valve 26, so as to adjust the heat exchange efficiency in the heat exchange cavity 200.

[0035] Specifically, when the temperature in the heat exchange cavity 200 is relatively high, the opening degree of the valve of the first switch valve 26 is reduced, so that the first medium flowing into the first auxiliary heat absorption pipeline 22 is increased, and the heat absorption efficiency of the heat exchange cavity 200 can be improved; when the temperature in the heat exchange cavity 200 is relatively low, the opening degree of the valve of the first switch valve 26 is increased, so that the first medium flowing into the first auxiliary heat absorption pipeline 22 is reduced, and the heat absorption efficiency of the heat exchange cavity 200 can be reduced.

[0036] Thus, the heat absorption efficiency of the first medium in the first heat exchange pipeline 20 on the heat exchange cavity 200 can change with the temperature in the heat exchange cavity 200, and when the temperature in the heat exchange cavity 200 is increased, the heat absorption efficiency of the first medium in the first heat exchange pipeline 20 on the heat exchange cavity 200 is correspondingly increased; when the temperature in the heat exchange cavity 200 is decreased, the heat absorption efficiency of the first medium in the first heat exchange pipeline 20 on the heat exchange cavity 200 is correspondingly decreased. The flue gas discharged from the heat exchange cavity 200 can have a stable temperature, which is convenient for subsequent treatment of the flue gas and improves the stability of the flue gas treatment effect.

[0037] Meanwhile, the first medium can flow to the first heat release pipeline 24 after being heated in the first main heat absorption pipeline 23 and the first auxiliary heat absorption pipeline 22 in sequence, so as to transmit the heat in the heat exchange cavity 200 to the heating air duct 12 to heat the cold air, thereby improving the utilization rate of the heat in the heat exchange cavity 200. The air preheater 10 is arranged outside the heat exchange cavity 200, which can reduce or avoid the influence of the flue gas on the reliability of the air preheater 10.

[0038] In addition, when the first medium needs to be heated, the temperature of the flue gas in the heat exchange cavity 200 is relatively high, and the first medium can have a relatively high temperature after heat exchange in the heat exchange cavity 200. After the first medium flows out of the first heat exchange pipeline 20 from the first medium outlet 25, it still has a relatively high temperature, so that the first medium is also heated after flowing into the first heat exchange pipeline 20, thereby further improving the utilization rate of the heat in the heat exchange cavity 200, saving energy, and improving the environmental protection of the incinerator.

[0039] The heat exchange system 100 of the incinerator of the present application, the first medium flows through the first main heat absorption pipeline 23 and the heat exchange cavity 200 to perform heat exchange, which can ensure the cooling effect of the flue gas in the heat exchange cavity 200. The first auxiliary heat exchange pipeline and the first switch valve 26 are arranged in parallel, and the flow of the first medium flowing through the first auxiliary heat absorption pipeline 22 to perform heat exchange with the heat exchange cavity 200 can be adjusted by adjusting the switch valve, so as to adjust the heat exchange efficiency in the heat exchange cavity 200. The heat exchange efficiency of the first medium in the first heat exchange pipeline 20 to the heat exchange cavity 200 can be adjusted correspondingly according to the temperature in the heat exchange cavity 200, so that the flue gas in the heat exchange cavity 200 can have a stable temperature when it is discharged. At the same time, the heat in the heat exchange cavity 200 can be transmitted to the air preheater 10 to heat the cold air, and the heat in the heat exchange cavity 200 can also be used to heat the first medium itself, thereby improving the utilization rate of the heat in the heat exchange cavity 200, saving energy, and improving the environmental protection of the incinerator.

[0040] Preferably, the first switch valve 26 is an electromagnetic valve, and the size of the valve of the first switch valve 26 is adjustable between opening and closing.

[0041] In some embodiments, as shown in Figure 1 The first heat exchange pipeline 20 further comprises a second switch valve 27, which is connected in parallel with the first heat release pipeline 24. When the second switch valve 27 is closed, the first medium flows into the first heat release pipeline 24, and all the first medium heats the cold air in the heating air duct 12 in the first heat release pipeline 24; when the second switch valve 27 is opened, the first medium is divided into the first heat release pipeline 24 and the second switch valve 27, that is, part of the first medium flows into the first heat release pipeline 24, and the other part flows through the second switch valve 27 without flowing through the first heat release pipeline 24. That is, by adjusting the opening and closing degree of the second switch valve 27, the flow of the first medium in the first heat release pipeline 24 and the heating air duct 12 can be controlled, and the efficiency of the first medium flowing through the first heat release pipeline 24 to heat the cold air in the heating air duct 12 can be adjusted.

[0042] Therefore, by adjusting the second switch valve 27, when the valve of the second switch valve 27 is increased, the first medium flowing into the first heat release pipeline 24 can be reduced, and the heating effect of the cold air in the heating air duct 12 can be reduced; when the valve of the second switch valve 27 is reduced, the first medium flowing into the first heat release pipeline 24 can be increased, and the heating effect of the cold air in the heating air duct 12 can be improved. Thus, the heating effect of the cold air in the heating air duct 12 can be adjusted, and the flexibility of the air preheater 10 to heat the cold air can be improved.

[0043] In some embodiments, as shown in Figure 1As shown, the heat exchange system 100 further comprises a second heat exchange pipeline 30, the second heat exchange pipeline 30 comprising a second medium inlet 31, a second heat absorption pipeline 32, a second heat release pipeline 33 and a second medium outlet 34 connected in sequence, the second heat absorption pipeline 32 being at least partially located in the heat exchange cavity 200 of the incinerator, and the second heat release pipeline 33 being at least partially located in the heating air duct 12.

[0044] It can be understood that, when the second medium flows from the second medium inlet 31 to the second heat absorption pipeline 32, the second medium can exchange heat with the flue gas in the heat exchange cavity 200 in the second heat absorption pipeline 32, so that the second medium can absorb the heat of the flue gas and heat the second medium while reducing the temperature of the flue gas. The second medium heated in the second heat absorption pipeline 32 flows into the second heat release pipeline 33, so that the second heat release pipeline 33 can exchange heat with the cold air inlet in the heating channel, thereby heating the cold air, and the air preheater 10 outputs hot air at the air outlet 13. It can be seen that the second heat exchange pipeline 30 can reduce the temperature of the flue gas, while increasing the temperature of the second medium and heating the cold air in the heating air duct 12.

[0045] Therefore, by arranging the first heat exchange pipeline 20 and the second heat exchange pipeline 30, the first medium and the second medium can be heated at the same time, further improving the utilization rate of heat in the heat exchange cavity 200.

[0046] Further, the first medium is water, and the second medium is steam. It can be understood that the temperature of steam is higher than that of water, and the temperature of the heat exchange cavity 200 gradually decreases in the flow direction of the flue gas.

[0047] Therefore, in the heat exchange cavity 200 of the incinerator, the first main heat absorption pipeline 23 and the first auxiliary heat absorption pipeline 22 are located downstream of the second heat absorption pipeline 32 in the flow direction of the flue gas in the heat exchange cavity 200, so that the temperature of the heat exchange cavity 200 at the second heat absorption pipeline 32 is higher than that of the first main heat absorption pipeline 23 and the first auxiliary heat absorption pipeline, so that the steam with a higher temperature itself can be heated at a higher temperature in the heat exchange cavity 200, thereby ensuring the heating effect of the first medium and the second medium.

[0048] In this application, the first medium and the second medium are not limited to water and steam, as long as the temperature of the first medium is lower than that of the second medium. For example, the first medium is water, and the second medium is heat conducting oil.

[0049] Meanwhile, in the airflow direction in the heating air duct 12, the first heat release pipeline 24 is located upstream of the second heat release pipeline 33, and the temperature of the second medium is higher than that of the first medium, i.e. the temperature of the second heat release pipeline 33 is higher than that of the first heat release pipeline 24. Thus, the cold air is first heated by the first medium with a low temperature passing through the first heat release pipeline 24, and then heated by the second medium with a high temperature passing through the second heat release pipeline 33, which can ensure that the heat of the first medium is fully utilized and improve the heating effect on the cold air.

[0050] In some embodiments, as shown in Figure 2 the second heat exchange pipeline 30 further comprises a third switch valve 35 connected in parallel with the second heat release pipeline 33.

[0051] It can be understood that when the third switch valve 35 is closed, all the second medium flows into the second heat release pipeline 33, and all the second medium heats the cold air in the heating air duct 12 in the second heat release pipeline 33; when the third switch valve 35 is opened, the second medium is divided into two parts, one part flows into the second heat release pipeline 33, and the other part flows through the third switch valve 35 without flowing through the second heat release pipeline 33. That is, by adjusting the opening and closing degree of the third switch valve 35, the flow of the second medium in the second heat release pipeline 33 can be controlled, and the efficiency of the second medium flowing through the second heat release pipeline 33 to heat the cold air in the heating air duct 12 can be adjusted.

[0052] Thus, by adjusting the third switch valve 35, when the valve of the third switch valve 35 is increased, the second medium flowing into the second heat release pipeline 33 can be reduced, and the heating effect on the cold air in the heating air duct 12 can be reduced; when the valve of the third switch valve 35 is reduced, the second medium flowing into the second heat release pipeline 33 can be increased, and the heating effect on the cold air in the heating air duct 12 can be improved. Thus, the heating effect of the second heat exchange pipeline 30 on the cold air in the heating air duct 12 can be adjusted, and the flexibility of the air preheater 10 in heating the cold air can be further improved.

[0053] In some embodiments, as shown in Figure 1 , Figure 2 the air preheater 10 further comprises an adjustable baffle 14 arranged between the air inlet 11 and the heating air duct 12 to adjust the air volume entering the heating air duct 12. Thus, by adjusting the adjustable baffle 14, the air volume entering the heating air duct 12 can be adjusted, and in the case of different cold air volumes, the heating effect of the first medium on the cold air in the first heat release pipeline 24 is different, so as to realize the adjustment of the heating effect on the cold air and control the air volume and temperature of the airflow flowing out of the air preheater 10 through the air outlet 13.

[0054] Further, the air preheater 10 further comprises a cold air duct 15, the cold air duct 15 is connected with the heating air duct 12 in parallel, the cold air duct 15 has an air inlet end, the air inlet end is located between the air inlet 11 and the adjustable baffle 14.

[0055] It can be understood that the cold air entering the air preheater 10 from the air inlet 11 is divided into the cold air duct 15 and the heating air duct 12, and the amount of air entering the heating air duct 12 can be adjusted by adjusting the adjustable baffle 14. When the amount of air in the heating air duct 12 increases, the amount of air entering the cold air duct 15 decreases; when the amount of air in the heating air duct 12 decreases, the amount of air entering the cold air duct 15 increases.

[0056] Therefore, by adjusting the adjustable baffle 14, the proportion of the amount of air heated in the heating air duct 12 and the amount of air entering the cold air duct 15 can be correspondingly adjusted, so that the airflow in the cold air duct 15 and the airflow in the heating air duct 12 can have different temperatures after being merged, thereby adjusting the temperature of the air discharged from the air preheater 10 through the air outlet 13, and further improving the flexibility of the air preheater 10.

[0057] In some embodiments, the air preheater 10 further comprises a driving fan for driving the cold air to flow into the air inlet 11. Therefore, it can be ensured that the cold air can stably flow into the heating air duct 12 from the air inlet 11, thereby improving the stability of the air preheater 10 in heating the cold air and outputting the airflow at the air outlet 13.

[0058] The incinerator according to the embodiments of the present application comprises the heat exchange system 100 of the incinerator according to the above embodiments.

[0059] The incinerator according to the present application, by adopting the heat exchange system 100 according to the above embodiments, the first medium flows through the first main heat absorption pipeline 23 and exchanges heat in the heat exchange cavity 200, which can ensure the cooling effect of the flue gas in the heat exchange cavity 200. The first auxiliary heat exchange pipeline and the first switch valve 26 are arranged in parallel, and by adjusting the switch valve, the flow of the first medium flowing through the first auxiliary heat absorption pipeline 22 to exchange heat with the heat exchange cavity 200 can be adjusted, thereby adjusting the heat exchange efficiency in the heat exchange cavity 200. The heat exchange efficiency of the first medium in the first heat exchange pipeline 20 with the heat exchange cavity 200 can be correspondingly adjusted according to the temperature in the heat exchange cavity 200, thereby controlling the flue gas in the heat exchange cavity 200 to have a stable temperature when being discharged. At the same time, the heat in the heat exchange cavity 200 can be transmitted to the air preheater 10 to heat the cold air, and the heat in the heat exchange cavity 200 can also be used for heating the first medium itself, thereby improving the utilization rate of the heat in the heat exchange cavity 200, saving energy, and improving the environmental protection performance of the incinerator.

[0060] In some embodiments, the incinerator has a combustion chamber, and the air outlet 13 is communicated with the combustion chamber. Thus, the hot air heated by the air preheater 10 can be delivered to the combustion chamber for use as combustion air, and part of the heat can be circulated among the combustion chamber, the heat exchange chamber 200, the first heat exchange pipeline 20 and the air preheater 10, thereby further improving the heat utilization rate and the environmental protection performance of the incinerator.

[0061] The main advantage of the present application is that it overcomes the shortcomings of the conventional heat exchange equipment that the heat exchange capacity is passively responsive to the fluctuation of the incoming flue gas temperature and the flue gas volume, and the temperature of the discharged flue gas fluctuates greatly. The final discharged flue gas temperature can be controlled by adjusting the flow rates of the heat exchange medium in different directions, so as to achieve the purpose that the rear end is basically unchanged regardless of the changes of the front end, and the contradiction between high energy efficiency at high load and high emission at low load is considered.

[0062] The heat exchange system 100 of the incinerator and other configurations and operations of the incinerator according to the embodiments of the present application are known to those skilled in the art, and will not be described in detail here.

[0063] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0064] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0065] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection, or communication; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0066] In the present application, unless otherwise explicitly specified and limited, a first feature is "on" or "under" a second feature can mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature is "over", "above" and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. The first feature is "under", "below" and "underneath" the second feature can mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0067] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. The illustrative description of the above terms in the present specification does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0068] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A heat exchange system of an incinerator, characterized by, The application relates to an air preheater (10) having an air inlet (11), a heating air duct (12) and an air outlet (13) in sequence; a first heat exchange pipeline (20) comprising a first medium inlet (21), a first medium outlet (25), a first main heat absorption pipeline (23), a first auxiliary heat absorption pipeline (22) and a first heat release pipeline (24), wherein the first main heat absorption pipeline (23) and the first auxiliary heat absorption pipeline (22) are at least partially located in a heat exchange cavity (200) of the incinerator, and the first heat release pipeline (24) is at least partially located in the heating air duct (12); wherein the first medium inlet (21), the first main heat absorption pipeline (23), the first heat release pipeline (24) and the first medium outlet (25) are in sequence, and the first heat exchange pipeline (20) further comprises a first switch valve (26) connected in parallel with the first auxiliary heat absorption pipeline (22); the first switch valve (26) is located between the first medium inlet (21) and the first main heat absorption pipeline (23), or the first switch valve (26) is located between the first main heat absorption pipeline (23) and the first heat release pipeline (24). The first heat exchange pipeline (20) further comprises a second switch valve (27) connected in parallel with the first heat release pipeline (24). The application further relates to a second heat exchange pipeline (30) comprising a second medium inlet (31), a second heat absorption pipeline (32), a second heat release pipeline (33) and a second medium outlet (34) in sequence, wherein the second heat absorption pipeline (32) is at least partially located in the heat exchange cavity (200) of the incinerator, and the second heat release pipeline (33) is at least partially located in the heating air duct (12). The first medium is water, and the second medium is steam. In the smoke flow direction in the heat exchange cavity (200) of the incinerator, the first main heat absorption pipeline (23) and the first auxiliary heat absorption pipeline (22) are located downstream of the second heat absorption pipeline (32).

2. The heat exchange system of the incinerator according to claim 1, wherein In the air flow direction in the heating air duct (12), the first heat release pipeline (24) is located upstream of the second heat release pipeline (33).

3. The heat exchange system of the incinerator according to claim 1, wherein The second heat exchange pipeline (30) further comprises a third switch valve (35) connected in parallel with the second heat release pipeline (33). The air preheater (10) further comprises an adjustable baffle (14) arranged between the air inlet (11) and the heating air duct (12) to adjust the air volume entering the heating air duct (12).

4. The heat exchange system of the incinerator according to claim 3, wherein The air preheater (10) further comprises a cold air duct (15) connected in parallel with the heating air duct (12), wherein the cold air duct (15) has an air inlet end located between the air inlet (11) and the adjustable baffle (14). ​ ​ 5. The heat exchange system of the incinerator according to claim 3, wherein ​ 6. The heat exchange system of an incinerator according to any one of claims 1 to 5, wherein ​ 7. The heat exchange system of the incinerator according to claim 6, wherein ​ 8. The heat exchange system of the incinerator according to any one of claims 1 to 5, wherein The air preheater (10) further comprises a driving fan driving cold air to flow into the air inlet (11).

9. An incinerator, characterized by The heat exchange system (100) comprising the incinerator as claimed in any one of claims 1-8.

10. An incinerator according to claim 9, characterised in that The incinerator has a combustion cavity, and the air outlet (13) communicates with the combustion cavity.

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