Distributed reversing blowback system

Abstract

The utility model discloses a distributed reversing blowback system. Comprising unit heat storage boxes, gas pipelines, air pipelines and reversing valves, the unit heat storage boxes are evenly and symmetrically arranged on the two sides of a heating furnace, each unit heat storage box is connected with the corresponding gas pipeline and the corresponding air pipeline, and the corresponding reversing valves are arranged on the gas pipelines and the air pipelines respectively; each unit heat storage box comprises a coal gas heat storage box and an air heat storage box, the coal gas heat storage boxes and the air heat storage boxes are arranged on the heating furnace in an up-down mode, and combustion of the unit heat storage boxes does not interfere with each other; the coal gas pipeline is connected with the coal gas heat storage box through a corresponding reversing valve, the air pipeline is connected with the air heat storage box through a corresponding reversing valve, the coal gas pipeline comprises a reverse blowing pipeline, and the reverse blowing pipeline is connected with the corresponding reversing valve; each unit heat storage box and the corresponding unit heat storage box on the other side of the heating furnace form a set of unit heat storage boxes, and the reversing valves corresponding to each set of unit heat storage boxes work in a linkage mode. The coal gas heat storage box and the air heat storage box in the unit heat storage box are arranged in an up-down mode, the first reversing valve and the second reversing valve corresponding to each group of unit heat storage box are respectively linked to execute reversing action, and each group of unit heat storage box forms an independent heat supply control section, so that when blowback and reversing are carried out, the heat supply efficiency is improved. Blowback and reversing can be carried out group by group, the gas consumption of a blowback pipeline is greatly reduced, the air pressure change in the heating furnace is small, and the stable furnace pressure is ensured.

Description

Technical field:

[0001] The utility model belongs to the technical field of heat storage combustion, and particularly relates to a distributed reversing back-blowing system. Background technology:

[0002] At present, the steel rolling heating furnace in my country's metallurgical industry basically adopts the regenerative combustion technology, and its working characteristics are intermittent air intake combustion and smoke exhaust heat storage alternately, which requires the use of reversing to complete the conversion between heat storage and heat release. The burners on both sides of the furnace are spaced to realize the heating and smoke exhaust functions, the reversing cycle is 60 to 120 seconds, and the reversing process lasts for 3 to 4 seconds.

[0003] Taking gas and gas-side smoke exhaust as an example, the gas and smoke pipes before each reversing valve are independent of each other, but all channels between the reversing valve outlet and the burner (including the burner body) are used by gas and smoke together. During normal production, the burner on the combustion side will switch from the combustion state to the smoke exhaust state, that is, the reversing valve will switch from the gas intake state to the smoke exhaust state. After the reversal, the gas in the public pipeline will be drawn into the smoke exhaust pipe, resulting in gas waste and excessive emission of pollutants.

[0004] In order to solve this problem, people have added a backflush function to the pipeline system. That is, after the gas-side valve plate of the gas reversing valve is cut off, an intermediary gas is used to blow the gas in the common pipeline between the reversing valve and the burner into the furnace for combustion. In this way, when the direction is reversed again, this intermediary gas exists in the common pipeline, and then the soot valve plate of the reversing valve is opened to perform normal smoke exhaust work, which effectively avoids the waste of gas and the problem of excessive emission of pollutants.

[0005] In the existing regenerative heating furnace, the gas heat storage box and the air heat storage box are arranged adjacent to each other, and the gas sprayed from the burner of each gas heat storage box is mixed with the air sprayed from the burners of the two adjacent air heat storage boxes for combustion. Therefore, when switching, a whole section of gas heat storage boxes and air heat storage boxes need to be switched at the same time, and the back-blowing gas consumption is large, and the furnace pressure in the heating furnace fluctuates greatly. How to set a gas heat storage box and an air heat storage box with step-by-step control to reduce the back-blowing gas consumption and stabilize the furnace pressure is a problem that needs to be solved.

[0006] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Utility model content:

[0007] The purpose of the utility model is to provide a distributed reversing backflush system, thereby overcoming the defects in the above-mentioned prior art.

[0008] To achieve the above-mentioned purpose, the utility model provides a distributed reversing back-blowing system, comprising a unit heat storage box, a gas pipeline, an air pipeline, and a reversing valve. The unit heat storage boxes are evenly and symmetrically arranged on both sides of the heating furnace, each unit heat storage box is connected to the corresponding gas pipeline and air pipeline, and the gas pipeline and the air pipeline are respectively provided with corresponding reversing valves; the unit heat storage box comprises a gas heat storage box and an air heat storage box, and the gas heat storage box and the air heat storage box are arranged on the heating furnace in an upper and lower manner, and the combustion between the unit heat storage boxes does not interfere with each other; the gas pipeline is connected to the gas heat storage box through a corresponding reversing valve, and the air pipeline is connected to the air heat storage box through a corresponding reversing valve, and the gas pipeline comprises a back-blowing pipeline, and the back-blowing pipeline is connected to the corresponding reversing valve; each unit heat storage box and the unit heat storage box opposite to the other side of the heating furnace constitute a group of unit heat storage boxes, and the reversing valves corresponding to each group of unit heat storage boxes work in linkage.

[0009] Preferably, in the technical solution, the gas pipeline includes a gas intake pipeline, a backflush pipeline, a soot pipeline, a first common pipeline and a first reversing valve; the gas intake pipeline, the backflush pipeline and the soot pipeline are respectively connected to the first reversing valve; and the first reversing valve and the gas heat storage tank are connected through the first common pipeline.

[0010] Preferably, in the technical solution, the gas intake pipeline includes a gas intake main pipe and a gas intake branch pipe, the gas intake main pipe is connected to the gas source, the gas intake branch pipe is connected to the gas intake main pipe, and the first reversing valve is connected to the gas intake branch pipe; the backflush pipeline includes a backflush main pipe and a backflush branch pipe, the backflush main pipe is connected to the backflush blower, the backflush branch pipe is connected to the backflush main pipe, and the first reversing valve is connected to the backflush branch pipe; the coal smoke pipeline includes a coal smoke main pipe and a coal smoke branch pipe, the coal smoke main pipe is connected to the coal smoke blower, the coal smoke branch pipe is connected to the coal smoke main pipe, and the first reversing valve is connected to the coal smoke branch pipe.

[0011] Preferably, in the technical solution, the first reversing valve includes an air inlet chamber, an air outlet chamber, a partition, and a first pneumatic valve plate. The air inlet chamber is located above the air outlet chamber. A partition is arranged in the air inlet chamber, and the partition divides the air inlet chamber into a gas chamber, a back-blowing chamber, and a smoking chamber which are not connected to each other. The gas chamber, the back-blowing chamber, and the smoking chamber are all connected to the air outlet chamber. The gas chamber is connected to the gas inlet branch pipe, the back-blowing chamber is connected to the back-blowing branch pipe, the smoking chamber is connected to the coal smoke branch pipe, and the air outlet chamber is connected to the first common pipeline. The first pneumatic valve plate is arranged in the gas chamber, the back-blowing chamber, and the smoking chamber. The first pneumatic valve plates in the gas chamber and the back-blowing chamber are linked to each other. When the first pneumatic valve plate in the gas chamber is opened, the first pneumatic valve plate in the back-blowing chamber is closed, and vice versa.

[0012] Preferably, in the technical solution, the gas chamber and the smoke chamber are arranged in parallel, and the back-blowing chamber is located in front of the gas chamber and the smoke chamber. The entire air inlet chamber has a compact structure and occupies a small space, which is convenient for arrangement in a small space.

[0013] Preferably, in the technical solution, the air pipeline includes a combustion-supporting pipeline, an air-smoke pipeline, a second common pipeline and a second reversing valve. The combustion-supporting pipeline and the air-smoke pipeline are respectively connected to the second reversing valve, and the second reversing valve is connected to the air heat storage tank through the second common pipeline.

[0014] Preferably, in the technical solution, the combustion-supporting pipeline includes a combustion-supporting main pipe and a combustion-supporting branch pipe, the combustion-supporting main pipe is connected to the combustion-supporting blower, and the combustion-supporting branch pipe is connected to the combustion-supporting main pipe; the air smoke pipeline includes an air smoke main pipe and an air smoke branch pipe, the air smoke main pipe is connected to the air smoke blower, and the air smoke branch pipe is connected to the air smoke main pipe; the combustion-supporting branch pipe and the air smoke branch pipe are respectively connected to the second reversing valve.

[0015] Preferably, in the technical solution, the second reversing valve includes a combustion chamber, an exhaust chamber, an exhaust chamber, and a second pneumatic valve plate; the combustion chamber and the exhaust chamber are respectively connected to the exhaust chamber, the combustion chamber is connected to the combustion branch pipe, the exhaust chamber is connected to the air smoke branch pipe, and the exhaust chamber is connected to the second common pipeline; the combustion chamber and the exhaust chamber are both provided with a second pneumatic valve plate, and the on-off of the combustion chamber, the exhaust chamber and the exhaust chamber is controlled by the second pneumatic valve plate.

[0016] Preferably, in the technical solution, the first reversing valve and the second reversing valve corresponding to each group of unit heat storage boxes work in linkage respectively; when the first pneumatic valve plate in the gas chamber and the second pneumatic valve plate in the combustion-supporting chamber of one of the unit heat storage boxes are opened, the first pneumatic valve plate in the smoke chamber and the second pneumatic valve plate in the air extraction chamber of another unit heat storage box are opened, and vice versa; when the first pneumatic valve plate in the back-blowing chamber of one of the unit heat storage boxes is opened, the first pneumatic valve plate in the gas chamber and the second pneumatic valve plate in the combustion-supporting chamber are closed, and the first pneumatic valve plate in the smoke chamber and the second pneumatic valve plate in the air extraction chamber of another unit heat storage box are closed, and vice versa.

[0017] Preferably, in the technical solution, a heating station is provided in the heating furnace, and unit heat storage boxes are provided on both the upper and lower sides of the heating station.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The gas heat storage box and the air heat storage box in the unit heat storage box are arranged in an upper and lower manner. The first reversing valve and the second reversing valve corresponding to each group of unit heat storage boxes are respectively linked to perform reversing actions. Each group of unit heat storage boxes forms an independent heating control section. In this way, when backblowing and reversing are performed, backblowing and reversing can be performed in groups, which greatly reduces the gas consumption of the backblowing pipeline, and the air pressure change in the heating furnace is small, ensuring the stability of the furnace pressure. Description of the drawings:

[0020] Figure 1 This is a schematic diagram of the structure of the distributed reversing backflush system of the utility model;

[0021] Figure 2This is the front view of the distributed reversing backflush system of the utility model;

[0022] Figure 3 This is a left view of the distributed reversing backflush system of the utility model;

[0023] Figure 4 This is a top view of the distributed reversing backflush system of the utility model;

[0024] Figure 5 This is a schematic diagram of the structure of the first reversing valve of the utility model;

[0025] Figure 6 This is a front view of the first reversing valve of the utility model;

[0026] Figure 7 for Figure 6 AA section view;

[0027] Figure 8 This is a schematic diagram of the structure of the second reversing valve of the utility model;

[0028] Fig. 9 This is a left view of the second reversing valve of the utility model;

[0029] Fig.10 for Fig. 9 BB section view. Specific implementation method:

[0030] The specific implementation modes of the present invention are described in detail below, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0031] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0032] like Figure 1-4 As shown, a distributed reversing backflush system includes a unit heat storage tank 1, a gas pipeline 2, an air pipeline 3, and a reversing valve. Two rows of unit heat storage tanks 1 are symmetrically arranged on both sides of a heating furnace 4. The heating furnace 4 is arranged in a heating station, wherein one row of unit heat storage tanks 1 is located at the upper part of the heating station, and the other row of unit heat storage tanks 1 is located at the lower part of the heating station. Each unit heat storage tank 1 is connected to a corresponding gas pipeline 2 and air pipeline 3, and corresponding reversing valves are respectively arranged on the gas pipeline 2 and the air pipeline 3;

[0033] The unit heat storage tank 1 comprises a gas heat storage tank 10 and an air heat storage tank 11. The gas heat storage tank 10 and the air heat storage tank 11 are arranged on the heating furnace 4 in an upper and lower manner. The gas heat storage tank 10 and the air heat storage tank 11 are provided with air outlets facing the furnace cavity. The unit heat storage tanks 1 are separated by a certain distance, and the combustion between the unit heat storage tanks 1 does not interfere with each other; each unit heat storage tank 1 and the unit heat storage tank 1 opposite to the other side of the heating furnace 4 constitute a group of unit heat storage tanks 1, and the reversing valves corresponding to each group of unit heat storage tanks 1 work in linkage.

[0034] The gas pipeline 2 includes a gas intake pipeline 20, a backflush pipeline 21, a soot pipeline 22, a first common pipeline 23 and a first reversing valve 24. The gas intake pipeline 20, the backflush pipeline 21 and the soot pipeline 22 are respectively connected to the first reversing valve 24, and the first reversing valve 24 is connected to the gas heat storage tank 10 through the first common pipeline 23.

[0035] The gas intake pipeline 20 includes a gas intake main pipe 200 and a gas intake branch pipe 201. The gas intake main pipe 200 is connected to a gas source, the gas intake branch pipe 201 is connected to the gas intake main pipe 200, and the first reversing valve 24 is connected to the gas intake branch pipe 201; the backflush pipeline 21 includes a backflush main pipe 210 and a backflush branch pipe 211. The backflush main pipe 210 is connected to a backflush blower, the backflush blower is connected to a soot main pipe 220, the backflush branch pipe 211 is connected to the backflush main pipe 210, and the first reversing valve 24 is connected to the backflush branch pipe 211; the soot pipeline 22 includes a soot main pipe 220 and a soot branch pipe 221. The soot main pipe 220 is connected to a soot blower, the soot branch pipe 221 is connected to the soot main pipe 220, and the first reversing valve 24 is connected to the soot branch pipe 221.

[0036] like Figure 5-7As shown, the first reversing valve 24 includes an air inlet chamber 240, an air outlet chamber 241, a partition 242, and a first pneumatic valve plate 243. The air inlet chamber 240 is located above the air outlet chamber 241. A partition 242 is arranged in the air inlet chamber 240. The partition 242 divides the air inlet chamber 240 into a gas chamber 244, a back-blowing chamber 245, and a smoke chamber 246 that are not connected to each other. The gas chamber 244, the back-blowing chamber 245, and the smoke chamber 246 are all connected to the air outlet chamber 241. The gas chamber 244 and the smoke chamber 246 are arranged in parallel. The back-blowing chamber 245 is located in front of the gas chamber 244 and the smoke chamber 246. The entire air inlet chamber 240 structure It is compact, occupies little space, and is easy to arrange in a small space; the gas chamber 244 is connected to the gas inlet branch pipe 201, the backblowing chamber 245 is connected to the backblowing branch pipe 211, the smoking chamber 246 is connected to the coal smoke branch pipe 221, and the gas outlet chamber 241 is connected to the first common pipeline 23; the gas chamber 244, the backblowing chamber 245, and the smoking chamber 246 are all provided with a first pneumatic valve plate 243, and the first pneumatic valve plates 243 in the gas chamber 244 and the backblowing chamber 245 are linked, and when the first pneumatic valve plate 243 in the gas chamber 244 is opened, the first pneumatic valve plate 243 in the backblowing chamber 245 is closed, and vice versa.

[0037] The air pipeline 3 includes a combustion-supporting pipeline 30, an air-smoke pipeline 31, a second common pipeline 32 and a second reversing valve 33. The combustion-supporting pipeline 30 and the air-smoke pipeline 31 are respectively connected to the second reversing valve 33, and the second reversing valve 33 is connected to the air heat storage tank 11 through the second common pipeline 32.

[0038] The combustion-supporting pipeline 30 includes a combustion-supporting main pipe 300 and a combustion-supporting branch pipe 301. The combustion-supporting main pipe 300 is connected to the combustion-supporting fan, and the combustion-supporting branch pipe 301 is connected to the combustion-supporting main pipe 300; the air smoke pipeline 31 includes an air smoke main pipe 310 and an air smoke branch pipe 311. The air smoke main pipe 310 is connected to the air smoke fan, and the air smoke branch pipe 311 is connected to the air smoke main pipe 310; the combustion-supporting branch pipe 301 and the air smoke branch pipe 311 are respectively connected to the second reversing valve 33.

[0039] like Figure 8-10 As shown, the second reversing valve 33 includes a combustion chamber 330, an exhaust chamber 331, an exhaust chamber 332, and a second pneumatic valve plate 333. The combustion chamber 330 and the exhaust chamber 331 are respectively connected to the exhaust chamber 332, the combustion chamber 330 is connected to the combustion branch pipe 301, the exhaust chamber 331 is connected to the empty smoke branch pipe 311, and the exhaust chamber 332 is connected to the second common pipeline 32; the combustion chamber 330 and the exhaust chamber 331 are both provided with a second pneumatic valve plate 333, and the on-off of the combustion chamber 330, the exhaust chamber 331 and the exhaust chamber 332 is controlled by the second pneumatic valve plate 333.

[0040] The first reversing valve 24 and the second reversing valve 33 corresponding to each group of unit heat storage tanks 1 work in linkage respectively; when the first pneumatic valve plate 243 of the gas chamber 244 and the second pneumatic valve plate 333 in the combustion-supporting chamber 330 of one of the unit heat storage tanks 1 are opened, the first pneumatic valve plate 243 of the smoke extraction chamber 246 and the second pneumatic valve plate 333 in the air extraction chamber 331 of the other unit heat storage tank 1 are opened, and vice versa; when the first pneumatic valve plate 243 in the back-blowing chamber 245 of one of the unit heat storage tanks 1 is opened, the first pneumatic valve plate 243 of the gas chamber 244 and the second pneumatic valve plate 333 in the combustion-supporting chamber 330 are closed, and the first pneumatic valve plate 243 of the smoke extraction chamber 246 and the second pneumatic valve plate 333 in the air extraction chamber 331 of the other unit heat storage tank 1 are closed, and vice versa.

[0041] When the heating furnace 4 starts to work, the workpiece is placed at the heating station, and the two rows of unit heat storage boxes 1 start to work, one side of the unit heat storage box 1 starts the combustion mode, and the gas source inputs the gas into the gas chamber 244 through the gas inlet pipe 20, and the first pneumatic valve plate 243 of the gas chamber 244 is opened, and the gas enters the gas heat storage box 10 of the unit heat storage box 1 through the gas outlet chamber 241 and the first common pipe 23, and the combustion-supporting fan of the same unit heat storage box 1 inputs the air into the combustion-supporting chamber 330 through the combustion-supporting pipe 30, and the second pneumatic valve plate 333 in the combustion-supporting chamber 330 is opened, and the air enters the air heat storage box 11 of the unit heat storage box 1 through the exhaust chamber 332 and the second common pipe 32, and the gas heat storage box 10 and the air heat storage box 11 of the unit heat storage box 1 respectively discharge the gas and air into the inner cavity of the heating furnace 4 for mixed combustion. At the same time, the unit heat storage tank 1 on the other side opposite to the combustion side starts the smoke exhaust mode, and the coal smoke fan and the air smoke fan draw air out from the coal smoke pipeline 22 and the air smoke pipeline 31 for discharge respectively. The first pneumatic valve plate 243 of the smoke extraction chamber 246 is opened, and the second pneumatic valve plate 333 of the exhaust chamber 331 is opened. The flue gas burning in the heating furnace enters the gas heat storage tank 10 and the air heat storage tank 11 of the unit heat storage tank 1 respectively. Part of the flue gas is discharged through the first common pipeline 23, the air outlet chamber 241, the smoke extraction chamber 246, and the coal smoke pipeline 22, and the other part of the flue gas is discharged through the second common pipeline 32, the exhaust chamber 332, the exhaust chamber 331, and the air smoke pipeline 31.

[0042] When the unit heat storage tank 1 in the heating furnace 4 needs to be reversed, before the reversal, the unit heat storage tank 1 on the side that is in the combustion mode starts the back-blowing mode, the first pneumatic valve plate 243 of the gas chamber 244 is closed, the gas input is cut off, the second pneumatic valve plate 333 in the combustion chamber 330 is closed, the combustion air input is cut off, the back-blowing air blower is started, the smoke in the coal smoke main pipe 220 is input from the back-blowing pipeline 21 to the back-blowing chamber 245, the first pneumatic valve plate 243 of the back-blowing chamber 245 is started, the smoke enters the air outlet chamber 241 through the back-blowing chamber 245, and the smoke blows the remaining coal gas in the air outlet chamber 241 and the first common pipeline 23 into the inner cavity of the heating furnace 4 for combustion. At the same time, the unit heat storage tank 1 on the other side that is in the smoke exhaust mode enters the stop mode, the first pneumatic valve plate 243 of the smoke extraction chamber 246 of the unit heat storage tank 1 on this side is closed, and the second pneumatic valve plate 333 of the smoke extraction chamber 331 is closed, and the smoke exhaust from the inner cavity of the heating furnace 4 is stopped.

[0043] When the heat storage tank 1 of the side unit in the back-blowing mode completes the back-blowing, the heat storage tank of the side unit starts the smoke exhaust mode, and at the same time, the heat storage tank 1 of the other side unit in the stop mode starts the combustion mode to complete the reversal.

[0044] Since each group of unit heat storage tanks 1 is an independent heat supply control section, when backblowing and reversing are performed, each row of unit heat storage tanks 1 can start from the first group and perform backblowing and reversing one group at a time until the last group completes backblowing and reversing. This greatly reduces the gas consumption of the backblowing pipeline, and the gas pressure change in the heating furnace 4 is small, ensuring the stability of the furnace pressure.

[0045] The foregoing description of specific exemplary embodiments of the utility model is for the purpose of illustration and illustration. These descriptions are not intended to limit the utility model to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the utility model and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the utility model and various different options and changes. The scope of the utility model is intended to be defined by the claims and their equivalents.

Claims

1. A distributed reversing backflush system, comprising a unit heat storage box, a gas pipeline, an air pipeline, and a reversing valve. The unit heat storage boxes are evenly and symmetrically arranged on both sides of the heating furnace. Each unit heat storage box is connected to a corresponding gas pipeline and an air pipeline. The gas pipeline and the air pipeline are respectively provided with corresponding reversing valves; the characteristics are: The unit heat storage box includes a gas heat storage box and an air heat storage box. The gas heat storage box and the air heat storage box are arranged on the heating furnace in an upper and lower manner, and the combustion of the unit heat storage boxes does not interfere with each other; the gas pipeline is connected to the gas heat storage box through a corresponding reversing valve, and the air pipeline is connected to the air heat storage box through a corresponding reversing valve. The gas pipeline includes a backflush pipeline, and the backflush pipeline is connected to the corresponding reversing valve; each unit heat storage box and the unit heat storage box opposite to the other side of the heating furnace constitute a group of unit heat storage boxes, and the reversing valves corresponding to each group of unit heat storage boxes work in linkage.

2. The distributed reversing backflush system according to claim 1 is characterized in that: The gas pipeline includes a gas intake pipeline, a backflush pipeline, a coal smoke pipeline, a first common pipeline and a first reversing valve. The gas intake pipeline, the backflush pipeline and the coal smoke pipeline are respectively connected to the first reversing valve. The first reversing valve is connected to the gas heat storage tank through the first common pipeline.

3. The distributed reversing backflush system according to claim 2 is characterized in that: The gas inlet pipeline includes a gas inlet main pipe and a gas inlet branch pipe, the gas inlet main pipe is connected to the gas source, the gas inlet branch pipe is connected to the gas inlet main pipe, and the first reversing valve is connected to the gas inlet branch pipe; the backflush pipeline includes a backflush main pipe and a backflush branch pipe, the backflush main pipe is connected to the backflush blower, the backflush branch pipe is connected to the backflush main pipe, and the first reversing valve is connected to the backflush branch pipe; the coal smoke pipeline includes a coal smoke main pipe and a coal smoke branch pipe, the coal smoke main pipe is connected to the coal smoke blower, the coal smoke branch pipe is connected to the coal smoke main pipe, and the first reversing valve is connected to the coal smoke branch pipe.

4. The distributed reversing backflush system according to claim 3 is characterized in that: The first reversing valve comprises an air inlet chamber, an air outlet chamber, a partition, and a first pneumatic valve plate. The air inlet chamber is located above the air outlet chamber. A partition is arranged in the air inlet chamber, and the partition divides the air inlet chamber into a gas chamber, a back-blowing chamber, and a smoking chamber which are not connected to each other. The gas chamber, the back-blowing chamber, and the smoking chamber are all connected to the air outlet chamber. The gas chamber is connected to the gas inlet branch pipe, the back-blowing chamber is connected to the back-blowing branch pipe, the smoking chamber is connected to the coal smoke branch pipe, and the air outlet chamber is connected to the first common pipeline. A first pneumatic valve plate is arranged in the gas chamber, the back-blowing chamber, and the smoking chamber. The first pneumatic valve plates in the gas chamber and the back-blowing chamber are linked to each other. When the first pneumatic valve plate in the gas chamber is opened, the first pneumatic valve plate in the back-blowing chamber is closed, and vice versa.

5. The distributed reversing backflush system according to claim 4 is characterized in that: The gas chamber and the smoking chamber are arranged in parallel, and the back-blowing chamber is located in front of the gas chamber and the smoking chamber.

6. The distributed reversing backflush system according to claim 4, characterized in that: The air pipeline includes a combustion-supporting pipeline, an air-smoke pipeline, a second common pipeline and a second reversing valve. The combustion-supporting pipeline and the air-smoke pipeline are respectively connected to the second reversing valve, and the second reversing valve is connected to the air heat storage tank through the second common pipeline.

7. The distributed reversing backflush system according to claim 6, characterized in that: The combustion-supporting pipeline includes a combustion-supporting main pipe and a combustion-supporting branch pipe. The combustion-supporting main pipe is connected to the combustion-supporting fan, and the combustion-supporting branch pipe is connected to the combustion-supporting main pipe; the air smoke pipeline includes an air smoke main pipe and an air smoke branch pipe. The air smoke main pipe is connected to the air smoke fan, and the air smoke branch pipe is connected to the air smoke main pipe; the combustion-supporting branch pipe and the air smoke branch pipe are respectively connected to the second reversing valve.

8. The distributed reversing backflush system according to claim 7, characterized in that: The second reversing valve includes a combustion-supporting chamber, an air extraction chamber, an exhaust chamber, and a second pneumatic valve plate. The combustion-supporting chamber and the air extraction chamber are connected to the exhaust chamber respectively, the combustion-supporting chamber is connected to the combustion-supporting branch pipe, the air extraction chamber is connected to the air smoke branch pipe, and the exhaust chamber is connected to the second common pipeline; the combustion-supporting chamber and the air extraction chamber are both provided with a second pneumatic valve plate, and the on-off of the combustion-supporting chamber, the air extraction chamber and the exhaust chamber is controlled by the second pneumatic valve plate.

9. The distributed reversing backflush system according to claim 8, characterized in that: The first reversing valve and the second reversing valve corresponding to each group of unit heat storage tanks work in linkage respectively; when the first pneumatic valve plate in the gas chamber and the second pneumatic valve plate in the combustion chamber of one unit heat storage tank are opened, the first pneumatic valve plate in the smoke chamber and the second pneumatic valve plate in the exhaust chamber of the other unit heat storage tank are opened, and vice versa; When the first pneumatic valve plate in the back-blowing chamber of one of the unit heat storage boxes is opened, the first pneumatic valve plate in the gas chamber and the second pneumatic valve plate in the combustion-supporting chamber are closed, and the first pneumatic valve plate in the smoke extraction chamber and the second pneumatic valve plate in the exhaust chamber of the other unit heat storage box are closed, and vice versa.

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