Heat recovery type coke oven waste heat flue gas power generation system

Abstract

The utility model provides a heat recovery type coke oven waste heat flue gas power generation system. The heat recovery type coke oven waste heat flue gas power generation system comprises a heat recovery type coke oven, a coke oven waste heat flue gas utilization device, a desulfurization device and a chimney. Wherein the coke oven waste heat flue gas utilization device comprises a coke oven waste heat boiler and a coke oven waste heat flue gas accident discharge chimney; high-temperature flue gas generated in the heat recovery type coke oven and cold water in a main feed water inlet of the waste heat boiler enter the coke oven waste heat boiler to react, and a large amount of high-temperature steam is generated to drive a steam turbine generator unit to generate power. By the adoption of the heat recovery type coke oven waste heat flue gas power generation system, waste heat can be effectively recovered, and waste heat utilization of the heat recovery type coke oven waste heat flue gas is achieved; the pipeline arrangement is simple and reasonable, the heat loss is reduced, materials can be saved, the energy utilization efficiency is improved, the cost is saved, and the economic benefits of coking enterprises are effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of heat recovery type coke oven waste heat flue gas utilization technology, and more specifically, to a heat recovery type coke oven waste heat flue gas power generation system. Background Technology

[0002] Heat recovery coke oven coking is one of the world's three major new coking technologies. The entire system operates under negative pressure, and the raw coal gas produced during coking is directly burned in the furnace. The heat generated from the combustion is used to heat the coal. The waste heat from coking enters the waste heat boiler with the exhaust gas to produce steam. The high-temperature steam produced can be used for power generation. Compared with conventional coke ovens, heat recovery coke oven waste heat flue gas requires a lower initial investment, has a faster payback period, and is more economically efficient.

[0003] Existing heat recovery coke oven waste heat power generation systems typically have the following problems: 1. Each heat recovery coke oven is equipped with a set of coke oven waste heat utilization devices, and the sets are not interconnected. When the coke oven waste heat utilization device malfunctions, the entire system needs to be suspended, affecting the work progress; 2. The pipeline design is unreasonable, increasing the pipeline length, increasing heat loss, resulting in the waste of waste heat resources and reducing energy utilization efficiency. Utility Model Content

[0004] In view of the above problems, the purpose of this utility model is to provide a heat recovery type coke oven waste heat flue gas power generation system, which can avoid the work stoppage caused by the failure of the coke oven waste heat boiler or part of the structure, and ensure the normal operation of the work; moreover, the pipeline design is simple and reasonable, which can reduce heat loss, save materials, improve energy utilization efficiency, and save costs.

[0005] The heat recovery type coke oven waste heat flue gas power generation system provided by this utility model includes a heat recovery type coke oven, a coke oven waste heat flue gas utilization device, a desulfurization device, and a chimney; wherein...

[0006] The coke oven waste heat flue gas utilization device includes a coke oven waste heat boiler and a coke oven waste heat flue gas emergency emission chimney.

[0007] A top gas collecting pipe is provided on the top of the heat recovery type coke oven; the top gas collecting pipe is connected to the bottom side of the coke oven waste heat boiler through a high-temperature flue gas pipe; the coke oven waste heat flue gas emergency emission chimney is located between the top gas collecting pipe and the high-temperature flue gas pipe.

[0008] A waste heat boiler flue gas outlet is provided on the other side of the bottom of the coke oven waste heat boiler; a waste heat boiler main feed water inlet is provided on the side wall of the coke oven waste heat boiler; and a waste heat boiler steam outlet is provided on the top of the coke oven waste heat boiler.

[0009] The inlet of the desulfurization device is connected to the flue gas outlet of the waste heat boiler via a flue gas discharge pipe; the outlet of the desulfurization device is connected to the chimney.

[0010] Furthermore, in a preferred configuration, at least two sets of the coke oven waste heat and flue gas utilization devices are provided, and the coke oven waste heat and flue gas utilization devices are connected in parallel.

[0011] Furthermore, a preferred structure is that the coke oven waste heat boiler has an n-shaped structure.

[0012] Furthermore, a preferred configuration is that an electric valve for the waste heat boiler flue gas inlet is provided at the end of the high-temperature flue gas pipe near the coke oven waste heat boiler; and an electric valve for the waste heat boiler flue gas outlet is provided at the end of the flue gas discharge pipe near the coke oven waste heat boiler.

[0013] Furthermore, in a preferred configuration, the main feedwater inlet of the waste heat boiler is connected to the main feedwater inlet pipe of the waste heat boiler, and an electric valve for the main feedwater inlet of the waste heat boiler is installed on the main feedwater inlet pipe of the waste heat boiler; the steam outlet of the waste heat boiler is connected to the steam outlet pipe of the waste heat boiler, and an electric valve for the steam outlet of the waste heat boiler is installed on the steam outlet pipe of the waste heat boiler.

[0014] In addition, a preferred structure includes a steam turbine generator set, which generates electricity through high-temperature and high-pressure steam output from the waste heat boiler steam outlet pipe.

[0015] Furthermore, a preferred configuration is to install an electric valve for emergency discharge of waste heat flue gas on the coke oven waste heat flue gas emergency discharge chimney.

[0016] Furthermore, a preferred configuration is that an induced draft fan is provided at the inlet end of the desulfurization unit, and a booster fan is provided at the outlet end of the desulfurization unit.

[0017] Furthermore, a preferred configuration is that the temperature of the high-temperature flue gas in the gas collecting pipe at the top of the furnace is 1050–1150°C.

[0018] Furthermore, a preferred configuration is that the temperature of the low-temperature flue gas in the flue gas discharge pipe is 165–180°C.

[0019] As can be seen from the above description, the heat recovery type coke oven waste heat flue gas power generation system provided by this utility model avoids the impact on the working process of the power generation system due to the failure of any waste heat boiler or part of the structure, and ensures normal operation; it effectively recovers waste heat and realizes the utilization of waste heat from the heat recovery type coke oven waste heat flue gas; the pipeline layout is simple and reasonable, which reduces heat loss while saving materials, improving energy utilization efficiency, saving costs, and effectively improving the economic benefits of coking enterprises. Attached Figure Description

[0020] Other objects and results of this invention will become more apparent and readily understood with reference to the following description taken in conjunction with the accompanying drawings and the contents of the claims, and with a more complete understanding of this invention.

[0021] In the attached diagram:

[0022] Figure 1 This is a schematic diagram of the overall structure of a heat recovery type coke oven waste heat flue gas power generation system according to an embodiment of the present utility model.

[0023] In the diagram, 1-Heat recovery type coke oven; 101-Oven top gas collecting pipe; 2-Desulfurization device; 3-Chimney; 4-Coke oven waste heat boiler; 5-Coke oven waste heat flue gas emergency emission chimney; 6-High temperature flue gas pipe; 7-Waste heat boiler flue gas outlet; 8-Waste heat boiler main feedwater inlet; 9-Waste heat boiler steam outlet; 10-Flue gas discharge pipe; 11-Induced draft fan; 12-Booster fan; 13-Waste heat boiler flue gas inlet electric valve; 14-Waste heat boiler flue gas outlet electric valve; 15-Waste heat boiler main feedwater inlet pipe; 16-Waste heat boiler main feedwater inlet electric valve; 17-Waste heat boiler steam outlet pipe; 18-Waste heat boiler steam outlet electric valve; 19-Waste heat flue gas emergency emission electric valve.

[0024] In all the accompanying drawings, the same reference numerals indicate similar or corresponding features or functions. Detailed Implementation

[0025] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0026] Figure 1 This is a schematic diagram of the overall structure of a heat recovery type coke oven waste heat flue gas power generation system according to an embodiment of the present utility model.

[0027] like Figure 1 As shown, the heat recovery type coke oven waste heat flue gas power generation system provided by this utility model mainly includes a heat recovery type coke oven 1, a coke oven waste heat flue gas utilization device, a desulfurization device 2, and a chimney 3.

[0028] The coke oven waste heat and flue gas utilization device includes a coke oven waste heat boiler 4 and a coke oven waste heat and flue gas emergency emission chimney 5; the heat recovery type coke oven 1, coke oven waste heat boiler 4 and coke oven waste heat and flue gas emergency emission chimney 5 are interconnected by connecting pipes to achieve the purpose of coke oven waste heat and flue gas utilization.

[0029] In one specific embodiment of this utility model, at least two sets of coke oven waste heat flue gas utilization devices are provided, and the coke oven waste heat flue gas utilization devices are connected in parallel, which can effectively cope with system failures and maintenance, and ensure the normal operation of the coke oven waste heat flue gas power generation system.

[0030] In one specific embodiment of this utility model, the coke oven waste heat boiler 4 has an n-shaped structure; the flow path is long and the heating area is large, which allows cold water and high-temperature flue gas to react fully, and it is easy to install and lift.

[0031] A top gas collecting pipe 101 is installed at the top of the heat recovery type coke oven 1 to output the waste heat flue gas inside the heat recovery type coke oven 1; the top gas collecting pipe 101 is connected to one side of the bottom of the coke oven waste heat boiler 4 through a high temperature flue gas pipe 6, and the coke oven waste heat flue gas transported in the top gas collecting pipe 101 is transported to the coke oven waste heat boiler 4 through the high temperature flue gas pipe 6; the coke oven waste heat flue gas emergency emission chimney 5 is set between the top gas collecting pipe 101 and the high temperature flue gas pipe 6. When the coke oven waste heat boiler 4 or other structures malfunction and need to be repaired, the waste heat flue gas is released through the coke oven waste heat flue gas emergency emission chimney 5.

[0032] On the other side of the bottom of the coke oven waste heat boiler 4, there is a waste heat boiler flue gas outlet 7, which can discharge the cooled low-temperature flue gas to the desulfurization device 2 for desulfurization and purification, and then discharge it into the atmosphere through the chimney 3; a waste heat boiler main feed water inlet 8 is provided on the side wall of the coke oven waste heat boiler 4, and a waste heat boiler steam outlet 9 is provided on the top of the coke oven waste heat boiler 4; cold water is input into the coke oven waste heat boiler 4 through the waste heat boiler main feed water inlet 8, and reacts with the high-temperature flue gas in the coke oven waste heat boiler 4 to generate high-temperature and high-pressure steam, which is output through the waste heat boiler steam outlet 9 to drive the steam turbine generator set to generate electricity.

[0033] In one specific embodiment of this utility model, the temperature of the high-temperature flue gas in the furnace top gas collecting pipe 101 is 1050-1150°C; the temperature of the low-temperature flue gas in the flue gas discharge pipe 10 is 165-180°C.

[0034] In one specific embodiment of this utility model, a waste heat boiler flue gas inlet electric valve 13 is provided at the end of the high-temperature flue gas pipe 6 near the coke oven waste heat boiler 4 to control the high-temperature flue gas to enter the coke oven waste heat boiler 4. When the coke oven waste heat boiler 4 malfunctions, the waste heat boiler flue gas inlet electric valve 13 is closed, allowing the high-temperature flue gas to directly enter the matching coke oven waste heat boiler 4 from the high-temperature flue gas pipe 6 of other coke oven waste heat flue gas utilization devices. A waste heat boiler flue gas outlet electric valve 14 is provided at the end of the flue gas discharge pipe 10 near the coke oven waste heat boiler 4 to control the flue gas discharge pipe 10 to discharge the cooled low-temperature flue gas to the desulfurization device 2 for desulfurization and purification before being discharged into the atmosphere through the chimney 3. When the coke oven waste heat boiler 4 or other structures malfunction and need maintenance, the waste heat boiler flue gas outlet electric valve 14 is closed to prevent high-temperature flue gas from entering the malfunctioning or under-maintenance coke oven waste heat boiler 4.

[0035] In one specific embodiment of this utility model, the main feedwater inlet 8 of the waste heat boiler is connected to the main feedwater inlet pipe 15 of the waste heat boiler, which is used to transport cold water to the coke oven waste heat boiler 4; an electric valve 16 for the main feedwater inlet of the waste heat boiler is provided on the main feedwater inlet pipe 15 of the waste heat boiler, which can control the opening and closing state of the main feedwater inlet pipe 15 of the waste heat boiler.

[0036] In one specific embodiment of this utility model, the waste heat boiler steam outlet 9 is connected to the waste heat boiler steam outlet pipe 17, which is used to output high-temperature and high-pressure steam to drive the steam turbine generator set for power generation; a waste heat boiler steam outlet electric valve 18 is provided on the waste heat boiler steam outlet pipe 17, which can control the opening and closing state of the waste heat boiler steam outlet pipe 17; a waste heat flue gas emergency emission electric valve 19 is also provided on the coke oven waste heat flue gas emergency emission chimney 5, which is used to control the opening and closing state of the coke oven waste heat flue gas emergency emission chimney 5 and control the emission of waste heat flue gas.

[0037] The inlet end of the desulfurization device 2 is connected to the flue gas outlet 7 of the waste heat boiler through the flue gas discharge pipe 10. The cooled low-temperature flue gas is discharged to the desulfurization device 2 through the flue gas discharge pipe 10 for desulfurization and purification. The outlet end of the desulfurization device 2 is connected to the chimney 3. The low-temperature flue gas after desulfurization and purification by the desulfurization device 2 is discharged into the atmosphere through the chimney 3.

[0038] An induced draft fan 11 is installed at the inlet end of the desulfurization unit 2. The induced draft fan 11 can draw the low-temperature flue gas cooled in the coke oven waste heat boiler 4 into the desulfurization unit 2 for purification, accelerate gas flow, and improve working efficiency. A booster fan 12 is installed at the outlet end of the desulfurization unit 2. The booster fan 12 is used to overcome the flue gas resistance of the desulfurization unit 2, introduce the low-temperature flue gas into the desulfurization unit 2, and stabilize the outlet pressure of the induced draft fan 11 to ensure the operating performance and reliability of the desulfurization unit 2.

[0039] As can be seen from the above technical solution, the heat recovery type coke oven waste heat flue gas power generation system provided by this utility model avoids the impact on the working process of the power generation system due to the failure of any waste heat boiler or part of the structure, and ensures normal operation; it effectively recovers waste heat and realizes the utilization of waste heat from the heat recovery type coke oven waste heat flue gas; the pipeline layout is simple and reasonable, which reduces heat loss while saving materials, improving energy utilization efficiency, saving costs, and effectively improving the economic benefits of coking enterprises.

[0040] The heat recovery type coke oven waste heat flue gas power generation system according to the present invention has been described above by way of example with reference to the accompanying drawings. However, those skilled in the art should understand that various modifications can be made to the heat recovery type coke oven waste heat flue gas power generation system proposed in the present invention without departing from the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the contents of the appended claims.

Claims

1. A heat recovery type coke oven waste heat flue gas power generation system, characterized in that, This includes heat recovery coke ovens, coke oven waste heat and flue gas utilization devices, desulfurization devices, and chimneys; among which, The coke oven waste heat flue gas utilization device includes a coke oven waste heat boiler and a coke oven waste heat flue gas emergency emission chimney. A top gas collecting pipe is provided on the top of the heat recovery type coke oven; the top gas collecting pipe is connected to the bottom side of the coke oven waste heat boiler through a high-temperature flue gas pipe; the coke oven waste heat flue gas emergency emission chimney is located between the top gas collecting pipe and the high-temperature flue gas pipe. A waste heat boiler flue gas outlet is provided on the other side of the bottom of the coke oven waste heat boiler; a waste heat boiler main feed water inlet is provided on the side wall of the coke oven waste heat boiler; and a waste heat boiler steam outlet is provided on the top of the coke oven waste heat boiler. The inlet of the desulfurization device is connected to the flue gas outlet of the waste heat boiler via a flue gas discharge pipe; the outlet of the desulfurization device is connected to the chimney.

2. The heat recovery type coke oven waste heat flue gas power generation system as described in claim 1, characterized in that, The coke oven waste heat and flue gas utilization device is provided in at least two sets, and the coke oven waste heat and flue gas utilization devices are connected in parallel.

3. The heat recovery type coke oven waste heat flue gas power generation system as described in claim 1, characterized in that, The coke oven waste heat boiler has an n-shaped structure.

4. The heat recovery type coke oven waste heat flue gas power generation system as described in claim 1, characterized in that, An electric valve for the flue gas inlet of the waste heat boiler is installed at the end of the high-temperature flue gas pipe near the coke oven waste heat boiler; an electric valve for the flue gas outlet of the waste heat boiler is installed at the end of the flue gas discharge pipe near the coke oven waste heat boiler.

5. The heat recovery type coke oven waste heat flue gas power generation system as described in claim 1, characterized in that, The main feedwater inlet of the waste heat boiler is connected to the main feedwater inlet pipe of the waste heat boiler, and an electric valve for the main feedwater inlet of the waste heat boiler is installed on the main feedwater inlet pipe of the waste heat boiler; the steam outlet of the waste heat boiler is connected to the steam outlet pipe of the waste heat boiler, and an electric valve for the steam outlet of the waste heat boiler is installed on the steam outlet pipe of the waste heat boiler.

6. The heat recovery type coke oven waste heat flue gas power generation system as described in claim 5, characterized in that, It also includes a steam turbine generator set, which generates electricity through the high-temperature and high-pressure steam output from the steam outlet pipe of the waste heat boiler.

7. The heat recovery type coke oven waste heat flue gas power generation system as described in claim 1, characterized in that, An electric valve for emergency discharge of waste heat flue gas is installed on the coke oven waste heat flue gas emergency discharge chimney.

8. The heat recovery type coke oven waste heat flue gas power generation system as described in claim 1, characterized in that, An induced draft fan is installed at the inlet end of the desulfurization unit; a booster fan is installed at the outlet end of the desulfurization unit.

9. The heat recovery type coke oven waste heat flue gas power generation system as described in claim 1, characterized in that, The temperature of the high-temperature flue gas in the gas collecting pipe at the top of the furnace is 1050-1150℃.

10. The heat recovery type coke oven waste heat flue gas power generation system as described in claim 1, characterized in that, The temperature of the low-temperature flue gas in the flue gas discharge pipe is 165-180°C.

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