System for recovering waste heat and working medium of diffused steam of dry quenching boiler

Abstract

The utility model relates to a system for recovering waste heat and working media of diffused steam of a coke dry quenching boiler, which comprises the coke dry quenching boiler, a main steam pipeline, a steam turbine generator unit, a high-pressure dead steam waste heat utilization pipeline, high-temperature dead steam temperature and pressure reduction equipment, a low-pressure steam pipe network, a self-deoxidizing system and a recycling system, the dry quenching boiler is connected with the steam turbine generator unit through a main steam pipeline, a high-pressure dead steam waste heat utilization pipeline is arranged on the main steam pipeline, and high-temperature dead steam temperature and pressure reduction equipment is arranged on the high-pressure dead steam waste heat utilization pipeline. The high-temperature dead steam temperature and pressure reduction device has the advantages that the problem of energy waste caused by steam diffusion is solved, production cost is reduced, white smoke elimination is achieved, the environmental protection requirement is met, practicability is high, the application range is wide, and economic value is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to dry quenching waste heat recycling technical field especially relates to a system of recycling dry quenching boiler diffusion steam waste heat and working medium. BACKGROUND

[0002] Dry quenching waste heat power generation technology is to use dry quenching boiler to absorb the heat of circulating gas to produce steam, and to supply steam turbine generator to generate electricity. In recent years, dry quenching waste heat power generation technology develops rapidly and is widely used in steel coking industry. At the initial stage of dry quenching production, dry quenching boiler is often put into operation, but steam turbine generator is not put into operation. Under this condition, dry quenching boiler is generally in low load operation state of 10% to 30%, and produces overheat steam of about 5.0MPa and 450℃ to 500℃. At this time, the steam produced by dry quenching boiler is diffused through the main steam diffusion pipeline through the silencer, which causes waste of energy and produces "white smoke", which is not conducive to environmental protection.

[0003] Therefore, it is necessary to recycle and reuse the diffusion steam produced by dry quenching boiler, which can solve the problem of energy waste and meet the environmental protection requirements. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, the utility model provides a system of recycling dry quenching boiler diffusion steam waste heat and working medium, which sends the diffusion steam produced by dry quenching boiler to three places after temperature reduction and pressure reduction, one is to be integrated into low pressure steam pipe network, two is to be sent into its own deoxygenation system, and three is to recycle and reuse working medium through low temperature temperature reduction and pressure reduction equipment and exhaust steam condensing equipment.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A system of recycling dry quenching boiler diffusion steam waste heat and working medium, comprising dry quenching boiler, main steam pipeline, steam turbine generator unit, high pressure exhaust steam waste heat utilization pipeline, high temperature exhaust steam temperature reduction and pressure reduction equipment, low pressure steam pipe network, its own deoxygenation system and recycling and reusing system, the dry quenching boiler is connected with the steam turbine generator unit through the main steam pipeline, the high pressure exhaust steam waste heat utilization pipeline is arranged on the main steam pipeline, the high pressure exhaust steam waste heat utilization pipeline is connected with the high temperature exhaust steam temperature reduction and pressure reduction equipment, and the high temperature exhaust steam temperature reduction and pressure reduction equipment is connected with the low pressure steam pipe network, its own deoxygenation system and recycling and reusing system respectively.

[0007] Furthermore, the recycling system includes a low-temperature desuperheating and pressure reducing device, a waste steam condensing device, a demineralized water tank, and a desuperheating water pump. The outlet of the high-pressure waste steam desuperheating and pressure reducing device is connected to the inlet of the low-temperature desuperheating and pressure reducing device via a 0.6MPa low-pressure steam pipeline. The outlet of the low-temperature desuperheating and pressure reducing device is connected to the inlet of the waste steam condensing device via a 0.02MPa ultra-low-pressure steam pipeline. The outlet of the waste steam condensing device is connected to the inlet of the demineralized water tank via a condensate recovery pipeline. The outlet of the demineralized water tank is connected to a desuperheating water pipeline. A desuperheating water pump is installed on the desuperheating water pipeline. The desuperheating water pipeline on the outlet side of the desuperheating water pump is divided into two lines, which are respectively connected to the high-temperature waste steam desuperheating and pressure reducing device and the low-temperature desuperheating and pressure reducing device.

[0008] Furthermore, the self-deoxygenation system includes a deaerator, and the deaerator inlet is provided with a low-pressure deaerator pipeline connected to a high-temperature exhaust steam desuperheating and pressure reducing device.

[0009] Furthermore, a main steam venting pipeline is installed at the outlet of the dry quenching coke boiler, and a silencer and an electric valve are installed on the main steam venting pipeline.

[0010] Furthermore, the high-pressure exhaust steam waste heat utilization pipeline is equipped with a desuperheating and pressure reducing valve, a remote temperature control instrument, and a remote pressure control instrument.

[0011] Furthermore, the two desuperheating water pipelines are respectively equipped with a shut-off valve, a filter, a throttle valve, a water supply regulating valve, and a check valve, and the opening degree of the water supply regulating valve is controlled by a remote temperature control instrument.

[0012] Furthermore, the aforementioned waste steam condensing equipment is equipped with a vacuum pipeline connected to a water ring vacuum pump.

[0013] Furthermore, the exhaust steam condensing equipment is connected to the circulating cooling water supply and the circulating cooling water return.

[0014] Furthermore, the demineralized water tank is connected to a demineralized water replenishment pipeline.

[0015] Furthermore, a pressure-controlled regulating valve is installed between the high-pressure exhaust steam waste heat utilization pipeline and the low-pressure steam pipeline network.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. The steam generated by the dry quenching coke boiler, which would normally be released through the main steam venting pipeline and silencer, is sent to three places: first, it is connected to the low-pressure steam network; second, it is sent to its own deoxygenation system; and third, the working fluid is recovered and reused through low-temperature desuperheating and pressure reducing equipment and waste steam condensing equipment. This not only solves the problem of energy waste caused by steam release and reduces production costs, but also achieves "whitening" and meets environmental protection requirements.

[0018] 2. The pressure control regulating valve installed between the high-pressure exhaust steam waste heat utilization pipeline and the low-pressure steam pipeline network can meet the application of this system under different working conditions, provide different low-pressure steam quantities for different routes, meet the personalized needs of actual projects, and has strong practicality, wide applicability, and high economic value. Attached Figure Description

[0019] Figure 1 This utility model presents a system process flow diagram for recovering waste heat and working fluid from steam released from a dry quenching coke boiler.

[0020] In the diagram: 1. Dry quenching coke boiler; 2. Main steam pipeline; 3. Steam turbine generator set; 4. Main steam venting pipeline; 5. Silencer; 6. High-pressure waste steam waste heat utilization pipeline; 7. High-temperature waste steam desuperheating and pressure reduction equipment; 8. 0.6MPa low-pressure steam pipeline; 9. Deaerator; 10. Low-temperature desuperheating and pressure reduction equipment; 11. 0.02MPa ultra-low-pressure steam pipeline; 12. Waste steam condensing equipment; 13. Circulating cooling water supply pipeline; 14. Circulating cooling water return pipeline; 15. Condensate recovery pipeline; 16. Demineralized water tank; 17. Desuperheating water pump; 18. Desuperheating water pipeline; 19. Demineralized water makeup pipeline; 20. Water ring vacuum pump equipment; 21. Vacuum pumping pipeline. Detailed Implementation

[0021] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings:

[0022] like Figure 1 As shown, a system for recovering waste heat and working fluid from vented steam in a dry quenching coke boiler includes a dry quenching boiler 1, a main steam pipeline 2, a steam turbine generator set 3, a high-pressure waste steam heat utilization pipeline 6, a high-temperature waste steam desuperheating and pressure reducing device 7, a low-pressure steam network, a self-deaeration system, and a recovery and reuse system. The dry quenching boiler 1 is connected to the steam turbine generator set 3 via the main steam pipeline 2. The high-pressure waste steam heat utilization pipeline 6 is installed on the main steam pipeline 2. The high-pressure waste steam heat utilization pipeline 6 is connected to the high-temperature waste steam desuperheating and pressure reducing device 7. The high-temperature waste steam desuperheating and pressure reducing device 7 is connected to the low-pressure steam network, the self-deaeration system, and the recovery and reuse system. In the initial stage of coke quenching production, the 5.0MPa, 450-500℃ vented steam generated by the dry quenching boiler 1 is released through the main steam venting pipeline 4 and silencer 5. Electric valves are installed on the high-pressure waste steam heat utilization pipeline 6, the main steam venting pipeline 4 and the main steam pipeline 2 to switch the vented steam. The vented steam can be sent to the high-temperature waste steam desuperheating and pressure reducing equipment 7 through the high-pressure waste steam heat utilization pipeline 6 via the electric valve control. The generated low-pressure steam can be sent to three places: first, it can be connected to the low-pressure steam network; second, it can be used for its own deoxygenation system; and third, the working fluid can be recovered and reused through the low-temperature desuperheating and pressure reducing equipment 10 and the waste steam condensing equipment 12.

[0023] Further, the recycling system comprises a low-temperature desuperheating and pressure-reducing device 10, a steam condensing device 12, a desalted water tank 16 and a desuperheating water pump 17. The outlet of the high-pressure steam desuperheating and pressure-reducing device 7 is connected to the inlet of the low-temperature desuperheating and pressure-reducing device 10 through a 0.6 MPa low-pressure steam pipeline 8. The outlet of the low-temperature desuperheating and pressure-reducing device 10 is connected to the inlet of the steam condensing device 12 through a 0.02 MPa ultra-low-pressure steam pipeline 11. The outlet of the steam condensing device 12 is connected to the inlet of the desalted water tank 16 through a condensate water recovery pipeline 15. The outlet of the desalted water tank 16 is connected to the desuperheating water pipeline 18. The desuperheating water pipeline 18 is provided with the desuperheating water pump 17. The desuperheating water pipeline 18 on the outlet side of the desuperheating water pump 17 is divided into two branches. The two branches of the desuperheating water pipeline 18 are connected to the high-temperature steam desuperheating and pressure-reducing device 7 and the low-temperature desuperheating and pressure-reducing device 10, respectively. The two branches of the desuperheating water pipeline 18 provide desuperheating water for the high-temperature steam desuperheating and pressure-reducing device 7 and the low-temperature desuperheating and pressure-reducing device 10.

[0024] Further, the oxygen removal system comprises an oxygen remover 9. The inlet of the oxygen remover 9 is connected to the high-temperature steam desuperheating and pressure-reducing device 7 through a low-pressure oxygen removal pipeline.

[0025] Further, the main steam pipeline 2 is provided with a main steam release pipeline 4 at the outlet of the dry quenching boiler 1. The main steam release pipeline 4 is provided with a silencer 5 and an electric valve.

[0026] Further, the high-pressure steam waste heat utilization pipeline 6 is provided with a desuperheating and pressure-reducing valve, a remote temperature control instrument and a remote pressure control instrument for controlling the temperature and pressure of the low-pressure steam at the outlet of the high-temperature steam desuperheating and pressure-reducing device 7.

[0027] Further, the two branches of the desuperheating water pipeline 18 are provided with a stop valve, a filter, a throttle valve, a feed water regulating valve and a check valve in sequence. The opening degree of the feed water regulating valve is controlled by a remote temperature control instrument.

[0028] Further, the steam condensing device 12 is connected to a water ring vacuum pump device 20 through a vacuum pipeline 21. The water ring vacuum pump device 20 provides vacuum for the steam condensing device 12.

[0029] Further, the steam condensing device 12 is connected to a circulating cooling water supply 13 and a circulating cooling water return 14.

[0030] Further, the desalted water tank 16 is connected to a desalted water supplement pipeline 19.

[0031] Further, the high-pressure steam waste heat utilization pipeline 6 is provided with a pressure control regulating valve between the high-pressure steam waste heat utilization pipeline 6 and the low-pressure steam pipeline network.

[0032] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art, according to the technical scheme and concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, all should be covered in the protection scope of the present application.

Claims

1. A system for recycling dry quenching boiler emission steam waste heat and working medium, comprising a dry quenching boiler, a main steam pipeline, a steam turbine generator unit, a high-pressure exhaust steam waste heat utilization pipeline, a high-temperature exhaust steam temperature and pressure reducing device, a low-pressure steam pipeline network, a self deoxidization system and a recycling system, the dry quenching boiler is connected to the steam turbine generator unit through the main steam pipeline, characterized in that, The high-pressure waste steam residual heat utilization pipeline is connected with a high-temperature waste steam temperature and pressure reducing device, and the high-temperature waste steam temperature and pressure reducing device is respectively connected with a low-pressure steam pipeline network, a self deaerating system and a recycling system.

2. The system for recovering exhaust steam waste heat and working medium of a dry quenching boiler according to claim 1, characterized in that, The recycling system comprises a low-temperature temperature and pressure reducing device, a waste steam condensing device, a desalted water tank and a desalted water pump, the 0.6MPa low-pressure steam pipeline connected with the gas outlet of the high-pressure waste steam temperature and pressure reducing device is connected with the gas inlet of the low-temperature temperature and pressure reducing device, the 0.02MPa ultra-low-pressure steam pipeline connected with the gas outlet of the low-temperature temperature and pressure reducing device is connected with the gas inlet of the waste steam condensing device, the water outlet of the waste steam condensing device is connected with the water inlet of the desalted water tank through a condensate water recycling pipeline, the water outlet of the desalted water tank is provided with a desalted water pipeline, the desalted water pipeline is provided with a desalted water pump, and the desalted water pipeline on the outlet side of the desalted water pump is divided into two branches, and the two branches of the desalted water pipeline are respectively connected with the high-temperature waste steam temperature and pressure reducing device and the low-temperature temperature and pressure reducing device.

3. The system for recovering exhaust steam waste heat and working medium of a dry quenching boiler according to claim 1, characterized in that, The self deaerating system comprises a deaerating device, and the inlet of the deaerating device is provided with a low-pressure deaerating pipeline connected with the high-temperature waste steam temperature and pressure reducing device.

4. The system for recovering exhaust steam waste heat and working medium of a dry quenching boiler according to claim 1, characterized in that, The main steam pipeline is provided with a main steam diffusion pipeline at the outlet position of the dry quenching boiler, and the main steam diffusion pipeline is provided with a silencer and an electric valve.

5. The system for recovering exhaust steam waste heat and working medium of a dry quenching boiler according to claim 1, characterized in that, The high-pressure waste steam residual heat utilization pipeline is provided with a temperature and pressure reducing valve, a remote temperature control instrument and a remote pressure control instrument.

6. The system for recovering exhaust steam waste heat and working medium of a dry quenching boiler according to claim 2, characterized in that, The two branches of the desalted water pipeline are respectively provided with a stop valve, a filter, a throttle valve, a feed water regulating valve and a check valve in sequence, and the feed water regulating valve is controlled in opening degree by the remote temperature control instrument.

7. The system for recovering exhaust steam waste heat and working medium of a dry quenching boiler according to claim 2, characterized in that, The waste steam condensing device is provided with a vacuum pipeline connected with a water ring vacuum pump device.

8. The system for recovering exhaust steam waste heat and working medium of a dry quenching boiler according to claim 2, characterized in that, The waste steam condensing device is connected with circulating cooling water supply and circulating cooling water return.

9. The system for recovering exhaust steam waste heat and working medium of a dry quenching boiler according to claim 2, characterized in that, The desalted water tank is externally connected with a desalted water supplement pipeline.

10. The system for recovering exhaust steam waste heat and working medium of a dry quenching boiler according to claim 1, characterized in that, The high-pressure waste steam residual heat utilization pipeline and the low-pressure steam pipeline network are provided with a pressure control regulating valve.

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