Steam diffusing and recycling system of built-in sintering large flue waste heat boiler

Abstract

The invention relates to a steam diffusing and recycling system of a built-in sintering large flue waste heat boiler, which comprises a built-in large flue waste heat boiler, a built-in large flue waste heat boiler drum, a steam organic working medium Rankine cycle power generation device, a condensation water tank, a condensation water pump, a 1 # electric valve, a 2 # electric valve, a 3 # electric valve and a 4 # electric valve, the diffusion pipeline is provided with a first electric valve, the diffusion pipeline behind the first electric valve is provided with a steam branch pipeline, the steam branch pipeline is sequentially provided with a second electric valve and a steam organic working medium Rankine cycle power generation device, and a condensed water outlet of the steam organic working medium Rankine cycle power generation device is connected with a condensed water tank. The system has the beneficial effects that the steam diffusion loss is effectively avoided, the water consumption of the system is saved, the noise and the environmental pollution are reduced, and the generated electric energy can generate considerable economic benefits.

Description

Technical Field

[0001] The invention relates to the technical field of steam emission and recovery of a built-in large flue waste heat boiler, and in particular to a steam emission and recovery system of a built-in sintering large flue waste heat boiler. Background Art

[0002] Built-in sintering large flue waste heat boiler has the characteristics of high heat exchange efficiency, small footprint, no need for separate ash removal device, etc., and is widely used. Built-in sintering large flue waste heat boiler is usually built together with the sintering main line, and the steam produced by the sintering large flue is often sent to the waste heat utilization system and production steam. The construction time of the large flue waste heat system is usually delayed by more than one to two months compared with the sintering main line. After the steam is put into operation, there is no place to transport it and it can only be released.

[0003] When the sintering main line is built but the large flue waste heat system is not built, if the built-in large flue waste heat boiler is always dry-burning without water, it will cause equipment damage; if boiler feed water is introduced, the steam release consumes a huge amount of water. Calculated based on the release of a 10t / h boiler for two months, the water consumption can reach 14,400t, which will cause huge waste, especially when the system water source is desalted water, the desalted water system needs to be run all the time, which is more expensive; after the large flue waste heat system is put into use, the steam produced by the built-in large flue waste heat boiler is often released due to the unstable operation of the waste heat system and the production steam system, and frequent start and stop; and during the steam release process, a huge noise and a large amount of exhaust steam will be generated, which has a huge impact on the environmental protection. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a steam release and recovery system for a built-in sintering large flue waste heat boiler, which utilizes a steam branch pipe to be set up in the release pipe for diversion, and a steam-organic working medium Rankine cycle power generation device is set up in the steam branch pipe. The condensate generated after power generation is pumped into the boiler water supply main pipe through a condensate pump and enters the built-in large flue waste heat boiler for recycling again, effectively avoiding the steam release loss caused by the steam produced by the large flue boiler cannot be normally connected to the grid, saving system water consumption, reducing noise and environmental pollution, and the generated electricity can generate considerable economic benefits.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A steam release and recovery system for a built-in sintering large flue waste heat boiler comprises a built-in large flue waste heat boiler, a built-in large flue waste heat boiler drum, a steam-organic working fluid Rankine cycle power generation device, a condensate tank, a condensate pump, a 1# electric valve, a 2# electric valve, a 3# electric valve and a 4# electric valve, wherein the built-in large flue waste heat boiler is connected to the built-in large flue waste heat boiler drum, the built-in large flue waste heat boiler drum outlet is connected to a release pipe and an external steam pipe, the release pipe is provided with a 1# electric valve, the release pipe after the 1# electric valve is provided with a steam branch pipe, the steam branch pipe is provided with a 2# electric valve and a steam-organic working fluid Rankine cycle power generation device in sequence, 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 water supply mother pipe through the condensate pump, and the external steam pipe is provided with a 3# electric valve.

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

[0008] Furthermore, the release pipe is provided with a 4# electric valve after the steam branch pipe.

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

[0010] S1. In the initial stage of operation of the flue waste heat system and when the external steam cannot be smoothly connected to the grid, close the 3# electric valve and the 4# electric valve, open the 1# electric valve and the 2# electric valve, so that the steam released by the flue boiler can be sent to the steam organic working fluid Rankine cycle power generation device in the steam branch pipeline, and the released steam can be used to generate electricity. The generated electricity can be used for self-use in the factory or connected to the grid;

[0011] S2. The released steam is condensed into water after heat exchange in the steam-organic working medium Rankine cycle power generation device. The condensed water enters the condensate tank from the condensate outlet of the steam-organic working medium Rankine cycle power generation device. The condensed water in the condensate tank is pumped into the boiler water supply main pipe through the condensate pump. After entering the boiler water supply main pipe, the condensed water enters the steam drum of the built-in large flue waste heat boiler and the built-in large flue waste heat boiler for recycling again;

[0012] S3. After the flue waste heat system is put into normal operation, close the 1# electric valve and 4# electric valve, close the vent pipe, close the 2# electric valve, close the steam branch pipe, and shut down the steam power generation; open the 3# electric valve to allow the steam generated by the built-in flue waste heat boiler to enter the external steam pipe through the 3# electric valve and be sent to the 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 connected to the grid smoothly and the organic working fluid Rankine cycle power generation device cannot work normally, close the 2# electric valve and the 3# electric valve, close the external steam pipeline and the steam branch pipeline, open the 1# electric valve and the 4# electric valve, and the steam generated by the built-in large flue waste heat boiler will be released in a short period of time through the release pipeline.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1) When the waste heat steam from the large flue cannot be connected to the grid, steam power generation is carried out through the steam branch pipeline. The condensed water of the steam after steam power generation enters the built-in large flue waste heat boiler for recycling, effectively avoiding the steam release loss caused by the steam produced by the large flue boiler cannot be connected to the grid normally. The condensed water is reused, the steam is recycled, the steam utilization rate is improved, the system water consumption is saved, the resource loss is saved, the steam release amount is reduced, the noise and environmental pollution are reduced, and the generated electricity can generate considerable economic benefits and improve the utilization value of steam.

[0016] 2) Short-term discharge in the discharge pipe can alleviate the initial instability of steam grid connection of the large flue waste heat system or the inability of the organic working fluid Rankine cycle power generation device to be used normally, prevent damage to the large flue waste heat system and the discharge system, improve the utilization rate of the large flue waste heat system and the discharge system, and improve the steam discharge effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention discloses a flow chart of a steam emission and recovery system of a built-in sintering large flue waste heat boiler.

[0018] In the figure: 1. Built-in large flue waste heat boiler; 2. Built-in large flue waste heat boiler drum; 3. Steam-organic working fluid Rankine cycle power generation device; 4. Condensate tank; 5. Condensate pump; 6. 1# electric valve; 7. 2# electric valve; 8. 3# electric valve; 9. 4# electric valve; 10. Discharge pipe; 11. Steam branch pipe; 12. Boiler feed water main pipe; 13. External steam pipeline. DETAILED DESCRIPTION

[0019] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings:

[0020] like Figure 1As shown, the working principle of the steam release and recovery system of a built-in sintering large flue waste heat boiler is as follows: a steam branch pipe 11 is arranged on the release pipe 10 arranged on the drum 2 of the built-in large flue waste heat boiler, and a steam-organic working fluid Rankine cycle power generation device 3 is arranged on the steam branch pipe 11. When the steam generated by the built-in large flue waste heat boiler 1 cannot be connected to the grid, the steam is transmitted along the steam branch pipe 11 through the steam-organic working fluid Rankine cycle power generation device 3 to generate electricity. The condensate after steam power generation is connected to the boiler water supply main pipe 12 through the condensate tank 4 and the condensate pump 5. The boiler water supply main pipe is connected to the built-in large flue waste heat boiler 1 through the drum 2 of the built-in large flue waste heat boiler, and the condensate generated by the steam is again Recycling, steam recycling, saving resources, reducing energy consumption, saving water resources, improving steam utilization rate, reducing steam emission, reducing noise and environmental pollution, the generated electricity can generate considerable economic benefits, and improve the value of steam utilization. The steam drum 2 of the built-in large flue waste heat boiler is provided with a venting pipe 10. When the organic working fluid Rankine cycle power generation device 3 or the large flue waste heat system is unstable, the venting pipe 10 can be vented in a short period of time to prevent the impact of poor steam emission on the venting system or the large flue waste heat system, and prevent the venting system and the large flue waste heat system from being damaged by steam impact, thereby extending the service life of the venting system and the large flue waste heat system, improving utilization rate, and improving steam venting effect.

[0021] like Figure 1 As shown, a steam release and recovery system of a built-in sintering large flue waste heat boiler comprises a built-in large flue waste heat boiler 1, a built-in large flue waste heat boiler drum 2, a steam organic working medium Rankine cycle power generation device 3, a condensate tank 4, a condensate pump 5, a 1# electric valve 6, a 2# electric valve 7, a 3# electric valve 8 and a 4# electric valve 9, wherein the built-in large flue waste heat boiler 1 is connected to the built-in large flue waste heat boiler drum 2, and the outlet of the built-in large flue waste heat boiler drum 2 is connected to a release pipe 10 and an external steam pipeline 13, the vent pipeline 10 is provided with a 1# electric valve 6, the vent pipeline 10 after the 1# electric valve 6 is provided with a steam branch pipeline 11, the steam branch pipeline 11 is sequentially provided with a 2# electric valve 7 and a steam-organic working fluid Rankine cycle power generation device 3, 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 a boiler feed water main pipe 12 through a condensate pump 5, and a 3# electric valve 8 is provided on the external steam pipeline 13.

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

[0023] Furthermore, the vent pipe 10 is provided with a 4# electric valve 9 after the steam branch pipe 11 .

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

[0025] S1. In the initial stage of operation of the flue waste heat system and when the external steam cannot be smoothly connected to the grid, close the 3# electric valve 8 and the 4# electric valve 9, open the 1# electric valve 6 and the 2# electric valve 7, so that the steam released by the flue boiler can be sent to the steam organic working fluid Rankine cycle power generation device 3 in the steam branch pipeline 11, and the released steam is used to generate electricity. The generated electricity can be used for self-use in the factory or connected to the grid;

[0026] S2. The released steam is condensed into water after being generated by the steam-organic working medium Rankine cycle power generation device 3. The condensed water enters the condensate tank 4 from the condensate outlet of the steam-organic working medium Rankine cycle power generation device 3. The condensed water in the condensate tank 4 is pumped into the boiler feed water main pipe 12 through the condensate pump 5. After entering the boiler feed water main pipe 12, the condensed water enters the built-in large flue waste heat boiler drum 2 and the built-in large flue waste heat boiler 1 for recycling again;

[0027] S3. After the flue waste heat system is put into normal operation, close the 1# electric valve 6 and the 4# electric valve 9, close the vent pipe 10, close the 2# electric valve 7, close the steam branch pipe 11, and shut down the steam power generation; open the 3# electric valve 8, so that the steam generated by the built-in flue waste heat boiler 1 enters the external steam pipe 13 through the 3# electric valve 8, and is sent to the flue waste heat system;

[0028] S4. In the initial stage of operation of the large flue waste heat system and when the external steam cannot be smoothly connected to the grid and the organic working fluid Rankine cycle power generation device 3 cannot work normally, close the 2# electric valve 7 and the 3# electric valve 8, close the external steam pipeline 13 and the steam branch pipeline 11, open the 1# electric valve 6 and the 4# electric valve 9, and the steam generated by the built-in large flue waste heat boiler 1 is released for a short period of time through the release pipeline 10.

[0029] The above description is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A steam emission and recovery system for a built-in sintering large flue waste heat boiler, comprising a built-in large flue waste heat boiler, a built-in large flue waste heat boiler drum, a steam organic working fluid Rankine cycle power generation device, a condensate tank, a condensate pump, a 1# electric valve, a 2# electric valve, a 3# electric valve and a 4# electric valve, wherein the built-in large flue waste heat boiler is connected to the built-in large flue waste heat boiler drum, characterized in that: The outlet of the steam drum of the built-in large flue waste heat boiler is connected to a venting pipe and an external steam pipe. A 1# electric valve is arranged on the venting pipe. A steam branch pipe is arranged on the venting pipe after the 1# electric valve. A 2# electric valve and a steam-organic working fluid Rankine cycle power generation device are arranged in sequence on the steam branch pipe. 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 feed water main pipe through a condensate pump. A 3# electric valve is arranged on the external steam pipe.

2. The steam emission and recovery system of a built-in sintering large flue waste heat boiler according to claim 1 is characterized in that: The built-in sintering large flue waste heat boiler is arranged in the large flue.

3. The steam emission and recovery system of a built-in sintering large flue waste heat boiler according to claim 1 is characterized in that: The release pipeline is provided with a 4# electric valve after the steam branch pipeline.

4. The steam emission and recovery method of the steam emission and recovery system of the built-in sintering large flue waste heat boiler according to claim 1 is characterized in that: The steam release and recovery method of the built-in sintering large flue waste heat boiler includes the following contents: S1. In the initial stage of operation of the flue waste heat system and when the external steam cannot be smoothly connected to the grid, close the 3# electric valve and the 4# electric valve, open the 1# electric valve and the 2# electric valve, so that the steam released by the flue boiler can be sent to the steam organic working fluid Rankine cycle power generation device in the steam branch pipeline, and the released steam can be used to generate electricity. The generated electricity can be used for self-use in the factory or connected to the grid; S2. The released steam is condensed into water after heat exchange in the steam-organic working medium Rankine cycle power generation device. The condensed water enters the condensate tank from the condensate outlet of the steam-organic working medium Rankine cycle power generation device. The condensed water in the condensate tank is pumped into the boiler water supply main pipe through the condensate pump. After entering the boiler water supply main pipe, the condensed water enters the steam drum of the built-in large flue waste heat boiler and the built-in large flue waste heat boiler for recycling again; S3. After the flue waste heat system is put into normal operation, close the 1# electric valve and 4# electric valve, close the vent pipe, close the 2# electric valve, close the steam branch pipe, and shut down the steam power generation; open the 3# electric valve to allow the steam generated by the built-in flue waste heat boiler to enter the external steam pipe through the 3# electric valve and be sent to the 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 connected to the grid smoothly and the organic working fluid Rankine cycle power generation device cannot work normally, close the 2# electric valve and the 3# electric valve, close the external steam pipeline and the steam branch pipeline, open the 1# electric valve and the 4# electric valve, and the steam generated by the built-in large flue waste heat boiler will be released in a short period of time through the release pipeline.

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