Regenerative combustion system

Abstract

The utility model relates to a heat accumulating type combustion system. The heat accumulating type combustion system comprises a heating furnace, a fuel conveying pipeline, a combustion improver conveying pipeline and a flue gas conveying pipeline, the heating furnace is provided with a plurality of nozzles, each nozzle is provided with a heat accumulator, and the heat accumulators are used for storing heat of flue gas sprayed out of the corresponding nozzles; when the temperature of flue gas sprayed out of the corresponding nozzle is lower than the preset temperature after heat storage of the corresponding heat storage body, the flue gas conveying pipeline conveys the flue gas after heat storage to other nozzles, the fuel conveying pipeline conveys fuel to other nozzles, the combustion improver conveying pipeline conveys combustion improver to other nozzles, and the combustion improver conveying pipeline conveys the combustion improver to other nozzles. And other nozzles spray the flue gas after heat storage, the fuel and the combustion improver into the heating furnace. According to the heat accumulating type combustion system, smoke sprayed out of the nozzle of the heating furnace can flow back into the heating furnace through the smoke conveying pipeline after being subjected to heat accumulation through the heat accumulator, the flame temperature in the heating furnace is reduced, energy-saving combustion of the combustion system is achieved under the most economical air-fuel ratio, and energy waste is avoided.

Description

Technical Field

[0001] The present application relates to the field of energy-saving technology, and in particular to a heat storage combustion system. Background Art

[0002] At present, the regenerative combustion method is widely used in the field of industrial heating furnaces, achieving efficient and energy-saving combustion by reducing the exhaust temperature. However, in the fields of forging billet preheating and industrial raw material drying, the flame temperature is required not to exceed the specified temperature (for example, the flame temperature is required not to be higher than 1100°C). Therefore, in order to achieve the established flame temperature, the heating furnaces in this field currently use a large air-fuel ratio (air / fuel flow ratio) combustion method, such as air and natural gas combustion, whose theoretical optimal economic working volume flow ratio is 9.82 (its flame temperature is 1950°C), but in order to control the flame temperature, for example, the air-fuel ratio of a heating furnace combustion system must be set at 50, which is far from the theoretical optimal air-fuel ratio, resulting in energy waste. Summary of the invention

[0003] Based on this, it is necessary to provide a heat storage combustion system to address the above technical problems.

[0004] A regenerative combustion system, comprising: a heating furnace, a fuel delivery pipeline, an oxidant delivery pipeline and a flue gas delivery pipeline, wherein the heating furnace is provided with a plurality of nozzles, wherein each nozzle is provided with a regenerative body, and the regenerative body is used to store the heat of the flue gas ejected by the corresponding nozzle;

[0005] When the temperature of the flue gas ejected from the corresponding nozzle after heat storage in the corresponding heat storage body is lower than the preset temperature, the flue gas delivery pipeline delivers the heat-stored flue gas to the remaining nozzles, the fuel delivery pipeline delivers the fuel to the remaining nozzles, and the combustion aid delivery pipeline delivers the combustion aid to the remaining nozzles, and the remaining nozzles spray the heat-stored flue gas, the fuel and the combustion aid into the heating furnace.

[0006] In one embodiment, the plurality of nozzles include a first nozzle and a second nozzle, the first nozzle is provided with a first heat storage body, and the second nozzle is provided with a second heat storage body;

[0007] When the temperature of the flue gas ejected from the first nozzle after heat storage is less than or equal to the preset temperature, or the temperature of the flue gas ejected from the second nozzle after heat storage is greater than the preset temperature, the fuel delivery pipeline and the combustion-supporting agent delivery pipeline are both connected to the second nozzle, the inlet of the flue gas delivery pipeline is connected to the first heat storage body, and the outlet is connected to the second nozzle;

[0008] When the temperature of the flue gas ejected from the first nozzle after heat storage is greater than the preset temperature, or the temperature of the flue gas ejected from the second nozzle after heat storage is less than or equal to the preset temperature, the fuel delivery pipeline and the combustion aid delivery pipeline are both connected to the first nozzle, the inlet of the flue gas delivery pipeline is connected to the second heat storage body, and the outlet is connected to the first nozzle.

[0009] In one embodiment, the first heat storage body is connected and communicated with a first main pipeline, the second heat storage body is connected and communicated with a second main pipeline, the first main pipeline and the second main pipeline are connected through a reversing valve, and the reversing valve is also connected to the outlet of the combustion-supporting agent delivery pipeline and has a first working state and a second working state;

[0010] The smoke delivery pipeline includes a first branch pipeline, a second branch pipeline and a third branch pipeline, the inlet of the first branch pipeline is connected to the reversing valve, and the outlet is respectively connected to and communicated with the inlet of the second branch pipeline and the inlet of the third branch pipeline, the outlet of the second branch pipeline is connected to and communicated with the first main pipeline, and the outlet of the third branch pipeline is connected to and communicated with the second main pipeline;

[0011] When the reversing valve is in the first working state, the combustion aid delivery pipeline is connected to the second main pipeline, and the inlet of the first branch pipeline is connected to the first main pipeline; and when the reversing valve is in the second working state, the combustion aid delivery pipeline is connected to the first main pipeline, and the inlet of the first branch pipeline is connected to the second main pipeline.

[0012] In one embodiment, the regenerative combustion system further includes a first temperature sensor, a second temperature sensor, and a control module conductively connected to the first temperature sensor, the second temperature sensor, and the reversing valve;

[0013] The first temperature sensor is used to monitor the temperature of the flue gas ejected from the first nozzle after heat storage;

[0014] The second temperature sensor is used to monitor the temperature of the flue gas ejected from the second nozzle after heat storage;

[0015] The control module is used to control the reversing valve to switch between the first working state and the second working state based on the temperature of the flue gas ejected from the first nozzle after heat storage or the temperature of the flue gas ejected from the second nozzle after heat storage.

[0016] In one embodiment, the first branch pipeline is connected with the second branch pipeline and the third branch pipeline through a first tee piece; and / or,

[0017] The second branch pipeline is connected to the first main pipeline through a second three-way piece; and / or,

[0018] The third branch pipeline is communicated with the main pipeline through a third three-way piece.

[0019] In one of the embodiments, a smoke induced draft fan and a return flow fan are arranged on the smoke conveying pipeline, and the smoke induced draft fan and the return flow fan are arranged in sequence along the flow direction of the smoke.

[0020] In one embodiment, the regenerative combustion system further includes a smoke exhaust pipeline, the inlet of which is connected to and communicates with the smoke delivery pipeline, and the inlet of which is located between the outlet of the smoke induced draft fan and the inlet of the return fan.

[0021] In one embodiment, the regenerative combustion system further includes a third temperature sensor, a first control valve, and a control unit conductively connected to the third temperature sensor and the first control valve;

[0022] The third temperature sensor is used to monitor the flame temperature of the heating furnace;

[0023] The control unit is used to adjust the opening of the first control valve based on the flame temperature, thereby adjusting the smoke emission flow of the smoke exhaust pipeline.

[0024] In one of the embodiments, the combustion-aiding agent delivery pipeline is provided with an air compressor.

[0025] In one embodiment, the fuel delivery pipeline includes a main fuel pipeline and a plurality of branch fuel pipelines, the inlet of each branch fuel pipeline is connected to the outlet of the main fuel pipeline, and the outlet is connected to the corresponding nozzle;

[0026] The heat storage combustion system also includes a plurality of second control valves and a control module conductively connected to the plurality of control valves, each second control valve being arranged on a corresponding fuel branch pipeline, and the second control valve being used to control the opening and closing of each second control valve based on the temperature of the flue gas ejected from the corresponding nozzle after heat storage.

[0027] In the above-mentioned heat storage combustion system, when the flue gas ejected from the nozzle of the heating furnace is stored in the heat storage body, the temperature of the flue gas can be much lower than the flame temperature in the heating furnace, generally not more than 150°. The low-temperature flue gas after heat storage can flow back to the heating furnace through the flue gas conveying pipeline, thereby reducing the flame temperature in the heating furnace (for example, it can be reduced to below 1100°C) to meet industrial requirements and realize energy-saving combustion of the combustion system at the most economical air-fuel ratio to avoid energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG1 is a schematic diagram of the fluid flow direction of a regenerative combustion system provided in an embodiment of the present application when the first nozzle sprays smoke.

[0029] FIG2 is a schematic diagram of the fluid flow direction of a regenerative combustion system provided in an embodiment of the present application when the second nozzle sprays smoke.

[0030] The reference numerals in the accompanying drawings are described as follows:

[0031] 10. Regenerative combustion system; 100. Heating furnace; 110. Nozzle; 111. First nozzle; 112. Second nozzle; 120. Regenerative body; 121. First regenerative body; 122. Second regenerative body; 200. Fuel delivery pipeline; 210. Fuel main pipeline; 211. Stop valve; 220. Fuel branch pipeline; 221. Second control valve; 300. Combustion aid delivery pipeline; 310. Air compressor; 400. Smoke delivery pipeline; 410. First branch pipeline; 420. Second branch pipeline; 430. Third branch pipeline; 440. Smoke induced draft fan; 450. Return fan; 510. First main pipeline; 520. Second main pipeline; 600. Reversing valve; 710. First three-way fitting; 720. Second three-way fitting; 730. Third three-way fitting; 800. Smoke exhaust pipeline. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0033] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0034] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0035] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0036] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0038] Referring to Figures 1 and 2, an embodiment of the present application provides a heat storage combustion system 10, which includes a heating furnace 100, a fuel delivery pipeline 200, an oxidation-aiding agent delivery pipeline 300 and a flue gas delivery pipeline 400. The heating furnace 100 is provided with a plurality of nozzles 110, wherein each nozzle 110 is provided with a heat storage body 120, and the heat storage body 120 is used to store the heat of the flue gas ejected by the corresponding nozzle 110; when the temperature of the flue gas ejected from the corresponding nozzle 110 after heat storage in the corresponding heat storage body 120 is lower than a preset temperature, the flue gas delivery pipeline 400 transports the heat-stored flue gas to the remaining nozzles 110, the fuel delivery pipeline 200 transports the fuel to the remaining nozzles 110, and the oxidation-aiding agent delivery pipeline 300 transports the oxidation-aiding agent to the remaining nozzles 110, and the remaining nozzles 110 spray the heat-stored flue gas, fuel and oxidation-aiding agent into the heating furnace 100. It should be noted that the arrows in FIG. 1 and FIG. 2 represent the flow direction of the fluid in each pipeline.

[0039] The regenerative combustion system 10 can be applied to the fields of forging plant steel billet preheating, industrial raw material drying, etc., which use the industrial heating furnace 100. The fuel delivered by the fuel delivery pipeline 200 can be at least one of liquid fuel and gas fuel, and the combustion aid delivered by the combustion aid delivery pipeline 300 can be at least one of air and pure oxygen.

[0040] When the flue gas ejected from the nozzle 110 of the heating furnace 100 is stored in the heat storage body 120, the temperature can be much lower than the flame temperature in the heating furnace 100, generally not more than 150°. The low-temperature flue gas after heat storage can flow back to the heating furnace 100 through the flue gas conveying pipeline 400, thereby reducing the flame temperature in the heating furnace 100 (for example, it can be reduced to below 1100°C) to meet industrial requirements and realize energy-saving combustion of the combustion system at the most economical air-fuel ratio to avoid energy waste.

[0041] As shown in FIG. 1 and FIG. 2 , in some embodiments of the present application, the plurality of nozzles 110 include a first nozzle 111 and a second nozzle 112 . The first nozzle 111 is provided with a first heat storage body 121 , and the second nozzle 112 is provided with a second heat storage body 122 . Specifically, as shown in Figure 1, when the temperature of the flue gas ejected from the first nozzle 111 after heat storage is less than or equal to the preset temperature, or the temperature of the flue gas ejected from the second nozzle 112 after heat storage is greater than the preset temperature, the fuel delivery pipeline 200 and the combustion-aid delivery pipeline 300 are both connected to the second nozzle 112, the inlet of the flue gas delivery pipeline 400 is connected to the first heat storage body 121, and the outlet is connected to the second nozzle 112; and when the temperature of the flue gas ejected from the first nozzle 111 after heat storage is greater than the preset temperature, or the temperature of the flue gas ejected from the second nozzle 112 after heat storage is less than or equal to the preset temperature, the fuel delivery pipeline 200 and the combustion-aid delivery pipeline 300 are both connected to the first nozzle 111, the inlet of the flue gas delivery pipeline 400 is connected to the second heat storage body 122, and the outlet is connected to the first nozzle 111.

[0042] The working process of the regenerative combustion system 10 is described below by taking the heating furnace 100 provided with the first nozzle 111 and the second nozzle 112 as an example:

[0043] As shown in FIG1 , when the fuel and the combustion aid are burned in the heating furnace 100 through the second nozzle 112, the smoke generated by the combustion is ejected from the first nozzle 111 into the first heat storage body 121. The first heat storage body 121 stores most of the heat of the smoke to reduce the temperature of the smoke. After the smoke is stored in the first heat storage body 121, it flows back to the second nozzle 112 through the smoke delivery pipe 400, and then enters the heating furnace 100 to reduce the flame temperature of the heating furnace 100; at the same time, the fuel also flows to the second nozzle 112 through the fuel delivery pipeline 200, and the combustion aid also flows to the second nozzle 112 through the combustion aid delivery pipeline 300. The second nozzle 112 then sprays the fuel and the combustion aid into the heating furnace 100 for combustion.

[0044] As shown in FIG2 , when the temperature of the flue gas after heat storage in the first heat storage body 121 is greater than a preset temperature (e.g., 150° C.), the fuel flows to the first nozzle 111 through the fuel delivery pipeline 200, and the combustion aid also flows to the first nozzle 111 through the combustion aid delivery pipeline 300, and the first nozzle 111 sprays the fuel and the combustion aid into the heating furnace 100 for combustion. Afterwards, the flue gas generated by the combustion is sprayed from the second nozzle 112 into the second heat storage body 122, and the second heat storage body 122 stores most of the heat of the flue gas to reduce the temperature of the flue gas. After storing heat in the second heat storage body 122, the flue gas flows back to the first nozzle 111 through the flue gas conveying pipe 400, and then enters the heating furnace 100 to reduce the flame temperature of the heating furnace 100; at the same time, the fuel also flows to the first nozzle 111 through the fuel conveying pipeline 200, and the combustion aid also flows to the first nozzle 111 through the combustion aid conveying pipeline 300, and the first nozzle 111 sprays the fuel and the combustion aid into the heating furnace 100 for combustion.

[0045] If the temperature of the flue gas after heat storage in the second heat storage body 122 is also greater than the preset temperature (e.g., 150° C.), the combustion system will work according to the process shown in FIG1. ​​That is, during the entire combustion process, the combustion system will repeatedly cycle according to the processes shown in FIG1 and FIG2 to ensure that the flame temperature of the heating furnace 100 meets the industrial requirements during the entire combustion process.

[0046] It can be seen that the above combustion system can not only simplify the structure, but also ensure that the flame temperature of the heating furnace 100 meets industrial requirements during the entire combustion process.

[0047] Continuing to refer to Figures 1 and 2, specifically, in some embodiments of the present application, the first heat storage body 121 is connected to and communicated with the first main pipeline 510, the second heat storage body 122 is connected to and communicated with the second main pipeline 520, the first main pipeline 510 and the second main pipeline 520 are connected through a reversing valve 600, and the reversing valve 600 is also connected to the outlet of the combustion-supporting agent delivery pipeline 300 and has a first working state and a second working state; the flue gas delivery pipeline 400 includes a first branch pipeline 410, a second branch pipeline 420 and a third branch pipeline 430, the inlet of the first branch pipeline 410 is connected to the reversing valve 600, and the outlet is respectively connected to the first branch pipeline 410 and the second branch pipeline 430. The inlet of the second branch pipeline 420 and the inlet of the third branch pipeline 430 are connected and communicated with each other, the outlet of the second branch pipeline 420 is connected and communicated with the first main pipeline 510, and the outlet of the third branch pipeline 430 is connected and communicated with the second main pipeline 520; when the reversing valve 600 is in the first working state, the combustion aid delivery pipeline 300 is communicated with the second main pipeline 520, and the inlet of the first branch pipeline 410 is communicated with the first main pipeline 510; and when the reversing valve 600 is in the second working state, the combustion aid delivery pipeline 300 is communicated with the first main pipeline 510, and the inlet of the first branch pipeline 410 is communicated with the second main pipeline 520.

[0048] The present application can allow the flue gas after heat storage in the heat accumulator 120 to flow back into the heating furnace 100 to reduce the flame temperature of the heating furnace 100 by simply adding a second branch pipeline 420 and a third branch pipeline 430 on the basis of the original combustion system. That is, the heat storage combustion system 10 of the present application not only has obvious energy-saving effects, but also has few structural changes.

[0049] Furthermore, the thermal storage combustion system 10 also includes a first temperature sensor, a second temperature sensor, and a control module conductively connected to the first temperature sensor, the second temperature sensor, and the reversing valve 600; the first temperature sensor is used to monitor the temperature of the flue gas ejected from the first nozzle 111 after heat storage; the second temperature sensor is used to monitor the temperature of the flue gas ejected from the second nozzle 112 after heat storage; the control module is used to control the reversing valve 600 to switch between the first working state and the second working state based on the temperature of the flue gas ejected from the first nozzle 111 after heat storage or the temperature of the flue gas ejected from the second nozzle 112 after heat storage.

[0050] When the first temperature sensor detects that the temperature of the flue gas ejected from the first nozzle 111 after heat storage is greater than the preset temperature, the control module switches the reversing valve 600 from the first working state shown in FIG1 to the second working state shown in FIG2. When the second temperature sensor detects that the temperature of the flue gas ejected from the first nozzle 110 after heat storage is greater than the preset temperature, the control module switches the reversing valve 600 from the second working state shown in FIG2 to the first working state shown in FIG1. ​​Through the cooperation of the first temperature sensor, the second temperature sensor, the reversing valve 600 and the control module, the working state of the reversing valve 600 can be automatically adjusted according to the actual working conditions to ensure that the flame temperature of the heating furnace 100 can meet industrial requirements during the entire combustion process and improve the degree of automation of the combustion system.

[0051] The first temperature sensor may be disposed on the first heat storage body 121, and the second temperature sensor may be disposed on the second heat storage body 122. The control module may be a controller originally integrated with the combustion system.

[0052] 1 and 2 , the first branch pipeline 410 is connected to the second branch pipeline 420 and the third branch pipeline 430 through the first three-way piece 710; and / or the second branch pipeline 420 is connected to the first main pipeline 510 through the second three-way piece 720; and / or the third branch pipeline 430 is connected to the main pipeline through the third three-way piece 730. The three-way piece facilitates the connection of various pipelines.

[0053] Referring to FIG. 1 and FIG. 2 , in some embodiments of the present application, a smoke induced draft fan 440 and a return flow fan 450 are provided on the smoke conveying pipeline 400, and the smoke induced draft fan 440 and the return flow fan 450 are sequentially arranged along the flow direction of the smoke. The smoke induced draft fan 440 can guide the smoke in the heating furnace 100 to flow toward the smoke conveying pipeline 400, and the return flow fan 450 can ensure that the smoke can smoothly flow back into the heating furnace 100.

[0054] The smoke exhaust fan 440 and the return fan 450 are arranged on the first branch pipeline 410 of the smoke conveying pipeline 400 .

[0055] Further, referring to FIG. 1 and FIG. 2 , the regenerative combustion system 10 further includes a flue gas exhaust pipeline 800, the inlet of which is connected and communicated with the flue gas delivery pipeline 400, and the inlet of the flue gas exhaust pipeline 800 is located between the outlet of the flue gas induced draft fan 440 and the inlet of the return fan 450. Since the temperature of the flue gas after heat storage in the regenerator 120 is different, in order to ensure that the flame temperature of the heating furnace 100 meets industrial requirements, the flow rate of the flue gas return can be adjusted based on the temperature of the flue gas after heat storage in the regenerator 120. It can be understood that the lower the temperature of the flue gas after heat storage in the regenerator 120, the greater the flue gas flow rate discharged from the flue gas exhaust pipeline 800, that is, the smaller the flow rate of the flue gas return.

[0056] Specifically, the regenerative combustion system 10 also includes a third temperature sensor, a first control valve, and a control unit conductively connected to the third temperature sensor and the third control valve; the third temperature sensor is used to monitor the flame temperature of the heating furnace 100; the control module is used to adjust the opening of the first control valve based on the flame temperature, and then adjust the flue gas discharge flow rate of the flue gas exhaust pipeline 800. It can be understood that the larger the opening of the first control valve, the larger the flue gas flow rate discharged from the flue gas exhaust pipeline 800. Through the cooperation of the third temperature sensor, the first control valve and the control module, the flue gas discharge flow rate of the flue gas exhaust pipeline 800 can be automatically adjusted according to the actual working conditions to ensure that the flame temperature of the heating furnace 100 can meet industrial requirements during the entire combustion process, thereby improving the degree of automation of the combustion system.

[0057] The third temperature sensor may be disposed on the heating furnace 100. The control module may be a controller originally integrated with the combustion system.

[0058] As shown in FIG. 1 and FIG. 2 , in some embodiments of the present application, the combustion-supporting agent delivery pipeline 300 is provided with an air compressor 310. The air compressor 310 can compress the combustion-supporting agent to ensure that the combustion-supporting agent can flow smoothly into the heating furnace 100.

[0059] As shown in FIG. 1 and FIG. 2, in some embodiments of the present application, the fuel delivery pipeline 200 includes a fuel main pipeline 210 and a plurality of fuel branch pipelines 220, the inlet of each fuel branch pipeline 220 is connected to the outlet of the fuel main pipeline 210, and the outlet is connected to the corresponding nozzle 110; the thermal storage combustion system 10 also includes a plurality of second control valves 221 and a control module conductively connected to the plurality of second control valves 221, each second control valve 221 is arranged on the corresponding fuel branch pipeline 220, and the second control valve 221 is used to control the opening and closing of each second control valve 221 based on the temperature of the flue gas ejected from the corresponding nozzle 110 after heat storage. As an example, as shown in FIG. 1 and FIG. 2, the plurality of fuel branch pipelines 220 include two fuel branch pipelines 220, each fuel branch pipeline 220 is provided with a second control valve 221, and the control module is also conductively connected to the first temperature sensor and the second temperature sensor.

[0060] When the first temperature sensor detects that the temperature of the flue gas ejected from the first nozzle 111 after heat storage is greater than the preset temperature, the control module switches the reversing valve 600 from the first working state shown in FIG. 1 to the second working state shown in FIG. 2, and at this time, the control module closes the second control valve 221 on the fuel branch pipeline 220 connected to the second nozzle 112, and opens the second control valve 221 on the fuel branch pipeline 220 connected to the first nozzle 111. When the second temperature sensor detects that the temperature of the flue gas ejected from the first nozzle 110 after heat storage is greater than the preset temperature, the control module switches the reversing valve 600 from the second working state shown in FIG. 2 to the first working state shown in FIG. 1, and at this time, the control module closes the second control valve 221 on the fuel branch pipeline 220 connected to the first nozzle 111, and opens the second control valve 221 on the fuel branch pipeline 220 connected to the second nozzle 112. Through the cooperation of the second control module valve and the control module, the switch of the second control valve 221 on each fuel branch pipeline can be automatically controlled according to the actual working conditions to ensure that the heating furnace 100 can operate normally during the entire combustion process, thereby improving the degree of automation of the combustion system.

[0061] The second control valve 221 may be a solenoid valve, the control module may be a controller originally integrated in the combustion system, and a shut-off valve 211 is provided on the main fuel line 210 , and the shut-off valve 211 may be a manual shut-off valve.

[0062] In summary, the regenerative combustion system 10 provided by the present application not only realizes energy-saving combustion by operating the combustion system at the most economical air-fuel ratio, but also reduces the fuel energy saving rate by more than 15% at the same heating power. It can also reduce the smoke emission by about 70%, while reducing the load of the air compressor and the subsequent out-of-stock cost.

[0063] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0064] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A regenerative combustion system, characterized in that: include: A heating furnace, a fuel delivery pipeline, an oxidant delivery pipeline and a flue gas delivery pipeline, wherein the heating furnace is provided with a plurality of nozzles, wherein each nozzle is provided with a heat storage body, and the heat storage body is used to store the heat of the flue gas ejected by the corresponding nozzle; When the temperature of the flue gas ejected from the corresponding nozzle after heat storage in the corresponding heat storage body is lower than the preset temperature, the flue gas delivery pipeline delivers the heat-stored flue gas to the remaining nozzles, the fuel delivery pipeline delivers the fuel to the remaining nozzles, and the combustion aid delivery pipeline delivers the combustion aid to the remaining nozzles, and the remaining nozzles spray the heat-stored flue gas, the fuel and the combustion aid into the heating furnace.

2. The regenerative combustion system according to claim 1, characterized in that: The plurality of nozzles include a first nozzle and a second nozzle, the first nozzle is provided with a first heat storage body, and the second nozzle is provided with a second heat storage body; When the temperature of the flue gas ejected from the first nozzle after heat storage is less than or equal to the preset temperature, or the temperature of the flue gas ejected from the second nozzle after heat storage is greater than the preset temperature, the fuel delivery pipeline and the combustion-supporting agent delivery pipeline are both connected to the second nozzle, the inlet of the flue gas delivery pipeline is connected to the first heat storage body, and the outlet is connected to the second nozzle; When the temperature of the flue gas ejected from the first nozzle after heat storage is greater than the preset temperature, or the temperature of the flue gas ejected from the second nozzle after heat storage is less than or equal to the preset temperature, the fuel delivery pipeline and the combustion aid delivery pipeline are both connected to the first nozzle, the inlet of the flue gas delivery pipeline is connected to the second heat storage body, and the outlet is connected to the first nozzle.

3. The regenerative combustion system according to claim 2, characterized in that: The first heat storage body is connected and communicated with a first main pipeline, the second heat storage body is connected and communicated with a second main pipeline, the first main pipeline and the second main pipeline are connected through a reversing valve, and the reversing valve is also connected to the outlet of the combustion-supporting agent delivery pipeline and has a first working state and a second working state; The smoke delivery pipeline includes a first branch pipeline, a second branch pipeline and a third branch pipeline, the inlet of the first branch pipeline is connected to the reversing valve, and the outlet is respectively connected to and communicated with the inlet of the second branch pipeline and the inlet of the third branch pipeline, the outlet of the second branch pipeline is connected to and communicated with the first main pipeline, and the outlet of the third branch pipeline is connected to and communicated with the second main pipeline; When the reversing valve is in the first working state, the combustion aid delivery pipeline is connected to the second main pipeline, and the inlet of the first branch pipeline is connected to the first main pipeline; and when the reversing valve is in the second working state, the combustion aid delivery pipeline is connected to the first main pipeline, and the inlet of the first branch pipeline is connected to the second main pipeline.

4. The regenerative combustion system according to claim 3, characterized in that: The regenerative combustion system further includes a first temperature sensor, a second temperature sensor, and a control module electrically connected to the first temperature sensor, the second temperature sensor, and the reversing valve; The first temperature sensor is used to monitor the temperature of the flue gas ejected from the first nozzle after heat storage; The second temperature sensor is used to monitor the temperature of the flue gas ejected from the second nozzle after heat storage; The control module is used to control the reversing valve to switch between the first working state and the second working state based on the temperature of the flue gas ejected from the first nozzle after heat storage or the temperature of the flue gas ejected from the second nozzle after heat storage.

5. The regenerative combustion system according to claim 3, characterized in that: The first branch pipeline is connected with the second branch pipeline and the third branch pipeline through a first tee piece; and / or, The second branch pipeline is connected to the first main pipeline through a second three-way piece; and / or, The third branch pipeline is communicated with the main pipeline through a third three-way piece.

6. The regenerative combustion system according to any one of claims 1 to 5, characterized in that: The smoke conveying pipeline is provided with a smoke induced draft fan and a return flow fan, and the smoke induced draft fan and the return flow fan are arranged in sequence along the flow direction of the smoke.

7. The regenerative combustion system according to claim 6, characterized in that: The regenerative combustion system also includes a smoke exhaust pipeline, the inlet of which is connected to and communicates with the smoke delivery pipeline, and the inlet of which is located between the outlet of the smoke induced draft fan and the inlet of the return fan.

8. The regenerative combustion system according to claim 7, characterized in that: The regenerative combustion system further includes a third temperature sensor, a first control valve, and a control unit conductively connected to the third temperature sensor and the first control valve; The third temperature sensor is used to monitor the flame temperature of the heating furnace; The control unit is used to adjust the opening of the first control valve based on the flame temperature, thereby adjusting the smoke emission flow of the smoke exhaust pipeline.

9. The regenerative combustion system according to any one of claims 1 to 5, characterized in that: The combustion-supporting agent delivery pipeline is provided with an air compressor.

10. The regenerative combustion system according to any one of claims 1 to 5, characterized in that: The fuel delivery pipeline includes a main fuel pipeline and a plurality of branch fuel pipelines, the inlet of each branch fuel pipeline is connected to the outlet of the main fuel pipeline, and the outlet is connected to the corresponding nozzle; The heat storage combustion system also includes a plurality of second control valves and a control module conductively connected to the plurality of second control valves, each second control valve being arranged on a corresponding fuel branch pipeline, and the second control valve being used to control the opening and closing of each second control valve based on the temperature of the flue gas ejected from the corresponding nozzle after heat storage.

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