High-temperature flue gas heat recovery system of heat recovery coke oven

Abstract

The embodiment of the utility model provides a high-temperature flue gas heat recovery system of a heat recovery coke oven. The high-temperature flue gas heat recovery system comprises a power generation system, a heat recovery coke oven system, a fuel combustion system and a high-temperature flue gas diffusion system, the heat recovery coke oven system comprises a heat recovery coke oven and a coke oven waste heat boiler; the fuel combustion system comprises a fuel combustion chamber and a fuel waste heat boiler, the fuel combustion chamber is provided with a fuel regulator, and the fuel combustion chamber is controlled by the fuel regulator and provides controllable heat for the fuel waste heat boiler, so that the fuel waste heat boiler generates controllable second steam to generate power for the generator set; under the condition that the first steam quantity generated by the coke oven waste heat boiler is unstable, the fuel combustion chamber can be controlled to provide controllable heat for the fuel waste heat boiler by adjusting a fuel adjuster of the fuel combustion chamber, and the controllable second steam quantity generated by the fuel waste heat boiler is complementary with the fluctuating first steam quantity; therefore, the generator set can output stable generating capacity, and impact on a power grid is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of coking production and waste heat recovery, in particular to a heat recovery system for high-temperature flue gas from a heat recovery coke oven. Background Art

[0002] Coking is the process of converting coking coal into coke and raw gas through high-temperature dry distillation (950-1050°C) in a coke oven, isolated from air. Modern coking utilizes chamber coke oven technology. Depending on the method of recovering the raw gas, it is divided into chemical product recovery coking technology and heat recovery coking technology.

[0003] Chemical product recovery coking technology utilizes a slightly positive pressure operation in the carbonization chamber. The raw gas generated in the carbonization chamber is led from a riser to a gas collection pipe. Through cooling, gas-liquid separation, and gas purification, benzene, ammonia, clean gas, and tar are separated from the raw gas. The clean gas is then returned to the coke oven for heating, while other chemical products are further processed and utilized. Coke oven production, chemical product recovery, and processing generate high levels of "three wastes" and energy consumption.

[0004] Heat recovery coking technology uses a slightly negative pressure operation in the carbonization chamber to directly introduce the raw gas produced in the carbonization chamber into the adjacent combustion chamber for combustion, providing the heat required for heating the coke oven. The remaining heat is carried out by the high-temperature flue gas and the waste heat boiler is used to recover the heat to generate water vapor, which is used for steam turbine power generation.

[0005] At present, chemical product recovery coke oven technology is the mainstream, and heat recovery coking technology, as an environmentally friendly coke oven technology, has begun to be favored by the industry.

[0006] Power generation, a key product of heat recovery coking technology besides coke, significantly impacts both its technical and economic viability. When heat recovery coking technology is employed within a steel complex, the generated electricity is integrated into the steel company's internal power grid. Independent coking plants employing heat recovery coking technology also integrate their generated electricity into the national grid. During the grid integration process, power generated by heat recovery coking technology must meet basic grid access requirements: stable and continuous input to avoid fluctuations and minimize impact on the grid. According to electricity trading rules, if power generation companies experience power deviations exceeding a certain range (generally within a range of plus or minus 5%-10%) due to downtime or unplanned outages, they will be fined and assessed.

[0007] Heat recovery coke ovens are internally heated coke ovens. The heat released by raw gas combustion is partially used for dry distillation, partially for steam production and power generation, and the remaining heat is lost through flue gas and system surfaces. During the high-temperature dry distillation process with blended coal, the amount and composition of raw gas generated are highly nonlinear, dependent not only on blended coal quality but also on factors such as the heating rate, excess air ratio, and coking time. The temperature field, flow field, excess air ratio, and composition changes are mutually coupled. Currently, no mature mathematical model exists internationally to describe the generation patterns of raw gas. Therefore, the design and process parameters of heat recovery coke ovens are based on practical experience. Design parameters such as exhaust gas temperature, flow rate, and coking time can deviate significantly from actual production. The associated waste heat power generation system faces similar challenges, and the power generation system design can also deviate from actual production conditions. Furthermore, heat recovery coke ovens and power generation systems, like other coke oven production and steam turbine power generation systems, are subject to production anomalies and accidents. When a heat recovery coke oven malfunctions, a waste heat boiler fails, or the coke oven production schedule is adjusted, the heat recovery coke oven high-temperature flue gas system must also be flexibly adjusted to maximize heat recovery and maintain stable and continuous power generation. To address the challenges of heat recovery coke oven high-temperature flue gas heat recovery for power generation, we have proposed a new process, clearing the way for the large-scale application of heat recovery coking technology. Utility Model Content

[0008] The purpose of the present invention is to provide a heat recovery system for high-temperature flue gas from a coke oven, so that the heat recovery system can provide stable power generation, reduce the impact on the power grid, and meet the needs of power generation and grid connection. The specific technical solution is as follows:

[0009] To achieve the above-mentioned purpose, the present invention provides a heat recovery system for high-temperature flue gas from a coke oven, comprising:

[0010] Power generation systems, including generator sets;

[0011] A heat recovery coke oven system includes a heat recovery coke oven and a coke oven waste heat boiler, wherein the high-temperature flue gas generated by the heat recovery coke oven is used to heat the coke oven waste heat boiler, so that the coke oven waste heat boiler generates first steam to generate electricity for the generator set;

[0012] A fuel combustion system includes a fuel combustion chamber and a fuel waste heat boiler. The fuel combustion chamber has a fuel regulator. The fuel combustion chamber is controlled by the fuel regulator to provide controllable heat to the fuel waste heat boiler, so that the fuel waste heat boiler generates controllable second steam to generate electricity for the generator set.

[0013] The high-temperature flue gas dissipation system is used to discharge high-temperature flue gas from the heat recovery coke oven.

[0014] According to one embodiment of the present utility model application, the heat recovery coke oven system further includes a first high-temperature flue gas dust collector, a first valve and a second valve;

[0015] The inlet of the first high-temperature flue gas dust collector is connected to the flue gas outlet of the heat recovery coke oven, and the outlet of the first high-temperature flue gas dust collector is connected to the coke oven waste heat boiler and the first flue gas outlet of the fuel combustion chamber respectively, so that the high-temperature flue gas generated by the heat recovery coke oven can provide heat to the coke oven waste heat boiler and the fuel combustion chamber respectively;

[0016] The first valve is provided between the first high-temperature flue gas dust collector and the coke oven waste heat boiler, and is used to switch on and off the high-temperature flue gas generated by the heat recovery coke oven for supplying heat to the coke oven waste heat boiler;

[0017] The second valve is arranged between the first high-temperature flue gas dust collector and the first flue gas outlet of the fuel combustion chamber, and is used to turn on and off the high-temperature flue gas generated by the heat recovery coke oven to supply heat to the fuel combustion chamber.

[0018] According to one embodiment of the present utility model application, the high-temperature flue gas dissipation system includes: a third valve and a high-temperature chimney;

[0019] The high-temperature chimney is connected to the outlet of the first high-temperature flue gas dust collector, and the third valve is arranged between the high-temperature chimney and the outlet of the first high-temperature flue gas dust collector, and is used to discharge high-temperature flue gas for the heat recovery coke oven.

[0020] According to one embodiment of the present utility model application, the fuel combustion system further includes: a second high-temperature flue gas dust collector and a fourth valve;

[0021] The inlet of the second high-temperature flue gas dust collector is connected to the second flue gas outlet of the fuel combustion chamber and the fuel waste heat boiler, so that the high-temperature flue gas generated by the fuel combustion chamber can provide heat for the fuel waste heat boiler;

[0022] The fourth valve is arranged between the inlet of the second high-temperature flue gas dust collector and the second flue gas outlet of the fuel combustion chamber, and is used to turn on and off the high-temperature flue gas generated by the fuel combustion chamber to supply the fuel waste heat boiler.

[0023] According to one embodiment of the present utility model application, it also includes:

[0024] The combustion-supporting gas supply system provides combustion-supporting gas to the heat recovery coke oven and the fuel combustion chamber.

[0025] According to one embodiment of the present utility model application, the heat recovery coke oven system also includes: a secondary combustion chamber, which is arranged between the high-temperature flue gas outlet of the heat recovery coke oven and the inlet of the first high-temperature flue gas dust collector, and is used for secondary combustion of the high-temperature flue gas generated by the heat recovery coke oven.

[0026] According to one embodiment of the present utility model application, the combustion-supporting gas supply system also provides combustion-supporting gas to the secondary combustion chamber.

[0027] According to one embodiment of the present utility model application, the heat recovery coke oven system further comprises: a first flue gas desulfurization and denitrification device, a first induced draft fan and a chimney;

[0028] The first flue gas desulfurization and denitrification device is connected to the exhaust port of the coke oven waste heat boiler and the chimney respectively, and the first induced draft fan is arranged between the exhaust port of the first flue gas desulfurization and denitrification device and the chimney.

[0029] According to one embodiment of the present utility model application, the fuel combustion system further includes: a second flue gas desulfurization and denitrification device and a second induced draft fan;

[0030] The second flue gas desulfurization and denitrification device is connected to the exhaust port of the fuel waste heat boiler and the chimney respectively, and the second induced draft fan is arranged between the exhaust port of the second flue gas desulfurization and denitrification device and the chimney.

[0031] According to one embodiment of the present utility model application, it also includes:

[0032] The desalted water supply system provides desalted water to the coke oven waste heat boiler and the fuel waste heat boiler.

[0033] Beneficial effects of the embodiments of the present utility model:

[0034] The heat recovery system for high-temperature flue gas from a heat recovery coke oven provided by the embodiment of the utility model comprises a power generation system, a heat recovery coke oven system, a fuel combustion system and a high-temperature flue gas dissipation system. The heat recovery coke oven system includes a heat recovery coke oven and a coke oven waste heat boiler, the high-temperature flue gas generated by the heat recovery coke oven provides heat to the coke oven waste heat boiler, so that the coke oven waste heat boiler generates a first steam to generate electricity for the generator set; the fuel combustion system includes a fuel combustion chamber and a fuel waste heat boiler, the fuel combustion chamber has a fuel regulator, the fuel combustion chamber is controlled by the fuel regulator, and provides controllable heat to the fuel waste heat boiler, so that the fuel waste heat boiler generates a controllable second steam to generate electricity for the generator set; in an embodiment of the present application, when the high-temperature flue gas generated by the heat recovery coke oven is unstable and the amount of first steam generated by the coke oven waste heat boiler is unstable, the fuel regulator of the fuel combustion chamber can be adjusted to control the fuel combustion chamber to provide controllable heat to the fuel waste heat boiler, and the fuel waste heat boiler generates a controllable second steam amount that complements the fluctuating first steam amount, thereby providing a relatively stable total steam amount for the generator set, so that the generator set can output a relatively stable power generation amount, reducing the impact on the power grid.

[0035] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments can also be obtained based on these drawings.

[0037] Figure 1 This is a schematic structural diagram of a heat recovery system for high-temperature flue gas from a heat recovery coke oven according to an embodiment of the present application.

[0038] The reference numerals are as follows:

[0039] Generator set 11, heat recovery coke oven 21, coke oven waste heat boiler 22, first high-temperature flue gas dust collector 23, first valve 24, second valve 25, secondary combustion chamber 26, first flue gas desulfurization and denitrification device 27, first induced draft fan 28, chimney 29, fuel combustion chamber 31, fuel waste heat boiler 32, second high-temperature flue gas dust collector 33, fourth valve 34, second flue gas desulfurization and denitrification device 35, second induced draft fan 36, third valve 41, high-temperature chimney 42, combustion-supporting gas supply system 50, desalted water supply system 60. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field based on this application are within the scope of protection of the present invention.

[0041] The main purpose of this embodiment is to provide a heat recovery system for high-temperature flue gas from a heat recovery coke oven, so that the heat recovery system for high-temperature flue gas from a heat recovery coke oven can provide stable power generation and reduce the impact on the power grid.

[0042] To this end, the present application proposes a heat recovery system for high-temperature flue gas from a heat recovery coke oven.

[0043] The heat recovery system for high-temperature flue gas from a coke oven provided in this application not only includes a heat recovery system that provides steam for the power generation system but also a fuel combustion system that provides controllable steam. When the amount of high-temperature flue gas from the coke oven is insufficient, the fuel combustion system replenishes steam to meet the power generation system's needs. When the amount of high-temperature flue gas from the coke oven is excessive, the fuel combustion system reduces steam to meet the power generation system's needs.

[0044] Figure 1 This is a schematic diagram of the heat recovery system for high-temperature flue gas from a heat recovery coke oven according to an embodiment of the present application. Figure 1 As shown, the heat recovery system for high-temperature flue gas from a heat recovery coke oven includes: a power generation system, a heat recovery coke oven system, a fuel combustion system and a high-temperature flue gas dissipation system.

[0045] The power generation system includes a generator set 11; the heat recovery coke oven system includes a heat recovery coke oven 21 and a coke oven waste heat boiler 22, the high-temperature flue gas generated by the heat recovery coke oven 21 provides heat for the coke oven waste heat boiler 22, so that the coke oven waste heat boiler 22 generates a first steam to generate electricity for the generator set 11; the fuel combustion system includes a fuel combustion chamber 31 and a fuel waste heat boiler 32, the fuel combustion chamber 31 has a fuel regulator, and the fuel combustion chamber 31 is controlled by the fuel regulator to provide controllable heat for the fuel waste heat boiler 32, so that the fuel waste heat boiler 32 generates a controllable second steam to generate electricity for the generator set 11; the high-temperature flue gas dissipation system is used to discharge high-temperature flue gas from the heat recovery coke oven 21.

[0046] The high-temperature flue gas generated by the heat recovery coke oven 21 can be directly generated by burning raw coal gas produced during the coking process. Specifically, the high-temperature flue gas generated by the direct combustion of raw coal gas first provides the heat required for heating the heat recovery coke oven 21 itself, and the remaining heat is used to heat the coke oven waste heat boiler 22.

[0047] The embodiment of the present invention provides a heat recovery system for high-temperature flue gas from a heat recovery coke oven 21, which includes a power generation system, a heat recovery coke oven system, a fuel combustion system, and a high-temperature flue gas dissipation system. The heat recovery coke oven system includes a heat recovery coke oven 21 and a coke oven waste heat boiler 22. The high-temperature flue gas generated by the heat recovery coke oven 21 provides heat to the coke oven waste heat boiler 22, so that the coke oven waste heat boiler 22 generates a first steam to generate electricity for the generator set 11; the fuel combustion system includes a fuel combustion chamber 31 and a fuel waste heat boiler 32. The fuel combustion chamber 31 has a fuel regulator. The fuel combustion chamber 31 is controlled by the fuel regulator to provide controllable heat to the fuel waste heat boiler 32, so that the fuel waste heat boiler 32 generates a controllable second steam to generate electricity for the generator set 11. The generator set 11 generates electricity; in the embodiment of the present application, when the high-temperature flue gas generated by the heat recovery coke oven 21 is unstable and the first steam amount generated by the coke oven waste heat boiler 22 is unstable, the fuel regulator of the fuel combustion chamber 31 can be adjusted to control the fuel combustion chamber 31 to provide controllable heat to the fuel waste heat boiler 32, and the fuel waste heat boiler 32 generates a controllable second steam amount to complement the fluctuating first steam amount, thereby providing a relatively stable total steam amount for the generator set 11, so that the generator set 11 can output a relatively stable amount of power generation and reduce the impact on the power grid.

[0048] In this embodiment, the amount and temperature of high-temperature flue gas generated by heat recovery coke oven 21 are primarily caused by variations in the volatile matter of the coking coal and the coking time. Under normal operation, assuming the coke oven waste heat boiler 22 operates at rated conditions, the amount of first steam generated per unit time T is Q1, and the amount of second steam generated by the fuel waste heat boiler 32 operates at rated conditions is Q2. The amount of steam output by the heat recovery coke oven system and the fuel combustion system to the steam turbine of generator set 11 for power generation is Q. Q = f1*Q1 + f2*Q2, where f1 is the coefficient of variation of the steam output of the coke oven waste heat boiler 22, f1 = 1-0.7, and f2 is the coefficient of variation of the steam output of the fuel waste heat boiler 32, f2 = 1-0.4. If the coke oven waste heat boiler 22 fails, f1 = 0 and f2 = 1, and the steam output provided by Q2 is sufficient for stable power generation.

[0049] According to calculations, the online power generation can be configured based on the steam volume of 1.6*Q1 for the steam turbine unit. Within unit time T, the Q required by the steam turbine unit is Q=Q1+0.4Q2, which is mainly provided by the coke oven waste heat boiler 22 and supplemented by the fuel waste heat boiler 32. The rated load of the fuel waste heat boiler Q2 is 1.4*Q1, that is, Q2=1.4*Q1. When the heat recovery coke oven 21 is operating normally, the fuel waste heat boiler 32 produces steam at the rated load of Q2*40%, and the power generation can be stably output, and the online power deviation is within the range allowed by the trading rules.

[0050] In some embodiments, the heat recovery coke oven system further includes a first high-temperature flue gas dust collector 23, a first valve 24, and a second valve 25. The inlet of the first high-temperature flue gas dust collector 23 is connected to the flue gas outlet of the heat recovery coke oven 21, and the outlet of the first high-temperature flue gas dust collector 23 is connected to the coke oven waste heat boiler 22 and the first flue gas outlet of the fuel combustion chamber 31, respectively, so that the high-temperature flue gas generated by the heat recovery coke oven 21 can provide heat to the coke oven waste heat boiler 22 and the fuel combustion chamber 31, respectively. The first valve 24 is disposed between the first high-temperature flue gas dust collector 23 and the coke oven waste heat boiler 22 and is used to connect or disconnect the high-temperature flue gas generated by the heat recovery coke oven 21 from providing heat to the coke oven waste heat boiler 22. The second valve 25 is disposed between the first high-temperature flue gas dust collector 23 and the first flue gas outlet of the fuel combustion chamber 31 and is used to connect or disconnect the high-temperature flue gas generated by the heat recovery coke oven 21 from providing heat to the fuel combustion chamber 31. By opening and closing the first valve 24, the high-temperature flue gas can be connected or disconnected from the coke oven waste heat boiler 22. By switching the second valve 25 , the high-temperature flue gas can be connected or blocked from flowing into the fuel combustion chamber 31 .

[0051] The first high-temperature flue gas dust collector 23 can use gravity dust removal or cyclone dust removal technology to remove dust from the high-temperature flue gas generated by the heat recovery coke oven 21.

[0052] When the heat recovery coke oven 21 is in a low-load state and the high-temperature flue gas produced is insufficient, the first valve 24 is opened and the second valve 25 is closed. The fuel regulator can be controlled to increase the fuel provided to the fuel combustion chamber 31 and increase the heat provided to the fuel waste heat boiler 32. The high-temperature flue gas generated by the fuel combustion chamber 31 exchanges heat with the fuel waste heat boiler 32, and the second water vapor generated by the heat exchange of the fuel waste heat boiler 32 enters the water vapor main pipe to supplement the water vapor required for full load of the generator set 11.

[0053] When the heat recovery coke oven 21 is in an overproduction state and the high-temperature flue gas generated is in excess, the first valve 24 is opened and the second valve 25 is opened. The fuel regulator can be controlled to reduce the fuel provided to the fuel combustion chamber 31 and the heat provided to the fuel waste heat boiler 32. The high-temperature flue gas generated by the fuel combustion chamber 31 merges with the high-temperature flue gas generated by the heat recovery coke oven 21 and exchanges heat with the fuel waste heat boiler 32. The second water vapor generated by the heat exchange of the fuel waste heat boiler 32 enters the water vapor main pipe to balance the water vapor required for the full load of the generator set 11.

[0054] In addition, since the boiler system has a higher failure rate than the generator set 11, especially when the coke oven waste heat boiler 22 has a fault such as a pipe burst, the fault must be handled by shutting down the coke oven waste heat boiler 22. In the prior art, there is only one coke oven waste heat boiler 22, and the high-temperature flue gas generated by the heat recovery coke oven 21 needs to be released, which requires the generator set 11 to be shut down. However, in this solution, two boilers (the coke oven waste heat boiler 22 and the fuel waste heat boiler 32) are installed. When the coke oven waste heat boiler 22 has a fault such as a pipe burst, the first valve 24 can be closed and the second valve 25 can be opened to direct the high-temperature flue gas from the heat recovery coke oven 21 into the fuel waste heat boiler 32, maintaining the operation of the generator set 11 system.

[0055] In some embodiments, the high-temperature flue gas dissipation system includes a third valve 41 and a high-temperature chimney 42. The high-temperature chimney 42 is connected to the outlet of the first high-temperature flue gas dust collector 23. The third valve 41 is disposed between the high-temperature chimney 42 and the outlet of the first high-temperature flue gas dust collector 23 to discharge high-temperature flue gas from the heat recovery coke oven 21. When the heat recovery coke oven 21 generates excessive high-temperature flue gas, the third valve 41 can be opened to discharge the excess flue gas through the high-temperature chimney 42.

[0056] In some embodiments, the second valve 25 may be a bidirectional valve. When the second valve 25 and the third valve 41 are opened at the same time, the flue gas burned in the fuel combustion chamber 31 may also be discharged to the outside through the high-temperature chimney 42 .

[0057] In some embodiments, the fuel combustion system also includes: a second high-temperature flue gas dust collector 33 and a fourth valve 34; the inlet of the second high-temperature flue gas dust collector 33 is connected to the second flue gas port of the fuel combustion chamber 31 and the fuel waste heat boiler 32, so that the high-temperature flue gas generated by the fuel combustion chamber 31 can provide heat for the fuel waste heat boiler 32; the fourth valve 34 is arranged between the inlet of the second high-temperature flue gas dust collector 33 and the second flue gas port of the fuel combustion chamber 31, and is used to turn on and off the high-temperature flue gas generated by the fuel combustion chamber 31 to supply the fuel waste heat boiler 32.

[0058] The second high-temperature flue gas dust collector 33 can use gravity dust removal or cyclone dust removal technology to remove dust from the high-temperature flue gas generated by the fuel combustion chamber 31.

[0059] When the heat recovery coke oven 21 is underloaded or in overproduction, the fourth valve 34 can be kept open. If the fuel waste heat boiler 32 requires maintenance, the fourth valve 34 is closed, and the second valve 25 and third valve 41 are opened, allowing the high-temperature flue gas from the fuel combustion chamber 31 to be discharged through the high-temperature chimney 42.

[0060] In some embodiments, the high-temperature flue gas heat recovery system of the heat recovery coke oven 21 further includes: a combustion-supporting gas supply system 50 , which provides combustion-supporting gas to the heat recovery coke oven 21 and the fuel combustion chamber 31 .

[0061] In practice, the raw coal gas produced in the carbonization chamber does not need to be completely burned in the combustion chamber to meet the heat required for coking, so a certain amount of combustible gas remains in the high-temperature flue gas discharged from the combustion chamber.

[0062] Furthermore, since the heat recovery coke oven 21 heats itself by burning its own raw coal gas to generate high-temperature flue gas, the temperature of the high-temperature flue gas is primarily controlled by adjusting the amount of combustion-supporting air. This high-temperature flue gas temperature significantly influences the coking time and flue gas composition. Table 1 shows the composition of the high-temperature flue gas at the bottom of the combustion chamber under different coking time conditions.

[0063] Table 1 High temperature flue gas composition

[0064] Coking time <![CDATA[H2(%)]]> <![CDATA[O2(%)]]> <![CDATA[N2(%)]]> <![CDATA[CH4(%)]]> CO (%) <![CDATA[CO2(%)]]> <![CDATA[H2O(%)]]> 28 hours 4.4 0.1 65.2 0.2 3.1 3.6 23.4 21 hours 2.89 0.29 65.98 0.9 3.27 8.04 18.6

[0065] As can be seen from the data in Table 1, the hydrogen content in the high-temperature flue gas is relatively high, and tends to increase as the coking time increases. When the coking time is long, the hydrogen content is too high, which can easily lead to safety hazards. To this end, the combustible gas in the high-temperature flue gas can be burned out before entering the coke oven waste heat boiler 22. In some embodiments, the heat recovery coke oven system further includes: a secondary combustion chamber 26, which is arranged between the high-temperature flue gas outlet of the heat recovery coke oven 21 and the inlet of the first high-temperature flue gas dust collector 23, and is used for secondary combustion of the high-temperature flue gas generated by the heat recovery coke oven 21, thereby improving the heat recovery efficiency of the high-temperature flue gas of the heat recovery coke oven.

[0066] In some embodiments, the combustion-supporting gas supply system 50 also provides combustion-supporting gas to the secondary combustion chamber 26. By adjusting the amount of gas supplied to the secondary combustion chamber 26, the combustible gas is burned out while increasing the amount of heat recovered from waste heat.

[0067] In some embodiments, the heat recovery coke oven system further includes: a first flue gas desulfurization and denitrification device 27, a first induced draft fan 28, and a chimney 29; the first flue gas desulfurization and denitrification device 27 is connected to the exhaust port of the coke oven waste heat boiler 22 and the chimney 29, respectively, and the first induced draft fan 28 is disposed between the exhaust port of the first flue gas desulfurization and denitrification device 27 and the chimney 29. The first flue gas desulfurization and denitrification device 27 can utilize dry or semi-dry desulfurization and denitrification technology to desulfurize and denitrify the flue gas discharged from the coke oven waste heat boiler 22. The first induced draft fan 28 is a wear-resistant fan to increase its service life.

[0068] In some embodiments, the fuel combustion system further includes a second flue gas desulfurization and denitrification device 35 and a second induced draft fan 36. The second flue gas desulfurization and denitrification device 35 is connected to the exhaust port of the fuel waste heat boiler 32 and the chimney 29, respectively, and the second induced draft fan 36 is disposed between the exhaust port of the second flue gas desulfurization and denitrification device 35 and the chimney 29. The second flue gas desulfurization and denitrification device 35 can utilize dry or semi-dry desulfurization and denitrification technology to desulfurize and denitrify the flue gas discharged from the fuel waste heat boiler 32. The second induced draft fan 36 is a wear-resistant fan to increase its service life.

[0069] In some embodiments, the heat recovery system for high-temperature flue gas from the heat recovery coke oven 21 further includes: a desalted water supply system 60 for providing desalted water to the coke oven waste heat boiler 22 and the fuel waste heat boiler 32 .

[0070] This embodiment of the solution utilizes a fuel combustion chamber 31 and a fuel waste heat boiler 32 adjacent to the coke oven waste heat boiler 22. The fuel combustion chamber 31 is connected to the coke oven waste heat boiler 22 and the fuel waste heat boiler 32 via valves, respectively, and is connected to the high-temperature flue gas pipeline. This solution allows fuel combustion in the fuel combustion chamber 31 to generate high-temperature flue gas that is supplied to the fuel waste heat boiler 32. The fuel waste heat can also be recovered from the high-temperature flue gas of the coke oven 21.

[0071] When the high-temperature flue gas from the heat recovery coke oven 21 is insufficient, fuel combustion in the fuel combustion chamber 31 supplements heat, providing sufficient water vapor for the generator set 11 to meet its needs. When the high-temperature flue gas from the heat recovery coke oven 21 is excessive, fuel combustion is reduced and the high-temperature flue gas from the heat recovery coke oven 21 is introduced into the fuel waste heat boiler 32 to stabilize the water vapor supply to the generator set 11 and meet its needs.

[0072] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0073] Each embodiment in this specification is described in a related manner. The same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are included in the scope of protection of the present invention.

Claims

1. A heat recovery system for high-temperature flue gas from a coke oven, characterized in that: include: A power generation system, comprising a generator set (11); A heat recovery coke oven system comprises a heat recovery coke oven (21) and a coke oven waste heat boiler (22), wherein the high-temperature flue gas generated by the heat recovery coke oven (21) provides heat to the coke oven waste heat boiler (22), so that the coke oven waste heat boiler (22) generates first steam to generate electricity for the generator set (11); A fuel combustion system comprises a fuel combustion chamber (31) and a fuel waste heat boiler (32), wherein the fuel combustion chamber (31) has a fuel regulator, and the fuel combustion chamber (31) is controlled by the fuel regulator to provide controllable heat to the fuel waste heat boiler (32), so that the fuel waste heat boiler (32) generates controllable second steam to generate electricity for the generator set (11); A high-temperature flue gas dispersing system is used to discharge high-temperature flue gas from the heat recovery coke oven (21).

2. The heat recovery system for high-temperature flue gas from a heat recovery coke oven according to claim 1, characterized in that: The heat recovery coke oven system further includes a first high-temperature flue gas dust collector (23), a first valve (24) and a second valve (25); The inlet of the first high-temperature flue gas dust collector (23) is connected to the flue gas outlet of the heat recovery coke oven (21), and the outlet of the first high-temperature flue gas dust collector (23) is respectively connected to the first flue gas outlets of the coke oven waste heat boiler (22) and the fuel combustion chamber (31), so that the high-temperature flue gas generated by the heat recovery coke oven (21) can provide heat to the coke oven waste heat boiler (22) and the fuel combustion chamber (31); The first valve (24) is provided between the first high-temperature flue gas dust collector (23) and the coke oven waste heat boiler (22), and is used to switch on and off the high-temperature flue gas generated by the heat recovery coke oven (21) for supplying heat to the coke oven waste heat boiler (22); The second valve (25) is arranged between the first high-temperature flue gas dust collector (23) and the first flue gas outlet of the fuel combustion chamber (31), and is used to switch on and off the high-temperature flue gas generated by the heat recovery coke oven (21) to supply heat to the fuel combustion chamber (31).

3. The heat recovery system for high-temperature flue gas from a heat recovery coke oven according to claim 2, characterized in that: The high-temperature flue gas dispersing system comprises: a third valve (41) and a high-temperature chimney (42); The high-temperature chimney (42) is connected to the outlet of the first high-temperature flue gas dust collector (23), and the third valve (41) is arranged between the high-temperature chimney (42) and the outlet of the first high-temperature flue gas dust collector (23) to discharge high-temperature flue gas for the heat recovery coke oven (21).

4. The heat recovery system for high-temperature flue gas from a heat recovery coke oven according to claim 3, characterized in that: The fuel combustion system further includes: a second high-temperature flue gas dust collector (33) and a fourth valve (34); The inlet of the second high-temperature flue gas dust collector (33) is connected to the second flue gas outlet of the fuel combustion chamber (31) and the fuel waste heat boiler (32), so that the high-temperature flue gas generated by the fuel combustion chamber (31) provides heat for the fuel waste heat boiler (32); The fourth valve (34) is arranged between the inlet of the second high-temperature flue gas dust collector (33) and the second flue gas outlet of the fuel combustion chamber (31), and is used to switch on and off the high-temperature flue gas generated by the fuel combustion chamber (31) to supply the fuel waste heat boiler (32).

5. The heat recovery system for high-temperature flue gas from a heat recovery coke oven according to claim 2, characterized in that: Also includes: The combustion-supporting gas supply system (50) provides combustion-supporting gas to the heat recovery coke oven (21) and the fuel combustion chamber (31).

6. The heat recovery system for high-temperature flue gas from a heat recovery coke oven according to claim 5, characterized in that: The heat recovery coke oven system further comprises: a secondary combustion chamber (26), which is arranged between the high-temperature flue gas outlet of the heat recovery coke oven (21) and the inlet of the first high-temperature flue gas dust collector (23) and is used for secondary combustion of the high-temperature flue gas generated by the heat recovery coke oven (21).

7. The heat recovery system for high-temperature flue gas from a heat recovery coke oven according to claim 6, characterized in that: The combustion-supporting gas supply system (50) also provides combustion-supporting gas to the secondary combustion chamber (26).

8. The heat recovery system for high-temperature flue gas from a heat recovery coke oven according to claim 1, characterized in that: The heat recovery coke oven system further comprises: a first flue gas desulfurization and denitrification device (27), a first induced draft fan (28) and a chimney (29); The first flue gas desulfurization and denitrification device (27) is respectively connected to the exhaust port of the coke oven waste heat boiler (22) and the chimney (29), and the first induced draft fan (28) is arranged between the exhaust port of the first flue gas desulfurization and denitrification device (27) and the chimney (29).

9. The heat recovery system for high-temperature flue gas from a heat recovery coke oven according to claim 8, characterized in that: The fuel combustion system further includes: a second flue gas desulfurization and denitrification device (35) and a second induced draft fan (36); The second flue gas desulfurization and denitrification device (35) is respectively connected to the exhaust port of the fuel waste heat boiler (32) and the chimney (29), and the second induced draft fan (36) is arranged between the exhaust port of the second flue gas desulfurization and denitrification device (35) and the chimney (29).

10. The heat recovery system for high-temperature flue gas from a heat recovery coke oven according to claim 1, characterized in that: Also includes: The desalted water supply system (60) provides desalted water to the coke oven waste heat boiler (22) and the fuel waste heat boiler (32).

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