Waste heat comprehensive utilization system of waste heat boiler

Abstract

The utility model discloses a comprehensive waste heat utilization system of a waste heat boiler. The comprehensive waste heat utilization system comprises a gas turbine, the waste heat boiler and a generator set, the output end of the gas turbine is connected with a first steam pocket, the output end of the first steam pocket is connected to a waste heat boiler, the waste heat boiler is connected with a second steam pocket, the output end of the second steam pocket is connected with a heat accumulator, the output end of the heat accumulator is connected to a generator set, and the output end of the generator set is sequentially connected with a condenser, a condensate pump, a deaerator and a water feeding pump. The output end of the feed pump is connected with a condensed water inlet pipe; the output end of the bromine cooling machine is connected with a water return pipeline, and the output end of the water return pipeline is connected with a hot water circulating pump; therefore, waste heat can be fully and reasonably consumed and utilized, the problem that a certain waste heat of a waste heat boiler is wasted is solved, the waste heat utilization rate is increased, and the effect of comprehensive utilization of waste heat is achieved.

Description

Technical Field

[0001] The utility model relates to the field of waste heat recovery and utilization technology of waste heat boilers, in particular to a waste heat comprehensive utilization system of waste heat from waste heat boilers. Background Art

[0002] The steel industry is an important basic raw material industry in the national economy. The steel industry consumes a lot of energy every year. In today's society where energy is scarce, special attention should be paid to the rational use of energy and environmental protection. Therefore, reducing energy consumption and reducing environmental pollution are the development direction of the steel industry. Production processes with low energy consumption and low environmental pollution can not only improve the economic benefits of the enterprise itself, but also increase social benefits, giving steel enterprises an advantage in competition. The steel industry has great energy-saving potential. To this end, large domestic and foreign companies have improved their technologies and used flue gas waste heat recovery systems to carry out energy conservation and comprehensive energy utilization. The flue gas waste heat recovery system fully recovers the waste heat resources of the flue gas and converts it into usable steam, taking into account both energy conservation and environmental protection. For example, China Publication No. CN216429703U discloses an AOD furnace flue gas waste heat comprehensive utilization power generation system, which includes an AOD furnace and a generator set; the output end of the AOD furnace is connected to a vaporization flue, the output end of the vaporization flue is connected to a first steam drum, the output end of the first steam drum is connected to a waste heat boiler, the waste heat boiler is connected to a second steam drum, the output end of the second steam drum is connected to a heat accumulator, the output end of the heat accumulator is connected to the generator set, the input end of the first steam drum is connected to a pipe for supplying water, the input end of the pipe is connected to the generator set, and the steam drum is connected to a waste heat boiler. The output end of the flue gas duct is connected to a convection heating surface device, which is used to heat the feed water into steam and then send it into the first steam drum. The feed water enters the convection heating surface device through the first steam drum; although it increases the steam production and power generation, thereby improving the efficiency of utilizing the waste heat of the flue gas discharged from the AOD furnace, achieving the effect of comprehensive utilization of waste heat; however, the condensed water after coming out of the generator set still has waste heat, which causes the waste heat to be dissipated to the outside during the return water circulation, so that the waste heat cannot be fully absorbed, resulting in a certain amount of waste heat waste in the waste heat boiler.

[0003] Therefore, it is necessary to develop a new technology to solve the above problems. Utility Model Content

[0004] In view of this, the utility model aims to solve the deficiencies in the prior art, and its main purpose is to provide a waste heat comprehensive utilization system for a waste heat boiler, which can fully and reasonably absorb and utilize the waste heat, solve the problem of certain waste heat waste in the waste heat boiler, improve the waste heat utilization rate, and achieve the effect of comprehensive utilization of waste heat.

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

[0006] A waste heat comprehensive utilization system of a waste heat boiler, comprising a gas turbine, a waste heat boiler, and a generator set connected in sequence;

[0007] The output end of the gas turbine is connected to a first steam drum, the output end of the first steam drum is connected to a waste heat boiler, the waste heat boiler is connected to a second steam drum, the output end of the second steam drum is connected to a heat accumulator, the output end of the heat accumulator is connected to a generator set, the output end of the generator set is sequentially connected to a condenser, a condensate pump, a deaerator, and a feed water pump, and the output end of the feed water pump is connected to a condensate inlet pipe;

[0008] It also includes a bromide refrigerator and a condensate water heater, wherein the output end of the bromide refrigerator is connected to a return water pipe, the output end of the return water pipe is connected to a hot water circulation pump, the output end of the hot water circulation pump is connected to a circulating water outlet pipe, the circulating water outlet pipe is connected in parallel with a condensate water inlet pipe and then connected to a main pipe, the output end of the main pipe is respectively connected to an inlet pipe and a low-temperature regulating pipe, the output end of the inlet pipe is connected to a condensate water heater, the condensate water heater is connected to an outlet pipe and an intermediate return water pipe, the output end of the outlet pipe is respectively connected to a drum water supply pipe and a high-temperature regulating pipe, the drum water supply pipe is connected to the low-pressure drum water supply pipe of the waste heat boiler, the output ends of the low-temperature regulating pipe, the intermediate return water pipe and the high-temperature regulating pipe are connected in parallel to a bromide refrigerator water supply pipe, and the output end of the bromide refrigerator water supply pipe is connected to the bromide refrigerator.

[0009] As a preferred embodiment, the output end of the gas turbine is connected to a bag-type dust collector, the output end of the bag-type dust collector is connected to an induced draft fan, the output end of the induced draft fan is connected to a chimney, and the chimney is provided with a flue gas online monitoring system for detecting whether the flue gas to be discharged meets the emission standards.

[0010] As a preferred solution, the generator set includes a steam turbine and a generator connected to the steam turbine, the output end of the heat accumulator is connected to the steam turbine, the output end of the steam turbine is connected to the condenser, and the generator is connected to a substation.

[0011] As a preferred solution, the steam turbine is a condensing steam turbine.

[0012] As a preferred solution, the heat accumulator is provided with a temperature sensor.

[0013] As a preferred solution, the output end of the water supply pipe of the bromide refrigerator is connected to a distribution pipeline, a first valve is provided on the distribution pipeline, and the output end of the distribution pipeline is connected to a return water pipeline.

[0014] As a preferred solution, a second valve is provided on the circulating water outlet pipe, and a third valve is provided on the main pipe.

[0015] As a preferred solution, the low-temperature regulating pipe, the intermediate return water pipe and the high-temperature regulating pipe are respectively provided with a fourth valve, a fifth valve and a sixth valve.

[0016] Compared with the prior art, the utility model has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical scheme that it mainly comprises a gas turbine, a waste heat boiler, and a generator set connected in sequence, and is combined with the arrangement of a bromide refrigerator and a condensate heater, so that the output end of the generator set is connected to a condenser, a condensate pump, a deaerator, and a feed water pump in sequence, the output end of the feed water pump is connected to a condensate inlet pipe, and the output end of the bromide refrigerator is connected to a return water pipe, the output end of the return water pipe is connected to a hot water circulation pump, the output end of the hot water circulation pump is connected to a circulating water outlet pipe, and the circulating water The outlet pipe is connected in parallel with the condensate inlet pipe and then connected to a main pipe. The output end of the main pipe is connected to the inlet pipe, and the output end of the inlet pipe is connected to the condensate heater. The output end of the outlet pipe of the condensate heater is connected to the drum water supply pipe, and the drum water supply pipe is connected to the low-pressure drum water supply pipe of the waste heat boiler. In this way, the condensate coming out of the generator set can be recycled and flow into the waste heat boiler after being heated again. In this way, the waste heat can be fully and reasonably absorbed and utilized, which solves the problem of certain waste heat waste in the waste heat boiler, improves the utilization rate of waste heat, and achieves the effect of comprehensive utilization of waste heat.

[0017] In order to more clearly illustrate the structural features, technical means and specific purposes and functions achieved by the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the system structure of an embodiment of the utility model.

[0019] Description of the accompanying drawings:

[0020] 1. Gas turbine 2. Waste heat boiler

[0021] 3. First steam drum 4. Second steam drum

[0022] 5. Regenerator 6. Condenser

[0023] 7. Condensate pump 8. Deaerator

[0024] 9. Water supply pump 10. Condensate inlet pipe

[0025] 11. Bromine refrigeration machine 12. Condensate heater

[0026] 13. Return pipe 14. Hot water circulation pump

[0027] 15. Circulating water outlet pipe 16. Main pipe

[0028] 17. Water inlet pipe 18. Low temperature regulating pipe

[0029] 19. Outlet pipe 20. Middle return pipe

[0030] 21. Steam drum water supply pipe 22. High temperature regulating pipe

[0031] 23. Bromine refrigeration machine water supply pipe 24. Bag type dust collector

[0032] 25. Draft fan 26. Chimney

[0033] 27. Steam turbine 28. Generator

[0034] 29. Substation 30. Distribution pipeline

[0035] 31. First valve 32. Second valve

[0036] 33. The third valve 34. The fourth valve

[0037] 35. Fifth valve 36. Sixth valve. DETAILED DESCRIPTION

[0038] Please refer to Figure 1 As shown, it shows the specific structure of an embodiment of the utility model.

[0039] A waste heat boiler waste heat comprehensive utilization system, comprising a gas turbine 1, a waste heat boiler 2, and a generator set connected in sequence; the output end of the gas turbine 1 is connected to a first steam drum 3, the output end of the first steam drum 3 is connected to the waste heat boiler 2, the waste heat boiler 2 is connected to a second steam drum 4, the output end of the second steam drum 4 is connected to a heat accumulator 5, the output end of the heat accumulator 5 is connected to the generator set, the output end of the generator set is sequentially connected to a condenser 6, a condensate pump 7, a deaerator 8, and a feed pump 9, the output end of the feed pump 9 is connected to a condensate inlet pipe 10; also includes a bromide refrigerator 11 and a condensate heater 12, the output end of the bromide refrigerator 11 is connected to a return pipe 13, the output end of the return pipe 13 is connected to a hot water circulation pump 14, the hot water circulation pump The output end of 14 is connected with a circulating water outlet pipe 15, and the circulating water outlet pipe 15 is connected in parallel with the condensate inlet pipe 10 and then connected to a main pipe 16, and the output end of the main pipe 16 is respectively connected with an inlet pipe 17 and a low-temperature regulating pipe 18, and the output end of the inlet pipe 17 is connected to the condensate heater 12, and the condensate heater 12 is connected with an outlet pipe 19 and an intermediate return pipe 20, and the output end of the outlet pipe 19 is respectively connected with a drum water supply pipe 21 and a high-temperature regulating pipe 22, and the drum water supply pipe 21 is connected to the low-pressure drum water supply pipe 21 of the waste heat boiler 2, and the output ends of the low-temperature regulating pipe 18, the intermediate return pipe 20, and the high-temperature regulating pipe 22 are connected in parallel with a bromide refrigerator water supply pipe 23, and the output end of the bromide refrigerator water supply pipe 23 is connected to the bromide refrigerator 11.

[0040] Preferably, in this embodiment, the output end of the bromide refrigeration machine water supply pipe 23 is connected to a distribution pipe 30, and a first valve 31 is provided on the distribution pipe 30, and the output end of the distribution pipe 30 is connected to the return pipe 13. The circulating water outlet pipe 15 is provided with a second valve 32, and the main pipe 16 is provided with a third valve 33. The low temperature regulating pipe 18, the intermediate return pipe 20, and the high temperature regulating pipe 22 are respectively provided with a fourth valve 34, a fifth valve 35, and a sixth valve 36. In this way, the first valve 31, the second valve 32, the third valve 33, the fourth valve 34, the fifth valve 35, and the sixth valve 36 can be used to control the opening and closing of the corresponding pipelines, and the first valve 31, the second valve 32, the third valve 33, the fourth valve 34, the fifth valve 35, and the sixth valve 36 can all be electric valves or manual valves, which only need to be set according to actual production needs, and no further description is given here.

[0041] Preferably, in this embodiment, the generator set includes a steam turbine 27 and a generator 28 connected to the steam turbine 27, the output end of the heat accumulator 5 is connected to the steam turbine 27, the output end of the steam turbine 27 is connected to the condenser 6, and the generator 28 is connected to a substation 29. The steam turbine 27 is preferably a condensing steam turbine 27, and of course, the steam turbine 27 can also be other steam turbines 27. The generator 28 is a static excitation generator 28.

[0042] Preferably, in this embodiment, the heat accumulator 5 is provided with a temperature sensor. Thus, by providing the temperature sensor, the temperature inside the heat accumulator 5 can be monitored in real time.

[0043] And, in this embodiment, the output end of the gas turbine 1 is connected to a bag filter 24, the output end of the bag filter 24 is connected to an induced draft fan 25, and the output end of the induced draft fan 25 is connected to a chimney 26. The chimney 26 is provided with a flue gas online monitoring system for detecting whether the flue gas to be discharged meets the emission standards, and the components and the content of each component of the flue gas to be discharged in the chimney 26 are monitored. The flue gas online monitoring system can adopt the flue gas emission continuous monitoring system (Continuous Emission Monitoring System, CEMS) in the prior art, which is a device that continuously monitors the concentration and total amount of gaseous pollutants and particulate matter emitted by air pollution sources and transmits the information to the display screen and the competent department in real time.

[0044] In addition, in this embodiment, the chimney 26 has a chimney 26 opening forming an exhaust gas outlet, and the exhaust gas outlet is connected to an exhaust pipe. The exhaust pipe has an exhaust port facing downward. Here, the exhaust pipe has an exhaust port facing downward, which can prevent rain and snow from entering the chimney 26 from the exhaust port and affecting the smooth exhaust of the chimney 26.

[0045] In summary, the design focus of the utility model is that it mainly includes a gas turbine, a waste heat boiler, and a generator set connected in sequence, and is combined with the arrangement of a bromide refrigerator and a condensate heater, so that the output end of the generator set is connected to a condenser, a condensate pump, a deaerator, and a feed water pump in sequence, the output end of the feed water pump is connected to a condensate inlet pipe, and the output end of the bromide refrigerator is connected to a return pipe, the output end of the return pipe is connected to a hot water circulation pump, the output end of the hot water circulation pump is connected to a circulating water outlet pipe, and the circulating water outlet pipe is connected to the condensate inlet pipe. After the connection, it is connected to a main pipe, the output end of the main pipe is connected to a water inlet pipe, the output end of the water inlet pipe is connected to the condensate heater, the output end of the water outlet pipe of the condensate heater is connected to a steam drum water supply pipe, and the steam drum water supply pipe is connected to the low-pressure steam drum water supply pipe of the waste heat boiler. In this way, the condensate coming out of the generator set can be recycled and flow into the waste heat boiler after being heated again. In this way, the waste heat can be fully and reasonably absorbed and utilized, which solves the problem of certain waste heat waste in the waste heat boiler, improves the waste heat utilization rate, and achieves the effect of comprehensive utilization of waste heat.

[0046] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A waste heat comprehensive utilization system of a waste heat boiler, comprising a gas turbine, a waste heat boiler, and a generator set connected in sequence; characterized in that: The output end of the gas turbine is connected to a first steam drum, the output end of the first steam drum is connected to a waste heat boiler, the waste heat boiler is connected to a second steam drum, the output end of the second steam drum is connected to a heat accumulator, the output end of the heat accumulator is connected to a generator set, the output end of the generator set is sequentially connected to a condenser, a condensate pump, a deaerator, and a feed water pump, and the output end of the feed water pump is connected to a condensate inlet pipe; It also includes a bromide refrigerator and a condensate water heater, wherein the output end of the bromide refrigerator is connected to a return water pipe, the output end of the return water pipe is connected to a hot water circulation pump, the output end of the hot water circulation pump is connected to a circulating water outlet pipe, the circulating water outlet pipe is connected in parallel with a condensate water inlet pipe and then connected to a main pipe, the output end of the main pipe is respectively connected to an inlet pipe and a low-temperature regulating pipe, the output end of the inlet pipe is connected to a condensate water heater, the condensate water heater is connected to an outlet pipe and an intermediate return water pipe, the output end of the outlet pipe is respectively connected to a drum water supply pipe and a high-temperature regulating pipe, the drum water supply pipe is connected to the low-pressure drum water supply pipe of the waste heat boiler, the output ends of the low-temperature regulating pipe, the intermediate return water pipe and the high-temperature regulating pipe are connected in parallel to a bromide refrigerator water supply pipe, and the output end of the bromide refrigerator water supply pipe is connected to the bromide refrigerator.

2. A waste heat comprehensive utilization system of a waste heat boiler according to claim 1, characterized in that: The output end of the gas turbine is connected to a bag filter, the output end of the bag filter is connected to an induced draft fan, the output end of the induced draft fan is connected to a chimney, and the chimney is provided with a flue gas online monitoring system for detecting whether the flue gas to be discharged meets the emission standards.

3. The waste heat comprehensive utilization system of a waste heat boiler according to claim 1, characterized in that: The generator set includes a steam turbine and a generator connected to the steam turbine. The output end of the heat accumulator is connected to the steam turbine. The output end of the steam turbine is connected to a condenser. The generator is connected to a substation.

4. A waste heat comprehensive utilization system of a waste heat boiler according to claim 3, characterized in that: The steam turbine is a condensing steam turbine.

5. The waste heat comprehensive utilization system of a waste heat boiler according to claim 1, characterized in that: The heat accumulator is provided with a temperature sensor.

6. The waste heat comprehensive utilization system of a waste heat boiler according to claim 1, characterized in that: The output end of the bromide refrigerator water supply pipe is connected to a distribution pipeline, a first valve is arranged on the distribution pipeline, and the output end of the distribution pipeline is connected to a return water pipeline.

7. The waste heat comprehensive utilization system of a waste heat boiler according to claim 1, characterized in that: The circulating water outlet pipe is provided with a second valve, and the main pipe is provided with a third valve.

8. The waste heat comprehensive utilization system of a waste heat boiler according to claim 1, characterized in that: The low temperature regulating pipe, the middle water return pipe and the high temperature regulating pipe are respectively provided with a fourth valve, a fifth valve and a sixth valve.

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