A steam venting and recovery system for a built-in sintering flue waste heat boiler

Abstract

This invention relates to a steam venting and recovery system for a built-in sintering flue waste heat boiler, comprising a built-in flue waste heat boiler, a built-in flue waste heat boiler steam drum, a steam-organic working fluid Rankine cycle power generation device, a condensate tank, a condensate pump, and electric valves #1, #2, #3, and #4. The venting pipeline is equipped with electric valve #1, and a steam branch pipeline is connected to the venting pipeline after electric valve #1. Electric valve #2 and the steam-organic working fluid Rankine cycle power generation device are sequentially installed on the steam branch pipeline. The condensate outlet of the steam-organic working fluid Rankine cycle power generation device is connected to the condensate tank, and the condensate tank is connected to the boiler feedwater header via the condensate pump. The beneficial effects of this invention are: effectively avoiding steam venting losses, saving system water consumption, reducing noise and environmental pollution, and generating considerable economic benefits from the generated electricity.

Description

Technical Field

[0001] This invention relates to the field of steam venting and recovery technology for built-in sintering flue waste heat boilers, and particularly to a steam venting and recovery system for built-in sintering flue waste heat boilers. Background Technology

[0002] Built-in sintering flue waste heat boilers are widely used due to their high heat exchange efficiency, small footprint, and lack of need for separate ash removal devices. These boilers are typically constructed along with the main sintering production line. However, the steam produced in the sintering flue is often sent to the waste heat utilization system and for production steam use. The construction of the flue waste heat system usually lags behind the main sintering production line by one to two months or more. After the steam is put into operation, there is nowhere to transport it, so it can only be vented.

[0003] If the built-in sintering flue waste heat boiler is kept dry without water supply when the main sintering line is completed but the flue waste heat system is not, it will cause equipment damage. If boiler feedwater is introduced, the steam venting will consume a huge amount of water. For example, if a 10t / h boiler vents for two months, the water consumption can reach 14,400t, which will cause huge waste. Especially when the system water source is demineralized water, the demineralized water system needs to be run continuously, which is even more expensive. After the flue waste heat system is put into operation, due to the unstable operation of the waste heat system and the production steam system, frequent start-ups and shutdowns, the steam venting produced by the built-in sintering flue waste heat boiler will also occur frequently. Moreover, the steam venting process will generate a lot of noise and a large amount of exhaust steam, which will have a huge impact on the environment. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, this invention provides a steam venting and recovery system for a built-in sintering flue waste heat boiler. This system utilizes a branch steam pipe installed in the venting pipeline, with a Rankine cycle power generation device using steam as the organic working fluid. The condensate generated after power generation is pumped into the boiler feedwater header via a condensate pump and then recycled back into the built-in sintering flue waste heat boiler. This effectively avoids steam venting losses when the boiler cannot be connected to the grid, saves system water consumption, reduces noise and environmental pollution, and generates considerable economic benefits from the electricity produced.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] A steam venting and recovery system for a built-in sintering flue waste heat boiler includes a built-in sintering flue waste heat boiler, a built-in sintering flue waste heat boiler steam drum, a steam-organic working fluid Rankine cycle power generation device, a condensate tank, a condensate pump, and electric valves #1, #2, #3, and #4. The built-in sintering flue waste heat boiler is connected to the built-in sintering flue waste heat boiler steam drum. The outlet of the built-in sintering flue waste heat boiler steam drum is connected to a venting pipe and an external steam pipeline. The venting pipe is equipped with electric valve #1. A steam branch pipe is set up after electric valve #1. Electric valve #2 and the steam-organic working fluid Rankine cycle power generation device are sequentially installed on the steam branch pipe. The condensate outlet of the steam-organic working fluid Rankine cycle power generation device is connected to the condensate tank. The condensate tank is connected to the boiler feedwater header via the condensate pump. Electric valve #3 is installed on the external steam pipeline.

[0007] Furthermore, the built-in sintering flue waste heat boiler is installed inside the flue.

[0008] Furthermore, the venting pipe is equipped with a No. 4 electric valve after the steam branch pipe.

[0009] Furthermore, the steam venting and recovery method of the built-in sintering flue waste heat boiler steam venting and recovery system includes the following:

[0010] S1. In the initial stage of operation of the waste heat system of the main flue and when the external steam cannot be successfully connected to the grid, close the No. 3 electric valve and the No. 4 electric valve, and open the No. 1 electric valve and the No. 2 electric valve to send the steam released from the boiler of the main flue to the steam organic working fluid Rankine cycle power generation unit in the steam branch pipeline, and use the released steam to generate electricity. The generated electricity can be used for the plant area’s own use or connected to the grid.

[0011] S2. After the released steam is heat-exchanged by the Rankine cycle power generation unit with organic working fluid, it is condensed into water. The condensate enters the condensate tank from the condensate outlet of the Rankine cycle power generation unit with organic working fluid. The condensate in the condensate tank is pumped into the boiler feed water header by the condensate pump. After entering the boiler feed water header, the condensate enters the steam drum of the built-in sintering flue waste heat boiler and the built-in sintering flue waste heat boiler for recycling again.

[0012] S3. After the main flue waste heat system is put into normal operation, close electric valves 1 and 4, the vent pipe is closed, close electric valve 2, the steam branch pipe is closed, and the steam power generation is shut down; open electric valve 3, so that the steam generated by the built-in sintering main flue waste heat boiler enters the external steam pipeline through electric valve 3 and is sent into the main flue waste heat system.

[0013] S4. In the initial stage of operation of the large flue waste heat system and when the external steam cannot be successfully connected to the grid and the organic working fluid Rankine cycle power generation unit cannot work normally, close the No. 2 electric valve and the No. 3 electric valve, close the external steam pipeline and the steam branch pipeline, open the No. 1 electric valve and the No. 4 electric valve, and the steam generated by the built-in sintering large flue waste heat boiler is released temporarily through the venting pipeline.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1) When the waste heat steam from the main flue cannot be connected to the grid, steam is used to generate electricity through steam branch pipes. The condensate from the steam generated by the steam power generation is then recycled back into the built-in sintering main flue waste heat boiler. This effectively avoids the steam loss caused by the inability of the main flue boiler to be connected to the grid. The condensate is reused, the steam is recycled, the steam utilization rate is improved, the system water consumption is saved, resource consumption is reduced, the amount of steam released is reduced, noise and environmental pollution are reduced, and the generated electricity can generate considerable economic benefits and improve the value of steam utilization.

[0016] 2) Short-term venting through the venting pipeline alleviates the instability of steam grid connection during the initial stage of the large flue waste heat system or when the organic working fluid Rankine cycle power generation unit cannot be used normally, prevents damage to the large flue waste heat system and venting system, improves the utilization rate of the large flue waste heat system and venting system, and improves the steam venting effect. Attached Figure Description

[0017] Figure 1 This is a flow chart of a steam venting and recovery system for a built-in sintering flue waste heat boiler as described in this invention.

[0018] In the diagram: 1. Built-in sintering flue waste heat boiler; 2. Built-in sintering flue waste heat boiler steam drum; 3. Steam-organic working fluid Rankine cycle power generation unit; 4. Condensate tank; 5. Condensate pump; 6. Electric valve #1; 7. Electric valve #2; 8. Electric valve #3; 9. Electric valve #4; 10. Vent pipe; 11. Steam branch pipe; 12. Boiler feedwater main pipe; 13. External steam pipeline. Detailed Implementation

[0019] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0020] like Figure 1As shown, the working principle of a steam venting and recovery system for a built-in sintering flue waste heat boiler is as follows: A steam branch pipe 11 is installed on the venting pipe 10 of the built-in sintering flue waste heat boiler drum 2. A steam organic working fluid Rankine cycle power generation device 3 is installed on the steam branch pipe 11. When the steam generated by the built-in sintering flue waste heat boiler 1 cannot be connected to the grid, the steam flows through the steam branch pipe 11 and the steam organic working fluid Rankine cycle power generation device 3 to generate electricity. The condensate generated by the steam power generation is connected to the boiler feedwater header 12 through the condensate tank 4 and the condensate pump 5. The boiler feedwater header is connected to the built-in sintering flue waste heat boiler 1 through the built-in sintering flue waste heat boiler drum 2. The condensate generated by the steam... Steam is recycled and reused, saving resources, reducing energy consumption, saving water resources, improving steam utilization rate, reducing steam emissions, reducing noise and environmental pollution, and generating considerable economic benefits from the electricity produced. The built-in sintered flue waste heat boiler drum 2 is equipped with a venting pipe 10. In the event of unstable operation of the organic working fluid Rankine cycle power generation device 3 or the flue waste heat system, the venting pipe 10 can vent for a short period of time, preventing poor steam discharge from impacting the venting system or the flue waste heat system, preventing damage to the venting system and the flue waste heat system from steam impact, extending the service life of the venting system and the flue waste heat system, improving utilization rate, and improving steam venting effect.

[0021] like Figure 1 As shown, a steam venting and recovery system for a built-in sintering flue waste heat boiler includes a built-in sintering flue waste heat boiler 1, a built-in sintering flue waste heat boiler steam drum 2, a steam-organic working fluid Rankine cycle power generation unit 3, a condensate tank 4, a condensate pump 5, electric valve #1 6, electric valve #2 7, electric valve #3 8, and electric valve #4 9. The built-in sintering flue waste heat boiler 1 is connected to the built-in sintering flue waste heat boiler steam drum 2, and the outlet of the built-in sintering flue waste heat boiler steam drum 2 is connected to... The system connects to a vent pipe 10 and an external steam pipe 13. The vent pipe 10 is equipped with a #1 electric valve 6. A steam branch pipe 11 is installed on the vent pipe 10 after the #1 electric valve 6. A #2 electric valve 7 and a steam-organic working fluid Rankine cycle power generation device 3 are installed sequentially on the steam branch pipe 11. The condensate outlet of the steam-organic working fluid Rankine cycle power generation device 3 is connected to a condensate tank 4. The condensate tank 4 is connected to the boiler feedwater header 12 through a condensate pump 5. A #3 electric valve 8 is installed on the external steam pipe 13.

[0022] Furthermore, the built-in sintering flue waste heat boiler 1 is installed inside the flue.

[0023] Furthermore, the vent pipe 10 is equipped with a No. 4 electric valve 9 after the steam branch pipe 11.

[0024] Furthermore, the steam venting and recovery method of the built-in sintering flue waste heat boiler steam venting and recovery system includes the following:

[0025] S1. In the initial stage of operation of the waste heat system of the main flue and when the external steam cannot be successfully connected to the grid, close electric valve 8 of No. 3 and electric valve 9 of No. 4, and open electric valve 6 of No. 1 and electric valve 7 of No. 2, so that the steam released from the boiler of the main flue can be sent to the steam organic working fluid Rankine cycle power generation unit 3 of the steam branch pipeline 11, and the released steam can be used to generate electricity. The generated electricity can be used for the plant’s own use or connected to the grid.

[0026] S2. After the released steam generates electricity through the Rankine cycle power generation unit 3, it condenses into water. The condensate enters the condensate tank 4 from the condensate outlet of the Rankine cycle power generation unit 3. The condensate in the condensate tank 4 is pumped into the boiler feed water header 12 by the condensate pump 5. After entering the boiler feed water header 12, the condensate enters the steam drum 2 of the built-in sintering flue waste heat boiler and the built-in sintering flue waste heat boiler 1 for recycling again.

[0027] S3. After the main flue waste heat system is put into normal operation, close electric valve 6 and electric valve 9, vent pipe 10 is closed, electric valve 7 is closed, steam branch pipe 11 is closed, and steam power generation is shut down; open electric valve 8 to allow the steam generated by the built-in sintering main flue waste heat boiler 1 to enter the external steam pipe 13 through electric valve 8 and be sent to the main flue waste heat system.

[0028] S4. In the initial stage of operation of the flue gas waste heat system and when the external steam cannot be successfully connected to the grid and the organic working fluid Rankine cycle power generation unit 3 cannot work normally, close electric valve 7 and electric valve 8, close the external steam pipeline 13 and steam branch pipeline 11, open electric valve 6 and electric valve 9, and the steam generated by the built-in sintering flue gas waste heat boiler 1 is temporarily released through the venting pipeline 10.

[0029] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A steam venting and recovery system for a built-in sintering flue waste heat boiler, comprising a built-in sintering flue waste heat boiler, a built-in sintering flue waste heat boiler steam drum, a steam-organic working fluid Rankine cycle power generation unit, a condensate tank, a condensate pump, and electric valves #1, #2, #3, and #4, wherein the built-in sintering flue waste heat boiler is connected to the built-in sintering flue waste heat boiler steam drum, characterized in that... The built-in sintering flue waste heat boiler steam drum outlet is connected to a venting pipe and an external steam pipeline. The venting pipe is equipped with a No. 1 electric valve. After the No. 1 electric valve, the venting pipe is connected to a steam branch pipe. The steam branch pipe is sequentially equipped with a No. 2 electric valve and a steam-organic working fluid Rankine cycle power generation device. The condensate outlet of the steam-organic working fluid Rankine cycle power generation device is connected to a condensate tank. The condensate tank is connected to the boiler feedwater header through a condensate pump. The external steam pipeline is equipped with a No. 3 electric valve. The venting pipe is equipped with a No. 4 electric valve after the steam branch pipe.

2. The steam venting and recovery system for a built-in sintering flue waste heat boiler according to claim 1, characterized in that, The built-in sintering flue waste heat boiler is installed inside the flue.

3. The steam venting and recovery method of a built-in sintering flue waste heat boiler according to claim 1, characterized in that, The steam venting and recovery method of the built-in sintering flue waste heat boiler steam venting and recovery system includes the following: S1. In the initial stage of operation of the waste heat system of the main flue and when the external steam cannot be successfully connected to the grid, close the No. 3 electric valve and the No. 4 electric valve, and open the No. 1 electric valve and the No. 2 electric valve to send the steam released from the boiler of the main flue to the steam organic working fluid Rankine cycle power generation unit in the steam branch pipeline, and use the released steam to generate electricity. The generated electricity can be used for the plant area’s own use or connected to the grid. S2. After the released steam is heat-exchanged by the Rankine cycle power generation unit with organic working fluid, it is condensed into water. The condensate enters the condensate tank from the condensate outlet of the Rankine cycle power generation unit with organic working fluid. The condensate in the condensate tank is pumped into the boiler feed water header by the condensate pump. After entering the boiler feed water header, the condensate enters the steam drum of the built-in sintering flue waste heat boiler and the built-in sintering flue waste heat boiler for recycling again. S3. After the main flue waste heat system is put into normal operation, close electric valves 1 and 4, the vent pipe is closed, close electric valve 2, the steam branch pipe is closed, and the steam power generation is shut down; open electric valve 3, so that the steam generated by the built-in sintering main flue waste heat boiler enters the external steam pipeline through electric valve 3 and is sent into the main flue waste heat system. S4. In the initial stage of operation of the large flue waste heat system and when the external steam cannot be successfully connected to the grid and the organic working fluid Rankine cycle power generation unit cannot work normally, close the No. 2 electric valve and the No. 3 electric valve, close the external steam pipeline and the steam branch pipeline, open the No. 1 electric valve and the No. 4 electric valve, and the steam generated by the built-in sintering large flue waste heat boiler is released temporarily through the venting pipeline.

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