Sintering exhaust gas heat storage and peak shaving system

Abstract

This invention discloses a sintering waste gas heat storage and peak-shaving system, comprising: a medium-high temperature waste heat recovery unit, having a medium-high temperature section of a cooler and a medium-high temperature waste heat boiler; the medium-high temperature section of the cooler has an adjacent high-temperature section and a medium-temperature section; the high-temperature section is connected to the high-temperature inlet of the medium-high temperature waste heat boiler via a high-temperature pipeline, and the medium-temperature section is connected to the medium-temperature inlet of the medium-high temperature waste heat boiler via a medium-temperature pipeline; a low-temperature waste heat recovery unit, having a low-temperature section of a cooler and a low-temperature waste heat boiler; the low-temperature section and the medium-temperature section are adjacent, and the low-temperature waste heat boiler is connected to the low-temperature section via a low-temperature pipeline; and a heat storage unit, connected to both the medium-high temperature waste heat recovery unit and the low-temperature waste heat recovery unit. This invention utilizes the heat storage unit to store heat during periods of low heat demand and release heat during periods of high heat demand, achieving heat storage and peak-shaving, and storing and releasing heat as needed.

Description

Technical Field

[0001] This invention relates to the field of sintering waste heat recovery technology, and in particular to a sintering waste gas heat storage and peak shaving system. Background Technology

[0002] Sintering waste heat recovery is an important aspect of energy conservation and emission reduction in steel enterprises. As steel enterprises gradually strengthen their awareness of energy conservation and environmental protection, the recovery of high-temperature waste heat from sintering coolers has become widespread. With the improvement of cooler equipment, especially the improvement of cooler sealing performance, the low-temperature waste heat temperature in the three stages of the cooler can reach about 200℃~250℃. The amount of waste gas is considerable and has certain recycling value. Therefore, the next step is to recover the large amount of low-temperature waste gas generated during the sintering cooler cooling process, which will inevitably improve the energy utilization rate of the sintering ore production process and reduce process energy consumption.

[0003] Furthermore, thermal storage systems are a crucial component of energy conversion and utilization technologies, playing a key role in areas such as flexible peak shaving for coal-fired power units. Selecting appropriate thermal storage technologies is of great significance for improving energy efficiency and achieving peak shaving and valley filling. Solid-state thermal storage technology refers to thermal storage technologies that use solids as the primary heat storage medium or the main component of the heat storage body. It possesses numerous advantages, including relatively constant volume, wide availability of materials, stable chemical properties, low cost, and good heat storage capacity. Therefore, applying solid-state thermal storage technology to the recovery of waste heat from sintering low-temperature exhaust gas to achieve efficient energy utilization will bring substantial economic benefits to enterprises.

[0004] Currently, the mainstream process flow for sintering cooler exhaust gas recovery systems includes the sintering cooler and a waste heat boiler connected to it. The waste heat boiler is connected to a cooler air box unit located below the sintering cooler via a fan. The waste heat boiler is used to exchange heat with the incoming high-temperature exhaust gas (including the high-temperature exhaust gas generated from the first and second stages of the cooler) and generate low-temperature exhaust gas. The fan is used to send the low-temperature exhaust gas discharged from the waste heat boiler into the cooler air box through pipelines, supplying cold air into the sintering cooler. In addition to the low-temperature exhaust gas, if additional cold air is needed, it is sent into the cooler air box via a blower. The temperature of the flue gas in the third stage of the cooler can reach about 200℃. Currently, the only technology is to install multiple hot water heat exchangers in the third stage of the cooler to utilize the waste heat of the low-temperature exhaust gas from the sintering cooler.

[0005] Because the heat of the low-temperature exhaust gas in the three stages of the cooler fluctuates greatly, it cannot be continuously and effectively recovered and utilized, which has a significant impact on users who require a stable heat source. In addition, during periods of low heat demand or when the medium- and high-temperature waste heat boiler stops operating, the excess high-temperature exhaust gas in the medium- and high-temperature stages of the cooler is generally released into the atmosphere through the chimney without being recovered and utilized, resulting in a serious waste of the sensible heat of the high-temperature exhaust gas. Summary of the Invention

[0006] The purpose of this invention is to provide a sintering waste gas heat storage and peak shaving system that can stably recover and utilize the waste heat of the waste gas in the low-temperature section of the cooler. At the same time, when the heat consumption of the medium- and high-temperature waste heat boiler is at a low point or when it is not running, the heat storage device can be used to store the excess high-temperature flue gas in the medium- and high-temperature section of the cooler, thereby improving energy utilization efficiency.

[0007] The above-mentioned objectives of this invention are mainly achieved by the following technical solutions:

[0008] This invention provides a sintering waste gas thermal storage and peak-shaving system, comprising:

[0009] The medium-high temperature waste heat recovery unit has a medium-high temperature section of a cooler and a medium-high temperature waste heat boiler. The medium-high temperature section of the cooler has a high temperature section and a medium temperature section of the cooler arranged adjacent to each other. The high temperature section of the cooler is connected to the high temperature inlet of the medium-high temperature waste heat boiler through a high temperature pipe, and the medium temperature section of the cooler is connected to the medium temperature inlet of the medium-high temperature waste heat boiler through a medium temperature pipe.

[0010] The low-temperature waste heat recovery unit includes a low-temperature section of a cooler and a low-temperature waste heat boiler. The low-temperature section of the cooler is arranged adjacent to the medium-temperature section of the cooler, and the low-temperature waste heat boiler is connected to the low-temperature section of the cooler through a low-temperature pipeline.

[0011] The heat storage unit is connected to the medium-high temperature waste heat recovery unit and the low temperature waste heat recovery unit, respectively.

[0012] A fume hood partition wall is provided between the high-temperature section and the medium-temperature section of the cooler, and between the medium-temperature section and the low-temperature section of the cooler.

[0013] In a preferred embodiment of the present invention, the heat storage unit has a heat storage device, and the heat storage device is connected to a heat storage circuit and a heat release circuit. The heat storage circuit is connected to the medium-high temperature waste heat recovery unit, and the heat release circuit is connected to the low temperature waste heat recovery unit.

[0014] In a preferred embodiment of the present invention, the thermal storage circuit includes a thermal storage inlet pipe and a thermal storage outlet pipe, the high-temperature pipe is connected to the inlet of the thermal storage device through the thermal storage inlet pipe, and the medium-temperature pipe is connected to the outlet of the thermal storage device through the thermal storage outlet pipe.

[0015] In a preferred embodiment of the present invention, a first shut-off valve is provided on the heat storage inlet pipe, and a second shut-off valve is provided on the heat storage outlet pipe.

[0016] In a preferred embodiment of the present invention, the heat release circuit includes a heat release inlet pipe and a heat release outlet pipe. One end of the heat release inlet pipe is connected to the inlet of the heat storage device, and the other end is connected to the low-temperature pipe on the side near the low-temperature section of the cooler. One end of the heat release outlet pipe is connected to the outlet of the heat storage device, and the other end is connected to the low-temperature pipe on the side near the low-temperature waste heat boiler.

[0017] In a preferred embodiment of the present invention, a third shut-off valve is provided on the heat release inlet pipe, and a fourth shut-off valve is provided on the heat release outlet pipe.

[0018] In a preferred embodiment of the present invention, a first fan is provided at the inlet or outlet of the thermal storage device.

[0019] In a preferred embodiment of the present invention, a fifth shut-off valve is provided on the cryogenic pipeline, the fifth shut-off valve being located on the cryogenic pipeline between the heat release inlet pipe and the heat release outlet pipe.

[0020] In a preferred embodiment of the present invention, the outlet of the medium-high temperature waste heat boiler is connected to the high temperature section and the medium temperature section of the cooler respectively through a first air inlet pipe, and a second fan is provided on the first air inlet pipe.

[0021] In a preferred embodiment of the present invention, a second air inlet pipe is connected to the low-temperature section of the cooler, and a third fan is provided on the second air inlet pipe.

[0022] Compared with the prior art, the technical solution of the present invention has the following characteristics and advantages:

[0023] First, the present invention can recover the waste heat of low-temperature exhaust gas in the cooling section through a low-temperature waste heat boiler, thereby improving the efficiency of energy recovery and utilization.

[0024] Secondly, the heat storage unit can store the heat of high-temperature waste gas during periods of low external heat demand and release the stored heat during periods of high heat demand, thus achieving heat storage and peak shaving, storing and releasing as needed, and ensuring the stability of the heat of the gas introduced into the low-temperature waste heat boiler. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0026] Figure 1This is a schematic diagram of the connection structure of the sintering waste gas heat storage and peak shaving system described in this invention.

[0027] Figure 2 This is a schematic diagram of the connection structure of another embodiment of the sintering waste gas heat storage and peak shaving system of the present invention.

[0028] Explanation of icon numbers:

[0029] 10. Medium- and high-temperature waste heat recovery unit; 11. Low-temperature waste heat recovery unit; 12. Heat storage unit;

[0030] 20. Cooler; 21. High-temperature section of cooler; 211. High-temperature section of cooler; 212. Medium-temperature section of cooler; 22. Low-temperature section of cooler; 23. Unrecovered section of cooler; 24. Fume hood partition wall;

[0031] 30. Medium- and high-temperature waste heat boiler; 31. High-temperature pipeline; 32. High-temperature inlet; 33. Medium-temperature pipeline; 34. Medium-temperature inlet;

[0032] 40. Low-temperature waste heat boiler; 41. Low-temperature pipeline; 411. Fifth shut-off valve;

[0033] 50. Thermal storage device; 51. First blower;

[0034] 60. Thermal storage circuit; 61. Thermal storage inlet pipe; 611. First shut-off valve; 62. Thermal storage outlet pipe; 621. Second shut-off valve;

[0035] 70. Heat release circuit; 71. Heat release inlet pipe; 711. Third shut-off valve; 72. Heat release outlet pipe; 721. Fourth shut-off valve;

[0036] 80. First air inlet duct; 81. Second fan;

[0037] 90. Second air inlet duct; 91. Third fan. Detailed Implementation

[0038] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0039] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0041] The above-mentioned objectives of this invention are mainly achieved by the following technical solutions:

[0042] like Figure 1 and Figure 2 As shown, the present invention provides a sintering waste gas heat storage and peak-shaving system, comprising: a medium-high temperature waste heat recovery unit 10, having a medium-high temperature section 21 of a cooler and a medium-high temperature waste heat boiler 30; the medium-high temperature section 21 of the cooler has an adjacent high temperature section 211 and a medium temperature section 212 of the cooler; the high temperature section 211 is connected to the high temperature inlet 32 ​​of the medium-high temperature waste heat boiler 30 through a high temperature pipe 31; the medium temperature section 212 is connected to the medium temperature inlet 34 of the medium-high temperature waste heat boiler 30 through a medium temperature pipe 33; low temperature section 211 is connected to the medium temperature inlet 34 of the medium-high temperature waste heat boiler 30. The waste heat recovery unit 11 includes a low-temperature section 22 of the cooler and a low-temperature waste heat boiler 40. The low-temperature section 22 of the cooler is arranged adjacent to the medium-temperature section 212 of the cooler. The low-temperature waste heat boiler 40 is connected to the low-temperature section 22 of the cooler through a low-temperature pipe 41. The heat storage unit 12 is connected to the medium-high temperature waste heat recovery unit 10 and the low-temperature waste heat recovery unit 11 respectively. A fume hood partition wall 24 is provided between the high-temperature section 211 of the cooler and the medium-temperature section 212 of the cooler, and between the medium-temperature section 212 of the cooler and the low-temperature section 22 of the cooler.

[0043] The sintering waste gas heat storage peak shaving system of the present invention is equipped with a heat storage unit 12 capable of storing heat. During the low heat consumption period of the medium-high temperature waste heat boiler 30, the heat storage unit 12 can store the heat in the high temperature flue gas. During the high heat consumption period of the medium-high temperature waste heat boiler 30, the heat storage unit 12 stops storing heat and can release the stored heat to increase the temperature of the low temperature flue gas. The heated low temperature flue gas enters the low temperature waste heat boiler 40, thereby ensuring the stability of the heat of the low temperature flue gas entering the low temperature waste heat boiler 40.

[0044] On the one hand, it can avoid the waste of energy caused by directly emitting high-temperature flue gas during the low heat consumption period and improve the energy utilization rate; on the other hand, it can also avoid the problem of insufficient heat of low-temperature flue gas in the low-temperature section 22 of the cooler during the peak heat consumption period and ensure the normal operation of the entire low-temperature waste heat recovery unit 11.

[0045] Specifically, such as Figure 1 As shown, in the conventional sintering waste heat recovery process, the temperature of the sintered product in the cooler 20 gradually decreases along the running direction of the conveyor belt. To ensure high waste heat utilization efficiency, the sintering waste heat in the cooler 20 is usually recovered segment by segment. In this embodiment, along the running direction of the conveyor belt, the sintering machine is sequentially divided into a high-temperature section 21, a low-temperature section 22, and a non-recovered section 23. The high-temperature section 21 is further divided into a high-temperature section 211 and a medium-temperature section 212. Fume hoods 24 are installed between the high-temperature section 211 and the medium-temperature section 212, between the medium-temperature section 212 and the low-temperature section 22, and between the low-temperature section 22 and the non-recovered section 23. The fume hoods 24 can block the flow of flue gas and ensure that the flue gas temperature in different areas remains stable within a certain range.

[0046] The sintered products, driven by a conveyor belt, sequentially pass through the high-temperature section 211, the medium-temperature section 212, the low-temperature section 22, and the unrecovered section 23 of the cooler. Gas enters the high-temperature section 211 from the bottom of the cooler 20 and exchanges heat with the sintered products within it, generating high-temperature flue gas. In this embodiment, the temperature of the high-temperature flue gas generated through the high-temperature section 211 is between 400°C and 500°C. Gas enters the medium-temperature section 212 from the bottom of the cooler 20 and exchanges heat with the sintered products within it, generating medium-temperature flue gas. In this embodiment, the temperature of the medium-temperature flue gas generated through the medium-temperature section 212 is between 300°C and 350°C. After the gas enters the low-temperature section 22 of the cooler from the bottom of the cooler 20, it exchanges heat with the sintering products in the low-temperature section 22, thereby generating low-temperature flue gas. Under normal circumstances, the temperature of the sintering products is low after passing through the high-temperature section 211 and the medium-temperature section 212 of the cooler. The temperature of the sintering products entering the low-temperature section 22 of the cooler is affected by the heat exchange rate in the high-temperature section 211 and the medium-temperature section 212 of the cooler. Therefore, the temperature fluctuation of the low-temperature flue gas generated after exchanging heat with the gas in the low-temperature section 22 of the cooler is large.

[0047] The high-temperature flue gas and medium-temperature flue gas generated in the high-temperature section 211 and the medium-temperature section 212 of the cooler are used in the medium-high temperature waste heat boiler 30 to recover waste heat. The high-temperature flue gas enters the high-temperature inlet 32 ​​of the medium-high temperature waste heat boiler 30 through the high-temperature pipe 31 and undergoes heat exchange treatment in the high-temperature section of the medium-high temperature waste heat boiler 30; the medium-temperature flue gas enters the medium-temperature inlet 34 of the medium-high temperature waste heat boiler 30 through the medium-temperature pipe 33 and undergoes heat exchange treatment in the medium-temperature section of the medium-high temperature waste heat boiler 30.

[0048] According to one embodiment of the present invention, such as Figure 1 As shown, the outlet of the medium-high temperature waste heat boiler 30 is connected to the high temperature section 211 and the medium temperature section 212 of the cooler through the first air inlet pipe 80, and a second fan 81 is provided on the first air inlet pipe 80.

[0049] After the high-temperature and medium-temperature flue gas exchange heat and cool down in the medium-high temperature waste heat boiler 30, it enters the first air inlet duct 80 through the outlet of the medium-high temperature waste heat boiler 30. The first air inlet duct 80 is connected to the high-temperature section 211 and the medium-temperature section 212 of the cooler. The high-temperature duct 31, the medium-temperature duct 33, and the first air inlet duct 80 form a circulation loop between the medium-high temperature section 21 of the cooler and the medium-high temperature waste heat boiler 30. The second fan 81 provides power for the entire circulation loop. The gas exchanges heat and heats up in the medium-high temperature section 21 of the cooler, enters the medium-high temperature waste heat boiler 30 through the high-temperature duct 31 and the medium-temperature duct 33, exchanges heat and cools down in the medium-high temperature waste heat boiler 30, and then enters the medium-high temperature section 21 of the cooler again through the first air inlet duct 80.

[0050] Preferably, the first air inlet duct 80 is provided with an air inlet that communicates with the outside air. When the air volume in the high-temperature waste heat recovery unit 10 is insufficient, the air inlet is opened to supplement the air in the circulation loop.

[0051] The low-temperature flue gas generated in the low-temperature section 22 of the cooler is used in the low-temperature waste heat boiler 40 to recover waste heat from the flue gas. The low-temperature flue gas generated in the low-temperature section 22 of the cooler enters the low-temperature waste heat boiler 40 through the low-temperature pipe 41, where it undergoes heat exchange and cooling. The generated exhaust gas is discharged into the atmosphere through the outlet of the low-temperature waste heat boiler 40, or it can be connected to the inlet of the fan in the lower air box of the cooler to participate in circulating cooling, or it can be used for sintering ignition and heat preservation or hot air sintering.

[0052] According to one embodiment of the present invention, such as Figure 1 As shown, a second air inlet duct 90 is connected to the low-temperature section 22 of the cooler, and a third fan 91 is installed on the second air inlet duct 90. The third fan 91 can send air into the low-temperature section 22 of the cooler through the second air inlet duct 90. The air is heated by heat exchange in the low-temperature section 22 of the cooler, and then enters the low-temperature waste heat boiler 40 through the low-temperature pipe 41, where it is cooled by heat exchange.

[0053] The heat storage unit 12 is connected to both the medium-high temperature waste heat recovery unit 10 and the low-temperature waste heat recovery unit 11, enabling peak-shaving heat storage and on-demand storage. During the off-peak hours of the medium-high temperature waste heat boiler 30, the heat generated by the high-temperature flue gas in the medium-high temperature section 21 of the cooler exceeds the boiler's demand. In existing technologies, the excess high-temperature flue gas is typically directly released into the atmosphere, resulting in energy waste. However, in this invention, a portion of the high-temperature flue gas during the off-peak hours is fed into the heat storage unit 12. The heat storage unit 12 exchanges heat with the high-temperature flue gas, storing the heat and avoiding the energy waste caused by direct atmospheric release. During the peak heat consumption period of the medium-high temperature waste heat boiler 30, the gas circulation in the medium-high temperature waste heat recovery unit 10 is relatively fast. Therefore, the temperature of the sintering products in the medium-high temperature section 21 of the cooler drops rapidly, resulting in insufficient heat of the low-temperature flue gas generated in the low-temperature section 22 of the cooler, which cannot meet the heat exchange requirements of the low-temperature waste heat boiler 40. At this time, part of the low-temperature flue gas generated in the low-temperature section 22 of the cooler is introduced into the heat storage unit 12. The heat storage unit 12 performs heat release treatment. After the low-temperature flue gas is heated by heat exchange in the heat storage unit 12, it is mixed with another part of the low-temperature flue gas that has not been heated by heat exchange and then introduced into the low-temperature waste heat boiler 40 to meet the heat consumption requirements of the low-temperature waste heat boiler 40.

[0054] According to one embodiment of the present invention, such as Figure 1 As shown, the heat storage unit 12 has a heat storage device 50, and a heat storage circuit 60 and a heat release circuit 70 are connected to the heat storage device 50. The heat storage circuit 60 is connected to the medium and high temperature waste heat recovery unit 10, and the heat release circuit 70 is connected to the low temperature waste heat recovery unit 11.

[0055] Specifically, the thermal storage device 50 is composed of one or more of the following: magnesia brick thermal storage device, concrete thermal storage device, hot rock thermal storage device, gravel thermal storage device, or other solids with thermal storage properties.

[0056] The heat storage circuit 60 includes a heat storage inlet pipe 61 and a heat storage outlet pipe 62. The high-temperature pipe 31 is connected to the inlet of the heat storage device 50 through the heat storage inlet pipe 61, and the medium-temperature pipe 33 is connected to the outlet of the heat storage device 50 through the heat storage outlet pipe 62. During the off-peak period of heat consumption of the medium- and high-temperature waste heat boiler 30, the high-temperature flue gas in the high-temperature pipe 31 enters the heat storage device 50 through the heat storage inlet pipe 61 and undergoes heat exchange and cooling within the heat storage device 50. The heat in the high-temperature flue gas is stored within the heat storage device 50. The flue gas generated after heat exchange and cooling enters the medium-temperature pipe 33 through the heat storage outlet pipe 62, mixes with the medium-temperature flue gas in the medium-temperature pipe 33, and then enters the medium-temperature inlet 34 of the medium- and high-temperature waste heat boiler 30.

[0057] Furthermore, a first shut-off valve 611 is provided on the heat storage inlet pipe 61, and a second shut-off valve 621 is provided on the heat storage outlet pipe 62. During the off-peak period of heat consumption of the medium- and high-temperature waste heat boiler 30, the first shut-off valve 611 and the second shut-off valve 621 are opened, and the heat storage circuit 60 is connected to the high-temperature pipeline 31 and the medium-temperature pipeline 33, and the heat storage device 50 stores heat.

[0058] The heat release circuit 70 includes a heat release inlet pipe 71 and a heat release outlet pipe 72. One end of the heat release inlet pipe 71 is connected to the inlet of the heat storage device 50, and the other end is connected to a low-temperature pipe 41 near the low-temperature section 22 of the cooler. One end of the heat release outlet pipe 72 is connected to the outlet of the heat storage device 50, and the other end is connected to a low-temperature pipe 41 near the low-temperature waste heat boiler 40. During the peak heat consumption period of the medium- and high-temperature waste heat boiler 30, some of the low-temperature flue gas in the low-temperature pipe 41 enters the heat storage device 50 through the heat release inlet pipe 71. The heat storage device 50 releases heat, and the low-temperature flue gas is heated by heat exchange. After being heated, the generated flue gas flows back into the low-temperature pipe 41 through the heat release outlet pipe 72, mixes with the low-temperature flue gas that has not undergone heat exchange treatment, and is heated again before entering the low-temperature waste heat boiler 40.

[0059] Furthermore, a third shut-off valve 711 is provided on the heat release inlet pipe 71, and a fourth shut-off valve 721 is provided on the heat release outlet pipe 72. During the peak heat consumption period of the medium-high temperature waste heat boiler 30, the third shut-off valve 711 and the fourth shut-off valve 721 are opened, while the first shut-off valve 611 and the second shut-off valve 621 are closed. The heat release circuit 70 is connected to the low-temperature pipeline 41, and the heat storage device 50 releases heat, thereby increasing the temperature of the low-temperature flue gas in the low-temperature pipeline 41 to meet the heat consumption demand of the low-temperature waste heat boiler 40.

[0060] According to one embodiment of the present invention, such as Figure 1 and Figure 2 As shown, a first fan 51 is provided at the inlet or outlet of the heat storage device 50. The first fan 51 provides power when the heat storage circuit 60 or the heat release circuit 70 is turned on.

[0061] According to one embodiment of the present invention, the fifth shut-off valve 411 on the low-temperature pipeline 41 is located on the low-temperature pipeline 41 between the heat release inlet pipe 71 and the heat release outlet pipe 72; during the peak heat consumption period of the low-temperature waste heat boiler 40, the flow rate of the low-temperature flue gas entering the heat release circuit 70 can be controlled by adjusting the opening degree of the fifth shut-off valve 411, thereby controlling the temperature of the flue gas entering the low-temperature waste heat boiler 40 and avoiding insufficient heat of the flue gas entering the low-temperature waste heat boiler 40.

[0062] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A sintering waste gas heat storage and peak-shaving system, characterized in that, include: The medium-high temperature waste heat recovery unit has a medium-high temperature section of a cooler and a medium-high temperature waste heat boiler. The medium-high temperature section of the cooler has a high temperature section and a medium temperature section of the cooler arranged adjacent to each other. The high temperature section of the cooler is connected to the high temperature inlet of the medium-high temperature waste heat boiler through a high temperature pipe, and the medium temperature section of the cooler is connected to the medium temperature inlet of the medium-high temperature waste heat boiler through a medium temperature pipe. The low-temperature waste heat recovery unit includes a low-temperature section of a cooler and a low-temperature waste heat boiler. The low-temperature section of the cooler is arranged adjacent to the medium-temperature section of the cooler, and the low-temperature waste heat boiler is connected to the low-temperature section of the cooler through a low-temperature pipeline. The heat storage unit is connected to the medium-high temperature waste heat recovery unit and the low temperature waste heat recovery unit, respectively. Among them, fume hood partitions are provided between the high temperature section and the medium temperature section of the cooler, and between the medium temperature section and the low temperature section of the cooler; The thermal storage unit has a thermal storage device, which is connected to a thermal storage circuit and a heat release circuit. The thermal storage circuit is connected to the medium-high temperature waste heat recovery unit, and the heat release circuit is connected to the low temperature waste heat recovery unit. The thermal storage circuit includes a thermal storage inlet pipe and a thermal storage outlet pipe. The high-temperature pipe is connected to the inlet of the thermal storage device through the thermal storage inlet pipe, and the medium-temperature pipe is connected to the outlet of the thermal storage device through the thermal storage outlet pipe. The heat release circuit includes a heat release inlet pipe and a heat release outlet pipe. One end of the heat release inlet pipe is connected to the inlet of the heat storage device, and the other end is connected to the low-temperature pipe on the side near the low-temperature section of the cooler. One end of the heat release outlet pipe is connected to the outlet of the heat storage device, and the other end is connected to the low-temperature pipe on the side near the low-temperature waste heat boiler.

2. The sintering waste gas heat storage and peak-shaving system according to claim 1, characterized in that, The heat storage inlet pipe is equipped with a first shut-off valve, and the heat storage outlet pipe is equipped with a second shut-off valve.

3. The sintering waste gas heat storage and peak-shaving system according to claim 1, characterized in that, The heat release inlet pipe is equipped with a third shut-off valve, and the heat release outlet pipe is equipped with a fourth shut-off valve.

4. The sintering waste gas heat storage and peak-shaving system according to claim 1, characterized in that, A first fan is provided at the inlet or outlet of the thermal storage device.

5. The sintering waste gas heat storage and peak-shaving system according to claim 1, characterized in that, The cryogenic pipeline is equipped with a fifth shut-off valve, which is located on the cryogenic pipeline between the heat release inlet pipe and the heat release outlet pipe.

6. The sintering waste gas heat storage and peak-shaving system according to claim 1, characterized in that, The outlet of the medium-high temperature waste heat boiler is connected to the high temperature section and the medium temperature section of the cooler through a first air inlet pipe, and a second fan is provided on the first air inlet pipe.

7. The sintering waste gas heat storage and peak-shaving system according to claim 1, characterized in that, The cooler has a second air inlet pipe connected to its low-temperature section, and a third fan is installed on the second air inlet pipe.

Images