Cement kiln exhaust gas waste heat storage peak shaving system

Abstract

The utility model discloses a cement kiln waste gas waste heat storage peak shaving system, which is characterized in that in the initial stage of heat storage, part of hot waste gas from a grate cooler enters a heat storage device for heat storage through a first branch gas path, and then is sent to a tail air inlet of a kiln head waste heat boiler through a fourth branch gas path; in the later stage of heat storage, hot waste gas in the heat storage device enters the air mixer through a second branch gas path to be mixed with hot waste gas of the main waste gas pipeline, and then enters a main flue gas inlet of the kiln head waste heat boiler; in the initial stage of heat release, low-temperature hot waste gas enters a heat storage device through a fifth branch gas path, enters an air mixer through left sections of a third branch gas path and a second branch gas path after absorbing heat, is mixed with hot waste gas of a main waste gas pipeline and then enters a main flue gas inlet of a kiln head waste heat boiler for heat exchange; and in the later stage of heat release, hot waste gas is sent to a tail air inlet of the kiln head waste heat boiler through the third branch gas path, the right section of the second branch gas path and the fourth branch gas path to enter the kiln head waste heat boiler. According to the system, the heat of hot waste gas from the grate cooler is stored through the heat storage device during valley electricity, the stored heat is released through the heat storage device during peak electricity, and the purpose of storing and releasing heat for peak regulation through waste heat of the waste gas is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of industrial waste heat recovery and utilization, and specifically relates to a cement kiln exhaust gas waste heat storage and peak regulation system. Background Art

[0002] Waste heat resources of different qualities are generated during the cement production process, mainly including the hot air exhausted from the grate cooler at the kiln head and the hot exhaust gas exhausted from the C1 cylinder of the preheater at the kiln tail. Currently, cement companies have built waste heat power generation devices to fully recycle and utilize these two parts of heat, significantly reducing the energy consumption of the cement production process.

[0003] On the other hand, with the growth of installed capacity of new energy sources, the contradiction of grid peak regulation has become increasingly prominent. It is difficult to meet the demand for energy consumption by relying solely on traditional peak regulation of power generation and grid-side energy storage.

[0004] Therefore, there is an urgent need to develop a cement kiln exhaust gas waste heat storage peak-shaving system that can have a peak-shaving function and greatly improve its power generation revenue. Utility Model Content

[0005] In order to solve the problems and shortcomings of the existing cement kiln waste heat power generation system, the utility model provides a cement kiln exhaust gas waste heat storage peak regulation system, which has a peak regulation function and greatly improves its power generation income.

[0006] In order to achieve the above object, the utility model is realized by the following technical solutions:

[0007] A cement kiln waste gas waste heat storage peak regulation system, comprising a cement clinker production system, a waste heat power generation system and a waste gas heat storage system, the cement clinker production system comprising a grate cooler, the waste heat power generation system comprising a kiln head waste heat boiler, the kiln head waste heat boiler is provided with a main flue gas inlet and a tail air inlet, the waste gas heat storage system comprises a heat storage device and an air mixer, the hot waste gas outlet of the grate cooler is connected to the main flue gas inlet of the kiln head waste heat boiler through a main waste gas pipeline, the air mixer is arranged on the main waste gas pipeline, and the heat storage device is connected to the waste heat power generation system through a first branch gas path, a second branch gas path, a third branch gas path, a fourth branch gas path, and a fifth branch gas path;

[0008] In the early stage of heat storage, part of the hot exhaust gas from the grate cooler enters the heat storage device through the first branch air path for heat storage, and then is sent to the tail air inlet of the kiln head waste heat boiler through the fourth branch air path; in the late stage of heat storage, the hot exhaust gas in the heat storage device is mixed with the hot exhaust gas from the main exhaust gas pipeline in the air mixer through the second branch air path, and then enters the main flue gas inlet of the kiln head waste heat boiler;

[0009] In the initial stage of heat release, the low-temperature hot exhaust gas enters the heat storage device through the fifth branch gas line, and after absorbing heat, it enters the air mixer through the third branch gas line and the left section of the second branch gas line to mix with the hot exhaust gas from the main exhaust gas pipeline, and then enters the main flue gas inlet of the kiln head waste heat boiler for heat exchange; in the later stage of heat release, the hot exhaust gas is sent to the rear air inlet of the kiln head waste heat boiler through the third branch gas line, the right section of the second branch gas line, and the fourth branch gas line to enter the kiln head waste heat boiler.

[0010] Furthermore, the heat storage device is a brick-built heat storage body structure, including a first heat storage gas port and a second heat storage gas port. The heat storage device is provided with an insulation layer structure on the outside, and a plurality of refractory bricks are arranged inside for storing the heat of the hot exhaust gas. An ash discharge device is also provided at the bottom.

[0011] Furthermore, the air mixer includes a first air mixing port, a second air mixing port and a third air mixing port, the main exhaust gas pipeline is connected to the first air mixing port and the second air mixing port, and the third air mixing port is connected to the first heat storage air port of the heat storage device through a second branch air path.

[0012] Furthermore, a fourth electrically-controlled valve and a fifth electrically-controlled valve are arranged on the second branch air circuit, one end of the third branch air circuit is connected to the second heat storage air port of the heat storage device, and the other end is arranged between the fourth electrically-controlled valve and the fifth electrically-controlled valve and connected to the second branch air circuit, the left section of the second branch air circuit is from the air mixer to the connection point of the second branch air circuit and the third branch air circuit, and the left section of the second branch air circuit is from the connection point of the second branch air circuit and the third branch air circuit to the first heat storage air port of the heat storage device.

[0013] Furthermore, the first branch air circuit is connected to the hot exhaust gas outlet of the grate cooler and the second heat storage gas outlet, and the first electrically controlled valve is arranged on the first branch air circuit.

[0014] Furthermore, one end of the fourth branch air circuit is connected to the rear air inlet of the kiln head waste heat boiler, and the other end is connected to the right section of the second branch air circuit.

[0015] Furthermore, the exhaust gas heat storage system also includes a blower, one end of the fifth branch air path is connected to the blower, and the other end is connected to the right section of the second branch air path.

[0016] Furthermore, the waste heat power generation system also includes a steam turbine, a generator, a dust collector, an induced draft fan and a chimney, and the blower is connected to the flue gas pipeline between the flue gas outlet of the kiln head waste heat boiler and the dust collector.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The utility model provides a cement kiln exhaust gas waste heat storage peak-shaving system. Since the power grid implements peak and valley electricity prices, the electricity consumption is high during the day, which is the peak, and the electricity consumption is low at night, which is the valley. During the valley electricity period at night, the system stores part of the heat of the hot exhaust gas from the grate cooler through a heat storage device, reduces the steam output of the kiln head waste heat boiler, and reduces the power generation power of the generator; and during the daytime peak period, the heat storage device releases the stored heat to increase the steam output of the kiln head waste heat boiler and improve the power generation power of the generator, thereby achieving the purpose of utilizing the cement kiln exhaust gas waste heat storage peak-shaving. The system can inspire power users to actively participate in power grid balancing and has broad economic prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a system flow chart of the utility model;

[0020] In the above figure: 1, grate cooler; 2, heat storage device; 2-1, first heat storage air port; 2-2, second heat storage air port;

[0021] 3. Ash removal device; 4. Air mixer; 5. Kiln head waste heat boiler; 6. Dust collector; 7. Induced draft fan; 8. Chimney; 9. Steam turbine; 10. Generator; 11. Rotary kiln; 12. Decomposition furnace; 13. Preheater; 14. First electric control valve; 15. Second electric control valve; 16. Third electric control valve; 17. Fourth electric control valve; 18. Fifth electric control valve; 19. Tail air inlet; 20. High temperature superheater; 21. Low temperature superheater; 22. Steam turbine supplementary steam port; 23. Steam turbine main steam port; 24. Blower; 25. Sixth electric control valve;

[0022] 26. Main exhaust gas pipeline; 27. First branch gas pipeline; 28. Second branch gas pipeline; 29. ​​Third branch gas pipeline; 30. Fourth branch gas pipeline; 31. Fifth branch gas pipeline. DETAILED DESCRIPTION

[0023] The specific implementation of the utility model is further explained below in conjunction with the accompanying drawings.

[0024] like Figure 1 As shown, a cement kiln exhaust gas waste heat storage peak-shaving system includes a cement clinker production system, a waste heat power generation system and an exhaust gas heat storage system, wherein the exhaust gas heat storage system and the waste heat power generation system are arranged in parallel.

[0025] The cement clinker production system comprises a preheater 13, a decomposition furnace 12, a rotary kiln 11 and a grate cooler 1; one end of the rotary kiln 11 is connected to the grate cooler 1, and the other end is connected to the decomposition furnace; the decomposition furnace 12 is connected to the preheater 13; the raw material enters from the preheater 13, is decomposed by the decomposition furnace 12, is further calcined in the rotary kiln 11, and is cooled in the grate cooler 1, completing the entire process of calcining the raw material into clinker, and the clinker generated by the conversion is discharged from the tail of the grate cooler 1.

[0026] A main exhaust gas pipeline 26 is arranged between the hot exhaust gas outlet in the middle of the grate cooler 1 and the main flue gas inlet of the kiln head waste heat boiler 5 of the waste heat power generation system, for extracting hot exhaust gas from the grate cooler 1 and sending it to the kiln head waste heat boiler 5.

[0027] The cement clinker production system is mainly used to produce cement clinker, and utilizes the heat of hot exhaust gas generated by the production of cement clinker to be sent to the waste heat power generation system for heat exchange to generate high-temperature superheated steam and low-temperature superheated steam.

[0028] The waste heat power generation system comprises a kiln head waste heat boiler 5, a steam turbine 9, a generator 10, a dust collector 6, an induced draft fan 7 and a chimney 8; the main flue gas inlet of the kiln head waste heat boiler 5 is connected to the hot exhaust gas outlet in the middle of the grate cooler 1, the flue gas outlet of the kiln head waste heat boiler 5 is connected to the dust collector 6, and the dust collector 6 is connected to the chimney 8 via the induced draft fan 7; a high-temperature superheater 20 and a low-temperature superheater 21 are arranged in the kiln head waste heat boiler 5, a steam turbine main steam port 23 and a steam turbine supplementary steam port 22 are respectively arranged on the steam turbine 9, the high-temperature superheated steam outlet of the high-temperature superheater 20 is connected to the steam turbine main steam port 23, and the low-temperature superheated steam outlet of the low-temperature superheater 21 is connected to the steam turbine supplementary steam port 22.

[0029] A rear air inlet 19 is provided at the front end of the low-temperature superheater 21 of the kiln head waste heat boiler 5, serving as an auxiliary flue gas inlet of the kiln head waste heat boiler 5, and is used to be connected to the pipeline of the waste gas heat storage system.

[0030] The hot exhaust gas extracted from the middle of the grate cooler 1 enters the kiln head waste heat boiler 5 for heat exchange with the feed water in the kiln head waste heat boiler 5. After the feed water absorbs the heat of the hot exhaust gas, high-temperature superheated steam and low-temperature superheated steam are generated, and are discharged from the high-temperature superheater 20 and the low-temperature superheater 21 respectively, and are sent to the main steam port 23 of the steam turbine and the supplementary steam port 22 of the steam turbine respectively. The two superheated steams drive the steam turbine 10 to rotate and do work, thereby driving the generator 10 to generate electricity; and the hot exhaust gas extracted from the grate cooler 1 recovers heat through the kiln head waste heat boiler 5, and is dusted by the dust collector 6, and is discharged from the chimney 8 under the action of the induced draft fan 7, completing the exhaust gas purification process.

[0031] The exhaust gas heat storage system includes a heat storage device 2, an ash removal device 3, an air mixer 4 and a blower 24, and also includes a first branch air circuit 27, a second branch air circuit 28, a third branch air circuit 29, a fourth branch air circuit 30, a fifth branch air circuit 31, a first electrically controlled valve 14, a second electrically controlled valve 15, a third electrically controlled valve 16, a fourth electrically controlled valve 17, a fifth electrically controlled valve 18 and a sixth electrically controlled valve 25.

[0032] The heat storage device 2 is a brick-built heat storage body structure, including a first heat storage gas port 2-1 and a second heat storage gas port 2-2, which are respectively located on both sides of the heat storage device 2 and serve as the hot gas inlet or outlet of the heat storage device 2. The heat storage device 2 is provided with an insulation layer structure on the outside and a plurality of refractory bricks arranged inside for storing the heat of the hot exhaust gas. An ash discharge device 3 is also provided at the bottom of the heat storage device 2. The dust deposited by the hot exhaust gas in the heat storage device 2 is discharged from the heat storage device 2 through the ash discharge device 3.

[0033] The air mixer 4 includes a first air mixing port, a second air mixing port and a third air mixing port. The main exhaust gas pipeline 26 is connected to the first air mixing port and the second air mixing port. The third air mixing port is connected to the first heat storage air port 2-1 of the heat storage device 2 through the second branch air path 28.

[0034] The first branch air path 27 connects the hot exhaust gas outlet in the middle of the grate cooler 1 and the second heat storage gas port 2 - 2 , and the first electrically controlled valve 14 is disposed on the first branch air path 27 .

[0035] The second branch air path 28 connects the first heat storage air port 2-1 and the third air mixing port of the air mixer 4. The fourth electrically-controlled valve 17 and the fifth electrically-controlled valve 18 are arranged on the second branch air path 28. The fifth electrically-controlled valve 18 is arranged on the side of the third air mixing port of the air mixer 4, and the fourth electrically-controlled valve 17 is arranged on the side of the first heat storage air port 2-1 of the heat storage device 2.

[0036] One end of the third branch air path 29 is connected to the second heat storage air port 2 - 2 of the heat storage device 2 , and the other end is arranged between the fourth electrically controlled valve 17 and the fifth electrically controlled valve 18 and connected to the second branch air path 28 .

[0037] Therefore, the second branch air path 28 is actually divided into a left section of the second branch air path and a right section of the second branch air path. The dividing point between the two is the connection point between the third branch air path 29 and the second branch air path 28. The left section of the second branch air path is from the air mixer 4 to the connection point between the second branch air path 28 and the third branch air path 29, and the left section of the second branch air path is from the connection point between the second branch air path 28 and the third branch air path 29 to the first heat storage air port 2-1 of the heat storage device 2.

[0038] Therefore, by opening or closing the fourth electrically controlled valve 17 and the fifth electrically controlled valve 18, the hot exhaust gas in the third branch gas path 29 can be controlled to flow toward the left section of the second branch gas path or the right section of the second branch gas path.

[0039] One end of the fourth branch air path 30 is connected to the rear air inlet 19 of the kiln head waste heat boiler 5, and the other end is arranged on the second branch air path 28 between the fourth electric control valve 17 and the first heat storage air port 2-1, that is, the other end is connected to the right section of the second branch air path.

[0040] One end of the fifth branch air path 31 is connected to the blower 24, and the other end is arranged on the second branch air path 28 between the fourth electric-controlled valve 17 and the first heat storage gas port 2-1, that is, the other end is connected to the right section of the second branch air path, and the blower 24 is connected to the flue gas pipeline arranged between the flue gas outlet of the kiln head waste heat boiler 5 and the dust collector 6, that is, the hot flue gas is transported to the heat storage device 2 through the blower 24 through the fifth branch air path 31.

[0041] The heat storage and heat release processes of the waste gas heat storage system are both achieved by opening or closing each electric control valve to realize the connection and disconnection of each gas path, thereby realizing the operation of the above-mentioned cement kiln waste gas waste heat storage and peak regulation system.

[0042] Specifically: 1. Heat storage process:

[0043] 1) Initial state of heat storage: the second electrically controlled valve 15 and the sixth electrically controlled valve 25 are always kept in a closed state, that is, the third branch gas path 29 and the fifth branch gas path 31 are always in a disconnected state, and the first electrically controlled valve 14 and the fourth electrically controlled valve 17 are always kept in an open state, that is, the first branch gas path 27 and the right section of the second branch gas path are kept unobstructed;

[0044] 2) Initial stage of heat storage: open the third electrically controlled valve 16 and keep it open, close the fifth electrically controlled valve 18, that is, open the fourth branch air path 30, close the left section of the second branch air path, and part of the hot exhaust gas with a temperature of about 390°C coming out of the grate cooler 1 enters the heat storage device 2 through the first branch air path 27 to preliminarily increase the temperature in the heat storage device, and then the relatively low temperature exhaust gas with a temperature of about 250°C is sent to the rear air inlet 19 of the kiln head waste heat boiler 5 through the fourth branch air path 30; at the same time, another part of the hot exhaust gas with a temperature of about 390°C coming out of the grate cooler passes through the main exhaust gas pipeline 26 and the air mixer 4 directly into the main flue gas inlet of the kiln head waste heat boiler 5 for heat exchange.

[0045] The advantage of such a setting is that, considering that the outlet temperature of the heat storage device 2 is relatively low when it is in the initial state, which is about 250°C, if the hot exhaust gas passing through the heat storage device 2 is directly sent to the air mixer 4 for mixing via the second branch gas path 28, the quality of the hot exhaust gas coming out of the grate cooler will be reduced, affecting the heat exchange efficiency of the kiln head waste heat boiler 5. Therefore, the hot exhaust gas entering the kiln head waste heat boiler 5 is divided into two parallel paths to improve the thermal efficiency of the kiln head waste heat boiler 5.

[0046] 3) Heat storage later stage: close the third electrically controlled valve 16, open the fifth electrically controlled valve 18, that is, close the fourth branch air path 30, open the left section of the second branch air path, that is, the second branch air path 28 is in a smooth state, then part of the hot exhaust gas with a temperature of about 390°C coming out of the grate cooler enters the heat storage device 2 through the first branch air path 27 for heat storage, and the relatively high temperature exhaust gas with a temperature of about 300-310°C passes through the second branch air path 28 to the air mixer 4 and is mixed with the hot exhaust gas from the main exhaust gas pipeline 26, and then enters the main flue gas inlet of the kiln head waste heat boiler 5 for heat exchange;

[0047] The advantage of such a configuration is that after a period of heat storage in the heat storage device 2, the flue gas temperature at the outlet of the heat storage device is greatly increased, which is equivalent to the temperature entering the air mixer 4 from the main exhaust gas pipeline 26, and the temperature is about 310°C, and is directly sent to the main flue gas inlet of the kiln head waste heat boiler 5, which can improve the thermal efficiency of the kiln head waste heat boiler 5;

[0048] When the temperature of the hot exhaust gas in the heat storage device 2 reaches the target value, which is about 390°C, the heat of the hot exhaust gas is stored in the heat storage device 2 by adjusting the electric control valves, and then released for heat exchange and power generation through the steam turbine during the peak electricity consumption during the day.

[0049] 2. Exothermic process:

[0050] 1) Initial state of heat release: the second electrically controlled valve 15 and the sixth electrically controlled valve 25 remain in an open state, and the first electrically controlled valve 14 and the fourth electrically controlled valve 17 remain in a closed state, that is, the third branch gas path 29 and the fifth branch gas path 31 remain in an open state, and the first branch gas path 27 and the right section of the second branch gas path remain in a closed state;

[0051] 2) Initial stage of heat release: close the third electrically controlled valve 16, open the fifth electrically controlled valve 18, that is, close the fourth branch gas path 30, open the left section of the second branch gas path, and the low-temperature hot exhaust gas with a temperature of 170-190°C enters the heat storage device 2 from the fifth branch gas path through the blower 24, displacing the heat stored in the heat storage device 2. The temperature of the hot exhaust gas after absorbing heat is about 300-310°C, and enters the air mixer 4 through the third branch gas path 29 and the left section of the second branch gas path. After mixing with the hot exhaust gas from the main exhaust gas pipeline 26, the temperature is about 370-380°C, and enters the main flue gas inlet of the kiln head waste heat boiler 5 for heat exchange;

[0052] The advantage of this arrangement is that, due to the relatively high quality of the hot waste gas during the initial heat release, it can be directly sent to the main flue gas inlet of the kiln head waste heat boiler 5 for heat exchange;

[0053] 3) Heat release later stage: open the third electrically controlled valve 16 and close the fifth electrically controlled valve 18, that is, open the fourth branch gas line 30 and close the left section of the second branch gas line, and send the relatively low temperature hot waste gas of about 250-260° C. in the heat storage device to the tail air inlet 19 of the kiln head waste heat boiler 5 through the third branch gas line 29, the right section of the second branch gas line and the fourth branch gas line 30, and enter the kiln head waste heat boiler 5 for heat exchange;

[0054] The advantage of this arrangement is that since the quality of the hot exhaust gas added to the heat storage device 2 from the fifth branch gas path 31 is reduced during heat release, the main flue gas inlet directly fed into the kiln head waste heat boiler 5 will reduce the heat exchange rate, while the auxiliary flue gas inlet fed into the kiln head waste heat boiler 5 can increase the heat exchange rate.

[0055] The steam source of the steam turbine 9 of the waste heat power generation system is not limited to the outlet steam of the high-temperature superheater 20 and the low-temperature superheater 21. The superheated steam from other sources of the cement kiln can be mixed with the outlet steam of the high-temperature superheater 20 or the low-temperature superheater 21 depending on the steam quality and then sent to the steam turbine supplementary steam port 22 or the steam turbine main steam port 23 respectively.

[0056] The kiln head waste heat boiler 5, grate cooler 1 and heat storage device 2 of the above-mentioned cement kiln exhaust gas waste heat storage peak regulation system are connected through an air mixer 4 to ensure that the outlet exhaust gas temperature of the grate cooler 1 and the heat storage device 2 can enter the kiln head waste heat boiler 5 stably and evenly.

[0057] Since the power grid implements peak and valley electricity prices, electricity consumption is high during the day, which is the peak, and low at night, which is the valley. During the valley period at night, part of the heat from the hot exhaust gas of the grate cooler is stored in the heat storage device 2 to reduce the steam production of the kiln head waste heat boiler 5 and the power generation capacity of the generator 10; and during the peak period during the day, the heat storage device 2 releases the stored heat to increase the steam production of the kiln head waste heat boiler 5 and increase the power generation capacity of the generator 10, thereby achieving the purpose of utilizing the waste heat of cement kiln exhaust gas for heat storage and peak regulation.

[0058] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. However, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cement kiln waste gas waste heat storage peak regulation system, characterized in that: The invention comprises a cement clinker production system, a waste heat power generation system and a waste gas heat storage system. The cement clinker production system comprises a grate cooler (1). The waste heat power generation system comprises a kiln head waste heat boiler (5). The kiln head waste heat boiler (5) is provided with a main flue gas inlet and a tail air inlet (19). The waste gas heat storage system comprises a heat storage device (2) and an air mixer (4). The hot waste gas outlet of the grate cooler (1) is connected to the main flue gas inlet of the kiln head waste heat boiler (5) through a main waste gas pipeline (26). The air mixer (4) is arranged on the main waste gas pipeline (26). The heat storage device (2) is connected to the waste heat power generation system through a first branch gas path (27), a second branch gas path (28), a third branch gas path (29), a fourth branch gas path (30) and a fifth branch gas path (31). In the initial stage of heat storage, part of the hot waste gas from the grate cooler (1) enters the heat storage device (2) through the first branch air path (27) to store heat, and is then sent to the rear air inlet (19) of the kiln head waste heat boiler (5) through the fourth branch air path (30); in the later stage of heat storage, the hot waste gas in the heat storage device (2) passes through the second branch air path (28) to the air mixer (4) to be mixed with the hot waste gas in the main waste gas pipeline (26), and then enters the main flue gas inlet of the kiln head waste heat boiler (5); In the initial stage of heat release, the low-temperature hot waste gas enters the heat storage device (2) through the fifth branch gas path (31), absorbs heat, enters the air mixer (4) through the third branch gas path (29) and the left section of the second branch gas path, mixes with the hot waste gas in the main waste gas pipeline (26), and then enters the main flue gas inlet of the kiln head waste heat boiler (5) for heat exchange; in the later stage of heat release, the hot waste gas is sent to the rear air inlet (19) of the kiln head waste heat boiler (5) through the third branch gas path (29), the right section of the second branch gas path, and the fourth branch gas path (30) and enters the kiln head waste heat boiler (5).

2. A cement kiln waste gas waste heat storage peak-shaving system according to claim 1, characterized in that: The heat storage device (2) is a brick-built heat storage body structure, comprising a first heat storage gas port (2-1) and a second heat storage gas port (2-2). The heat storage device (2) is provided with an insulation layer structure on the outside, and a plurality of refractory bricks are arranged inside for storing the heat of the hot exhaust gas. An ash discharge device (3) is also provided at the bottom.

3. A cement kiln exhaust gas waste heat storage peak-shaving system according to claim 2, characterized in that: The air mixer (4) comprises a first air mixing port, a second air mixing port and a third air mixing port, the main exhaust gas pipeline (26) is connected to the first air mixing port and the second air mixing port, and the third air mixing port is connected to the first heat storage air port (2-1) of the heat storage device (2) via a second branch air path (28).

4. A cement kiln exhaust gas waste heat storage peak-shaving system according to claim 3, characterized in that: A fourth electrically controlled valve (17) and a fifth electrically controlled valve (18) are arranged on the second branch air path (28); one end of the third branch air path (29) is connected to the second heat storage air port (2-2) of the heat storage device (2); the other end is arranged between the fourth electrically controlled valve (17) and the fifth electrically controlled valve (18) and is connected to the second branch air path (28); the left section of the second branch air path is from the air mixer (4) to the connection point between the second branch air path (28) and the third branch air path (29); and the left section of the second branch air path is from the connection point between the second branch air path (28) and the third branch air path (29) to the first heat storage air port (2-1) of the heat storage device (2).

5. A cement kiln waste gas waste heat storage peak regulation system according to claim 2, characterized in that: The first branch air path (27) is connected to the hot exhaust gas outlet of the grate cooler (1) and the second heat storage gas outlet (2-2), and the first electrically controlled valve (14) is arranged on the first branch air path (27).

6. The cement kiln exhaust gas waste heat storage peak-shaving system according to claim 1, characterized in that: One end of the fourth branch air path (30) is connected to the rear air inlet (19) of the kiln head waste heat boiler (5), and the other end is connected to the right section of the second branch air path.

7. The cement kiln exhaust gas waste heat storage peak-shaving system according to claim 1, characterized in that: The exhaust gas heat storage system further comprises a blower (24); one end of the fifth branch air path (31) is connected to the blower (24), and the other end is connected to the right section of the second branch air path.

8. The cement kiln exhaust gas waste heat storage peak-shaving system according to claim 7, characterized in that: The waste heat power generation system further comprises a steam turbine (9), a generator (10), a dust collector (6), an induced draft fan (7) and a chimney (8); the blower (24) is connected to the flue gas outlet of the kiln head waste heat boiler (5) and the flue gas pipeline between the dust collector (6).

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